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Relevant bibliographies by topics / Respiratory imaging / Dissertations / Theses

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Dissertations / Theses on the topic 'Respiratory imaging'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Boucneau, Tanguy. "Magnetic resonance imaging of respiratory mechanics." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS165.

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La fonction respiratoire chez l'homme est indissociable du mouvement de déformation du poumon : les échanges gazeux entre l'organisme et son environnement sont rendus possibles, lors de l'inspiration, par le gonflement des alvéoles du parenchyme pulmonaire, et lors de l'expiration, par un retour passif à l'état d'équilibre statique du poumon. Les propriétés viscoélastiques des tissus pulmonaires jouent un rôle clé dans la fonction même de cet organe. Ces éléments de la mécanique respiratoire pourraient être des biomarqueurs très sensibles de l'état physiopathologique du poumon puisqu'ils dépen

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2

Schleyer, Paul. "Respiratory motion correction in PET/CT imaging." Thesis, King's College London (University of London), 2012. https://kclpure.kcl.ac.uk/portal/en/theses/respiratory-motion-correction-in-petct-imaging(001f09fd-b405-4cbf-9ff7-9ba6541f3dab).html.

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In dual modality PET-CT imaging, respiratory motion can introduce blurring in PET images and create a spatial mismatch between the PET and CT datasets. Attenuation correction errors can result from this mismatch, which can produce severe artefacts that potentially alter the clinical interpretation of the images. Various approaches of reducing these effects have been developed. Many involve respiratory gated acquisitions which generally require a measure of the respiratory cycle throughout imaging. In this work, a retrospective respiratory gating technique was devel¬oped for both PET and CT whi

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3

Fry, Michael W. "Multiphase assessment of respiratory function." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1596462.

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<p> The emergence of more sophisticated full body plethysmograph systems has occurred over recent years and called for broader testing of respiratory functions. Specific airway resistance and intrathoracic gas volume or functional residual capacity can provide more accurate measure of lung function utilizing a computerized full body plethysmograph. Clinics or specialized test facilities today could use this type of system for testing, evaluation, and long term monitoring of patients suspected of suffering from pulmonary disease of which there is no cure. A virtual machine was used for pulmo

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4

Baumgartner, Christian. "Manifold alignment for imaging and modelling respiratory motion." Thesis, King's College London (University of London), 2016. https://kclpure.kcl.ac.uk/portal/en/theses/manifold-alignment-for-imaging-and-modelling-respiratory-motion(a20491dc-7894-485b-a833-57fa57d62e2a).html.

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Respiratory motion a ects a wide range of techniques in the eld of medical image acquisition and analysis. In image-guided interventions it may cause misalignment of static road maps with the patient's anatomy. In imaging such as magnetic resonance (MR) imaging or positron emission tomography (PET) it may cause the images to appear blurred which may impede disease diagnosis and staging. Manifold learning is a powerful tool for the non-linear dimensionality reduction of imaging data, which can be used to uncover the data's dominating sources of motion. By aligning low-dimensional embeddings of

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5

Lidegran, Marika. "Advanced radiological imaging in patients treated with extracorporeal membrane oxygenation /." Stockholm, 2006. http://diss.kib.ki.se/2006/91-7140-933-5/.

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6

Craven, Thomas Henry John. "Resolving uncertainty in acute respiratory illness using optical molecular imaging." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/29507.

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Ventilator associated pneumonia (VAP) and acute respiratory distress syndrome (ARDS) are two respiratory conditions unique to mechanically ventilated patients. The diagnosis of these conditions, and therefore any subsequent treatment, are befuddled by uncertainty. VAP rates vary considerably according to the diagnostic or surveillance criteria used. The pathogenesis of ARDS is well understood but when the internationally agreed consensus criteria are employed, the histological hallmarks are absent about half the time, indicating a disconnection between the clinical diagnosis and what is known

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7

Ooi, Gaik Cheng, and 黃玉清. "Role of imaging in evaluation of lung involvement in severe acute respiratory syndrome (SARS)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B47468713.

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Diagnostic imaging played a substantial role in the management and treatment of patients during the Severe Acute Respiratory Syndrome (SARS) outbreak when daily chest radiographs were performed as a measure of disease severity and respiratory status. This thesis was performed to address several issues relating to the radiological spectrum of SARS, its temporal pattern on chest radiograph and high resolution computed tomography (HRCT) during the course of disease, and relationships between severity of opacities quantified on chest radiographs and clinical parameters including treatment

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8

Scott-Jackson, William. "Marker-less respiratory gating for PET imaging with intelligent gate optimisation." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/849418/.

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PET image degradation imposed by patient respiratory motion is a well-established problem in clinical oncology; strategies exist to study and correct this. Some attempt to minimise or arrest patient motion through restraining hardware; their effectiveness is subject to the comfort and compliance. Another practice is to gate PET data based on signals acquired from an external device. This thesis presents several contributions to the field of respiratory motion correction research in PET imaging. First and foremost, this thesis presents a framework which allows a researcher to process list mode

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9

Fayad, Hadi. "Respiratory motion modeling for use in diagnostic imaging and radiation therapy." Brest, 2011. http://www.theses.fr/2011BRES2058.

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Les déformations associées au mouvement respiratoire sont l’un des paramètres principaux réduisant la sensibilité et la spécificité au niveau thoracique et abdominal. En outre, le mouvement respiratoire diminue la précision dans la fusion d’images acquises en utilisant un système combiné tomographie à émission de positron / tomodensitométrie (TEP/TDM). Les solutions existantes à jour incluent l’acquisition des images TDM et TEP synchronisées avec la respiration. Cependant, les différences entre l'acquisition 4D TEP et 4D TDM, dues aux conditions de respiration différentes pour ces deux modalit

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10

Lenk, Mary Claire. "Respiratory Motion Tracking in Magnetic Resonance Imaging with Pilot Tone Technology." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531838630931375.

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11

Lilburn, D. M. L. "Hyperpolarized noble gas magnetic resonance imaging of the ex vivo rodent lung." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/28827/.

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The work described within this thesis was conducted at the University of Nottingham between April 2011 and March 2014. Due to the inter-disciplinary nature of this work it was undertaken by the author in conjunction with the other scientists in the Translational Imaging group at the Sir Peter Mansfield Magnetic Resonance Centre, University of Nottingham and collaborators in both the Pulmonary Biology group, University of Nottingham and the Respiratory Pharmacology group, Imperial College London. Pulmonary hyperpolarized (hp) noble gas magnetic resonance imaging (MRI) has seen increasing develo

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12

Henderson, Cortney Erik. "Magnetic Resonance Imaging of the Normal Equine Larynx." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/33833.

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A study was performed to establish the appearance of normal equine laryngeal cartilages using magnetic resonance imaging. Specimens were acquired from clinically normal horses that were euthanized for reasons other than respiratory disease. Three in situ and 5 ex vivo larynges were imaged using a 0.3 Tesla system. Images were obtained in the transverse plane using T1-weighted 3D spin echo, T2-weighted 3D spin echo, T2-weighted gradient echo, short tau inversion recovery (STIR), and proton density spin echo sequences. Five ex vivo larynges were also imaged in the transverse plane using a 1.

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13

Lindbäck, Elias. ""Imaging with CBCT and 4D-CT of objects moving with respiratory motions"." Thesis, Stockholms universitet, Medicinsk strålningsfysik (tills m KI), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-89053.

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AB S TRACT purpose : To further investigate the effects of respiratory motions on CBCT imaging, as well as 4D-CT examinations, with a future goal of using obtained results to implement new methods for individual margins and daily matching procedures into routine clinical practice. background : Since the implementation of CBCT combined with modern accelerators, a higher degree of accuracy has been made possible in RT. However, due to the slow gantry speed of linear accelerators, the imaging procedure of CBCT is a slow process which is thereby degraded by internal motion such as respiration. mat

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14

Hellström, Karlsson Rebecca, and Tobias Peterson. "Extracting Cardiac and Respiratory Self-Gating Signals from Magnetic Resonance Imaging Data." Thesis, KTH, Skolan för teknik och hälsa (STH), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171570.

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Motion artefacts due to cardiac and respiratory motion present a daily challenge in cardiac Magnetic Resonance Imaging (MRI), and many different motion correction procedures are used in clinical routine imaging. To reduce motion artefacts further, patients are required to hold their breath during parts of the data acquisition, which is physically straining – especially when done repetitively. Self-Gating (SG) is a method that extracts cardiac and respiratory motion information from the MRI data in the form of signals, called SG signals, and uses them to divide the data into the specific cardia

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15

Arvanitis, Theodoros N. "A study of respiratory motion artifacts in magnetic resonance imaging and spectroscopy." Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320361.

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16

Scott, Andrew David. "Magnetic resonance coronary vessel wall imaging with highly efficient respiratory motion correction." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6978.

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There is a need for a noninvasive imaging technique for use in longitudinal studies of sub-clinical coronary artery disease. Magnetic resonance (MR) can be used to selectively and non-invasively image the coronary wall without the use of ionising radiation. However, high-resolution 3D studies are often time consuming and unreliable, as data acquisition is generally gated to a small window of diaphragm positions around end-expiration which results in inherently poor and variable respiratory efficiency. This thesis describes the development and application of a novel technique (beat-to-beat resp

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17

Melchor, Rodríguez Angel. "Contributions to heart rate variability and respiratory rate analysis through video imaging techniques." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/665983.

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The present doctoral thesis proposes a series of methods that have as a general objective the non-contact evaluation of heart rate variability (HRV) and respiratory rate (BR) through video imaging. The proposal of this technique has emerged in the last few years as an alternative to the traditional measurement systems, which assess these and other physiological parameters through direct contact with the person’s body. Due to this condition, the traditional systems may cause some complications in people who present a sensitive or fragile skin, such as neonates or patients with burn injuries. F

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18

Flinders, Bryn. "The use of MALDI-MS for imaging drug disposition in respiratory disease models." Thesis, Sheffield Hallam University, 2013. http://shura.shu.ac.uk/19652/.

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Matrix-assisted laser desorption/ionisation-mass spectrometry imaging (MALDI-MSI) has been extensively applied to monitoring the distribution of pharmaceutical compounds in tissues. The main aim of the work reported in this thesis is to monitor the distribution of respiratory compounds in the lungs following inhaled delivery. Glucocorticoids that contain multiple carbonyl functionalities are not easily protonated/de-protonated to form charged species due to the poor ionisation efficiencies of the carbonyl functionalities. Derivatisation with hydrazine based reagents has been proposed as a solu

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19

Wang, Jiali. "Motion Correction Algorithm of Lung Tumors for Respiratory Gated PET Images." FIU Digital Commons, 2009. http://digitalcommons.fiu.edu/etd/96.

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Respiratory gating in lung PET imaging to compensate for respiratory motion artifacts is a current research issue with broad potential impact on quantitation, diagnosis and clinical management of lung tumors. However, PET images collected at discrete bins can be significantly affected by noise as there are lower activity counts in each gated bin unless the total PET acquisition time is prolonged, so that gating methods should be combined with imaging-based motion correction and registration methods. The aim of this study was to develop and validate a fast and practical solution to the problem

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20

Dasari, Paul Krupaker Reddy. "Characterization and Compensation of Hysteretic Cardiac Respiratory Motion in Myocardial Perfusion Studies Through MRI Investigations." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-dissertations/159.

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Respiratory motion causes artifacts and blurring of cardiac structures in reconstructed images of SPECT and PET cardiac studies. Hysteresis in respiratory motion causes the organs to move in distinct paths during inspiration and expiration. Current respiratory motion correction methods use a signal generated by tracking the motion of the abdomen during respiration to bin list- mode data as a function of the magnitude of this respiratory signal. They thereby fail to account for hysteretic motion. The goal of this research was to demonstrate the effects of hysteretic respiratory motion and the i

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21

Piccini, Davide [Verfasser], Joachim [Akademischer Betreuer] Hornegger, and Matthias [Akademischer Betreuer] Stuber. "Respiratory Self-Navigation for Whole-Heart Coronary Magnetic Resonance Imaging / Davide Piccini. Gutachter: Joachim Hornegger ; Matthias Stuber." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2014. http://d-nb.info/1064996965/34.

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22

Gunatilaka, Chamindu C. "Neonatal Airway Analysis Using Magnetic Resonance Imaging and Computational Fluid Dynamics." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1623165127485093.

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23

Doel, Thomas MacArthur Winter. "Developing clinical measures of lung function in COPD patients using medical imaging and computational modelling." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:34bbf6fd-ea01-42a2-8e99-d1e4a3c765b7.

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Chronic obstructive pulmonary disease (COPD) describes a range of lung conditions including emphysema, chronic bronchitis and small airways disease. While COPD is a major cause of death and debilitating illness, current clinical assessment methods are inadequate: they are a poor predictor of patient outcome and insensitive to mild disease. A new imaging technology, hyperpolarised xenon MRI, offers the hope of improved diagnostic techniques, based on regional measurements using functional imaging. There is a need for quantitative analysis techniques to assist in the interpretation of these imag

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Armstrong, Julian. "Anatomical optical coherence tomography in the human upper airway /." Connect to this title, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0022.

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Hamlet, Sean Michael. "PROPERTIES AND OPTIMIZATION OF RESPIRATORY NAVIGATOR GATING FOR SPIRAL CINE DENSE CARDIAC MRI." UKnowledge, 2017. http://uknowledge.uky.edu/ece_etds/106.

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Cardiac magnetic resonance (MR) imaging can non-invasively assess heart function. Displacement encoding with stimulated echoes (DENSE) is an advanced cardiac MR imaging technique that measures tissue displacement and can be used to quantify cardiac mechanics (e.g. strain and torsion). When combined with clinical risk factors, cardiac mechanics have been shown to be better predictors of mortality than traditional measures of heart function. End-expiratory breath-holds are typically used to minimize respiratory motion artifacts. Unfortunately, requiring subjects to breath-hold introduces limitat

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Chakraborty, Chandrani. "Quantification of respiratory motion in PET/CT and its significance in radiation therapy." Oklahoma City : [s.n.], 2008.

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27

Sanders, James [Verfasser], Andreas [Akademischer Betreuer] Maier, Andreas [Gutachter] Maier, Michael [Gutachter] King, and Torsten [Gutachter] Kuwert. "Methods for Quantification and Respiratory Motion Management in SPECT Imaging / James Sanders ; Gutachter: Andreas Maier, Michael King, Torsten Kuwert ; Betreuer: Andreas Maier." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2020. http://d-nb.info/1206734116/34.

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28

Wasza, Jakob [Verfasser], Joachim [Akademischer Betreuer] Hornegger, Joachim [Gutachter] Hornegger, Paul [Gutachter] Keall, and Joachim [Gutachter] Denzler. "Real-time Respiratory Motion Analysis Using GPU-accelerated Range Imaging / Jakob Wasza ; Gutachter: Joachim Hornegger, Paul Keall, Joachim Denzler ; Betreuer: Joachim Hornegger." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2019. http://d-nb.info/1200637488/34.

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29

Reiners, Kathrin Sophie [Verfasser], Michael [Akademischer Betreuer] Fehr, and Karina A. [Akademischer Betreuer] Mathes. "The Respiratory Tract of the Bearded Dragon (Pogona spp.) : An Anatomical, Histological and Diagnostic Imaging Study / Kathrin Sophie Reiners ; Michael Fehr, Karina Mathes." Hannover : Stiftung Tierärztliche Hochschule Hannover, 2020. http://d-nb.info/1224232887/34.

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Park, Seonyeong. "Respiratory Prediction and Image Quality Improvement of 4D Cone Beam CT and MRI for Lung Tumor Treatments." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/5046.

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Identification of accurate tumor location and shape is highly important in lung cancer radiotherapy, to improve the treatment quality by reducing dose delivery errors. Because a lung tumor moves with the patient's respiration, breathing motion should be correctly analyzed and predicted during the treatment for prevention of tumor miss or undesirable treatment toxicity. Besides, in Image-Guided Radiation Therapy (IGRT), the tumor motion causes difficulties not only in delivering accurate dose, but also in assuring superior quality of imaging techniques such as four-dimensional (4D) Cone Beam Co

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Skrip, Betsy. "Imaging the airways : 3D modeling of a complete respiratory airway for use in computational flow dynamics studies of particle deposition in the lungs ; Creation of an educational animation about the respiratory system for use in the Human Visualization Project and CollaboRITorium /." Online version of thesis, 2008. http://hdl.handle.net/1850/7744.

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Herrmann, Jacob. "Frequency-dependent ventilation heterogeneity in the acutely injured lung." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6590.

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The goal of lung-protective mechanical ventilation is to provide life-sustaining support of gas exchange while minimizing the risk of ventilator-induced lung injury. Multi-frequency oscillatory ventilation (MFOV) was proposed as an alternative lung-protective modality, in which multiple frequencies of pressure and flow oscillations are delivered simultaneously at the airway opening and allowed to distribute throughout the lung in accordance with regional mechanical properties. The distribution of oscillatory flow is frequency-dependent, such that regions overventilated at one frequency may be

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Ma, Xiaopeng [Verfasser], Vasilis [Akademischer Betreuer] [Gutachter] Ntziachristos, Moritz G. F. [Gutachter] Wildgruber, and Bernhard [Gutachter] Wolfrum. "Assessment of hybrid FMT-XCT for respiratory and cardiovascular small animal imaging applications / Xiaopeng Ma ; Gutachter: Moritz G. F. Wildgruber, Bernhard Wolfrum, Vasilis Ntziachristos ; Betreuer: Vasilis Ntziachristos." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1126644110/34.

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Armstrong, Julian. "Anatomical optical coherence tomography in the human upper airway." University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0022.

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[Truncated abstract] This thesis describes the development, clinical validation and initial application of a technique for taking measurements of the shape and dimensions of the human upper airway, called anatomical optical coherence tomography (aOCT). The technique uses a transparent catheter containing a rotating optical probe which is introduced transnasally and positioned in the airway and oesophagus. Optical coherence tomography is used to take calibrated cross-sectional images of the airway lumen as the probe rotates. The probe can also be advanced or withdrawn within the catheter during

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Sekharan, Soja. "Aged soybean (Glycine max [L.] Merrill) seeds – their physiology and vigor assessment." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1135809134.

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Breuilly, Marine. "Imagerie TEMP 4D du petit animal : estimation du mouvement respiratoire et de la biodistribution de l'iode." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00908962.

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L'objectif de cette thèse est d'étudier temporellement des phénomènes évolutifs à l'aide de la tomographie d'émission monophotonique (TEMP). La première partie de cette thèse traite le problème du mouvement respiratoire dans les images TEMP de souris. Nous présentons ici une méthode permettant de détecter ce mouvement respiratoire dans les images TEMP 4D, d'extraire un signal respiratoire intrinsèque, et de déterminer la phase du cycle respiratoire sans mouvement la plus large possible. Les données enregistrées durant ces phases sans mouvement sont alors utilisées pour reconstruire une seule i

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Merlin, Thibaut. "Reconstruction 4D intégrant la modélisation pharmacocinétique du radiotraceur en imagerie fonctionnelle combinée TEP/TDM." Thesis, Bordeaux 2, 2013. http://www.theses.fr/2013BOR22111/document.

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L'imagerie TEP permet de mesurer et visualiser les changements de la distribution biologique des radiopharmaceutiques au sein des organes d'intérêt au court du temps. Ce suivi temporel offre des informations très utiles concernant les processus métaboliques et physiologiques sous-jacents, qui peuvent être extraites grâce à différentes techniques de modélisation cinétique. De plus, un autre avantage de la prise en compte de l'information temporelle dans les acquisitions TEP pour les examens en oncologie thoracique concerne le suivi des mouvements respiratoires. Ces acquisitions permettent de me

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Sencovici, Luciano. "Características do miocárdio ventricular esquerdo e do quadríceps femoral pela ressonância magnética em atletas fundistas e rasistas." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/5/5131/tde-09112017-103015/.

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INTRODUÇÃO: O aumento da cavidade ou da espessura do ventrículo esquerdo (VE) e da alteração morfológica do quadríceps se dão de forma diferente dependendo do tipo de atividade esportiva realizada (aeróbica ou anaeróbica). O presente estudo se propôs em verificar o grau de desenvolvimento da hipertrofia cardíaca e da musculatura periférica (quadríceps) em atletas fundistas e rasistas. MÉTODOS: Participaram deste estudo 16 (dezesseis) atletas de alta performance, voluntários, divididos em dois grupos: 8 (oito) atletas fundistas (corredores de 10000 metros) e 8 (oito) atletas rasistas (corredore

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Grezes-Besset, Louise. "Détection et analyse du mouvement respiratoire à partir d'images fluoroscopiques en radiothérapie." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00735816.

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Le principe de la radiothérapie est de délivrer le maximum de dose de rayons X à la tumeur en épargnant au mieux les tissus sains environnants. Dans le cas du cancer du poumon, les mouvements respiratoires représentent une difficulté majeure. L'imagerie tomodensitométrique (TDM) 4D fournit des informations de mouvement spécifique à chaque patient qui peuvent servir de base pour la construction de modèles de mouvement respiratoire. La disponibilité dans les salles de traitement d'imageurs tomographiques embarqués sur les accélérateurs linéaires permet une estimation direct du mouvement et offre

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Blé, François-Xavier Frossard Nelly Beckmann Nicolau. "Lung magnetic resonance imaging as a non-invasive alternative to assess experimental pulmonary diseases in small rodents." Strasbourg : Université Louis Pasteur, 2008. http://eprints-scd-ulp.u-strasbg.fr:8080/996/01/BLE_FrancoisX2_2007.pdf.

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Agrawal, Amit. "Nanoparticle Probes for Ultrasensitive Biological Detection and Motor Protein Tracking inside Living Cells." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/19798.

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Semiconductor quantum dots (QDs) have emerged as a new class of fluorescent probes and labeling agents for biological samples. QDs are bright, highly photostable and allow simultaneous excitation of multiple emissions. Owing to these properties, QDs hold exceptional promise in enabling intracellular biochemical studies and diagnosis with unprecedented sensitivity and accuracy. However, use of QD probes inside living cells remains a challenge due to difficulties in delivery of nanoparticles without causing aggregation and imaging single nanoparticles inside living cells. In this dissertation, a

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Marache-Francisco, Simon. "Évaluation de la correction du mouvement respiratoire sur la détection des lésions en oncologie TEP." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00770662.

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La tomographie par émission de positons (TEP) est une méthode d'imagerie clinique en forte expansion dans le domaine de l'oncologie. De nombreuses études cliniques montrent que la TEP permet, d'une part de diagnostiquer et caractériser les lésions cancéreuses à des stades plus précoces que l'imagerie anatomique conventionnelle, et d'autre part d'évaluer plus rapidement la réponse au traitement. Le raccourcissement du cycle comprenant le diagnostic, la thérapie, le suivi et la réorientation thérapeutiques contribue à augmenter le pronostic vital du patient et maîtriser les coûts de santé. La du

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Petibon, Yoann. "Développement de méthodes quantitatives en imagerie simultanée TEP-IRM." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066187.

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Le mouvement des organes durant l’acquisition et la réponse impulsionnelle (RI) du système dégradent les images obtenues par Tomographie par Emission de Positons (TEP). Récemment, les scanners simultanés TEP-Imagerie par Résonance Magnétique (IRM) ont été introduits, offrant une solution au problème du mouvement qui peut être estimé grâce à l’IRM pour corriger les images TEP. Néanmoins, pour profiter pleinement de ces nouvelles possibilités, il est également important de corriger les images des effets de la RI. L’objectif de ce travail est de proposer des méthodes TEP-IRM permettant d’améliore

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Delmon, Vivien. "Recalage déformable de projections de scanner X à faisceau conique." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0128/document.

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Évaluer quantitativement les mouvements d'un patient lors d'un traitement par radiothérapie est un enjeu majeur. En effet, ces mouvements et ces déformations anatomiques induisent une incertitude balistique conduisant les thérapeutes à augmenter les marges de sécurité, ce qui peut empêcher de délivrer une dose suffisante à la région tumorale. Dans le cadre de cette thèse, nous nous sommes intéressés à l'estimation de ces mouvements dans les images obtenues juste avant le traitement par le scanner à faisceau conique. Pour cela, nous avons utilisé des algorithmes de recalage déformable. Dans un

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Qiao, Feng. "Approaches for respiratory motion compensation in positron emission tomography imaging." Thesis, 2008. http://hdl.handle.net/1911/22237.

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Respiratory patient motion often causes image blur and inaccurate quantitation results in positron emission tomography (PET) imaging. Traditional gated acquisition approach corrects motion artifacts by generating a snapshot sequence. Each snapshot, however, is of poor image quality due to insufficient photon counts. This dissertation addresses the problem of how to correct motion artifacts without sacrificing image quality or extending scan duration. To this end, a motion-incorporated model of the PET imaging system has been developed which enables utilization of data acquired during the entir

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Maurer, Jacqueline. "Four-Dimensional Imaging of Respiratory Motion in the Radiotherapy Treatment Room Using a Gantry Mounted Flat Panel Imaging Device." Diss., 2010. http://hdl.handle.net/10161/3011.

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<p>Imaging respiratory induced tumor motion in the radiation therapy treatment room could eliminate the necessity for large motion encompassing margins that result in excessive irradiation of healthy tissues. Currently available image guidance technologies are ill-suited for this task. Two-dimensional fluoroscopic images are acquired with sufficient speed to image respiratory motion. However, volume information is not present, and soft tissue structures are often not visible because a large volume is projected onto a single plane. Currently available volumetric imaging modalities are not a

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"Respiratory motion correction techniques in positron emission tomography/computed tomography (PET/CT) imaging." Thesis, 2010. http://hdl.handle.net/1911/62125.

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The aim of this thesis is to design, implement, and evaluate respiratory motion correction techniques that can overcome respiratory motion artifacts in PET/CT imaging. The thesis is composed of three main sections. The first section introduces a novel approach (free-breathing amplitude gating (FBAG) technique) to correct for respiratory motion artifacts. This approach is based on sorting the acquired PET data in multiple amplitude bins which is currently not possible on any commercial PET/CT scanner. The second section is focused on the hardware/software design of an in-house respiratory gatin

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"The utility of medical imaging in a novel infection: research based on severe acute respiratory syndrome (SARS)." Thesis, 2005. http://library.cuhk.edu.hk/record=b6074081.

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Background. Medical imaging has played an important role in the diagnosis, progress monitoring and follow-up of most disease entities, in particular chest infections. The emergence of a novel chest disease poses an immediate challenge to the pillars of imaging, namely chest radiography and computed tomography. The characteristic imaging appearances, differential diagnoses and diagnostic pitfalls need to be established for correct diagnosis and appropriate management. The sensitivity and utility of the different imaging modalities will also need to be addressed.<br>In the event of an outbreak o

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Wang, Chi-chung, and 王基崇. "Self-gated PROPELLER cine cardiac imaging: Simultaneously tracking the cardiac pulsation and the respiratory motion." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/7yqgvw.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>95<br>In order to reduce motion-related artifacts, breath-holding and EKG trigger is generally required for cardiac MRI. However, in the clinical practice, some patients can not perform voluntary breath-hold and the EKG trigger system sometimes fails due to the interference of magnetic field and gradient system. To solve this problem, a new cardiac imaging technique with the need for EKG trigger and breath-hold, is proposed. This new cardiac imaging technique, which is designed for cine cardiac imaging, is based on self-gating technique with PROPELLER encoding. By th

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Vergalasova, Irina. "On-Board Imaging of Respiratory Motion: Investigation of Markerless and Self-Sorted Four-Dimensional Cone-Beam CT (4D-CBCT)." Diss., 2013. http://hdl.handle.net/10161/7144.

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<p>To date, image localization of mobile tumors prior to radiation delivery has primarily been confined to 2D and 3D technologies, such as fluoroscopy and 3D cone-beam CT (3D-CBCT). Due to the limited information from these images, larger volumes of healthy tissue are often irradiated in order to ensure the radiation field encompasses the entirety of the target motion. Since the overarching goal of radiation therapy is to deliver maximum dose to cancerous cells and simultaneously minimize the radiation delivered to healthy surrounding tissues, it would be ideal to use 4D imaging to obtain time

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