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Relevant bibliographies by topics / Ultrasound imaging / Dissertations / Theses

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Dissertations / Theses on the topic 'Ultrasound imaging'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Boulos, Paul. "Ultrasound imaging of the ultrasound thrombolysis." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1251/document.

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Les techniques de thérapie par ultrasons sont apparues très récemment avec la découverte des ultrasons de haute intensité focalisée. La thrombolyse ultrasonore extracorporelle en fait partie et se base sur la destruction mécanique du thrombus causée par la cavitation acoustique. Cependant, c'est un phénomène mal contrôlé. Ainsi, un meilleur contrôle de l'activité de cavitation et sa localisation pendant la thérapie est essentiel pour considérer le développement d'un dispositif thérapeutique. Un prototype a déjà été conçu et amélioré avec une boucle de rétroaction en temps réel afin de contrôle

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2

Vadalma, Anthony. "Smartphone ultrasound imaging." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/204111/1/Anthony_Vadalma_Thesis.pdf.

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This research project titled 'Smartphone Ultrasound Imaging' aimed to develop an affordable, portable and single handed ultrasound-imaging device to be used in hospitals, developing world nations as well as rural and remote Australia. This study examined the feasibility of combining a conventional smartphone with an ultrasound probe into one single device. All necessary ultrasound signal processing components were built and smartphone applications were developed to successfully transmit data either via Bluetooth or Wi-Fi from the ultrasound to the smartphone.

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3

Abeysekera, Jeffrey Michael. "Three dimensional ultrasound elasticity imaging." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57462.

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Changes in tissue elasticity are correlated with certain pathological changes, such as localized stiffening of malignant tumours or diffuse stiffening of liver fibrosis or placenta dysfunction. Elastography is a field of medical imaging that characterizes the mechanical properties of tissue, such as elasticity and viscosity. The elastography process involves deforming the tissue, measuring the tissue motion using an imaging technique such as ultrasound or magnetic resonance imaging (MRI), and solving the equations of motion. Ultrasound is well suited for elastography, however, it presents chal

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4

Tamraoui, Mohamed. "Sparse array 3D ultrasound imaging." Electronic Thesis or Diss., Lyon 1, 2024. https://theses.hal.science/tel-04828515.

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Les sondes sparses présentent plusieurs avantages notables par rapport aux autres techniques de réduction d'éléments pour l'imagerie ultrasonore 3D. L'un des avantages les plus prometteurs est leur capacité à orienter librement le faisceau ultrasonore dans toutes les directions, ce qui agrandit considérablement le champ de vue. Cette capacité ouvre des possibilités pour la mise en œuvre de séquences d'imagerie avancées, telles que les ondes divergentes, qui sont particulièrement bénéfiques pour des applications comme l'échocardiographie. De plus, les sondes sparses utilisent moins d'éléments,

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5

Alomari, Zainab Rami Saleh. "Plane wave imaging beamforming techniques for medical ultrasound imaging." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18127/.

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In ultrasound array imaging, the beamforming operation is performed by aligning and processing the received echo signals from each individual array element to form a complete image. This operation can be performed in many different ways, where adaptive and non-adaptive beamformers are considered as the main categories. Adaptive beamformers exploit the statistical correlation between the received data to find a weighting value at the focal point, instead of using a fixed weighting window in non-adaptive beamforming. This results in a significant improvement in the image quality in terms of reso

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6

Siepmann, Monica [Verfasser]. "Quantitative Molecular Ultrasound Imaging / Monica Siepmann." München : Verlag Dr. Hut, 2012. http://d-nb.info/1025821548/34.

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7

Naish, Claudia Martha. "Ultrasound imaging of the intervertebral disc." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288301.

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8

Christensen-Jeffries, Kirsten Mia. "Super-resolution ultrasound imaging with microbubbles." Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/superresolution-ultrasound-imaging-with-microbubbles(fd0a1f07-a7d9-4393-bbfd-396cefff60a9).html.

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Ultrasound imaging is one of the most widely used clinical imaging methods offering safe, real-time imaging at low cost with excellent accessibility. However, the structure and flow of deep microvasculature, which can serve as a marker of pathological or dysfunctional tissue, cannot be adequately resolved using standard clinical ultrasound imaging frequencies due to diffraction. Conventional ultrasound imaging resolution is related to the wavelength employed, however, high frequency approaches used to improve resolutions are limited in penetration depth. Therefore, there is a crucial clinical

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9

Zheng, Hairong. "Ultrasound contrast agents and their applications for novel ultrasound imaging techniques." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3207695.

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10

Al-Mejrad, Ali Saleh Khalid. "Medical ultrasound : a study of real-time three dimensional ultrasound imaging." Thesis, University of Edinburgh, 1996. http://hdl.handle.net/1842/21190.

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Ultrasonic techniques are very widely applied in medicine. Real-time two dimensional imaging is a technology which is extremely well-suited to medical applications since it enables moving structures to be observed and rapid searching through tissue structures to be performed. Three-dimensional (3D) ultrasonic imaging techniques have been developed but to date there has been very limited success in the development of real-time versions. The aim of this thesis is to study the feasibility of real-time 3D ultrasonic imaging to see if ways can be found to overcome the fundamental problem of sparcit

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11

Varslot, Trond. "Wavefront aberration correction in medical ultrasound imaging." Doctoral thesis, Norwegian University of Science and Technology, Department of Mathematical Sciences, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1906.

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<p>Medisinsk ultralydavbildning er et relativt rimelig verktøy som er i utstrakte bruk på dagens sykehus og tildels også legekontor. En underliggende antakelse ved dagens avbildningsteknikker er at vevet som skal avbildes i grove trekk er homogent. Det vil i praksis si at de akustiske egenskapene varierer lite. I tilfeller der denne forutsetningen ikke holder vil resultatet bli betraktlig reduksjon av bildekvaliteten. Prosjektet har fokusert på hvordan man best mulig kan korrigere for denne kvalitetsforringelsen. Arbeidet har resultert i et styrket teoretisk rammeverk for modellering, programv

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12

Simpson, Cecilie Øinæs. "Objective Image Quality Metrics for Ultrasound Imaging." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8988.

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<p>Objective evaluation of the image quality on ultrasound images is a comprehensive task due to the relatively low image quality compared to other imaging techniques. It is desirable to objectively determine the quality of ultrasound images since quantification of the quality removes the subjective evaluation which can lead to varying results. The scanner will also be more user friendly if the user is given feedback on the quality of the current image. This thesis has investigated in the objective evaluation of image quality in phantom images. It has been emphasized on the parameter spatial

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13

Børstad, Thomas Kristoffersen. "Intraoperative Ultrasound Strain Imaging of Brain Tumors." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14039.

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Intraoperative ultrasound strain imaging of the brain visualizes brain tissue deformation as an image. The hypothesis is that strain and elastographic values can be used to complement conventional B-mode image in the task of brain tumor segmentation. A key asumption is that the natural pulsation of the cerebral arteries causes deformation in the brain tissue that is measurable with ultrasound.Strain values are found with a least-squares technique that estimates the spatial derivative of axial velocity, which in turn is mea- sured using a phase-based velocity estimator. A correlation coefficien

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14

Hor, King Wei. "Instrumentation and ultrasound imaging for epidural anesthesia." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/32735.

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The loss-of-resistance technique in epidural anesthesia is the accepted standard for indicating the entry of the needle into the epidural space. In conventional epidurals, it is also the only feedback mechanism to confirm needle entry. Unsuccessful epidurals due to the technical difficulties can result in mild to severe complications. These difficulties include correctly choosing the puncture site and needle trajectory, which are determined solely by palpation and the experience of the anesthesiologist. Instrumentation of the thumb's force on the plunger of the syringe, displacement of t

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15

Tong, Shidong. "Three-dimensional ultrasound imaging of the prostate." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq28526.pdf.

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16

Javanmard, Mehdi. "Inverse problem approach to ultrasound medical imaging." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/NQ31933.pdf.

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17

Saad, Ashraf A. "Vessel recognition in color Doppler ultrasound imaging /." Thesis, Connect to this title online; UW restricted, 2008. http://hdl.handle.net/1773/5976.

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18

Arif, Muhammad. "Ultrasound harmonic imaging using chirp coded excitation." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555857.

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Medical ultrasound imaging with the nonlinear second harmonic component (SHC) provides improved spatial resolution and reduced reverberation artifacts. However, the signal-to-noise ratio (SNR) of the SHC is low compared to the fundamental frequency component. In this study, chirp coded signals are explored as an exci- tation technique in ultrasound harmonic imaging. The objective is to increase the SNR of the SHC and improve the axial resolution of ultrasound harmonic imaging using a single transmission event. In ultrasound harmonic imaging with chirp coded excitation, a harmonic matched filte

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19

Lin, Fanglue. "Ultrasound contrast imaging with multi-pulse transmission." Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-01018646.

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In ultrasound imaging domain, nonlinear imaging has become an important branch. Nonlinear imaging can be divided into tissue harmonic imaging and contrast harmonic imaging, according to where the nonlinear signals come from. Contrast harmonic imaging emerges because contrast agents, which are intravenously injected to enhance the weak echoes backscattered from blood cells, can vibrate nonlinearly when they undergo an acoustic pressure. Then, these nonlinear signals backscattered by contrast agents are collected to form harmonic images. However, during the wave propagation in tissue, the harmon

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20

Syn, Michael Hsien-Min. "Model-based three-dimensional freehand ultrasound imaging." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627596.

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21

Lambert, William. "Matrix approach for ultrasound imaging and quantification." Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLS028.

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L’échographie est basée sur deux hypothèses fondamentales. D’une part, la vitesse du son est considérée comme constante dans le milieu de propagation. D’autre part, les échos rétrodiffusés par les diffuseurs du milieu sont issus de phénomènes de diffusion simple. En réalité, ces hypothèses ne sont pas toujours vérifiées : des variations de vitesse du son entre les différents tissus sondés peuvent induire de fortes distorsions du front d'onde (aberrations) et des évènements de diffusion multiple peuvent survenir entre les réflecteurs du milieu. Ces deux phénomènes indésirables conduisent à une

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22

Harput, Sevan. "Use of chirps in medical ultrasound imaging." Thesis, University of Leeds, 2012. http://etheses.whiterose.ac.uk/4436/.

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A "chirp" is a frequency modulated signal widely used in ultrasound imaging to increase the signal-to-noise ratio and penetration depth. In medical ultrasound imaging, resolution and penetration are two major criteria that are inversely proportional. Because of this inverse relation, short duration pulses cannot achieve a high resolution with good penetration. The reasons for this trade-off are the decrease in signal energy due to shorter pulse duration and the attenuation in tissue, which increases with the excitation frequency. The chirp coded excitation however can increase the total transm

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23

Diamantis, Konstantinos. "Precise scatterer localization for ultrasound contrast imaging." Thesis, Heriot-Watt University, 2017. http://hdl.handle.net/10399/3250.

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This thesis is concerned with developing algorithms for the precise localization of ultrasound point scatterers with an eye to super-resolution ultrasound contrast imaging. In medical ultrasound, the conventional resolution is limited by diffraction and, in contrast to other sensing fields, point source imaging has not been extensively investigated. Here, two independent methods were proposed aiming to increase the lateral and the axial resolution respectively, by improving the localization accuracy of a single scatterer. The methods were examined with simulated and experimental data by using

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24

Dia, Amadou Sall. "Quantitative ultrasound imaging of human cortical bone." Electronic Thesis or Diss., Sorbonne université, 2024. https://theses.hal.science/tel-04650855.

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L'ostéoporose est une maladie caractérisée par une réduction de la masse osseuse et une augmentation de la porosité. Elle affaiblit les os et peut conduire à des fractures de fragilité. Globalement, 1/3 des femmes de plus de 50 ans et 1/5 des hommes de plus de 50 ans subiront des fractures liées à l'ostéoporose, contribuant à plus de 8,9 millions de fractures annuelles dans le monde. Ces fractures peuvent être prévenues si elles sont détectées et traitées suffisamment tôt. Plusieurs techniques ont été développées pour évaluer la qualité osseuse, l'échographie émergeant comme une option peu coû

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25

Gomersall, William Henry. "Deconvolution of three-dimensional medical ultrasound." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609431.

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26

McDannold, Nathan J. "MRI monitoring of high temperature ultrasound therapy /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2002.

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Thesis (Ph.D.)--Tufts University, 2002.<br>Adviser: David Weaver. Submitted to the Dept. of Physics. Includes bibliographical references (leaves 218-243). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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27

Khoei, Shadi. "Quantitative ultrasound computed tomography imaging of PAGAT radiation dosimetry gel." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/63958/1/Shadi_Khoei_Thesis.pdf.

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This research developed and scientifically validated a new ultrasound transmission computed tomography system with the aim of quantitative assessment of a polymer gel dosimeter including dose response verification of ultrasonic parameters of attenuation, velocity and broadband ultrasound attenuation (BUA). This work was the first to investigate and report ultrasound frequency dependent attenuation in a gel dosimeter, demonstrating a dose dependence.

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28

Kwiecinski, Wojciech. "Ultrasound cardiac therapy guided by elastography and ultrafast imaging." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066131/document.

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La fibrillation atriale affecte 2-3% des européens et nord-américains, les tachycardies ventriculaires sont liées à un risque important de mort subite. Les approches minimalement invasives comme l’Ablation par Cathéter Radiofréquence (RFCA) ont révolutionné le traitement de ces maladies, mais le taux de réussite de la RFCA est limité par le manque de techniques d’imagerie pour contrôler cette ablation thermique.Le but de cette thèse est de proposer de nouvelles approches ultrasonores pour des traitements cardiaques minimalement invasifs guidés par échographie.Pour cela nous avons d’abord valid

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29

Leung, Kwok-yin, та 梁國賢. "Prenatal ultrasound prediction of homozygous α⁰-thalassemia". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B47454039.

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Homozygous α0-thalassemia is a serious autosomal recessive disorder with poor fetal outcome and severe maternal complications. Conventionally, prenatal diagnosis is performed by an invasive test. A non-invasive approach using serial ultrasonography can effectively reduce the need for invasive tests in unaffected pregnancies. For two-dimensional ultrasound prediction, a total of 777 at-risk fetuses were studied from 12 to 20 weeks between 1995 and 2006. At 12–15 weeks’ gestation, the highest sensitivity (98.3%) was achieved by the combination of fetal cardiothoracic ratio (CTR) and/o

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30

York, George W. P. "Architecture and algorithms for a fully programmable ultrasound system /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/5931.

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31

Quartararo, John David. "Semi-automated segmentation of 3D medical ultrasound images." Worcester, Mass. : Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-020509-161314/.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: 3d ultrasound; ultrasound; image processing; image segmentation; 3d image segmentation; medical imaging Includes bibliographical references (p.142-148).

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32

Managuli, Ravi A. "Programmable ultrasound color flow system /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/6064.

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33

Bjåstad, Tore Grüner. "High frame rate ultrasound imaging using parallel beamforming." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for sirkulasjon og bildediagnostikk, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-5298.

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The human heart contracts and relaxes approximately once each second. This is a complex process where different parts of the cardiac tissue contract and relax at different times and at different rates. The accurate evaluation of this deformation with ultrasound requires the use of a high frame rate. The frame rate of a conventional ultrasound image is limited by the round trip propagation time of the sound pulse along each of the scan lines covering the imaged object. A common technique to increase the frame rate is multiple line acquisition, MLA. Using this technique, several scan lines are a

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34

Walker, Conrad Leigh. "Quantitative magnetic resonance imaging of ultrasound acoustic fields." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29273.pdf.

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35

Hope, Simpson David. "Detecting and imaging microbubble contrast agents with ultrasound." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0016/NQ53785.pdf.

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36

Bálint, Péter Vince. "Ultrasound imaging in joint and soft tissue inflammation." Thesis, University of Glasgow, 2002. http://theses.gla.ac.uk/2266/.

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The use of ultrasound as an extended and more objective investigation performed as an extension of physical examination has a potential role in studying inflammation in different rheumatic diseases such as rheumatoid arthritis (RT) and spondylarthropathy (SpA). Rheumatoid arthritis is a chronic disease causing joint inflammation and destruction. Metacarpophalangeal (MCP) joint involvement is one of the earliest and most permanent signs of RA. US has been used to detect synovitis and erosions in MCP joints with high accuracy when compared to X-ray and magnetic resonance imaging (MRI). In RA joi

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37

Southern, James Alastair. "Mathematical and computational modelling of ultrasound elasticity imaging." Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:242fddf0-ef9c-4a90-88f5-c7b41f4bda5a.

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In this thesis a parameter recovery method for use in ultrasound elasticity imaging is developed. Elasticity imaging is a method for using a series of ultrasound images (and the displacement field between them) to estimate the spatial variation of the stiffness of the tissue being imaged. Currently iterative methods are used to do this: a model of tissue mechanics is assumed and a large number of simulations using varying parameters are compared to the actual displacement field. The aim of this work is to develop a solution method that works back from the known displacement field to determine

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38

Khullar, Vikram. "Ultrasound imaging of the female lower urinary tract." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391595.

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39

Lindop, Joel Edward. "2D and 3D elasticity imaging using freehand ultrasound." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612271.

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40

Kadour, Michael J. "Assisted-freehand ultrasound elasticity imaging of the breast." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670171.

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41

Subramanian, Swetha. "Thermal Ablation Monitoring Using Ultrasound Echo Decorrelation Imaging." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428068754.

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42

Gao, Liang. "Ultrasound Elasticity Imaging of Human Posterior Tibial Tendon." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/338897.

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Posterior tibial tendon dysfunction (PTTD) is a common degenerative condition leading to a severe impairment of gait. There is currently no effective method to determine whether a patient with advanced PTTD would benefit from several months of bracing and physical therapy or ultimately require surgery. Tendon degeneration is closely associated with irreversible degradation of its collagen structure, leading to changes to its mechanical properties. If these properties could be monitored in vivo, it could be used to quantify the severity of tendonosis and help determine the appropriate treatment

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43

Almualimi, Majdi A. "Ultrasound transit time spectroscopy for enhanced medical imaging." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/119165/1/Majdi_Almualimi_Thesis.pdf.

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Ultrasound imaging is used extensively in a large range of medical applications and currently represents over 25% of all types of diagnostic images produced around the world. Like any imaging modality, ultrasound is negatively affected by factors such as noise and artefacts that reduce the image quality. Phase interference is considered to be one of the key factors affecting spatial resolution. This thesis examined the ability of ultrasound transit time spectroscopy (UTTS) to compensate for phase interference and to improve not only the axial but also the spatial resolution of ultrasound image

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Zheng, Xing. "Ultrasound image processing and transmission for medical diagnosis /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?COMP%202003%20ZHENGX.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.<br>Includes bibliographical references (leaves 66-69). Also available in electronic version. Access restricted to campus users.

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45

Neethling-Du, Toit Merle. "Ultrasound features of the deep infrapatellar Bursa." Thesis, Cape Peninsula University of Technology, 2006. http://hdl.handle.net/20.500.11838/2584.

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Thesis (MTech (Radiography))--Cape Peninsula University of Technology, 2006.<br>The knee is one of the most complicated joints in the body. The deep infrapatellar bursa being only a small water-pocket and forming a small part of the knee. The deep infrapatellar bursa can get inflamed and cause great discomfort, especially to professional sportsmen and -women. If such a inflammation is present, a common treament option are to inject a cortisone solution into the bursa for quick relieve and healing. This study was performed to investigate the specific ultrasound features of a normal de

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46

Chen, Qing-Xin. "On ferroelectric polymer transducers and imaging arrays." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303406.

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47

Basoglu, Chris. "A generalized programmable system and efficient algorithms for ultrasound backend processing /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/5978.

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48

Goldsmith, Abraham Myron. "An inertial-optical tracking system for quantitative, freehand, 3D ultrasound." Worcester, Mass. Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-011609-133509/.

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49

Måsøy, Svein-Erik. "Estimation and Correction of Aberration in Medical Ultrasound Imaging." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-385.

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<p>The work presented in this thesis is devoted to studying aberration in ultrasound medical imaging, and to provide methods for correcting aberration of ultrasound signals in order to obtain optimum image quality. The thesis is composed of five chapters. All chapters may be read individually. The presented results are generated from simulations.</p><p>Chapter 1 presents a description of the aberration phenomenon, and a brief discussion of its medical and practical implications. A mathematical description of aberration is introduced by modelling the Green's function for propagation in a hetero

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Hofstad, Erlend Fagertun. "Ultrasound Contrast Imaging - Improved Tissue Suppression in Amplitude Modulation." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9316.

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<p>The ability to image myocardial perfusion is very important in order to detect coronary diseases. GE Vingmed Ultrasound uses contrast agent in combination with a pulse inversion (PI) technique to do the imaging. But this technique does not function sufficiently for all patients. Therefore have other techniques been tested out, including transmission of pulses with different amplitude (AM), to enhance the nonlinear signal from contrast bubbles. But a problem achieving sufficient cancellation of linear tissue signal is a feebleness of the method. In this diploma work has an effort been put i

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