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Journal articles on the topic 'Ionization chamber dosimetry system'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Moussous, Ouiza, and Toufik Medjadj. "A standard Fricke dosimeter compared to an ionization chamber used for dosimetric characterization of 60Co photon beam." Polish Journal of Medical Physics and Engineering 22, no. 2 (2016): 19–24. http://dx.doi.org/10.1515/pjmpe-2016-0005.

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Abstract The main objective of this study was to investigate the Fricke dosimeter water equivalent system for measurement of dosimetric parameters for photon beam. The parameters measured with the Fricke dosimeter were compared to those obtained with an ionization chamber. In this work characteristics for 60Co γ-rays of field sizes ranging from 5 × 5 cm2 to 20 × 20 cm2 are reported. The measurements were carried out in the secondary standard dosimetry laboratory using a collimated 60Co gamma source therapy unit. The 60Co beam output in terms of absorbed dose to water was obtained as per IAEA T
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Reza, Md Ali, Md Rakibul Islam, Md Shakilur Rahman, Md Shamsuzzaman, Md Rashedur Rahman, and Harnur Rashid Khan. "Calibration of Therapy Level Ionization Chamber at 60Co Teletherapy Beam Used for Radiation Therapy." International Letters of Chemistry, Physics and Astronomy 79 (August 2018): 1–8. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.79.1.

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The accuracy and traceability of absorbed dose to water measurement of radiotherapy beam is a critical issue to achieve the curative outcome of cancer patients. The current dosimetry protocols for radiotherapy beams TRS-398, TG-51 and DIN-6800-2 are based on the calibration factor of ionization chamber in terms of absorbed dose to water for 60Co beam. The accuracy of the calibration factor of ionization chamber as well as output of radiotherapy beam is the primary requirements of precisional dose deliver to the tumor which is the QA part of radiotherapy dosimetry. In the present study, we have
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3

Pojtinger, Stefan, Oliver S. Dohm, and Daniela Thorwarth. "Optimal orientation for ionization chambers in MRgRT reference dosimetry." Current Directions in Biomedical Engineering 3, no. 2 (2017): 273–75. http://dx.doi.org/10.1515/cdbme-2017-0056.

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AbstractThe interest in hybrid systems combining magnetic resonance imaging and medical linear accelerator (MR-Linac) is rapidly increasing due to the clinical availability of different systems. Reference dosimetry is a critical issue for integrating these devices into clinical practice. However, the response of ionization chambers changes according to the distinct orientation of the chamber with respect to the magnetic field. In this study, we have carried out Monte Carlo simulations to identify an optimal orientation for thimble type chambers in MRgRT reference dosimetry. Our findings sugges
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Román-Raya, Juan, Isidoro Ruiz-García, Pablo Escobedo, Alberto J. Palma, Damián Guirado, and Miguel A. Carvajal. "Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy." Sensors 20, no. 6 (2020): 1568. http://dx.doi.org/10.3390/s20061568.

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Safe quality control of radiotherapy treatments lies in reliable dosimetric sensors. Currently, ionization chambers and solid-state diodes along with electrometers as readout systems are accomplishing this task. In this work, we present a well-known and low-cost semiconductor sensor, the light-dependent resistor (LDR), as an alternative to the existing sensing devices for dosimetry. To demonstrate this, a complete characterization of the response to radiation of commercial LDRs has been conducted in terms of sensitivity, reproducibility and thermal correction under different bias voltages. Irr
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Brand, Nicole, Stefan Pojtinger, Savas Tsitsekidis, Daniela Thorwarth, and Oliver S. Dohm. "Experimental analysis of correction factors for reference dosimetry in a magnetic field." Current Directions in Biomedical Engineering 3, no. 2 (2017): 803–5. http://dx.doi.org/10.1515/cdbme-2017-0170.

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AbstractToday, hybrid systems of linear accelerator and MRI scanner are clinically available. Therefore it is important to investigate the feasibility of reference dosimetry with ionization chambers in the presence of a magnetic field and determine correction factors. In this work, correction factors under various conditions that influence the chamber response were experimentally investigated, using a conventional 6 MV linear accelerator together with a stand-alone magnet. We found that the correction factor for a PTW31010 ionization chamber ranges from 0.9873 to 1.009 depending on the magneti
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Renner, Timothy R., William T. Chu, Bernhard A. Ludewigt, Mark A. Nyman, and Ronald Stradtner. "Multisegmented ionization chamber dosimetry system for light ion beams." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 281, no. 3 (1989): 640–48. http://dx.doi.org/10.1016/0168-9002(89)91501-5.

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7

Austerlitz, Carlos de, Viviane Souza, Heldio Pereira Villar, and Aloisio Cordilha. "The use of fricke dosimetry for low energy x-rays." Brazilian Archives of Biology and Technology 49, spe (2006): 17–23. http://dx.doi.org/10.1590/s1516-89132006000200004.

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The performance of four X-ray qualities generated in a Pantak X-ray machine operating at 30-100 kV was determined with a parallel-plate ionization chamber and a Fricke dosimeter. X-ray qualities used were those recommended by Deutsch Internationale Normung DIN 6809 and dose measurements were carried out with Plexiglas® simulators. Results have shown that the Fricke dosimeter can be used not only for soft X-ray dosimetry, but also for the maintenance of low-energy measuring systems' calibration factor.
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8

Novario, Raffaele, Paola Stucchi, Lucia Perna, and Leopoldo Conte. "Radiotherapy Treatment Verification." Tumori Journal 84, no. 2 (1998): 144–49. http://dx.doi.org/10.1177/030089169808400209.

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During a radiotherapy treatment, a dosimetric verification or a geometric localization can be done, in order to assess the quality of the treatment. The dosimetric verification is generally performed measuring the dose at some points inside (natural cavities) or outside the patient, and comparing it to the dose at the same points calculated and predicted by the treatment planning system. This can be done either with thermoluminescent or diodes dosimeters or with ionization chambers. The geometric localization can be done acquiring a portal image of the patient. Portal imaging can be performed
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9

Agazaryan, Nzhde, Wolfgang Ullrich, Steve P. Lee, and Timothy D. Solberg. "A methodology for verification of radiotherapy dose calculation." Journal of Neurosurgery 101, Supplement3 (2004): 356–61. http://dx.doi.org/10.3171/sup.2004.101.supplement3.0356.

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Object. A methodology for dosimetric verification of radiation therapy plans was developed and implemented. Dosimetric accuracy of clinically active intensity-modulated radiotherapy (IMRT) and intensity-modulated radiosurgery (IMRS) programs was assessed using this methodology. Methods. The methodology included several dosimetric tasks that were performed to assess the dosimetric accuracy of a treatment plan. Absolute dosimetry of the composite plan was performed using an ionization chamber. Film dosimetry was performed for each individual field and for the multifield composite plan. Calculate
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10

Misiarz, Agnieszka, Bożena Malesa, Wasyl Markopolskyi, Ewa Jakubowska, and Jerzy Wyspokiński. "Solutions and constructional modifications of dosimetry systems ofelectron accelerators." Letters in Oncology Science 16, no. 4 (2019): 18–26. http://dx.doi.org/10.21641/los.2019.4.16.161.

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The study is designed to present a method of dosimetry system solution in electron accelerators manufactured at the NCBJ Nuclear Equipment Division (HITEC). Two special cases of accelerator applications have been presented - the first using a high-efficiency electron beam in material research and the second using a low-efficiency photon beam in cargo inspection at borders. The article presents constructional modifications of the standardly used ionization chamber, which successfully enabled proper dose measurement in both of the above-mentioned cases.
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11

Watson, P., H. Bekerat, P. Papaconstadopoulos, and J. Seuntjens. "OC-0406: Validation of the INTRABEAM system dosimetry with ionization chamber and EBT3 film measurements." Radiotherapy and Oncology 127 (April 2018): S207—S208. http://dx.doi.org/10.1016/s0167-8140(18)30716-3.

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12

Abdelfattah, Rasha Moustafa, N. Ahmed Deiab, M. Hassan Elnaggar, M. Hany Khedr, and R. Abdelmoneim Rizk. "Dose distributions verification for High dose rate brachytherapy plans by using ionization chambers 2D array." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 15, no. 3 (2016): 6618–25. http://dx.doi.org/10.24297/ijct.v15i3.1685.

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The purpose of this paper is to perform dosimetric verification (in-phantom) of dose distributions calculated with treatment planning system (TPS) by using 2D chamber array device in HDR brachytherapy. HDR brachytherapy treatment plans’dose distribution verification is performed using the two-dimensional (2D) ionization chamber array MatriXX Evolution developed by IBA Dosimetry (IBA Dosimetry, Germany) whose detector area is covered with the Nucletron Freiburg Flap Applicator Set (Nucletron BV,Veenendaal, the Netherlands) with catheters such that the detector plane was set to 0.86 cm from t
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13

Nassef, Mohamed Hamed. "Image Quality Assessment and Radiation exposure in Intra Oral Dental Radiography." International Journal for Innovation Education and Research 5, no. 2 (2017): 75–84. http://dx.doi.org/10.31686/ijier.vol5.iss2.623.

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In this study, an intra oral dental unit (Siemens-70) at King Abdul Aziz University (KAU) Dental Hospital was selected and investigated for visual image quality assessment and radiation protection purposes. Radiation dosimetry for determining the optimum image quality with the lowest radiation exposure to the patient was carried out. A DXTTR dental radiography trainer phantom head and neck, portable survey meter Model RAD EYE-B20, and radiation dosimetry system RADCAL Acuu-pro were used in this study. RADCAL Accu-pro is a non-invasive kV system, reliable instruments to measure and diagnose all
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14

Becker, J., E. Brunckhorst, A. Roca, et al. "Set-up and calibration of a triple ionization chamber system for dosimetry in mixed neutron/photon fields." Physics in Medicine and Biology 52, no. 13 (2007): 3715–27. http://dx.doi.org/10.1088/0031-9155/52/13/004.

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15

MOWLAWI, ALI ASGHAR, and MAJED YAZDANI. "DOSE DISTRIBUTION CALCULATION IN SKIN CANCER TREATMENT USING LEIPZIG APPLICATOR." International Journal of Modern Physics B 24, no. 05 (2010): 599–604. http://dx.doi.org/10.1142/s0217979210054634.

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The combination of 192 Ir seed with the Leipzig applicators is used in a considerable number of clinical trials for skin cancer treatment. As is known, the beneficial effects of ionizing radiation for tumor treatment depends on the dosimetry accuracy. Nowadays, dosimetry calculations are supported by the characteristics provided by the manufacturer, which have been obtained from measurements with an ionization chamber in a phantom. Despite their benefit, the experimental data involves errors related to the positioning, energy, and angular dependence of the detectors. Thus, in order to get a de
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16

Omojola, Akintayo Daniel, Samuel Olaolu Adeneye, Michael Onoriode Akpochafor, Isiaka Olusola Akala, and Azuka Anthonio Agboje. "Comparison of entrance surface air kerma measurement with MTS-N (LiF: Mg, Ti) chips with a kilovoltage X-ray source." ASEAN Journal of Radiology 22, no. 1 (2021): 20–34. http://dx.doi.org/10.46475/aseanjr.v22i1.96.

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Objective: Radiation detectors are key components that ensure the accuracy and performances of dosimetry equipment. The study is aimed to compare the mean entrance surface air kerma (ESAK) between a DCT-10mm ionization chamber (IC) and MTS-N (LiF: Mg, Ti) chips when both detectors are exposed to ≤ 5mGy with a 10 by 10 field size, with an X-ray source and to determine the accuracy of the Thermoluminescent (TL) chips. Also, the dose will be compared to similar studies. Materials and Methods: A functional, Digital Radiography (DR) X-ray System was used. A DCT-10mm ionization chamber (IC) and an X
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17

Scuderi, Valentina, Antonino Amato, Antonio Amico, et al. "Diagnostics and Dosimetry Solutions for Multidisciplinary Applications at the ELIMAIA Beamline." Applied Sciences 8, no. 9 (2018): 1415. http://dx.doi.org/10.3390/app8091415.

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ELI (Extreme Light Infrastructure) multidisciplinary applications of laser-ion acceleration (ELIMAIA) is one the user facilities beamlines of the ELI-Beamlines facility in Prague. It will be dedicated to the transport of laser-driven ion beams and equipped with detectors for diagnostics and dosimetry, in order to carry out experiments for a broad range of multidisciplinary applications. One of the aims of the beamline is also to demonstrate the feasibility of these peculiar beams for possible medical applications, which means delivering controllable and stable beams, properly monitoring their
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18

Kong, C. W., H. Geng, W. W. Lam, et al. "A Complexity-Based Correction Factor for a Commercial 4-Dimensional Ionization Chamber Array System on IMRT Dosimetry Quality Assurance Measurements." International Journal of Radiation Oncology*Biology*Physics 96, no. 2 (2016): E609—E610. http://dx.doi.org/10.1016/j.ijrobp.2016.06.2155.

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19

Radojcic, Đeni Smilovic, David Rajlic, Bozidar Casar, et al. "Evaluation of two-dimensional dose distributions for pre-treatment patient-specific IMRT dosimetry." Radiology and Oncology 52, no. 3 (2018): 346–52. http://dx.doi.org/10.2478/raon-2018-0019.

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Abstract Background The accuracy of dose calculation is crucial for success of the radiotherapy treatment. One of the methods that represent the current standard for patient-specific dosimetry is the evaluation of dose distributions measured with an ionization chamber array inside a homogeneous phantom using gamma method. Nevertheless, this method does not replicate the realistic conditions present when a patient is undergoing therapy. Therefore, to more accurately evaluate the treatment planning system (TPS) capabilities, gamma passing rates were examined for beams of different complexity pas
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20

Rueda, Alexis N., César Ruiz-Trejo, Eduardo López-Pineda, Mario E. Romero-Piña, and Luis A. Medina. "Dosimetric Evaluation in Micro-CT Studies Used in Preclinical Molecular Imaging." Applied Sciences 11, no. 17 (2021): 7930. http://dx.doi.org/10.3390/app11177930.

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In microCT imaging, there is a close relationship between the dose of radiation absorbed by animals and the image quality, or spatial resolution. Although the radiation levels used in these systems are generally non-lethal, they can induce cellular or molecular alterations that affect the experimental results. Here, we describe a dosimetric characterization of the different image acquisition modalities used by the microCT unit of the Albira microPET/SPECT/CT scanner, which is a widely used multimodal imaging system in preclinical research. The imparted dose at the animal surface (IDS) was esti
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21

Bayatiani, Mohamad Reza, Fatemeh Fallahi, Akbar Aliasgharzadeh, Mahdi Ghorbani, Benyamin Khajetash, and Fatemeh Seif. "Determination of effective source to surface distance and cutout factor in small fields in electron beam radiotherapy: A comparison of different dosimeters." Polish Journal of Medical Physics and Engineering 26, no. 4 (2020): 235–42. http://dx.doi.org/10.2478/pjmpe-2020-0028.

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Abstract Objective: The main purpose of this study is to calculate the effective source to surface distance (SSDeff) of small and large electron fields in 10, 15, and 18 MeV energies, and to investigate the effect of SSD on the cutout factor for electron beams a linear accelerator. The accuracy of different dosimeters is also evaluated. Materials and methods: In the current study, Elekta Precise linear accelerator was used in electron beam energies of 10, 15, and 18 MeV. The measurements were performed in a PTW water phantom (model MP3-M). A Semiflex and Advanced Markus ionization chambers and
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McDonald, D., N. Koch, J. Peng, D. Jacqmin, M. Ashenafi, and K. Vanek. "SU-E-T-379: Evaluation of An EPID-Based System for Daily Dosimetry Check by Comparison with a Widely-Used Ionization Chamber-Based Device." Medical Physics 42, no. 6Part18 (2015): 3420–21. http://dx.doi.org/10.1118/1.4924740.

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23

Gupta, S., X. Zhang, E. Han, et al. "SU-E-T-204: Preliminary Study of the Comparison of Patient-Specific QAs Using the Diode and Ionization Chamber Based Dosimetry Systems." Medical Physics 40, no. 6Part13 (2013): 251. http://dx.doi.org/10.1118/1.4814639.

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24

Mamballikalam, Gopinath, S. Senthilkumar, Basith P. M. Ahamed, et al. "Point dose verification of Cranial Stereotactic Radiosurgery using micro Ionization Chamber and EBT3 film for 6MV FF and FFF beams in Varian TrueBeam® LINAC." Polish Journal of Medical Physics and Engineering 26, no. 3 (2020): 135–42. http://dx.doi.org/10.2478/pjmpe-2020-0015.

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AbstractIntroduction: Achieving high positional and dosimetric accuracy in small fields is very challenging due to the imbalance of charged particle equilibrium (CPE), occlusion of the primary radiation source, and overlapping penumbra regions. These factors make the choice of the detector for Stereotactic Radiosurgery (SRS) patient-specific quality assurance (PSQA) difficult. The aim of the study is to compare the suitability of EBT3 Gafchromic film against CC01 pinpoint chamber for the purpose of SRS and stereotactic Radiotherapy (SRT) dose verification.Material and Method: EBT3 Gafchromic f
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Shen, Yichen, Chuanying Zhu, Mawei Jiang, et al. "Scattered Dose to Ovary From Radiotherapy for Neuroblastoma in Female Children." Technology in Cancer Research & Treatment 18 (January 1, 2019): 153303381988798. http://dx.doi.org/10.1177/1533033819887985.

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Purpose: To measure the scattered dose to ovary from radiotherapy for neuroblastoma in female children and to evaluate the relevant risks for radiation-induced ovarian damage. Material and Methods: Radiotherapy for child neuroblastoma was simulated on the water phantom. The scattered dose to ovary is measured by ionization chamber on the linear accelerator with 3-dimensional conformal radiation therapy and intensity-modulated radiation therapy treatment producing 6MV and 10MV X-rays. The treatment planning procedure was carried out on a computer system (TPS, Oncentra). Optimization of the numb
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Abdul Haneefa, K., T. Siji Cyriac, M. M. Musthafa, et al. "FLUKA Monte Carlo for Basic Dosimetric Studies of Dual Energy Medical Linear Accelerator." Journal of Radiotherapy 2014 (July 24, 2014): 1–7. http://dx.doi.org/10.1155/2014/343979.

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General purpose Monte Carlo code for simulation of particle transport is used to study the basic dosimetric parameters like percentage depth dose and dose profiles and compared with the experimental measurements from commercial dual energy medical linear accelerator. Varian Clinac iX medical linear accelerator with dual energy photon beams (6 and 15 MV) is simulated using FLUKA. FLAIR is used to visualize and edit the geometry. Experimental measurements are taken for 100 cm source-to-surface (SSD) in 50 × 50 × 50 cm3 PTW water phantom using 0.12 cc cylindrical ionization chamber. Percentage de
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Promduang, Atchara, Napapong Pongnapang, Napat Ritlumlert, Sutthirak Tangruangkiat, and Monchai Phonlakrai. "A Study of Entrance Surface Air Kerma for Patients Undergoing Chest and Abdomen from Digital Radiography at Chulabhorn Hospital." Journal of Health Science and Medical Research 37, no. 1 (2019): 51. http://dx.doi.org/10.31584/jhsmr.201940.

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Objective: The main purpose of this study was to investigate the typical dose for standard-sized patients in chest (posteroanterior; PA) and abdomen (anteroposterior; AP) digital radiography.Material and Methods: The air kerma was measured by the ionization chamber (Radical Corporation, model 10X6-6) in X-ray equipment manufactured by General Electric Healthcare Definium 8000 System for different kilovoltage peak (kVp) settings in each X-ray examination. The entrance surface air kerma (ESAK) was determined in 422 mediumsized patients in different projections: chest (PA) and abdomen (AP), accor
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Pasquino, Massimo, Valeria Casanova Borca, Paola Catuzzo, Franca Ozzello, and Santi Tofani. "Transmission, Penumbra and Leaf Positional Accuracy in Commissioning and Quality Assurance Program of a Multileaf Collimator for Step-and-Shoot IMRT Treatments." Tumori Journal 92, no. 6 (2006): 511–16. http://dx.doi.org/10.1177/030089160609200608.

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Aims and background The performance characteristics of a commercial multileaf collimator (MLC) for intensity modulated radiation therapy (IMRT) and a comprehensive quality assurance program (QA) to be performed during the commissioning of the MLC were investigated. Materials and methods The midleaf transmission and interleaf leakage, the in-plane penumbra and its in-plane/cross-plane variation, the cross-plane penumbra and its in-plane/cross-plane variation, and the leaf positional accuracy of a high-energy photon (6 MV) Sli Precise Elekta linear accelerator were measured. Kodak EDR2 Ready Pac
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Akino, Yuichi, Shintaro Maruoka, Katsuyuki Yano, et al. "Commissioning of total body irradiation using plastic bead bags." Journal of Radiation Research 61, no. 6 (2020): 959–68. http://dx.doi.org/10.1093/jrr/rraa072.

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Abstract The goal of total body irradiation (TBI) is to deliver a dose to the whole body with uniformity within ±10%. The purpose of this study was to establish the technique of TBI using plastic bead bags. A lifting TBI bed, Model ORP-TBI-MN, was used. The space between the patient’s body and the acrylic walls of the bed was filled with polyacetal bead bags. Patients were irradiated by a 10 MV photon beam with a source to mid-plane distance of 400 cm. The monitor unit (MU) was calculated by dose-per-MU, tissue-phantom-ratio and a spoiler factor measured in solid water using an ionization cham
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Okamoto, Hiroyuki, Akihisa Wakita, Satoshi Nakamura, et al. "Dosimetric impact of an air passage on intraluminal brachytherapy for bronchus cancer." Journal of Radiation Research 57, no. 6 (2016): 637–45. http://dx.doi.org/10.1093/jrr/rrw072.

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Abstract The brachytherapy dose calculations used in treatment planning systems (TPSs) have conventionally been performed assuming homogeneous water. Using measurements and a Monte Carlo simulation, we evaluated the dosimetric impact of an air passage on brachytherapy for bronchus cancer. To obtain the geometrical characteristics of an air passage, we analyzed the anatomical information from CT images of patients who underwent intraluminal brachytherapy using a high-dose-rate 192Ir source (MicroSelectron V2r®, Nucletron). Using an ionization chamber, we developed a measurement system capable o
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Parham, Melton D., Salahuddin Ahmad, and Hosang Jin. "Dosimetric Effect of Biozorb Markers for Accelerated Partial Breast Irradiation in Proton Therapy." International Journal of Particle Therapy 7, no. 4 (2021): 19–28. http://dx.doi.org/10.14338/ijpt-20-00077.1.

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Abstract Purpose To investigate dosimetric implications of biodegradable Biozorb (BZ) markers for proton accelerated partial breast irradiation (APBI) plans. Materials and Methods Six different BZs were placed within in-house breast phantoms to acquire computed tomography (CT) images. A contour correction method with proper mass density overriding for BZ titanium clip and surrounding tissue was applied to minimize inaccuracies found in the CT images in the RayStation planning system. Each breast phantom was irradiated by a monoenergetic proton beam (103.23 MeV and 8×8 cm2) using a pencil-beam
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Sharmin, Meher Nigar, Deepak Shankar Ray, Md Abdul Bari, Md Nazim Uddin, and Md Shakilur Rahman. "Quality Assurance of External Beam Radiotherapy and Results of Participation in IAEA/WHO TLD Inter-comparison program for Radiotherapy Level Dosimetry at Khwaja Yunus Ali Medical College & Hospital in Bangladesh." KYAMC Journal 10, no. 3 (2019): 147–51. http://dx.doi.org/10.3329/kyamcj.v10i3.44418.

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Background: The outcome of the radiotherapy is highly dependent on how precisely dose is delivered to the tumor and should not exceed±5% of the prescribed dose including all types of uncertainties involved in the treatment procedure.
 Objectives: This manuscript describes the comprehensive Quality Assurance (QA) program for two linear accelerators by ensuring Percentage Depth Dose (PDD), Quality Index (QI), Beam Flatness and Symmetry, and beam output consistency at Khwaja Yunus Ali Medical College and Hospital, Sirajganj, Bangladesh. The program is designed according to the policy of the
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Medin, Joakim, Pedro Andreo, Erik Grusell, Olle Mattson, Anders Montelius, and Martin Roos. "Ionization chamber dosimetry of proton beams." Radiotherapy and Oncology 37 (October 1995): S44. http://dx.doi.org/10.1016/0167-8140(96)80601-3.

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Noufal, Manthala Padannayil, Kallikuzhiyil Kochunny Abdullah, Puzhakkal Niyas, and Pallimanhayil Abdul Raheem Subha. "Study of impacts of different evaluation criteria on gamma pass rates in VMAT QA using MatriXX and EPID." Polish Journal of Medical Physics and Engineering 23, no. 4 (2017): 99–107. http://dx.doi.org/10.1515/pjmpe-2017-0017.

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Abstract Aim: This study evaluates the impacts of using different evaluation criteria on gamma pass rates in two commercially available QA methods employed for the verification of VMAT plans using different hypothetical planning target volumes (PTVs) and anatomical regions. Introduction: Volumetric modulated arc therapy (VMAT) is a widely accepted technique to deliver highly conformal treatment in a very efficient manner. As their level of complexity is high in comparison to intensity-modulated radiotherapy (IMRT), the implementation of stringent quality assurance (QA) before treatment deliver
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Stevenson, Andrew W., Jeffrey C. Crosbie, Christopher J. Hall, Daniel Häusermann, Jayde Livingstone, and Jessica E. Lye. "Quantitative characterization of the X-ray beam at the Australian Synchrotron Imaging and Medical Beamline (IMBL)." Journal of Synchrotron Radiation 24, no. 1 (2017): 110–41. http://dx.doi.org/10.1107/s1600577516015563.

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A critical early phase for any synchrotron beamline involves detailed testing, characterization and commissioning; this is especially true of a beamline as ambitious and complex as the Imaging & Medical Beamline (IMBL) at the Australian Synchrotron. IMBL staff and expert users have been performing precise experiments aimed at quantitative characterization of the primary polychromatic and monochromatic X-ray beams, with particular emphasis placed on the wiggler insertion devices (IDs), the primary-slit system and any in vacuo and ex vacuo filters. The findings from these studies will be des
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Karaca, Sibel. "Effect of Changing Phantom Thickness on Helical Radiotherapy Plan: Dosimetric Analysis." Polish Journal of Medical Physics and Engineering 25, no. 2 (2019): 121–26. http://dx.doi.org/10.2478/pjmpe-2019-0016.

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Abstract Purpose: The aim of this study is to investigate the effect of changing phantom thickness on high dose region of interest (HD_ROI) and low dose ROI’s (LW_ROI’s) doses during helical radiotherapy (RT) by utilizing Adaptive RT (ART) technique. Materials and Methods: The cylindrical phantom (CP) is wrapped with different thickness boluses and scanned in the kilovoltage computed tomography (KVCT). HD_ROI and LW_ROI’s were created in contouring system and nine same plans (1.8 Gy/Fr) were made with images of different thicknesses CP. The point dose measurements were performed using ionizati
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Piermattei, Angelo, Luca Grimaldi, Giuseppe D'Onofrio, et al. "In-vivo portal dosimetry by an ionization chamber." Physica Medica 21, no. 4 (2005): 143–52. http://dx.doi.org/10.1016/s1120-1797(05)80003-1.

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Pszona, S., K. Wincel, B. Zaręba, et al. "A novel ionization chamber for dosimetry in intravascular brachytherapy." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 537, no. 3 (2005): 666–71. http://dx.doi.org/10.1016/j.nima.2004.07.291.

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Pszona, S., K. Wincel, B. Zaręba, W. Bulski, P. Ulkowski, and M. Traczyk. "A windowless ionization chamber for soft X-ray dosimetry." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 268, no. 1 (2010): 92–96. http://dx.doi.org/10.1016/j.nimb.2009.09.037.

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Grimaldi, Luca, Guido D'Onofrio, Savino Cilla, et al. "Breast in vivo dosimetry by a portal ionization chamber." Medical Physics 34, no. 3 (2007): 1121–27. http://dx.doi.org/10.1118/1.2426401.

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41

Ten Haken, Randall K., Miguel Awschalom, and Ivan Rosenberg. "Absolute neutron dosimetry: Effects of ionization chamber wall thickness." Medical Physics 12, no. 1 (1985): 46–52. http://dx.doi.org/10.1118/1.595734.

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42

Foroni, R., G. Gambraini, U. Danesi, et al. "New dosimetric approach for multidimensional dose evaluation in gamma knife radiosurgery." Journal of Neurosurgery 93, supplement_3 (2000): 239–42. http://dx.doi.org/10.3171/jns.2000.93.supplement_3.0239.

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✓ During the past two decades, the progress in computerized treatment planning systems has led to more accurate imaging and therapy by using the gamma knife, especially with the smallest collimators (4 mm). However, the ionization chambers that have been used to calibrate the gamma knife are not useful with the smallest collimators because the chambers are too big compared with the irradiated volume. Therefore, it is important to develop more suitable dosimeters. This study proposes a new dosimeter method. The FriXyGel method proposed here is based on a phantom dosimeter, an acquisition chain,
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Matsufuji, Naruhiro, Tetsuharu Matsuyama, Shinji Sato, and Toshiyuki Kohno. "Recombination characteristics of therapeutic ion beams on ion chamber dosimetry." International Journal of Modern Physics: Conference Series 44 (January 2016): 1660218. http://dx.doi.org/10.1142/s2010194516602180.

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In heavy ion radiotherapy, ionization chambers are regarded as a standard for determining the absorbed dose given to patients. In ion dosimetry, it is necessary to correct the radiation quality, which depends on the initial recombination effect. This study reveals for the radiation quality dependence of the initial recombination in air in ion dosimetry. Ionization charge was measured for the beams of protons at 40–160 MeV, carbon at 21–400 MeV/n, and iron at 23.5–500 MeV/n using two identical parallel-plate ionization chambers placed in series along the beam axis. The downstream chamber was us
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Marrale, Maurizio, and Francesco d’Errico. "Hydrogels for Three-Dimensional Ionizing-Radiation Dosimetry." Gels 7, no. 2 (2021): 74. http://dx.doi.org/10.3390/gels7020074.

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Radiation-sensitive gels are among the most recent and promising developments for radiation therapy (RT) dosimetry. RT dosimetry has the twofold goal of ensuring the quality of the treatment and the radiation protection of the patient. Benchmark dosimetry for acceptance testing and commissioning of RT systems is still based on ionization chambers. However, even the smallest chambers cannot resolve the steep dose gradients of up to 30–50% per mm generated with the most advanced techniques. While a multitude of systems based, e.g., on luminescence, silicon diodes and radiochromic materials have
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Wagner, A., F. Crop, T. Lacornerie, F. Vandevelde, and N. Reynaert. "Use of a liquid ionization chamber for stereotactic radiotherapy dosimetry." Physics in Medicine and Biology 58, no. 8 (2013): 2445–59. http://dx.doi.org/10.1088/0031-9155/58/8/2445.

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Bouchard, Hugo, and Jan Seuntjens. "Ionization chamber-based reference dosimetry of intensity modulated radiation beams." Medical Physics 31, no. 9 (2004): 2454–65. http://dx.doi.org/10.1118/1.1781333.

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Stewart, K. J., A. Elliott, and J. P. Seuntjens. "Development of a guarded liquid ionization chamber for clinical dosimetry." Physics in Medicine and Biology 52, no. 11 (2007): 3089–104. http://dx.doi.org/10.1088/0031-9155/52/11/011.

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González-Castaño, D. M., F. Gómez, L. Brualla, et al. "A liquid-filled ionization chamber for high precision relative dosimetry." Physica Medica 27, no. 2 (2011): 89–96. http://dx.doi.org/10.1016/j.ejmp.2010.04.002.

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Wagner, A., F. Crop, T. Lacornerie, F. Vandevelde, and N. Reynaert. "Use of a liquid ionization chamber for small beam dosimetry." Physica Medica 28 (June 2012): S8. http://dx.doi.org/10.1016/j.ejmp.2012.08.033.

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Scarlat, F., A. Scarisoreanu, E. Badita, et al. "Ionization Chamber Dosimetry for Conventional and Laser-Driven Clinical Hadron Beams." Journal of Biosciences and Medicines 03, no. 04 (2015): 8–17. http://dx.doi.org/10.4236/jbm.2015.34002.

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