Article
Engineering, Biomedical
Tarafder Shameem, Nick Bennie, Martin Butson, David Thwaites
Summary: Radiochromic film is a good choice for patient quality assurance in complex treatment techniques. However, there are some challenges, including the Lateral Response Artefact (LRA) effect. This study found that using lenses with longer focal lengths can substantially reduce the LRA effect. This provides an opportunity to design film dosimetry systems that minimize this artefact.
PHYSICAL AND ENGINEERING SCIENCES IN MEDICINE
(2022)
Article
Engineering, Biomedical
Antony L. Palmer, David Nash, Wojciech Polak, Sarah Wilby
Summary: This study evaluated the differences between the new Gafchromic EBT4 film and the current EBT3 film for radiotherapy dosimetry. The results showed that EBT4 had more favorable characteristics for radiation dosimetry compared to EBT3, with improved signal-to-noise ratio. EBT4 provided better agreement with the planned doses and showed equivalent or smaller difference in measured dose compared to EBT3.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Ahtesham Ullah Khan, Jeff Radtke, Clifford Hammer, Julia Malyshev, Brett Morris, Carri Glide-Hurst, Larry Dewerd, Wesley Culberson, Adam Bayliss
Summary: This study investigated the pulse characteristics of a 6 MV photon beam during PRDR irradiations on a commercial linac. The feasibility of using EBT3 radiochromic film for use in IMRT QA was also investigated by comparing its response to a commercial diode array phantom.
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Lei Cheng, Zhe Zhang, Guiyun Liang, Yutong Li
Summary: This study presents the dose-response of HD-V2 to argon ions for the first time, with the relative effectiveness for argon ion beams being about 5%, much lower than that of protons and carbon ions. The darkening efficiency shows dependence on the atomic number and the incident energy of ions.
Article
Optics
Yunxiao He, Wei Hong, Jianfei Hua, Wei Qi, Zhimeng Zhang, Gang Li, Bo Cui, Feng Lu, Zhigang Deng, Shukai He, Jingqin Su, Weimin Zhou, Wei Lu, Yuqiu Gu
Summary: This novel method utilizes the radiochromic effect to measure the fluence distribution of intense short laser pulses, enabling large detection areas and high spatial resolution, suitable for radiochromic films.
Article
Multidisciplinary Sciences
Mattias Klaus Juhl, Binesh Puthen Veettil, Giuseppe Scardera, David Neil Roger Payne
Summary: This paper investigates the use of consumer flatbed scanners for monitoring solar cell precursors, finding that contact image sensors are more suitable. The scanners' ability to monitor texture variation in samples was successfully demonstrated.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Hanano Yamada, Andrew Parker
Summary: Controlled irradiation is necessary for the sterile insect technique, and reliable dosimetry is required for quality assurance. Gafchromic T films have been used for dose mapping and confirmation, and the temperature during irradiation affects the response of these films. New versions of the films released in 2010 show improved temperature response and consistency in the absorption spectrum, simplifying the process of dose measurement.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Kevin Liu, Patrik Goncalves Jorge, Ramesh Tailor, Raphael Moeckli, Emil Schuler
Summary: This study evaluated the performance of Gafchromic EBT3 film under various measurement conditions to simplify but enhance film dosimetry. The results showed that scanning the film within a certain time window and using a standard calibration curve introduced a maximum error of 2% over a dose range of 1-40 Gy. The film response was influenced by the film-read delay, film batch, scanner type, and beam energy.
Article
Chemistry, Physical
Mikaeil Molazadeh, Mostafa Robatjazi, Ghazale Geraily, Hamed Rezaeejam, Ahad Zeinali, Alireza Shirazi
Summary: The study aimed to evaluate the dose distribution of MC code and TiGRT TPS compared to experimental measurements. The results showed a high level of agreement between the calculated dose distributions and experimental measurements, indicating the potential value of 3D film dosimetry in evaluating dose distribution in computing systems.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Engineering, Multidisciplinary
Gerardo Jimenez-Aviles, Miguel Angel Camacho-Lopez, Olivia Amanda Garcia-Garduno, Keila Isaac-Olive
Summary: A readout system for radiochromic film dosimetry was developed using a graphical system design approach, a broadband light-emitting diode, and a webcam. The system works in transmission mode similar to a flatbed scanner and was compared to current clinical protocols. Square samples of 3 cm were irradiated and analyzed for noise, optical density, and uncertainty. The imaging prototype had higher optical density compared to the scanner, with the highest value in the red image channel. The best noise rejection was found in the green channel, and the scanner had the lowest uncertainty.
Article
Nuclear Science & Technology
Maria A. Piliero, Francesco Pupillo, Stefano Presilla
Summary: In this study, the Konica Minolta CM-700d spectrophotometer was characterized as a portable device for radiation dosimetry using EBT3 GAFchromic films. The results showed high stability and reproducibility of colour measurements, with a dose measurement accuracy of 2% and faster readout speed.
RADIATION MEASUREMENTS
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Hugo Bouchard, Ilias Billas, Anna Subiel, Simon Duane
Summary: This study introduces a new multichannel method for correcting systematic thickness disturbances in radiation dosimetry, showing high precision in relevant applications. Utilizing the eigencolor ratio technique, the method efficiently corrects for thickness variations and dark spots that cause errors in single-channel distributions. The proposed method yields standard uncertainties ranging from 0.8% to 1.9% in relative dosimetry, with the potential to achieve uncertainty levels between 0.3% and 0.6% with repeated measurements.
Article
Radiology, Nuclear Medicine & Medical Imaging
Paul. H. Charles, Scott. B. Crowe, Tanya Kairn
Summary: This study calculated the correction factors required when using radiochromic film for small field dosimetry in lung equivalent material, showing that higher correction factors are needed for smaller field sizes and lower densities.
Review
Polymer Science
Muhammad Zamir Mohyedin, Hafiz Mohd Zin, Mohd Zulfadli Adenan, Ahmad Taufek Abdul Rahman
Summary: Recent advances in radiotherapy technology have allowed for precise radiation delivery to cancerous tumors. A 3D dosimeter called PRESAGE, which is based on the radiochromic response of a polymer, has been introduced to verify the accuracy of the treatment. PRESAGE overcomes limitations of previous dosimeters and shows promising applications in advanced radiotherapy treatment verifications.
Article
Radiology, Nuclear Medicine & Medical Imaging
Joseph V. Panetta, Iavor Veltchev, Robert A. Price, C-M Charlie Ma
Summary: This study investigates the effect of dose gradient on quality assurance passing rate in IMRT delivery. The results show that the passing rate is generally correlated to the dose gradient, but the correlation is not predictable and varies with the measurement location.
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Guang Li, Ase Ballangrud, Maria Chan, Ruimei Ma, Kathryn Beal, Yoshiya Yamada, Timothy Chan, James Lee, Preeti Parhar, James Mechalakos, Margie Hunt
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS
(2015)
Editorial Material
Radiology, Nuclear Medicine & Medical Imaging
Maria F. Chan, Chunli (Claus) Yang, Colin G. Orton
Meeting Abstract
Radiology, Nuclear Medicine & Medical Imaging
X. Li, P. Zhang, R. Gewanter, M. Chan, X. Tang, M. Hunt
Meeting Abstract
Radiology, Nuclear Medicine & Medical Imaging
C. Chen, S. Tang, D. Mah, M. Chan
Meeting Abstract
Radiology, Nuclear Medicine & Medical Imaging
X. Tang, Z. Saleh, T. Volpe, R. Margiasso, D. Lovelock, X. Li, M. Chan, M. Hunt, J. Deasy
Article
Radiology, Nuclear Medicine & Medical Imaging
Qinghui Zhang, Weijun Xiong, Maria F. Chan, Yulin Song, Chandra Burman
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
(2015)
Article
Radiology, Nuclear Medicine & Medical Imaging
David F. Lewis, Maria F. Chan
Meeting Abstract
Oncology
G. Li, A. Ballangrud, M. F. Chan, R. Ma, K. Beal, T. A. Chan, Y. Yamada, J. G. Mechalakos, M. A. Hunt
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS
(2014)
Article
Oncology
Maria F. Chan, Gil'ad N. Cohen, Joseph O. Deasy
TECHNOLOGY IN CANCER RESEARCH & TREATMENT
(2015)
Article
Biology
Jiaqi Li, Xile Zhang, Jun Li, Rongtao Jiang, Jing Sui, Maria F. Chan, Ruijie Yang
JOURNAL OF RADIATION RESEARCH
(2019)
Article
Radiology, Nuclear Medicine & Medical Imaging
Lei Zhang, Sarath Vijayan, Sheng Huang, Yulin Song, Tianfang Li, Xiang Li, Elizabeth Hipp, Maria F. Chan, Hsiang-Chi Kuo, Xiaoli Tang, Grace Tang, Seng Boh Lim, Dale Michael Lovelock, Ase Ballangrud, Guang Li
Summary: This study evaluated and compared different system calibration methods for surface-guided frameless cranial stereotactic radiosurgery, establishing a commissioning procedure. Results showed that using the 3D plate calibration method can accurately validate the commissioning procedure, ensuring motion-monitoring accuracy for SRS treatments.
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS
(2021)
Review
Oncology
Maria F. Chan, Claire Young, Daphna Gelblum, Chengyu Shi, Carolanne Rincon, Elizabeth Hipp, Jingdong Li, Dongxu Wang
Summary: This review article consolidates information on existing and emerging implanted devices used in patients undergoing radiation therapy. It categorizes levels of attention needed for each device and emphasizes the importance of monitoring devices that contain electronic circuits and are life-dependent or have adverse effects if overdosed. Proper treatment planning techniques are crucial to minimize dose exposure and assure continued healthy functioning of these devices.
ADVANCES IN RADIATION ONCOLOGY
(2021)
Article
Oncology
Maria F. Chan, Seng-Boh Lim, Xiang Li, Xiaoli Tang, Peng Zhang, Chengyu Shi
TECHNOLOGY IN CANCER RESEARCH & TREATMENT
(2019)
Meeting Abstract
Radiology, Nuclear Medicine & Medical Imaging
J. Li, X. Zhang, J. Li, R. Jiang, J. Sui, M. Chan, R. Yang