Medical Physics

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Poster — Thur Eve — 29: Determination of Contrast Agent Concentration in Tortuous Blood Vessels Using Measured MRI Phase Changes and Fourier‐Based Field Inhomogeneity Equations
Medical Physics - Tập 37 Số 7Part2 - Trang 3892-3892 - 2010
Claire Foottit, Greg O. Cron, M. Hogan, TB Nguyen, I Cameron
There has been considerable research effort into obtaining quantitative measures of perfusion using dynamic contrast‐enhanced MRI. Absolute quantification of the arterial input function (AIF) and/or venous output function (VOF) in major blood vessels improves perfusion estimates, however reliable techniques for doing so are lacking. Using changes in phase (Δφ) in blood vessels is thought t...... hiện toàn bộ
Nén hiệu quả hình ảnh y tế 3D cho các can thiệp từ xa thông qua CNN và lọc khuếch tán dị hướng Dịch bởi AI
Medical Physics - Tập 48 Số 6 - Trang 2877-2890 - 2021
Luu Manh Ha, Theo van Walsum, Daniel Franklin, Phuong Cam Pham, Luu Dang Vu, Adriaan Moelker, Marius Staring, Xiem VanHoang, Wiro J. Niessen, Nguyen Linh-Trung
Mục đíchSự nén hình ảnh hiệu quả trong khi vẫn giữ lại chất lượng hình ảnh có khả năng tạo ra bước đột phá lớn cho việc chẩn đoán và điều trị lâm sàng từ xa, vì điều kiện kết nối Internet kém thường là rào cản chính trong các dịch vụ này. Bài báo này trình bày một khuôn khổ nén hình ảnh theo từng cơ quan cho các can thiệp từ xa dựa trên phương pháp học sâ...... hiện toàn bộ
The state of gender diversity in medical physics
Medical Physics - Tập 47 Số 4 - Trang 2038-2043 - 2020
Elizabeth Covington, Jean M. Moran, Kelly C. Paradis
The purpose of this study was to quantify gender diversity in leadership positions within the field of medical physics, as well as within award categories and other recognitions by the American Association of Physicists in Medicine. The April 2019 PDF version of the AAPM membership directory was searched for all users self‐reporting as holding a leadership position at their place of employ...... hiện toàn bộ
Precise ablation zone segmentation on CT images after liver cancer ablation using semi‐automatic CNN‐based segmentation
Medical Physics -
Quoc Anh Le, Xuan Loc Pham, Theo van Walsum, Hang Viet Dao, Tuan Linh Le, Daniel Franklin, Adriaan Moelker, Ha Vu Le, Nguyen Linh-Trung, Luu Manh Ha
AbstractBackgroundAblation zone segmentation in contrast‐enhanced computed tomography (CECT) images enables the quantitative assessment of treatment success in the ablation of liver lesions. However, fully automatic liver ablation zone segmentation in CT images still remains challenging, such as low accuracy and time‐consuming man...... hiện toàn bộ
Comprehensive MRI simulation methodology using a dedicated MRI scanner in radiation oncology for external beam radiation treatment planning
Medical Physics - Tập 42 Số 1 - Trang 28-39 - 2015
E.S. Paulson, Bradley A. Erickson, Chris Schultz, X. Allen Li
Purpose:The use of magnetic resonance imaging (MRI) in radiation oncology is expanding rapidly, and more clinics are integrating MRI into their radiation therapy workflows. However, radiation therapy presents a new set of challenges and places additional constraints on MRI compared to diagnostic radiology that, if not properly addressed, can undermine the...... hiện toàn bộ
Three‐dimensional quadratic modeling and quantitative evaluation of the diaphragm on a volumetric CT scan in patients with chronic obstructive pulmonary disease
Medical Physics - Tập 43 Số 7 - Trang 4273-4282 - 2016
Yongjun Chang, Jang-Pyo Bae, Namkug Kim, Joo‐Young Park, Sang Min Lee, Joon Beom Seo
Purpose:In patients with chronic obstructive pulmonary disease (COPD), diaphragm function may deteriorate due to reduced muscle fiber length. Quantitative analysis of the morphology of the diaphragm is therefore important. In the authors current study, they propose a diaphragm segmentation method for COPD patients that uses volumetric chest computed tomog...... hiện toàn bộ
Anniversary Paper: Evolution of ultrasound physics and the role of medical physicists and the AAPM and its journal in that evolution
Medical Physics - Tập 36 Số 2 - Trang 411-428 - 2009
Paul L. Carson, Aaron Fenster
Ultrasound has been the greatest imaging modality worldwide for many years by equipment purchase value and by number of machines and examinations. It is becoming increasingly the front end imaging modality; serving often as an extension of the physician's fingers. We believe that at the other extreme, high‐end systems will continue to compete with all other imaging modalities in imaging de...... hiện toàn bộ
Radiation therapy dosimetry using magnetic resonance imaging of polymer gels
Medical Physics - Tập 23 Số 5 - Trang 699-705 - 1996
M Maryanski, Geoffrey S. Ibbott, Peter Eastman, R. J. Schulz, John C. Gore
Further progress in the development of polymer gel dosimetry using MRI is reported, together with examples of its application to verify treatment plans for stereotactic radiosurgery and high dose rate brachytherapy. The dose distribution image produced in the tissue‐equivalent gel by radiation‐induced polymerization, and encoded in the spatial distribution of the NMR transverse relaxation ...... hiện toàn bộ
Experimental determination of dosimetric characteristics of Best®125I brachytherapy source
Medical Physics - Tập 27 Số 9 - Trang 2168-2173 - 2000
Ali S. Meigooni, Darren M. Gearheart, Keith Sowards
Monte Carlo modeling of the transverse‐axis dose distribution of the Model 200 interstitial brachytherapy source
Medical Physics - Tập 27 Số 4 - Trang 643-654 - 2000
J.F. Williamson
This study presents the first theoretical analysis of the absolute dose‐rate distribution about the Model 200 interstitial brachytherapy source. Monte Carlo photon‐transport (MCPT) simulation techniques have been used to evaluate the transverse‐axis dose‐rate distribution of the Model 200 source as a function of thickness of the Pd metal coating (containing the plated onto the surfaces of right cylindrical graphite pellets contained within the seed. The dose‐rate constant, Λ, was realistically estimated by simulating the wide‐angle, free‐air chamber (WAFAC) calibration geometry. The WAFAC is the experimental realization of NIST's (National Institute of Standards and Technology) recently implemented primary standard of air‐kerma strength Our results show that polar angle‐ and distance‐dependent oblique filtration and shielding effects induce significant and unexpected photon fluence anisotropy near the transverse‐axis and inverse square law deviations at typical calibration distances. Any source consisting of radioactivity deposited on a highly attenuating surface with sharp edges may exhibit such effects. In the case of the Model 200 seed, the Pd metal thickness does not significantly influence the relative dose distribution in water at distances less than 5 cm, but does make Λ sensitive to the hiện toàn bộ
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