Medical Physics

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Abnormal lung quantification in chest CT images of COVID‐19 patients with deep learning and its application to severity prediction
Medical Physics - Tập 48 Số 4 - Trang 1633-1645 - 2021
Fei Shan, Yaozong Gao, Jun Wang, Weiya Shi, Nannan Shi, Meisheng Han, Zhong Xue, Dinggang Shen, Yuxin Shi
ObjectiveComputed tomography (CT) provides rich diagnosis and severity information of COVID‐19 in clinical practice. However, there is no computerized tool to automatically delineate COVID‐19 infection regions in chest CT scans for quantitative assessment in advanced applications such as severity prediction. The aim of this study was to develop a deep learning (DL)‐based method for automatic segme... hiện toàn bộ
A dosimetric uncertainty analysis for photon‐emitting brachytherapy sources: Report of AAPM Task Group No. 138 and GEC‐ESTRO
Medical Physics - Tập 38 Số 2 - Trang 782-801 - 2011
Larry A. DeWerd, Geoffrey S. Ibbott, Ali S. Meigooni, Michael G. Mitch, Mark J. Rivard, Kurt E. Stump, Bruce Thomadsen, Jack Venselaar
This report addresses uncertainties pertaining to brachytherapy single‐source dosimetry preceding clinical use. The International Organization for Standardization (ISO) Guide to the Expression of Uncertainty in Measurement (GUM) and the National Institute of Standards and Technology (NIST) Technical Note 1297 are taken as reference standards for uncertainty formalism. Uncertainties in using detect... hiện toàn bộ
Supplement to the 2004 update of the AAPM Task Group No. 43 Report
Medical Physics - Tập 34 Số 6Part1 - Trang 2187-2205 - 2007
Mark J. Rivard, Wayne M. Butler, Larry A. DeWerd, M. Saiful Huq, Geoffrey S. Ibbott, Ali S. Meigooni, Christopher S. Melhus, Michael G. Mitch, Ravinder Nath, Jeffrey F. Williamson
Since publication of the 2004 update to the American Association of Physicists in Medicine (AAPM) Task Group No. 43 Report (TG‐43U1), several new low‐energy photon‐emitting brachytherapy sources have become available. Many of these sources have satisfied the AAPM prerequisites for routine clinical use as of January 10, 2005, and are posted on the Joint AAPM/RPC Brachytherapy Seed Registry. Consequ... hiện toàn bộ
Evaluation of a dual bias dual metal oxide‐silicon semiconductor field effect transistor detector as radiation dosimeter
Medical Physics - Tập 21 Số 4 - Trang 567-572 - 1994
M. Soubra, Joanna Cygler, G. Mackay
A new type of direct reading semiconductor dosimeter has been investigated as a radiation detector for photon and electron therapy beams of various energies. The operation of this device is based on the measurement of the threshold voltage shift in a custom‐built metal oxide‐silicon semiconductor field effect transistor (MOSFET). This voltage is a linear function of absorbed dose. The extent of th... 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 employment, th... hiện toàn bộ
CERR: A computational environment for radiotherapy research
Medical Physics - Tập 30 Số 5 - Trang 979-985 - 2003
Joseph O. Deasy, Angel I. Blanco, V Clark
Analysis of outcomes in radiation oncology: An integrated computational platform
Medical Physics - Tập 36 Số 5 - Trang 1680-1689 - 2009
Dezhi Liu, M. Ajlouni, Jian‐Yue Jin, Samuel Ryu, Farzan Siddiqui, Assem Patel, Benjamin Movsas, Indrin J. Chetty
Radiotherapy research and outcome analyses are essential for evaluating new methods of radiation delivery and for assessing the benefits of a given technology on locoregional control and overall survival. In this article, a computational platform is presented to facilitate radiotherapy research and outcome studies in radiation oncology. This computational platform consists of (1) an infrastructura... hiện toàn bộ
A radiobiological basis for bioeffect planning
Medical Physics - Tập 27 Số 11 - Trang 2637-2637 - 2000
David R. Wigg
The main purpose of this thesis is to encourage the development of bioeffect planning as an experimental tool by which means bioeffect plans may be compared with standard isodose plans. The limitations of isodose planning become apparent in many common clinical circumstances when such comparisons can be made. Most of this thesis addresses the fundamental problems of the derivation of useful biolog... hiện toàn bộ
Comments on “Sampling techniques for the evaluation of treatment plans” [Med. Phys. 20, 151–161 (1993)]
Medical Physics - Tập 20 Số 5 - Trang 1377-1380 - 1993
Andrzej Niemierko, Michael Goitein
Dose–volume distributions: A new approach to dose–volume histograms in three‐dimensional treatment planning
Medical Physics - Tập 21 Số 1 - Trang 3-11 - 1994
A. Niemierko, Michael Goitein
A new approach to calculating and displaying dose–volume relationships in 3D radiation therapy is presented. We have developed a concept of a dose–volume distribution (DVD) and its corresponding differential dose–volume distribution (DDVD), based on organization of the data in the volume rather than in the dose domain. The new concepts make full use of the information that can be obtained from the... hiện toàn bộ
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