Results 211 to 220 of about 85,512 (248)

ROC analysis in patient specific quality assurance

Medical Physics, 2013
Purpose:This work investigates the use of receiver operating characteristic (ROC) methods in patient specific IMRT quality assurance (QA) in order to determine unbiased methods to set threshold criteria forγ‐distance to agreement measurements.Methods:A group of 17 prostate plans was delivered as planned while a second group of 17 prostate plans was ...
Marco, Carlone, Charmainne, Cruje, Alejandra, Rangel, Ryan, McCabe, Michelle, Nielsen, Miller, Macpherson   +5 more
openaire   +2 more sources

Using an EPID for patient‐specific VMAT quality assurance

Medical Physics, 2011
Purpose:A patient‐specific quality assurance (QA) method was developed to verify gantry‐specific individual multileaf collimator (MLC) apertures (control points) in volumetric modulated arc therapy (VMAT) plans using an electronic portal imaging device (EPID).Methods:VMAT treatment plans were generated in an Eclipse treatment planning system (TPS ...
M, Bakhtiari, L, Kumaraswamy, D W, Bailey, S, de Boer, H K, Malhotra, M B, Podgorsak   +5 more
openaire   +2 more sources

Patient-specific radiotherapy quality assurance for estimating actual treatment dose

Medical Dosimetry, 2021
This study aimed to evaluate the optimal method for planning computed tomography (CT) for prostate cancer radiotherapy to avoid a dose difference of ≥3% between the actual and planned treatments using multiple acquisition planning CT (MPCT). We calculated the 3-dimensional (3D) displacement error between the pelvic bone and matching fiducial marker on ...
Yoshinori, Tanabe, Takayuki, Ishida, Hidetoshi, Eto, Tatsuhiro, Sera, Yuki, Emoto, Mototsugu, Shimokawa   +5 more
openaire   +2 more sources

Analysis of ion beam teletherapy patient-specific quality assurance

Medical Dosimetry, 2019
The objective of this study was to evaluate the procedures for patient-specific quality assurance measurements using modulated scanned and energy stacked beams for proton and carbon ion teletherapy. Delivery records from 1734 portal measurements were analyzed using a 3-point pass criteria: more than 22 of 24 chambers in a water phantom (WP) had to have
Xiaoli, Liu, Yu, Deng, Nicki, Schlegel, Zhijie, Huang, Michael F, Moyers   +4 more
openaire   +2 more sources

Patient specific 3D printed phantom for IMRT quality assurance

Physics in Medicine and Biology, 2014
The purpose of this study was to test the feasibility of a patient specific phantom for patient specific dosimetric verification.Using the head and neck region of an anthropomorphic phantom as a substitute for an actual patient, a soft-tissue equivalent model was constructed with the use of a 3D printer.
Eric D, Ehler, Brett M, Barney, Patrick D, Higgins, Kathryn E, Dusenbery   +3 more
openaire   +2 more sources

Patient‐specific quality assurance method for VMAT treatment delivery

Medical Physics, 2009
Volumetric modulated arc therapy (VMAT) is a system for intensity‐modulated radiotherapy treatment delivery that achieves high dose conformality by optimizing the dose rate, gantry speed, and the leaf positions of the dynamic multileaf collimator (DMLC).
Eduard, Schreibmann, Anees, Dhabaan, Eric, Elder, Tim, Fox   +3 more
openaire   +2 more sources

Sensitivity and specificity of time resolved point dose measurements for patient specific quality assurance

Physics in Medicine & Biology, 2018
Abstract This study aimed to quantify the sensitivity and specificity of time-resolved point dose measurements. Criteria were defined to assess whether errors would cause a clinically relevant dose deviation during patient treatment.
Benjamin E W, Scarlet, Andrew J, Williams, Steven, Marsh, Robert J W, Louwe   +3 more
openaire   +2 more sources

Complexity‐based unsupervised machine learning for patient‐specific VMAT quality assurance

Medical Physics
Abstract Background Patient‐specific quality assurance (PSQA) is essential to guarantee the requested accuracy and safety of high‐precision radiotherapy treatments. With the widespread adoption of modulated‐intensity techniques, there is a growing need for increased operational efficiency.
Cilla, Savino, Romano, Carmela, Viola, Pietro, Craus, Maurizio, Macchia, Gabriella, Deodato, Francesco, Morganti, Alessio G   +6 more
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Poster — Thur Eve — 21: ROC analysis in patient specific quality assurance

Medical Physics, 2012
INTRODUCTION: Many institutions rely on a patient specific measurement for IMRT/VMAT patient QA. In diagnostic imaging, radiologists use Receiver Operator Curves (ROC) to help quantify the value of a diagnostic imaging test. The purpose of this work is to investigate the value or ROC methodology for patient specific IMRT QA. METHODS AND MATERIALS: Beam
M, Carlone, C, Cruje, R, McCabe, M, Nielsen, M, Macpherson   +4 more
openaire   +2 more sources

Patient-Specific Quality Assurance

2022
Enrico Clementel, Coreen Corning
openaire   +1 more source