Results 251 to 260 of about 170,362 (288)

SU‐E‐T‐441: Gamma Passing Rates for IMRT QA and VMAT QA

Medical Physics, 2015
Purpose:This study compares gamma passing rates for a cohort of similar intensity modulated radiotherapy (IMRT) and volumetric modulated arc therapy (VMAT) quality assurance (QA) plans to determine the equivalence of the patient specific QA plan delivery.
E Kremmel, T Giaddui, J Keller, M Fu, C Peng, L Doyle, Y Yu, A Harrison   +7 more
openaire   +1 more source

Correlation between gamma passing rate and complexity of IMRT plan due to MLC position errors

Physica Medica, 2018
This study evaluates the correlation between the susceptibility of the γ passing rate of IMRT plans to the multi-leaf collimator (MLC) position errors and a quantitative plan complexity metric.Twenty patients were selected for this study. For each patient, two IMRT plans were generated using sliding window and step-&-shoot techniques, respectively ...
Yewei, Wang, Xueying, Pang, Lina, Feng, Helong, Wang, Yanling, Bai   +4 more
openaire   +2 more sources

Moving from gamma passing rates to patient DVH-based QA metrics in pretreatment dose QA

Medical Physics, 2011
The purpose of this work is to explore the usefulness of the gamma passing rate metric for per-patient, pretreatment dose QA and to validate a novel patient-dose∕DVH-based method and its accuracy and correlation. Specifically, correlations between: (1) gamma passing rates for three 3D dosimeter detector geometries vs clinically relevant patient DVH ...
Heming Zhen, Benjamin E. Nelms, Wolfgang A. Tomé   +2 more
openaire   +2 more sources

Development of a plan complexity mitigation algorithm based on gamma passing rate predictions for volumetric‐modulated arc therapy

Medical Physics, 2022
AbstractBackground and purposeVolumetric‐modulated arc therapy (VMAT) is a complex rotational therapy technique in which highly conformal dose distribution can be realized by varying the speed of gantry rotation, multileaf collimator (MLC) shape, and dose rate.
Tomohiro, Ono, Mitsuhiro, Nakamura, Yuka, Ono, Kiyonao, Nakamura, Takashi, Mizowaki   +4 more
openaire   +2 more sources

Improvement of prediction and classification performance for gamma passing rate by using plan complexity and dosiomics features

Radiotherapy and Oncology, 2020
The purpose of this study was to predict and classify the gamma passing rate (GPR) value by using new features (3D dosiomics features and combined with plan and dosiomics features) together with a machine learning technique for volumetric modulated arc therapy (VMAT) treatment plans.A total of 888 patients who underwent VMAT were enrolled comprising ...
Hideaki Hirashima, Tomohiro Ono, Mitsuhiro Nakamura, Yuki Miyabe, Nobutaka Mukumoto, Hiraku Iramina, Takashi Mizowaki   +6 more
openaire   +2 more sources

High count rate first-pass radionuclide angiography using a digital gamma camera.

Journal of nuclear medicine : official publication, Society of Nuclear Medicine, 1986
In this study, first-pass radionuclide angiography (FPRNA) was performed using a digital single-crystal gamma camera. Twenty-nine men and six women (ages 43-80, mean 61 yr) underwent FPRNA in the supine position immediately prior to cardiac catheterization.
R, Gal, R P, Grenier, J, Carpenter, D H, Schmidt, S C, Port   +4 more
openaire   +1 more source

Polymer gel dosimeters for pretreatment radiotherapy verification using the three-dimensional gamma evaluation and pass rate maps

Physica Medica, 2017
Polymer gel dosimeters (PGDs) have been widely studied for use in the pretreatment verification of clinical radiation therapy. However, the readability of PGDs in three-dimensional (3D) dosimetry remain unclear. In this study, the pretreatment verifications of clinical radiation therapy were performed using an N-isopropyl-acrylamide (NIPAM) PGD, and ...
Ling-Ling Hsieh, Jiunn-I Shieh, Li-Ju Wei, Yi-Chun Wang, Kai-Yuan Cheng, Cheng-Ting Shih   +5 more
openaire   +2 more sources

Tomotherapy treatment plan quality assurance: The impact of applied criteria on passing rate in gamma index method

Medical Physics, 2013
Purpose:Pretreatment patient plan verification with gamma index (GI) metric analysis is standard procedure for intensity modulated radiation therapy (IMRT) treatment. The aim of this paper is to evaluate the variability of the local and global gamma index obtained during standard pretreatment quality assurance (QA) measurements for plans performed with
Sara, Bresciani, Amalia, Di Dia, Angelo, Maggio, Claudia, Cutaia, Anna, Miranti, Erminia, Infusino, Michele, Stasi   +6 more
openaire   +2 more sources

Evaluation of DVH-based treatment plan verification in addition to gamma passing rates for head and neck IMRT

Radiotherapy and Oncology, 2014
Treatment plan verification of intensity modulated radiotherapy (IMRT) is generally performed with the gamma index (GI) evaluation method, which is difficult to extrapolate to clinical implications. Incorporating Dose Volume Histogram (DVH) information can compensate for this.
Ruurd Visser, David J.L. Wauben, Martijn de Groot, Roel J.H.M. Steenbakkers, Henk P. Bijl, Jeremy Godart, Aart A. van’t Veld, Johannes A. Langendijk, Erik W. Korevaar   +8 more
openaire   +3 more sources

APPLICATION AND COMPARISON OF MACHINE LEARNING ALGORITHMS TO PREDICT VMAT GAMMA PASSING RATES

Physica Medica, 2022
Ms Laura Medina-Bazaco, Mr Carlos Fernández-Leira, Olivia Jordi-Ollero, Victor Hernández, Jordi Saez, Ismael Sancho, Rodolfo de Blas, Francisco Pino, Ignasi Modolell, Roberto Martín-Vaello, Sergio Llácer, Cristina Picón   +11 more
openaire   +1 more source