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http://dx.doi.org/10.17946/JRST.2015.38.4.16

Evaluation of Image Quality for Various Electronic Portal Imaging Devices in Radiation Therapy  

Son, Soon-Yong (Department of Radiology, Asan Medical Center)
Choi, Kwan-Woo (Department of Radiology, Asan Medical Center)
Kim, Jung-Min (Department of College of Health Science, Radiologic Science, Korea University)
Jeong, Hoi-Woun (Department of Radiological Technology, Baekseok Culture University)
Kwon, Kyung-Tae (Department of Radiological Technology, Dongnam Health University)
Cho, Jeong-Hee (Department of Radiation Oncology, Yonsei Medical Center)
Lee, Jea-Hee (Department of Radiation Oncology, Seoul National University Hospital)
Jung, Jae-Yong (Department of Radiation Oncology, Sanggye Paik Hospital)
Kim, Ki-Won (Department of Radiology, Kyung Hee University Hospital at Gang-dong)
Lee, Young-Ah (Department of Bio-Technologist and Laboratory Animal, Shingu University College)
Son, Jin-Hyun (Department of Radiological Technology, Shingu University College)
Min, Jung-Whan (Department of Radiological Technology, Shingu University College)
Publication Information
Journal of radiological science and technology / v.38, no.4, 2015 , pp. 451-461 More about this Journal
Abstract
In megavoltage (MV) radiotherapy, delivering the dose to the target volume is important while protecting the surrounding normal tissue. The purpose of this study was to evaluate the modulation transfer function (MTF), the noise power spectrum (NPS), and the detective quantum efficiency (DQE) using an edge block in megavoltage X-ray imaging (MVI). We used an edge block, which consists of tungsten with dimensions of 19 (thickness) ${\times}$ 10 (length) ${\times}$ 1 (width) $cm^3$ and measured the pre-sampling MTF at 6 MV energy. Various radiation therapy (RT) devices such as TrueBeam$^{TM}$ (Varian), BEAMVIEW$^{PLUS}$ (Siemens), iViewGT (Elekta) and Clinac$^{(R)}$iX (Varian) were used. As for MTF results, TrueBeam$^{TM}$(Varian) flattening filter free(FFF) showed the highest values of $0.46mm^{-1}$ and $1.40mm^{-1}$ for MTF 0.5 and 0.1. In NPS, iViewGT (Elekta) showed the lowest noise distribution. In DQE, iViewGT (Elekta) showed the best efficiency at a peak DQE and $1mm^{-1}DQE$ of 0.0026 and 0.00014, respectively. This study could be used not only for traditional QA imaging but also for quantitative MTF, NPS, and DQE measurement for development of an electronic portal imaging device (EPID).
Keywords
Modulation transfer function (MTF); Noise power spectrum (NPS); Detective quantum efficiency (DQE); Electronic portal imaging device (EPID);
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Times Cited By KSCI : 5  (Citation Analysis)
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