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KMID : 0357520150380040451
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Journal of Radiological Science and Technology
2015 Volume.38 No. 4 p.451 ~ p.461
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Evaluation of Image Quality for Various Electronic Portal Imaging Devices in Radiation Therapy
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Son Soon-Yong
Choi Kwan-Woo
Kim Jung-Min
Jeong Hoi-Woun
Kwon Kyung-Tae
Cho Jeong-Hee
Lee Je-Hee
Jung Jae-Yong
Kim Ki-Won
Lee Young-Ah
Son Jin-Hyun
Min Jung-Whan
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Abstract
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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) × 10 (length) × 1 (width) cm3 and measured the pre-sampling MTF at 6 MV energy. Various radiation therapy (RT) devices such as TrueBeamTM (Varian), BEAMVIEWPLUS (Siemens), iViewGT (Elekta) and Clinac?iX (Varian) were used. As for MTF results, TrueBeamTM(Varian) flattening filter free(FFF) showed the highest values of 0.46 mm-1and1.40mm-1for 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 1 mm-1DQE 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).
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KEYWORD
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Modulation transfer function (MTF), Noise power spectrum (NPS), Detective quantum efficiency (DQE), Electronic portal imaging device (EPID)
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