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KMID : 0357520160390010099
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Journal of Radiological Science and Technology
2016 Volume.39 No. 1 p.99 ~ p.105
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Comparison of Noise Power Spectrum Methodologies in Measurements by Using Various Electronic Portal Imaging Devices in Radiation Therapy
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Son Soon-Yong
Choi Kwan-Woo
Jeong Hoi-Woun
Kwon Kyung-Tae
Kim Ki-Won
Lee Young-Ah
Son Jin-Hyun
Min Jung-Whan
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Abstract
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The noise power spectrum (NPS) is one of the most general methods for measuring the noise amplitude and the quality of an image acquired from a uniform radiation field. The purpose of this study was to compare different NPS methodologies by using megavoltage X-ray energies. The NPS evaluation methods in diagnostic radiation were applied to therapy using the International Electro-technical Commission standard (IEC 62220-1). Various radiation therapy (RT) devices such as
TrueBeamTM(Varian), BEAMVIEWPLUS(Siemens), iViewGT(Elekta) and ClinacR iX (Varian) were used. In order to measure the region of interest (ROI) of the NPS, we used the following four factors: the overlapping impact, the non-overlapping impact, the flatness and penumbra. As for NPS results, iViewGT(Elekta) had the higher amplitude of noise, compared to BEAMVIEWPLUS (Siemens), TrueBeamTM(Varian) flattening filter, ClinacRiXaS1000(Varian) and TrueBeamTM(Varian) flattening filter free. The present study revealed that various factors could be employed to produce megavoltage imaging (MVI) of the NPS and as a baseline standard for NPS methodologies control in MVI.
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KEYWORD
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Noise power spectrum (NPS) , Electronic portal imaging device (EPID) , Megavoltage X-ray imaging (MVI)
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