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http://dx.doi.org/10.17946/JRST.2016.39.1.12

Comparison of Noise Power Spectrum Methodologies in Measurements by Using Various Electronic Portal Imaging Devices in Radiation Therapy  

Son, Soon-Yong (Dep. of Radiological Technology, Wonkwang Health Science University)
Choi, Kwan-Woo (Dep of Radiology, Asan Medical Center)
Jeong, Hoi-Woun (Dep. of Radiological Technology, Baekseok Culture University College)
Kwon, Kyung-Tae (Dep. of Radiological Technology, Dongnam Health University)
Kim, Ki-Won (Dep. of Radiology, Kyung Hee University Hospital at Gang-dong)
Lee, Young-Ah (Dep. of Bio-Technologist and Laboratory Animal, Shingu University College)
Son, Jin-Hyun (Dep. of Radiological Technology, Shingu University College)
Min, Jung-Whan (Dep. of Radiological Technology, Shingu University College)
Publication Information
Journal of radiological science and technology / v.39, no.1, 2016 , pp. 99-105 More about this Journal
Abstract
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 TrueBeam$^{TM}$(Varian), BEAMVIEW$^{PLUS}$(Siemens), iViewGT(Elekta) and Clinac$^R$ 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 BEAMVIEW$^{PLUS}$ (Siemens), TrueBeam$^{TM}$(Varian) flattening filter, Clinac$^{R}$iXaS1000(Varian) and TrueBeam$^{TM}$(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.
Keywords
Noise power spectrum (NPS); Electronic portal imaging device (EPID); Megavoltage X-ray imaging (MVI);
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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