Browse > Article
http://dx.doi.org/10.17946/JRST.2016.39.2.06

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

Kim, Ki-Won (Department of Radiology, Kyung Hee University Hospital at Gang-dong)
Choi, Kwan-Woo (Department of Radiology, Asan Medical Center)
Jeong, Hoi-Woun (Department of Radiological Technology, Baekseok Culture University)
Jang, Seo-Goo (Department of Medical Science, Soonchunhyang University)
Kwon, Kyung-Tae (Department of Radiological Technology, Dongnam Health University)
Son, Soon-Yong (Department of Radiological Technology, Wonkwang Health Science University)
Son, Jin-Hyun (Department of Radiological Technology, Shingu University)
Min, Jung-Whan (Department of Radiological Technology, Shingu University)
Publication Information
Journal of radiological science and technology / v.39, no.2, 2016 , pp. 171-176 More about this Journal
Abstract
The quality assurance (QA) is very important for diagnostic field and radiation therapy field to evaluate the characteristic of devices. The purpose of this study was to compare different NPS methodologies results which are measuring NPS with regard to horizontal and vertical directions by using megavoltage X-ray energies. The NPS evaluation methods were applied to the International Electro-technical Commission standard (IEC 62220-1). The electronic portal imaging devices (EPID) devices such as Siemens BEAMVIEW$^{PLUS}$, Elekta iViewGT and Varian Clinac$^R$ iX aS1000 were used. NPS data were expressed by corresponding each frequency about average of noise value corresponding the each frequency, and NPS were evaluated quantitatively by totaling up the noise values of average frequency which are on horizontal and vertical directions. In NPS results for Elekta iViewGT, NPS of horizontal and vertical by using 4 methods were indicated the difference of 3~5% between horizontal and vertical direction. In the results of Siemens BEAMVIEW$^{PLUS}$ and Varian Clinac$^R$ iX aS1000, the NPS of horizontal and vertical direction were indicated the difference of 15% when averaging the whole values. This study were evaluated the NPS of each devices by totaling up the noise values of average frequency which are on horizontal and vertical directions suggesting the quantitative evaluation method using the data.
Keywords
Noise power spectrum (NPS); Electronic portal imaging device (EPID); Quality assurance (QA);
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 Hoi-Woun Jeong, Jung-Whan Min, Jung-Min Kim et al: Performance characteristic of a Cs I (TI) Flat panel detector radiography system. Journal of Radiological Science and Technology, 35(2), 109-117, 2012
2 Jung-Min Kim, Jung-Whan Min, Hoi-Woun Jeong et al: Correction Method of slit Modulation Transfer function on Digital Medical Imaging System. Journal of Radiological Science and Technology, 29(3), 133-139, 2006
3 Soon-Yong Son, Hoi-Woun Jeong, Jung Whan Min et al: Comparison of noise power spectrum methodologies in measurements by using Various Electronic Portal Imaging Devices in Radiation Therapy. Journal of Radiological Science and Technology, 39(1), 97-104, 2016
4 Soon-Yong Son, Hoi-Woun Jeong, Jung Whan Min et al: Evaluation of Image Quality for Various Electronic Portal Imaging Devices in Radiation Therapy. Journal of Radiological Science and Technology, 38(4), 451-461, 2015   DOI
5 Soon-Yong Son, Hoi-Woun Jeong, Jung Whan Min et al: Measurement of Image Quality According to the Time of Computed Radiography System. Journal of Radiological Science and Technology, 38(4), 365-374, 2015   DOI
6 Gopal A, Samant SS. Use of a line-pair resolution phantom for comprehensive quality assurance of electronic portal imaging devices based on fundamental imaging metrics. Med Phys 36, 2006-2015 2009   DOI
7 Sawant A, Antonuk LE, El-Mohri Y. Slit Design for Efficient and Accurate MTF Measurement at Megavoltage X-ray Energies. Med Phys 34, 1535-1545, 2007   DOI
8 Dobbins III JT, Samei E, Ranger NT, et al: Intercomparis on of methods for image quality characterization. II. Noise power spectrum. Med Phys 33, 1466-1475, 2006   DOI
9 Seibert JA, Bogucki TM, Ciona T, Huda W, Karellas A, Mercier JR, et al. Report of AAPM Task Group 10, 1, 2006
10 IEC (International Electrotechnical Commission), IEC 62220-1 (2003)
11 Cho HM, Kim HJ, Lee CL, et al: Imaging characteristics of the direct and mobile indirect digital radiographic systems. Proc IEEE M19-199, 3840-3846, 2007