Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)
- Volume 16 Issue 1
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- Pages.101-106
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- 1993
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- 2288-3509(pISSN)
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- 2384-1168(eISSN)
Measurement of Focal Spot Size of Heavy Loaded X-ray Tubes
X선관의 실효초점 측정에 관한 고찰
- Chang, Kwang-Hyun (Department of Diagnostic Radiology, Seoul National University Hospital) ;
- Lim, Oh-Soo (Department of Diagnostic Radiology, Seoul National University Hospital) ;
- Kim, Hyung-Kee (Department of Diagnostic Radiology, Seoul National University Hospital) ;
- Song, Chang-Wook (Department of Diagnostic Radiology, Seoul National University Hospital) ;
- Cheung, Kyung-Mo (Department of Diagnostic Radiology, Seoul National University Hospital) ;
- Cheung, Hwan (Department of Diagnostic Radiology, Seoul National University Hospital)
- 장광현 (서울대학교병원 진단방사선과) ;
- 임오수 (서울대학교병원 진단방사선과) ;
- 김형기 (서울대학교병원 진단방사선과) ;
- 송창욱 (서울대학교병원 진단방사선과) ;
- 정경모 (서울대학교병원 진단방사선과) ;
- 정환 (서울대학교병원 진단방사선과)
- Published : 1993.05.22
Abstract
In order to assure safety of both patient and operator, and to provide uniform quality radiographs, it is necessary to perform periodic calibration of diagnostic X-ray equipment. A basic parameter of diagnostic equipment's and its image sharpness is the size(and shape the energy distribution) of the focal spot as viewed along the central X-ray beam. This size determines the resolution possible with the equipment and also determines the heat characteristics of an anode. A fine focus tube gives high resolution but causes high local heating of target. In past, the pin-hole and star pattern image measurement for evaluation of resolution have been widely used, but it produced blurring and inaccuracy of image. So newly inverted Ug-meter has advantage in more convenient measurement method and less out-put bias than other image measurement. The authors intended to compare measured focal size between Ug-meter and focal spot test tool, changed state from setting to now of units.
Keywords