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KMID : 0974620000180020033
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Bulletin of Dongnam Health University
2000 Volume.18 No. 2 p.33 ~ p.39
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A Study on the Exposure Factor of Chest P-A Radiography
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Abstract
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This study was carried out to investigate the operating conditions of X-ray units and exposure factor of chest P-A radiography on the 80 medical facilities in Kyong gi do from July 1 in 1999 to January 31 in 2000. As a result of this study, main finding were as follows
1. The rectification method of the generator were used mainly single phase full wave in 80%, three phase full wave and inverter type in 14%
2. Maximum ratings of X-ray tubes were 48% at 125 kVp maximum tube voltage and 36% at 150 kVp. The maximum tube current higher than 500mA were shown in 78% of all the examined.
3. In most medical facilities, tube voltage lower than 100 kV was used and 13% of the medical facilities high tube voltage higher than 100kV was used.
4. The exposure time was used lower than 0.05sec in 33% and 83 % of all the X-ray units used tube current rangeing form 500 to 800 mA.
5. The added filter was not used in the 81% of all the facilities and used 58% of the grid ratio at 8:1.
6. The orthochromatic system was only used in 17% of screen/film system.
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