200kVpX線撮影の検討

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タイトル別名
  • ON ROENTGENOGRAPHY AT 200KVP
  • 200kVp Xセン サツエイ ノ ケントウ

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In general, conventional high voltage roentgenography is performed at maximum voltage of 150kVp. On roentgenography at 200kVp, several investigations already reported were performed by roentgen therapy apparatus. At presents, diagnostic apparatus as 200kVp is available. The apparatus used here is Hitachi X-ray geneator (DR-205) and Philips's rotating anode tube (Super Rotalix 200) with focal spot size of 1.2mm and 0.6mm. The purpose of this paper is to investigate the property of focal spot size and capacity of phototimer (Hitachi Hi-Auto), and to test a new intensifying screen (KYOKKO LT-2) highly sensitive films (Fuji RXS and Sakura QS) at 200kVp roentgenography. 1) The focal spot size of the tube is not changed within the range of 100,150 and 200kVp. 2) Film density of chest roentgenograms taken with the phototimer are sufficiently controled at 200kVp. 3) The quality of images with new screen is compared with those screens HV, FS and VP. Sharpness of VP is superior than that of LT-2 but is difference is small, and less sensitive. HV is more sensitive at 200kVp than LT-2 but image quality is inferior. Quality of FS is almost same as LT-2 but less sensitive. So, it is concluded that the LT-2 is the best at 200kVp roentgenography. 4) Surface dose with sensitive films is reduced to 60 per cent of that with conventional films and image quality is almost same. 5) When filter of 1.0mm Cu+0.5mm Al is added, it is possible to reduce the surface dose less than one third.

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