[Comparative evaluation of absorbed dose and image quality in X-ray head CT scanning for hospital facilities in Gunma.].
Recently, the number of scans for X-ray computed tomography (CT) examinations has been rising due to the wide-spread use of multi-slice CT (MSCT) scanners. There is a concern that the total medical exposures will be increased by these examinations. In order to lower exposures, routine parameters for head CT examinations done at several hospitals in Gunma were investigated. In this study, the computed tomography dose index (CTDI(100, C)), noise, and low contrast resolution were measured. The CTDI(100, C) for all the hospitals exceeded the guideline (40mGy) suggested by the Japan Association of Radiological Technologists (JART). Low contrast resolution showed the coefficient of variation of +/-5% between hospitals. In conclusion, it was proposed that the technologists should reconsider the parameters of the head X-ray CTs, in cases where their output dose far exceeds the standard.
Nagashima
Hiroyuki
H
Department of Clinical Radiology, Gunma Prefectural College of Health Sciences. 323-1 Kamioki-machi, Maebashi-shi, Gunma Pref., 371-0052, Jap. nagashima@gchs.ac.jp.
Shiraishi
Akihisa
A
Ogura
Toshihiro
T
Shimosegawa
Masayuki
M
Kashikura
Kenichi
K
Hoshina
Masao
M
Kawaharada
Yasuhiro
Y
Igarashi
Hitoshi
H
D006257:Head; D006801:Humans; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D015898:Tomography Scanners, X-Ray Computed; D014057:Tomography, X-Ray Computed; D014965:X-Rays