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KMID : 0357520070300040381
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Journal of Radiological Science and Technology
2007 Volume.30 No. 4 p.381 ~ p.389
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A Study on the Radiation Dose in Computed Tomographic Examinations
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Lim Cheong-Hwan
Cho Jung-Keun
Lee Man-Koo
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Abstract
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The purpose of this study is investigation of radiation dose in CT scan. Data were collected from various references and organizations. Doses measured by CT scanners of each medical organization were analyzed and they were calculated through the examination protocol. The results are as follows : 1. value per 100mAs measured by Head Phantom was the highest in <4-slice MDCT scanner> of 24.20 mGy. values were significantly different among scanner generations(p < 0.01). 2. value per 100 mAs measured using body phantom was the highest in <4-slice MDCT scanner> of 13.58 mGy and the values were significantly different among scanner generations(p < 0.01). 3. When contrast medium was not used, the highest scanner was <16 slice MDCT> of in exposure dose in brain scan(p < 0.05). When the contrast medium was used, the highest scanner was <4 slice MDCT> and its average was (p < 0.1). 4. When the contrast medium was not used, the highest scanner was <16-slice MDCT> of on average in terms of the exposure dose in chest inspection(p<0.05). when the contrast medium was used, the highest scanner was found in 8 slice MDCT scanner and its average was . There was no statistically significant difference among scanners. 5. When the contrast medium was not used, the highest scanner was <16-slice MDCT> and its average was in exposure dose on the abdomen-pelvis(p<0.05). when the contrast medium was used, the highest scanner was <16-slice MDCT> and its average was on average (p < 0.05). 6. When the contrast medium was not used, the highest scanner was <8-slice MDCT> and its average was in exposure dose in liver inspection(p < 0.05). when the contrast medium was used, the highest scanner was <8-slice MDCT scanner> and its average was in exposure dose(p < 0.1). seventy six point two percent of medical facilities were in risk of radiation exposure while the number of phase was three to four times in their dose inspection of contrast medium.
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KEYWORD
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Computed Tomography, CT dose, CTDI, DLP
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