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KMID : 0357520150380040383
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Journal of Radiological Science and Technology
2015 Volume.38 No. 4 p.383 ~ p.387
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Dose Assessment in Accordance with the Measured Position of Size Specific Dose Estimates
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Kim Jung-Su
Hong Sung-Wan
Kim Jung-Min
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Abstract
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This study investigated the size specific dose estimates of difference localizer on pediatric CT image. Seventy one cases of pediatric abdomen-pelvic CT (M:F=36:35) were included in this study. Anterior-posterior and lateral diameters were measured in axial CT images. Conversion factors from American Association of Physicists in Medicine (AAPM) report 204 were obtained for effective diameter to determine size specific dose estimate (SSDE) from the CT dose index volume (CTDIvol) recorded from the dose reports. For the localizer of mid-slice SSDE was 107.63% higher than CTDIvol and that of xiphoid-process slices SSDE was higher than 92.91%. The maximum error of iliac crest slices, xiphoid process slices and femur head slices between mid-slices were 7.48%, 17.81% and 14.04%. In conclusion, despite the SSDE of difference localizer has large number of errors, SSDE should be regarded as the primary evaluation tool of the patient radiation in pediatric CT for evaluation.
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KEYWORD
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CT dose index, Size estimated, Radiation exposure, Pediatric CT
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