Dose Reduction by Body Mass Index: Different Protocol in low-Dose Chest Computed tomography Cho Ah-Ram1, Kim Jin-Woo1, Lee Eun-Seong1, Han Su-Chul2, Lim Cheong-Hwan1, Jung Hong-Ryang1 1Dept. of Radiological Science, Hanseo University 2Division of Medical Radiation Equipment, Korea Institute of Radiological & Medical Sciences, Korea Online published on 14 May, 2018. Abstract We investigated the effects of exposure involving reduction of automatic exposure control value based on body mass index and image quality using the AAPM phantom in low-dose computed tomography (CT). The study was carried out on subclinical, normal persons without lung diseases among students in a single university. The examination was the same as the phantom experiment. Scan protocol conditions in the phantom study were always tube voltage 120 kVp, 30 mA tube current, 0.5 sec rotation time, 360 mm field of view, and dose modulation (Fixed, D-DOM, Z-DOM, D-DOM+automatic current selection (ACS), Z-DOM+ACS). Comparison and analysis was based on D-DOM. In the fixed mode, the volume CT dose index (CTDIvol) and dose length product (DLP) value was 1.94 mGy and 26. 2 mGy·cm, respectively. In D-DoM the respective values were 1.47 mGy and 20.1 mGy·cm. For D-DoM+ACS, the respective values were 1.70 mGy and 23.2 mGy·cm, and the CTDIvol value of Z-DoM and DLP was 1.82 mGy and 24.9 mGy·cm, respectively. For Z-DoM+ACS together, CTDIvol was 2.22 mGy and DLP was 30.4 mGy·cm; in case of ACS, CTDIvol was 2.46 mGy and DLP was 33.2 mGy·cm. Improvement of exposure dose and the image quality of obese patients could result using a protocol that offers more appropriate image quality and minimum dose Top Keywords BMI, chest CT Dose Reduction. Top |