Study on scanning dose and imaging quality of gemstone spectrum imaging during lower extremity arterial CTA / 医疗卫生装备

ABSTRACT

Objective To compare gemstone spectrum imaging (GSI) and auto mA technology for lower extremity arterial CTA to determine whether GSI can decrease radiation dose while increase image quality.Methods Thirty patients were equally divided into a GIS group and an auto mA group.All the patients underwent arterial CTA of both lower limbs.The auto mA group had the noise index (NI) being 15.48 and the current strength range from 20 to 400 mA,and the GSI group applied scanning protocol GSI-36 and 260 mA when used for arterial CTA.The values of CT dose index volumes (CTDIvol) and dose length product (DLP) were recorded,and the effect doses (ED) were calculated.The image quality was evaluated in the two groups,and statistical analysis was carried out.Results GSI and auto mA groups had CTDIvol values being (10.30±40.00) and (9.72±2.86) mGy,DLP values being (1 206.31 ±338.6) and (1 101.4±375.5) mGy· cm,and ED values being (18.10±5.08) and (16.52±5.63) mSv,respectively.The image quality score was (2.87±0.30) in GSI group and (2.57±0.46) in auto mA group,and there were significant difference between the scores (P＜0.05).Conclusion GSI cannot decrease X-ray radiation dose while increase image quality during lower extremity arterial CTA.