Clinical Application of Low Dosage Multislice Spiral CT on Mammary Gland Scan

Objective To study the radio dosage accepted by mammary gland and its effect on the picture quality when mA value was decreased in Multislice Spiral CT(MSCT) scanning.Methods 35 focuses among 30 cases checked by molybdenum target were scanned by MSCT at 120 KV,160 mA,50 mA separately.The pictures were double blind diagnosed by two doctors with work experience over 15years.The density,shape and edge of the focus with or without bur and calcification were assessed.Results The radio dosage accepted by mammary gland decreased from 8.7 mGy to 2.72 mGy when the value of mA was decreased from 160 to 50,the declining amplitude was over 68% and there was obvious statistics significance.There was no decline on the picture quality.Conclusions The dosage accepted by subjects decreased obviously under the condition of decline mA.The picture message and picture quality can meet the diagnosis needs although the noise augments.