Research on breast damage of women after chest multi-layer CT scanning

Objective: To discuss the breast damage caused by the x-ray scanning. Methods: To calculate the chest and breast scanning layers of every case with GE 16 layer-CT machine on 38 female patients, choosing voltage 120 KV, electric current 150 mA, 200 mA, 250 mA and pitch 0.935 or 1.375. then calculate the chest and breast scanning layers of every case, register the bar, where the scan program can be set, record the DLP and work out the DLP of the breast according to data noted above. Meanwhile, analyze the influence of mA, layer, pitch on DLP. Results: In the 38 cases, plane scanning layers of chest range from 19 to 33, and breast from 7 to 19, with the latter accounting for 27.59%-66.66% of the former. So was the DLP. When scanning the same ranges, chose different mAs and pitch, which exerts a great influence on the DLP. Conclusion: Choosing 150 mA, 1.375 pitch, 7.5 mm layer on female of moderate bodily from can guarantee the quality of the picture sufficiently and a relative lower DLP. At the same time, make a good use of its software to rebuild in a variety of ways. Also, a better quality picture can be received. Choosing the parameters such as pitch, numbers of scan layers, slice and mA scientifically can reduce the quantity of X-ray the breast received. (authors)