摘要
目的探讨女性胸部CT扫描时,X射线辐射对乳腺的损伤.方法 38例女性患者,使用GE Lightspeed Ultra16层CT机,电压120kV,电流分别选择150mA 、200mA、250mA,螺距0.938或1.375.计算每例胸部扫描层数和乳腺所占的层数;从扫描程序设置栏,记录胸部剂量长度积（DLP）,并依此计算出乳腺DLP.分析mA、层厚、螺距对患者吸收剂量的影响.结果 38例中,胸部平扫层数19～33层,乳腺扫描层数7～16层,乳腺扫描层数和DLP占胸部扫描层数和DLP的27.59%～66.66%.扫描相同范围内,选择不同毫安和螺距对DLP影响较大.结论中等体型女性选择150mA,1.375螺距,7.5mm层厚,能够充分保证图像质量,且DLP相对较低,同时充分利用该机软件功能进行不同方式的重建,图像质量也良好.科学地选择螺距、扫描层数、层厚、mA等参数,能够达到减少患者乳腺接受X射线剂量的目的.
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, choose different mAs and pitch, which exerts a great influence on the DLP. Conclusion Choosing 150mA, 1.375 pitch, 7.5mm layer ca female of moderate bodily form 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 layer, slice and mA scientifically can reduce the quantity of X-ray the breast received.
出处
《中国辐射卫生》
北大核心
2006年第2期158-160,共3页
Chinese Journal of Radiological Health
关键词
乳腺
多层CT
辐射剂量
Female
Chest
Mammary
Multi-layer CT
Radiation Quantity
