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目的:探讨成人颞骨64层螺旋CT低电流扫描的临床应用。方法:东芝64层螺旋CT,其他条件相同(120kV,0.5s/rot,螺距因子HP41)时,用200mA、100mA、50mA、40mA、30mA、20mA、10mA的电流对1具成人尸体头颅标本行颞骨扫描,比较不同电流扫描的图像质量。选取能满足临床需求的最低电流mA值对多个临床中心疑耳疾的400例(800耳)成人颞骨CT检查。评价图像的质量和显示精细结构的情况。结果:标本图像质量保持为优时的最低电流为30mA。用该电流进行颞骨扫描,除4耳(2耳颞骨骨纤维异常增殖症,2耳为硬化型乳突)图像稍差,其余均合格,能满足临床需求。颞骨内各结构显示清晰。CTDIVOL平均为9.6mGy,DLP(55.0±4.5)(mGy.cm),有效辐射剂量(ED)为(0.12±0.07)mSv,仅为常规剂量(200mA)的1/5～1/6。图像噪声标准差平均(SD)132±25。结论:64层螺旋CT颞骨低电流扫描(120kV/30mA)方案能满足临床要求,可以常规用于成人颞骨检查。
Objective: To explore the clinical application of 64-slice spiral CT low current scanning in adult temporal bone. Methods: One adult corpse skull specimen was subjected to 64-slice spiral CT with the same conditions (120kV, 0.5s / rot, pitch factor HP41) at 200mA, 100mA, 50mA, 40mA, 30mA, 20mA and 10mA. Scan to compare the image quality of different current scans. 400 cases (800 ears) of adult temporal bone CT examination of suspicious ailments in multiple clinical centers were selected by the minimum current mA value that can meet the clinical needs. Evaluate the quality of the image and show the fine structure. Results: The minimum current for specimen image quality was 30mA. Using this current for temporal bone scans, the images were slightly worse than 4 ears (2 ear temporal bone fibrous dysplasia, 2 ears sclerosing papillae), the rest were qualified to meet the clinical needs. The structure of the temporal bone showed clear. The mean CTDIVOL was 9.6 mGy with a DLP of 55.0 ± 4.5 mGy.cm and an effective radiation dose of 0.12 ± 0.07 mSv, which was only 1/5 to 1/6 of that of the conventional dose of 200 mA. Image noise standard deviation average (SD) 132 ± 25. Conclusion: 64-slice spiral CT temporal bone scan (120kV / 30mA) can meet the clinical requirements and can be routinely used for adult temporal bone examination.