摘要
目的：比较64层螺旋CT颈椎采集模式和盆腔采集模式的扫描剂量。材料和方法：选用60例颈椎外伤的患者进行64层螺旋CT检查扫描，并使用水模对比扫描。患者扫描范围180 mm：30例行颈椎模式，30例行盆腔模式；水模扫描范围 30 mm，分别使用两种模式扫描30次。记录患者和水模每次扫描的平均容积剂量指数（CTDIvol）、扫描时间和有效球管电流数值，并计算出剂量长度和平均有效剂量。3名有资质医师双盲法对两组图像质量评分。结果：患者盆腔模式组平均容积剂量<颈椎模式组，盆腔模式组平均有效剂量比颈椎模式组降低59.0%。两组图像质量差异无统计学意义（P>0.05）, 均满足临床要求。水模对比结果相同。结论：64层螺旋CT盆腔模式适合颈椎扫描，辐射剂量小。
Abstract
Objective: To compare the scanning dose of two different acquisition patterns of 64-slice spiral CT in the cervical scan. Materials and Methods: 60 patients with cervical injury were assigned to undergo either cervical pattern(n=30) or pelvis pattern(n=30) scan on a 64-slice spiral CT. A water phantom was scanned 30 times with each acquisition pattern as control(cervical pattern and pelvis pattern). We recorded the average volume CT dose index(CTDIvol), scanning time, effective mAs and calculated the dose-length product(DLP), mean effective dose(E) each time respectively. All images were evaluated by 3 experienced radiologists blindly. Results: The CTDIvol of cervical pattern group was larger than that of pelvis pattern group. The reduction of E value in the group of pelvis pattern is up to 59.0% compared with the group of cervical pattern. There was no significant difference in image quality score between two acquisition pattern groups which was acceptable for clinic need(P>0.05). Conclusion: Considering the optimization of dose, the pelvis pattern of 64-slice spiral CT has lower radiation dose to evaluate the patients with cervical trauma.
关键词
颈椎 /
创伤和损伤 /
体层摄影术 /
螺旋计算机
Key words
Cervical vertebrae /
Wounds and injuries /
Tomography /
spiral computed
李晓娜;彭志刚;马晓晖;崔建岭;孙英彩.
64层螺旋CT颈椎外伤低剂量扫描[J]. 中国临床医学影像杂志. 2012, 23(1): 21-24
LI Xiao-na;PENG Zhi-gang;MA Xiao-hui;CUI Jian-ling;SUN Ying-cai.
64-MSCT low-dose scanning in cervical spine trauma[J]. Journal of China Clinic Medical Imaging. 2012, 23(1): 21-24
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