基于定位像的自动管电压选择技术与常规固定管电压技术在胰腺实性病变成像中的比较

发布时间：2019-02-16 05:32

【摘要】：目的比较基于定位像的自动管电压选择技术和固定管电压技术在胰腺实性病变成像中的图像质量和辐射剂量。方法回顾性分析2014年1月至2016年8月在北京协和医院就诊经术后病理证实为胰腺实性病变并行术前双源CT检查的113例患者的临床资料,其中,接受固定管电压(120 kV)和管电流可调扫描患者53例(组1),接受管电压(管电压分档:90、100 kV)和管电流自动调节扫描患者60例(组2)。由2名经验丰富的放射科医生共同测量患者腹围,评估动脉期和门脉期图像的主观图像质量评分及客观图像质量参数,并记录扫描的剂量参数。结果组2的60例患者中,有45例接受90 kV扫描,15例接受100 kV扫描;90 kV组患者的平均腹围为(287±24)mm,明显低于100 kV组的(328±22)mm(t=0.731,P=0.0008)。组2的平均CT容积剂量指数为(3.9±1.0)m Gy,较组1的(9.0±1.9)m Gy降低了56.7%(t=17.5,P=0.0003);平均剂量长度乘积为(109±38)m Gy·cm,较组1的(276±83)m Gy·cm降低了60.5%(t=14.0,P=0.0007)。组2动脉期及门脉期图像的背景噪声标准差分别为(6.4±0.9)和(6.4±1.0)HU,均明显高于组1的(5.6±1.4)(t=-3.757,P=0.0003)和(5.5±1.4)HU(t=-3.828,P=0.0006)。组2动脉期的胰腺病灶、腹主动脉和门脉期的胰腺病灶、门静脉主干的信噪比分别为18.8±9.3、76.0±19.3和17.4±6.7、33.1±7.2,均明显高于组1的13.1±8.7(t=-3.379,P=0.001)、56.5±22.6(t=-2.268,P=0.025)和14.1±8.1(t=-2.283,P=0.024)、28.9±8.8(t=-2.613,P=0.009)。结论基于定位像的第3代双源CT自动管电压选择技术应用于胰腺实性病变时,可减低辐射剂量,而图像质量与第2代双源CT固定管电压技术大致相当。
[Abstract]:Objective to compare the image quality and radiation dose of automatic tube voltage selection technique and fixed tube voltage technique based on localization image in the imaging of pancreatic solid lesions. Methods from January 2014 to August 2016, the clinical data of 113 patients with pancreatic solid lesions confirmed by postoperative pathology and double-source CT examination before operation were analyzed retrospectively. Fixed tube voltage (120 kV) and tube current adjustable scanning were performed in 53 patients (group 1), tube voltage (tube voltage step: 90100 kV) and automatic tube current scanning (group 2). The abdominal circumference of the patients was measured by two experienced radiologists. The subjective image quality scores and objective image quality parameters of arterial and portal phase images were evaluated and the scanning dose parameters were recorded. Results in group 2, 45 patients underwent 90 kV scan and 15 patients underwent 100 kV scan, and the mean abdominal circumference of 90 kV patients was (287 卤24) mm, lower than that of 100 kV group (328 卤22) mm (t 0.731g P 0.0008). The mean CT volume dose index of group 2 was (3.9 卤1.0) m Gy,) lower than that of group 1 (9.0 卤1.9) m Gy) by 56.7%. The average dose length product (109 卤38) m Gy cm,) was 60.5% lower than that in group 1 (276 卤83) m Gy cm). The background noise standard deviation of arterial phase and portal phase in group 2 was significantly higher than that in group 1 (6.4 卤0. 9) and (6.4 卤1. 0) HU, (t = 6. 6 卤1. 4) (t = 3. 757). P0. 0003) and (5. 5 卤1. 4) HU (T- 3. 828) and (5. 5 卤1. 4) HU (T- 3. 828, P0. 0006). The signal-to-noise ratio of the main portal vein was 18.8 卤9.3 卤19.3 and 17.4 卤6.7 卤33.1 卤7.2 in group 2, which was significantly higher than that in group 1 (13.1 卤8.7). P0. 001), 56.5 卤22. 6 (Tu-2. 268 P0. 025), 14. 1 卤8. 1 (t-2. 283 P0. 024), 28. 9 卤8. 8 (t-2. 613, P0. 009). Conclusion the third generation CT automatic tube voltage selection technique based on localization image can reduce the radiation dose of pancreatic solid lesions, and the image quality is approximately the same as that of the second generation dual source CT fixed tube voltage technique.
【作者单位】：中国医学科学院北京协和医学院北京协和医院放射科;
【基金】：国家自然科学基金(81371608) 卫生公益性行业科研专项项目(201402001、201402019)~~
【分类号】：R576;R816.5

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