两种不同高压注射方式CT图像质量的对比研究

目的：讨论使用高压注射器两种不同的增强方式对CT图像质量的影响。方法：全部病例（100例）均使用GE Lightspeed 16排多层螺旋CT和Medrad的Stellant D型高压注射器。对比剂剂量均按4．0ml／s注射造影剂总量80ml．分甲、乙两组行增强扫描。甲组50例，只使用单管注射，不注射生理盐水冲洗；乙组50例，随即注射生理盐水冲洗。评价方式：采用双盲观片法。结果：甲组有放射性伪影，归为阳性例数为40例．比率为80％：无放射性伪影阴性例数是10例，比率为20％。乙组阳性有放射性伪影为24例，比率占48％；阴性例数是26例，比率占52％（P〈0．05）。结论：有生理盐水冲洗的高压注射方式CT图像质量在去除放射性伪影方面有明显优势，而且能够节约造影剂用量。

Contrast Study of CT Image Quality in Two Different High-pressure Syringe Ways

Objective To discuss the consequences of CT image quality in two different contrast enhancement ways of high pressure syringe. Methods 100 cases by using high-pressure syringes of Lightspeed 16-raw spiral CT and Stellant D-type high-pressure syringe of Medrad, the dose of constrast medium was 4.0 ml/s and the total dose was 80 ml, which was divided into A and B group enhancement scanning. The canalis singularis high pressure syringe was used in 50 cases of A group that no isotonic Na chloride flush, in contrast to 50 samples of B group that were underwent the double isotonic Na chloride flush. The method of evaluation is double-blind observation. Results The number of positive is 40 samples which has radioactive constructed defect in A group. The masculine proportion is 80%. The number of the negative is 10 samples. The proportion is 20%. Correspondingly, the number of radioactive constructed defect in the B group is 24 sampies（48%）, and the negative number is 26 samples（52%, P〈0.05）. Conclusion The way of high-pressure syringe with isotonic Na chloride flush has more predominant advantages and the dose of constrast medium can be economized.