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目的评价宝石CT(HDCT)显示冠状动脉支架的能力,并与64层螺旋CT进行比较。方法 52例患者(共放置85个支架)进行64层螺旋CT和HDCT扫描,分别测量支架内CT值和相邻未放置支架节段的CT值,同时测量支架内径,并对两者进行比较。结果在HDCT上,支架内腔的显示率明显高于64层螺旋CT(分别为69.0%和42.9%,P<0.01)。支架内CT值的上升值分别为15.2 HU和54.2 HU(P<0.01)。结论由于空间分辨率的提高以及有效抑制线束硬化伪影,HDCT与64层螺旋CT比较,提高了支架内腔的可视度,能更准确测量支架的内径。
Objective To evaluate the ability of gemstone CT (HDCT) to display coronary stents and to compare with 64-slice spiral CT. Methods Fifty-two patients (85 stents were placed in total) were examined by 64-slice spiral CT and HDCT. The CT values of the stent and the CT values of adjacent stents were measured. The stent internal diameters were also measured and the two were compared. Results In HDCT, the rate of stent lumens was significantly higher than 64-slice spiral CT (69.0% and 42.9%, respectively, P <0.01). The increase of CT values in the stent was 15.2 HU and 54.2 HU respectively (P <0.01). Conclusion Compared with 64-slice spiral CT, the HDCT improves the visibility of the stent lumen and can more accurately measure the inner diameter of the stent due to the improvement of spatial resolution and effective suppression of hardened harden artifacts.