CT窗技术对于动脉粥样硬化早期斑块诊断的影响

Effect of CT window technique for diagnosis of early atherosclerosis plaque

目的评价CT商技术对动脉粥样硬化（AS）早期斑块诊断的影响方法通过高脂饮食建立兔AS模型，并行CT血管造影，选取2从经大体标本及病理证实粥样硬化斑块弥漫分布于全段主动脉的兔，观察其CT血管造影后的横断㈣闭像（共800幅），应用下列9种显示窗观察图像：（200HU，200HU）、（250HU，200HU）、（300HU，200HU）、（350HU，200HU）、（400HU，200HU）、（450HU，200HU）、（500HU，200HU）、（550HU，200HU）、（600HU，200HU），观察800幅血管横断面图像并记录异常的图像数。利用X^2检验，比较不同显示窗下早期As斑块的显示率及相邻两组之间显示慨率有尢差别。结果窗位一定的情况下（定为200HU），相对窄的窗宽（200—250HU）对于早期斑块显示率高：结论cT窗技术的应用对As早期斑块的显示影响较大。

Objective Evaluation of the effects of CT on early diagnosis of atherosclerosis plaque window tech- nique. Methods By a high-fat diet to establish the rabbit model of atherosclerosis and parallel CT angiography, we only selected 2 confirmed by gross specimens and whose pathological atherosclerotie plaque was distributed in the entire section of the aorta rabbit, observed its cross-sectional CT angiography image （800） , and applied the follow- ing 9 display window observation images ： （ 200 HU, 200 HU）, （ 250 HU, 200 HU）, （ 300 HU, 200 HU）, （ 350 HU,200 HU）, （400 HU,200 HU）, （450 HU,200 HU）, （500 HU,200 HU）, （550 HU,200 HU）, （600 HU,200 HU）. 800 vessels cross-sectional images were observed and the number of abnormal images were recorded. Using test, display rate between the two groups and the adjacent display probability difference of early atherosclerotic plaques was compared under different conditions. Results Under window level in certain circumstances （200 HU）, bandwidth （200 ~ 250 HU） was relatively narrow for the high rate of early plaque. Conclusion CT window technology application shows great influence on early plaque of atherosclerosis plaques.