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首页> 外文期刊>AJR: American Journal of Roentgenology : Including Diagnostic Radiology, Radiation Oncology, Nuclear Medicine, Ultrasonography and Related Basic Sciences >Evaluation of coronary stents with 64-MDCT: in vitro comparison of scanners from four vendors.
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Evaluation of coronary stents with 64-MDCT: in vitro comparison of scanners from four vendors.

机译：使用64-MDCT评估冠状动脉支架：来自四个供应商的扫描仪的体外比较。

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OBJECTIVE: The purpose of this study was to compare 64-MDCT scanners from four vendors in the in vitro evaluation of coronary artery stents. MATERIALS AND METHODS: Twelve coronary artery stents (nominal outer diameter, 2.5-5.0 mm) oriented in the z-axis were placed in a combined cardiac-chest phantom and imaged with 64-MDCT scanners from four vendors. Quantitative image quality parameters, including artificial in-stent luminal narrowing, image noise, and artificial in-stent luminal attenuation were measured on longitudinal and axial reformations. Imaging of stents with a luminal diameter of 3 mm or less and that of stents with a diameter greater than 3 mm also were compared. RESULTS: Artificial in-stent luminal narrowing was not different among the four vendors (range, 37-42%) on longitudinal reformations. Image noise inside the stent was significantly greater for one vendor (Siemens Healthcare; SD, 48 HU) than for the others (SD range, 21-26 HU) on longitudinal but not on axial images. For the same vendor, artificial in-stent luminal attenuation was significantly lower than for the other vendors. For all vendors, image noise inside the stent was significantly greater on axial than on longitudinal reformations (p < 0.001), and artificial luminal attenuation was significantly greater for all but one vendor (GE Healthcare). Stents 3 mm and narrower had significantly greater artificial luminal narrowing and artificial luminal attenuation (p < 0.05) than those with a diameter greater than 3 mm. CONCLUSION: For longitudinal reformations, scanners from the four leading vendors do not differ in artificial luminal narrowing, but there are differences in artificial luminal attenuation and image noise. The quality of images of the in-stent lumen is better on longitudinal reformations and for stents with a diameter greater than 3 mm. Except for image noise, differences between axial and longitudinal reformations are vendor specific.
机译：目的：本研究的目的是比较来自四个供应商的64-MDCT扫描仪在冠状动脉支架的体外评估中的作用。材料与方法：将十二个沿z轴定向的冠状动脉支架（标称外径2.5-5.0 mm）放置在组合的心胸体模中，并用来自四个供应商的64-MDCT扫描仪成像。在纵向和轴向重建中测量了定量图像质量参数，包括人工支架内腔变窄，图像噪声和人工支架内腔衰减。还比较了管腔直径为3 mm或更小的支架的成像和直径大于3 mm的支架的成像。结果：人工支架内腔狭窄在纵向再造方面在四个供应商之间（范围为37-42％）没有差异。在纵向图像上，一个供应商（Siemens Healthcare; SD，48 HU）在支架内的图像噪声明显大于在其他厂商（SD范围，21-26 HU）的图像噪声，而在轴向图像上则没有。对于同一厂商，人工支架内腔内的衰减明显低于其他厂商。对于所有供应商，支架内部的图像噪声在轴向上要比在纵向整形上要大得多（p <0.001），而除了一个供应商（GE Healthcare）以外，其他人的人工腔内衰减要大得多。与直径大于3毫米的支架相比，直径3毫米或更窄的支架具有更大的人工腔狭窄和人工腔衰减（p <0.05）。结论：对于纵向改革，来自四个主要供应商的扫描仪在人造腔变窄方面没有差异，但是人造腔衰减和图像噪声方面却有差异。在纵向再造和直径大于3 mm的支架上，支架内腔的图像质量更好。除了图像噪声，轴向和纵向重整之间的差异是特定于供应商的。

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