三维DSA距离测量准确性的模体定量评价研究  

Quantitative evaluation of distance measurement accuracy using phantoms for three-dimensional digital substraction angiography system

作　　者：马国林[1] 刘瑞宏[1] 胡立斌[1] 李传东[1] 

机构地区：[1]卫生部中日友好医院放射科,北京100029

出　　处：《医学影像学杂志》2009年第7期801-804,共4页Journal of Medical Imaging

摘　　要：目的:运用模体定量评估三维DSA距离测量的准确性,以指导临床工作。方法:应用模拟动脉瘤模体和动脉狭窄模体,改变不同的扫描野、重建矩阵、模体方向来研究三维空间距离测量的准确性。通过对模体中球体和圆柱体三维容积重建图像尺寸测量与模体实际尺寸进行对比评估。结果:在三维图像重建中不同的扫描野、重建矩阵、模体方向均能清晰显示圆柱体、球体影像及模拟狭窄的程度。随着扫描野的缩小,对球体直径和狭窄直径的测量精度提高,对于圆柱体长度测量无变化。重建矩阵加大,球体直径测量误差减少(1283最大为0.36mm,2563最大为0.12mm)。圆柱体狭窄百分率测量误差大约为3%。结论:当选用合适的图像成像参数和后处理方法时,利用重建后的三维图像测量动脉瘤的大小和动脉狭窄的程度是相当可靠的。Objective： To quantitativly evaluate the accuracy of three-dimeztsional （3D） distance measurements performed with 3D an giography using various phantoms. Methods：In order to investigate the accuracy of 3D distance measurements, aneurysm phantoms and stenosis phantoms were used. The field of view （FOV） size, reconstruction matrix, and direction of the phantom were changed. The dimensions of the spheres and cylinders were measured on volume rendering （VR） images and compared with the phantoms actual size. Resuits：In different FOV, recortstmcfiort matrixes, and directions of the phantom, the reconstructed 3D images can clearly show the cylinder or the sphere imaging and simulation narrow level. With reducing the FOV, the measurement accuracy of the sphere diameter and narrow diameter improved and the measurement of the cylinder length did not change. With increasing the reconstruction matrix, the measurement error of the spliere diameter decreased （in 1283 reconstruction, the maximum measurement error of sphere diameter was 0.36 mm; in 2563 reconstruction, the maximum measurement error of sphere diameter was 0.12 mm）. The measurement error of cylinder percent stenosis was about 3 %. Conclusion： When using proper imaging parameters and postprocessing methods, measurements of aneurysm size and percent stenosis on the reconstructed 3D angiograms are substantially reliable.

关 键 词：血管造影 颅内动脉 体模研究 三维成像 

分 类 号：R815[医药卫生—放射医学] R543[医药卫生—临床医学]