李小华 欧阳习 高汝桢 陈盛祖 510010 广州军区广州总医院核医学科(李小华、欧阳习、高汝桢)；中国协和医科大学、中国医学科学院肿瘤医院核医学科(陈盛祖) 中华核医学杂志 1999 0 0 2


    关键词：心脏；体层摄影术；发射型计算机；单光子；病人；移动；质量控制 期刊 zhhyxzz 0 论著 fur -->


    

摘要 目的 探讨双探头SPECT仪心肌灌注断层采集中患者身体移动产生的影响。方法 2只探头置成90°夹角，双探头采集90°，单探头采集180°(关闭1只探头)。心肌灌注断层采集中移动心肌模型模拟患者移动，X和Y分别移动1个、2个和3个像素。采用移动探测软件对原始图像进行移动测试，图像重建后进行靶心图分析。结果 在双探头采集中，Y方向模型的1次移动相当于出现3次移动；X方向的1次移动同样会导致多次移动，但程度与探头平面和X轴的夹角有关。在Y方向，单探头2个像素的移动、双探头1个像素的移动导致靶心图出现心尖计数下降。X方向移动的影响与探头平面和X轴的夹角有明显关系。在实验的2个移动位置中，315°位置1个像素的移动使单探头靶心图的心壁、双探头的心壁和心尖出现计数下降，单探头在270°位置的移动影响较小。结论 双探头心肌灌注采集过程中患者移动的影响比用单探头时显著。

    Effect of patientmotion on dualhead tomographicmyocardial perfusion

LI Xiaohua,OUYANG Xi,GAO Ruzhen,etal.General Hospital of Guangzhoumilitary Command,Guangzhou 510010

Abstract Objective Toevaluate the effect of patientmotion on dual head tomography and the difference betweenthe effects on single and dual head tomography.methods By setting twoheads in 90° orientation,a 90° tomographicmyocardial perfusion imaging was performed ondual head and a 180° was performed on single head (the other one was closed).Duringimaging,amyocardial phantom wasmoved along the X and Y axial direction sequentially at onetime,and covered 1 Pixel,2 Pixels and 3 Pixels,respectively.Raw images were analysed withamotion detection software and reconstructed images were analysed with polarmap.Results ①Motiondetection: in dual head imaging,threemotions were detected on onemotion along Y direction andmulti-motions were also detected on onemotion along X direction but themotion extentwas related to the angle θ between the detector plane and the X direction.②Polarmapanalysis: in Y direction,2 pixelmotion in single head imaging and 1 pixelmotion in dualhead imaging could cause count decrease in apex.In X direction,the effect extent relatedto θ.One pixelmotion at 315° could result in count decrease in wall in single headimaging and in apex and wall in dual head imaging.But at 270°motion the effect was slighton single head imaging.Conclusions The effect of patientmotion on dualhead tomographicmyocardial perfusion ismore striking than that on single head imaging.

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