摘要目的 探讨SPECT-CT同机图像融合硬件配准误差的质量评价方法.方法 制作带外套点源、点线模型及用ECT模型,加注放射源后,在床有、无负重情况下,分别对模型进行SPECT-CT采集,然后进行SPECT-CT同机图像融合处理,分析两种图像融合偏差程度.结果 SPECT与CT旋转中心无偏移.在床无负重情况时,点源及点线源与外套无X、Y轴偏移.在床有负重情况下,融合图像Y轴偏移最大值为8.0 mm,X轴偏差无像素偏移.ECT模型可检测核医学"冷"区图像及整体图像融合情况,但不能进行定量测量偏移情况.结论 单点源模型可用于日常简单检测SPECT-CT图像融合硬件配准情况;点线源模型可用于准确定量分析图像融合硬件配匹程度;ECT模型可用图像融合质量综合分析.

abstractsObjective To evaluate the quality control method of the hardware match of hybrid SPECT-CT device.Methods A radioactive dot and a linear array of dots model with shell were made.The SPECT-CT tomography was performed in above two models and ECT Qc model with and without load on scan bed,the two kinds of images were fused and the excusive extent of fusion images between SPECT and CT image was analyzed.Results The rotate center between SPECT and CT device was consistent.The fusion image between the radioactive dot and its shell was no excursion in X and Y axis without the bed load,however.the maximal excursion in Y axis was more than 8.0 mm with bed load.The ECT model could be applied to analyze the image fusion of the radioactive"cold"area images and whole model image with the CT image,but the quantitatively analysis was not available.Condusions A radioactive dot with shell model may be used for the routine test of the fusion images in hybrid SPECT-CT device.A linear array of dots may be used for quantitatively analysis of the image fusion status,and the ECT model may be used for synthetically judge of the fusion image's quality.