Evaluation of the quality control methods of image fusion in hybrid SPECT-CT device

Objective 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. Key words: Model;  Image fusion;  Quality control;  SPECT-CT