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目的：比较IQ·SPECT和LEHR·SPECT两种技术在心肌模型显像中对重建图像质量的影响。方法采用IQ·SPECT和LEHR·SPECT两种技术进行心肌模型显像，研究不同采集时间下的重建图像质量，并对模型图像的噪声和各壁段的放射性计数百分比进行比较分析。结果：①随着每帧采集时间的延长，重建图像的噪声逐渐减少，“冷区”的放射性计数百分比逐渐减小；②当每帧采集时间相同时，IQ·SPECT所重建出的图像比LEHR·SPECT所重建出的图像噪声小，而且“冷区”的放射性计数百分比小。结论 IQ·SPECT技术比LEHR·SPECT技术采集效率高，图像质量明显提高。“,”Objective To investigate the inlfuence of application of IQ·SPECT (Single-Photon Emission Computed Tomography) and LEHR·SPECT on myocardial perfusion imaging.Methods The phantom of myocardial was used for comparison between IQ·SPECT and LEHR·SPECT after routine acquisition and image reconstruction. Then, the influence of application of different acquisition time on the quality of images was analyzed.Results With the extension of the acquisition time for each frame, the noise of the reconstructed image was reduced gradually, and the percentage of the radioactivity in the cooling zone was also decreased gradually. For the phantom image with same acquisition time, IQ·SPECT demonstrated superiority over LEHR·SPECT in its smaller image noise and percentage of the radioactivity in the cooling zone.Conclusion For myocardial perfusion imaging, application of IQ·SPECT could obtain higher-quality images with high-efifciency acquisition.