^(153)Gd衰减校正对心肌显像的影响

Evaluating the usefulness of ^(153)Gd nonuniform attenuation correction in myocardial imaging

目的 探讨153 Gd非均匀衰减校正系统对心肌模型及心肌断层图像的校正效果。方法应用ADACVertexPlus双探头SPECT仪及153 Gd非均匀衰减校正系统。心肌断层模型内分别充满99TcmO-4370MBq和2 0 1Tl 37MBq。心肌显像患者共 86例 ,其中男 6 4例 ,女 2 2例 ,分别采用和不采用153 Gd非均匀衰减校正。结果 心肌断层模型153 Gd非均匀衰减校正图像与未校正图像的比较分别用目测法和比值法 ,结果表明 :校正图像质量比未校正图像好 ,更能反映真实情况。99Tcm 甲氧基异丁基异腈 (MIBI)的图像校正效果好于2 0 1Tl的图像。临床心肌显像图用目测法比较 :99Tcm MIBI有差异的占 6 0 2 % ,2 0 1Tl有差异的占 5 1.4%。结论 153 Gd非均匀衰减校正系统对心肌图像的校正效果非常明显 ;99Tcm MIBI的分辨率好于2 0 1Tl。

Objective Applying 153 Gd nonuniform attenuation correction system to correct the phantom and myocardial images. Methods Vertex plus double detector SPECT and 153 Gd nonuniform attenuation correction system made by ADAC were used. The phantoms were filled with 99 Tc mO - 4 370 MBq or 201 Tl 37 MBq to test the resolution and uniform of the SPECT. Eighty six patients' myocardial perfusion images were acquired, 64 males and 22 females. The images of models and myocardium were reconstructed with or without 153 Gd nonuniform attenuation correction. Results In the phantom images,the 153 Gd nonuniform attenuation correction offered much better quality of the images by commenting the images with visual observation and the ration of the ROI. In the myocardial images, comparing the images reconstructed with or without nonuniform attenuation correction there were 60 2% of the images appeared different in uniformity while 99 Tc m MIBI was used and 51.4% while 201 Tl was used. Conclusions 153 Gd nonuniform attenuation correction system is quite helpful to the phantom and myocardial image reconstruction, and the resolution of the images with 99 Tc m MIBI is better than that with 201 Tl.