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目的：探讨正常心肌灌注显像放射性稀疏区的成因。材料与方法：对５例猪心行~９９ｍＴｃ－ＭＩＢＩ在体和离体心肌灌注显像，并用ＲＯＩ技术测量左室各部位心肌的放射性水平（计数／像元），由该值在两种状态下的差值计算衰减程度（％）。结果：两种状态间壁后部和后壁放射性水平最低；在体心肌前壁中段衰减程度（７．９％）高于其前段和后段，该区衰减程度与胸壁厚度呈正相关；后壁衰减程度最高（１１．９％）。结论：胸壁是造成前壁中段稀疏影的原因，隔肌是形成后壁稀疏影的重要原因之一。心肌图像重建时可根据衰减程度作适当补偿。
Objective: To investigate the causes of radioactive sparse area in normal myocardial perfusion imaging. Materials and Methods: The myocardial perfusion imaging of 99mTc-MIBI in 99 pig Tc-MIBI was performed in 5 pigs. The radioactivity level (count / Pixel) of myocardium in all parts of left ventricle was measured by ROI technique. Under the difference calculation of the degree of attenuation (%). Results: The radioactive level was the lowest in the posterior and posterior walls of the two states. The attenuation in the middle segment of the anterior myocardium (7.9%) was higher than that in the anterior segment and the posterior segment. The degree of attenuation was positively correlated with the thickness of the thoracic wall. The posterior wall attenuation The highest degree (11.9%). Conclusion: The chest wall is the cause of sparse shadow in the middle of the anterior wall. The diaphragm is one of the important reasons for the sparse shadow of posterior wall. Myocardial image reconstruction according to the degree of attenuation for appropriate compensation.