PET/CT成像伪影分析

ANALYSIS OF ARTIFACT IN PET/CT IMAGINg

目的分析PET/CT图像伪影产生的原因,探讨其可能预防的措施。方法回顾性分析了南京总医院核医学科1 100例全身PET/CT图像,分析伪影对图像质量的影响程度、伪影的类型、常见及不常见的生理摄取。结果在1 100例患者中,有117例存在伪影,其中33例(28.2%)伪影对临床诊断有影响。依次为呼吸运动伪影50例(42.7%);注射点及放射性污染伪影27例(23.1%);高密度物质伪影19例(16.2%);高血糖肌肉摄取伪影13例(11.1%);体位移动伪影6例(5.1%);口服造影剂伪影2例(1.7%)。结论正确认识伪影并加以消除,有利于提高图像质量,提高影像诊断准确性。

Objective To analyze the causes of PET/CT image artifacts and to discuss the possible preven- tive measures. Methods A retrospective analysis was performed on 1 100 cases who received body PET/ CT image in auhtor＇s hospital. The artifact types, common, uncommon physiological uptake and the degree of influence on image quality were analyzed. Results There were 117 of 1 100 patients presented artifacts, 33 （28. 2%） of them affected clinical diagnostic. Followed by respiratory motion artifacts in 50 cases （42.7%） ; injection site and radioactive contamination artifact were 27 cases （23.1%） ; high density mate- rial artifacts in 19 cases （16.2%）; hyperglycemia muscle uptake artifacts 13 cases （11.1%）; postural mo- tion artifacts 6 cases （5.1% ） ; oral contrast agent artifacts 2 cases （ 1.7% ）. Conclusion Correct under- standing of artifacts and to eliminate them, will help improve the image quality, improve the accuracy of imaging diagnosis.