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目的 探讨18F 脱氧葡萄糖 (FDG)PET发射和透射扫描图像融合对胸部病变的定位价值。方法 对 2 1例胸部肿瘤患者进行18F FDGPET肿瘤显像 ,图像重建后获得透射扫描和衰减校正后发射扫描各断面断层图像。计算机自动生成发射和透射扫描各断面断层图像双肺胸膜轮廓 ,采用表面轮廓匹配法进行图像融合。结果 在PET胸部透射扫描断层图像上可分辨出主动脉弓、气管、肺门大血管、心脏、肺组织、纵隔、胸壁等解剖结构。 2 1例患者在PET和CT图像上均检出的病灶共6 1个 ,与CT图像病灶位置对比 ,除后纵隔近脊柱旁 1个病灶在融合图像上难以定位外 ,余病灶均能正确定位。CT和融合图像相应横断面图像上病变中心点离胸壁前、后径和左、右径距离的平均差值分别为 (2 7± 0 8)、(2 4± 0 9)、(2 9± 0 5 )和 (2 1± 0 4)mm。结论 PET胸部发射和透射扫描图像融合对胸部病变可作出正确定位。PET透射扫描不仅可用于衰减校正 ,还可用于图像融合 ,提供胸部解剖结构信息。
Objective To investigate the value of 18F deoxyglucose (FDG) PET emission and transmission scanning image fusion in the localization of thoracic lesions. Methods Twenty-one patients with thoracic tumors underwent 18F FDG PET tumor imaging. After reconstruction of the images, transmission images and attenuation corrections were obtained and the images of cross-sectional images of each section were taken. The computer automatically generated emission and transmission scans of cross-sectional images of double lung pleural contours, and surface contour matching was used for image fusion. Results The anatomical structures of the aortic arch, trachea, great hilar vessels, heart, lung tissue, mediastinum and chest wall could be discerned on the PET chest transmission scan. A total of 61 lesions were detected on PET and CT images in 21 patients. Compared with the CT image lesion location, except for the posterior mediastinum near the spine, one lesion was difficult to locate on the fusion image, and the other lesions could be correctly located. . The average differences between the distances from the lesion center point to the anterior and posterior diameters of the chest wall and left and right diameters on the cross-sectional images of the CT and fusion images were (2 7 ± 0 8), (2 4 ± 0 9), (2 9 ± 0 5) and (2 1± 0 4) mm. Conclusion The fusion of PET chest emission and transmission scan images can correctly locate the thoracic lesions. The PET transmission scan can be used not only for attenuation correction but also for image fusion, providing chest anatomy information.