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目的:评价137Cs穿透衰减校正(AC)在氟18F-2-脱氧葡萄糖(18F-FDG)符合显像中对肺癌纵隔淋巴结转移的诊断价值。方法:对54例肺癌纵隔淋巴结转移患者行18F-FDG符合显像,衰减校正采用137Cs点源,分别重建有衰减校正和无衰减校正(NAC)图像。统计肺部及纵隔淋巴结转移病灶的数目,并对两组图像进行比较分析。结果:54例患者AC图像共检出肺部病灶55个,纵隔病灶154个。NAC图像共检出肺部病灶55个,纵隔病灶127个。所有病例中AC与NAC病灶数目相同者31例(57%),AC病灶数目多于NAC者21例(39%),AC病灶数目少于NAC者2例(4%)。AC检出纵隔淋巴结转移病灶而NAC未检出者4例(7%)。结论:AC图像质量明显优于NAC图像,AC对肺部病灶的检出率无明显改善,但对纵隔淋巴结转移病灶的检出率有较大提高。
OBJECTIVE: To evaluate the diagnostic value of 137Cs penetrating attenuation correction (AC) for mediastinal lymph node metastases in lung cancer with 18F-2-deoxyglucose 18F-FDG imaging. Methods: Fifty-four patients with mediastinal lymph node metastasis from lung cancer underwent 18F-FDG coincidence imaging, and 137Cs point source was used for attenuation correction. The attenuation-corrected and non-attenuation-corrected (NAC) images were reconstructed respectively. Statistical lung and mediastinal lymph node metastases the number of lesions, and two groups of images for comparative analysis. Results: A total of 55 pulmonary lesions and 154 mediastinal lesions were detected in 54 patients with AC images. A total of 55 lung lesions and 127 mediastinal lesions were detected in the NAC images. In all cases, 31 (57%) had the same number of AC and NAC lesions, 21 (39%) had more AC lesions than NACs and 2 (4%) had fewer AC lesions than NACs. AC was detected in mediastinal lymph node metastases and NAC were not detected in 4 cases (7%). Conclusion: The quality of AC images is better than that of NAC images. However, the detection rate of pulmonary lesions is not significantly improved by AC, but the detection rate of mediastinal lymph node metastasis is greatly improved.