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目的：评价信号强度及驰豫时间测量对肺癌的诊断价值。材料和方法：测量了９５例肺癌之癌实体、转移淋巴结及肿瘤继发改变的驰豫时间及信号强度，并将各值用脂肪及肌肉相关值标准化，以评价各变量对肺癌的诊断价值。结果：Ｔ１ＷＩ及Ｔ２ＷＩ第一回波上的信号强度在脂肪或肌肉标准化前后对各种病变均无鉴别意义：Ｔ２ＷＩ后三个回波信号强度及组织驰豫时间在标准化前后均有一定鉴别作用，能够区分的组织主要是胸水、肿瘤坏死及纤维化。对于各种不同组织类型的癌实体之间，癌实体与转移淋巴结之间，癌实体与其继发改变之间几乎每个变量都无法鉴别。但通过信号变化曲线尤其是长回波图像上的信号特点，可以使各病变的差别更直观的表现出来，提高鉴别诊断的可能性。结论：信号强度及驰豫时间的测量虽然可以区分肺癌及部分继发病变，但测量耗时费力且不能提供比肉眼观察更多的诊断信息，临床工作中不宜常规采用，应用价值有限。
Objective: To evaluate the diagnostic value of signal intensity and relaxation time measurement for lung cancer. Materials and Methods: The relaxation time and signal intensity of 95 cases of lung cancer with metastatic changes in metastatic lymph nodes and tumors were measured. The values were normalized with fat and muscle correlation values to evaluate the diagnostic value of each variable for lung cancer. RESULTS: The signal intensity on the first echo on T1WI and T2WI had no discriminating significance before or after normalization of fat or muscle: The signal intensity and tissue relaxation time of the three echoes after T2WI all had a certain discriminating effect before and after standardization. The most distinguishable tissues are pleural effusion, tumor necrosis, and fibrosis. For cancerous entities of various tissue types, between cancerous entities and metastatic lymph nodes, almost every variable between cancerous entities and their secondary changes cannot be identified. However, through the signal change curve, especially the signal characteristics on the long echo image, the differences between the lesions can be more intuitively displayed and the possibility of differential diagnosis can be improved. Conclusion: Although the measurement of signal intensity and relaxation time can distinguish between lung cancer and some secondary lesions, the measurement is time consuming and laborious and can not provide more diagnostic information than the naked eye. It should not be routinely used in clinical work and has limited application value.