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CT增强检查的目的是在于提高肿瘤分期的检出率,经过增强扫描,可以发现病灶于实质或周围组织的强化程度往往不一致,两组密度水平差异较大,通过增强扫描可以发现平扫时可能遗漏的病灶。平扫时各种病灶的密度或密度差异较小,与血管断面影区分较为困难,尤其是脑、肝、胰、脾、肾等实质性脏器内的小病灶属于实质性占位,很多时候平扫图像上的密度差异很小,仅仅靠平扫难免出现漏诊或误诊的情况,说明了CT增强扫描的重要性。
The purpose of CT enhancement examination is to improve the detection rate of tumor staging. After enhanced scanning, it is found that the enhancement degree of the lesion in the real or surrounding tissue is often inconsistent, and the density difference between the two groups is quite different. Missing lesions. Differences in density or density of various lesions during plain scan are relatively small and it is difficult to distinguish them from the blood vessel profile. In particular, small lesions in the parenchyma such as brain, liver, pancreas, spleen and kidney belong to substantial occupancy. In many cases Differences in density on plain images are minimal, and missed or misdiagnosed conditions are unavoidable only by plain scan, demonstrating the importance of enhanced CT.