CT象素矩阵图对鉴别肾上腺的腺瘤与恶性肿瘤的价值

目的：进一步探讨CT象素矩阵图对鉴别肾上腺腺瘤与恶性肿瘤的价值。方法：64例经临床、病理证实的肾上腺肿瘤共73个病灶，肿瘤的平扫平均CT值＞0HU。在CT平扫和增强图像上，分别应用CT象素矩阵图观察肿瘤内有无轻度负CT值区域。结果：在平扫和增强CT象素矩阵图上，分别有77％（24／31）和23％（6／26）的肾上腺腺瘤内见轻度负CT值区域，33例共42个恶性肿瘤病灶均未见此征象，特异性为100％。结论：分析CT象素矩阵图能发现病灶内最小CT值，对鉴别肾上腺的腺瘤与恶性肿瘤具有重要的价值。

Differentiation of adrenal adenomas from malignant tumors using CT pixel mapping

Objective:To evaluate the value of CT pixel mapping to differentiate adrenal adenomas from malignant tumors.Methods:64 patients with 73 adrenal masses confirmed by clinical and pathology were analyzed,the precontrast CT attenuation value of the tumors were greater than 0 HU. On precontrast and postcontrast images, CT pixel mappings were done to detect the area of slight negative CT attenuation value within the tumor.Results:On precontrast and postcontrast CT pixel mapping, 77%(24/31) and 23%(6/26) of adenomas exhibited area of slightly negative CT attenuation values, none of 42 malignant tumors in 33 patients showed this sign, the specificity was 100%.Conclusion:CT pixel mapping can obtain the smallest CT attenuation value of the tumor and is useful in distinguishing adrenal adenomas from malignant tumors.