Rubin J I, Gomori J M, Grossman R I, Gefter W B, Kressel H Y
AJR Am J Roentgenol. 1987 Apr;148(4):813-7. doi: 10.2214/ajr.148.4.813.
The MR features of 20 extracranial hematomas studied on a 1.5-T system and imaged with both short repetition-time/echo-time (TR/TE) and long TR/TE pulse sequences were reviewed. In four of five acute hematomas (those less than 7 days of age), signal intensity was markedly decreased on long TR/TE images and was either intermediate or slightly decreased on short TR/TR images. Fourteen subacute hematomas (7 days to 7 weeks of age) and one chronic hematoma (9 months) were studied. The appearance of the subacute lesions varied from intermediate to high intensity on short TR/TE sequences, but all demonstrated increased signal on long TR/TE sequences. A low-signal rim was noted at the margin of nine subacute lesions. In one patient with this finding, pathologic examination showed that the low-signal margin corresponded to a region containing hemosiderin-laden macrophages at the periphery of the hematoma. These results correlate well with those reported for intracranial hematomas examined at this field strength. We conclude that analysis of signal-intensity patterns at 1.5 T is useful in staging the evolution of hematomas.
回顾了在1.5-T系统上研究的20例颅外血肿的磁共振（MR）特征，这些血肿采用短重复时间/回波时间（TR/TE）和长TR/TE脉冲序列成像。在5例急性血肿（年龄小于7天）中，有4例在长TR/TE图像上信号强度明显降低，在短TR/TR图像上呈中等或轻度降低。研究了14例亚急性血肿（7天至7周龄）和1例慢性血肿（9个月）。亚急性病变在短TR/TE序列上的表现从中等强度到高强度不等，但在长TR/TE序列上均显示信号增加。在9例亚急性病变的边缘发现低信号环。在1例有此发现的患者中，病理检查显示低信号边缘对应于血肿周边含铁血黄素巨噬细胞区域。这些结果与在此场强下检查的颅内血肿的报道结果密切相关。我们得出结论，1.5 T时信号强度模式分析有助于对血肿的演变进行分期。
