CT has facilitated early recognition a nd treatment of focal brain injuries in patients with h ead trauma. However.CT shows relatively low sensitivity in identifying nonhemorrhagic contusion and injuries of white matte r MR is known to be supe rior to CT in detection of white matter injuries' s uch as diffuse axonal injury. MR imaging in 14 cases of diffuse a xonal injury on 2.0T was studied. The corpus callosum. especially the body portion. was the most commonly involved site. The lesions ranged from 5 to 20mm in size with ovoid to e lliptical shape. T2WI was the most sensitive pulse sequ ence in detecting lesions su ch as white matter degeneration. h emorrhagic and nonhemorrhagic contu sion.The lesions were nonspecific as high and low signal intensities on T2WI and Tl WI respectively. CT s howed white matter abnormality in only 1 case of 14 cases.We propose MR imaging as the primary imaging procedure for the detection of diffuse axonal injury because of its m 비 tiplanar capabilities and higher sensitivity
Dynamic MRI was performed on 22 patients with extra-axial intracranial tumours. Serial images were obtained every 30 s for 3 min using a spin-echo sequence (TR 200, TE 15 ms) after rapid injection of Gd-DTPA, 0.1 mmol/kg body weight. The contrast medium enhancement ratio (CER) was correlated with the histology of the tumours. Meningiomas and extra-axial metastases showed a sharp rise, then a gradual decline. Although both had a definite early peak of CER, metastases showed a more rapid decline. Neuromas and extra-axial lymphoma showed a slow, steady increase with no peak within 180 s. This study indicates that the CER is helpful in the differentiation of extra-axial tumours.
Dynamic MRI was performed on 22 patients with extra-axial intracranial tumours. Serial images were obtained every 30 s for 3 min using a spin-echo sequence (TR 200, TE 15 ms) after rapid injection of Gd-DTPA, 0.1 mmol/kg body weight. The contrast medium enhancement ratio (CER) was correlated with the histology of the tumours. Meningiomas and extra-axial metastases showed a sharp rise, then a gradual decline. Although both had a definite early peak of CER, metastases showed a more rapid decline. Neuromas and extra-axial lymphoma showed a slow, steady increase with no peak within 180 s. This study indicates that the CER is helpful in the differentiation of extra-axial tumours.
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