Dynamic contrast enhancement of XXXX of the head and neck: evaluation with time-resolved 2D MR projection angiography.

@entity5 @entity1 @entity1823
Our objective was to evaluate @entity5 hemodynamics of @entity1823 of the head and neck. A 2D magnetic resonance projection angiography (MRPA) protocol was developed. Six @entity1 with histologically proven @entity1823 were included in the study. The sequence protocol and data post-processing procedure were optimized in view of a high temporal resolution and maximum contrast-to-noise ratio. Image-time series of two freely orientated slabs could be obtained. Correlation analysis was performed to generate selective arterial and venous weighted angiographic images. @entity5 showed a rapid and intense homogeneous enhancement following the intravenous administration of contrast material. The smallest tumors investigated measured 10 mm and could be visualized clearly. Time-resolved analysis of the @entity5 enhancement revealed an early bolus arrival within the vascular bed of the @entity5 and prolonged incomplete washout indicating blood pooling. The dynamic contrast enhancement of @entity5 can be evaluated non-invasively with MRPA providing a high temporal resolution and high image quality. The characteristic contrast enhancement of @entity5 can be helpful in the diagnostic workup of lesions that may mimic @entity5 .
