Ultrashort Contrast Enhanced CE MRA

It was used for the morphologic evaluation of cerebral arteriovenous malformations (AVMs). The method was compared with conventional X-ray digital subtraction angiography (DSA) and time-of-flight (TOF) MRA to assess the an-gioarchitecture of the malformations that is essential for treatment planning and follow-up. Contrast-enhanced MRA was able to detect all AVMs seen on DSA, whereas the TOF MRA failed with a very small AVM [23]. However, there was no difference for the detection and delineation of feeding arteries and the AVM. The venous drainage patterns could always be clearly delineated in the CE MRA, whereas TOF MRA could demonstrate the exact venous drainage. Contrast-enhanced MRA was found to be superior to conventional TOF MRA in the assessment of the angioarchitecture of cerebral AVMs especially regarding the assessment of the venous drainage patterns. The superiority was supported by the improved vessel-to-background contrast and contrast-to-noise ratios. The major limitation of this new technique was a low spatial resolution at the used time resolution that could be improved by further sequence modifications. Contrast-enhanced MRA is still an important additional imaging technique for treatment planning and follow-up of AVMs.

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