ABSTRACT
Magnetic resonance imaging (MRI), with its superior soft tissue contrast, is the imaging modality of choice for the brain. Imaging sequences exist that make perfusion and diffusion visible, and MRI not only provides a static, structural image, but with limitations provides functional images. Over recent years, both the resolution and the signal-to-noise ratio (SNR) have improved. Contrast, resolution, and SNR have experienced another boost with the wider availability of stronger magnets (often 3 T or higher) and with specialized head coils. Moreover, fast acquisition sequences have been introduced, which can acquire a three-dimensional image of the entire head within minutes.
