Multiple spin echo magnetic resonance imaging of the brain.

Advantages of 3D multiecho: 1. High signal to noise ratio which is useful for: a) Long TE b) Short TR c) Thin slices 2. Reduced paradoxical enhancement of blood vessels 3. Contiguous slices 4. Number of slices per scan is not reduced by short TR or long TE 5. Thin slices easily generated 6. A short TR multiecho sequence can produce a spectrum of images reflecting a range of both T1 and T2 weighting in the same scan. This information can often improve specificity. Disadvantages of 3D multiecho: 1. Increased motion sensitivity of 3D acquisitions 2. Scan times increase with TR.