typical MRA protocol
The specific protocol will vary depending on the particular artery or vein of interest, and the clinical indication. However, imaging sequences that are usually obtained include:
- • Multiplanar heavily T2-weighted images: These are useful to assess the nonvascular structures in the anatomic region of interest and to detect fluid collections.
- • Unenhanced precontrast T1-weighted images: These are useful to detect subacute hemorrhage, which has high T1-weighted signal intensity, and to serve as a baseline of comparison with contrast-enhanced images to assess for presence of enhancement.
- • 3D T1-weighted contrast-enhanced MRA images acquired during the arterial and venous phases of enhancement: These are useful to assess the arteries and, to a lesser extent, the veins in high detail.
- • 2D axial delayed phase contrast-enhanced T1-weighted images: These are useful to assess the veins.
