Comparison of CTP with MRP imaging
| CTP | MRP |
|---|---|
| CTP advantages | |
| Linear relation of signal changes with contrast concentration; quantitative maps | Nonlinear relation of signal changes with gadolinium concentration; nonquantitative maps |
| Higher spatial resolution | Lower spatial resolution |
| More readily available | Not as readily available |
| MRP advantages | |
| Ionizing radiation | No ionizing radiation |
| Limited z-direction coverage | Whole-brain coverage |
| Iodinated contrast–related concerns | Gadolinium contrast concerns (NSF) |
| Complex postprocessing | Less labor-intensive postprocessing |
Note:—NSF indicates nephrogenic systemic fibrosis; CTP, CT perfusion; MRP, MR perfusion.