MR IAC WO ENT Protocol
History of cholesteatoma?
In addition to the axial DWI, also run the coronal DWI if there is history of cholesteatoma. Use TSE or RESOLVE. Do not use EPI as it causes warp at the skull base.
Sagittal oblique MPRs:
From the T2 sequence, create separate right and left MPRs, each perpendicular to the IAC, at 0.5 mm/0mm, from the midline of brainstem through the semicircular canals.
Last updated: 12/12/23
Charge as: IAC WO
Scanner preference: Avoid MR1. Otherwise 1.5T or 3T
Coil: Head
| Plane | Weighting | Mode | Slice (mm) | Gap (mm) | FAT SAT | FOV (cm) | MPR | Notes |
|---|---|---|---|---|---|---|---|---|
| AXIAL | T2 | 3D TSE | 0.5 | 0 | no | 17 | COR, SAG OBLIQ | Small FOV, F-H about 2.8 cm, centered on IACs. |
| AXIAL | T1 | 3D TSE | 0.5 | 0 | no | 17 | COR, SAG | Small FOV, F-H about 5.2 cm, centered on IACs. |
| AXIAL | DWI | 2D TSE or RESOLVE | 2 | 0.2 | YES | 17 | no | Small FOV, F-H about 5.2 cm, centered on IACs. Send only B1000 & ADC. TSE or RESOLVE (not EPI). |
| optional COR | DWI | 2D TSE or RESOLVE | 2 | 0.2 | YES | 17 | no | Run coronal (in addition to axial) if cholesteatoma. Small FOV. Cover all of temporal bone. Send only B1000 & ADC. TSE or RESOLVE (not EPI). |
