MR IAC & Brain WWO
History of cholesteatoma?
Only run the small FOV axial DWI of the IACs 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 small FOV axial T2 sequence of the IACs, create separate right and left MPRs, each perpendicular to the IAC, at 0.5 mm/0mm, from midline of the brainstem through the semicircular canals.
Other notes:
Last updated: 1/25/22
Charge as: IAC WWO & Brain WWO
Scanner preference: Avoid MR1
Coil: Head
| Plane | Weighting | Mode | Slice (mm) | Gap (mm) | FAT SAT | FOV (cm) | MPR | Notes |
|---|---|---|---|---|---|---|---|---|
| WHOLE BRAIN: | ||||||||
| AXIAL | DWI | EPI | 3 | 0.3 | YES | 23 | no | Angle to Corpus. Cover Skull Base to Vertex. Send only B1000 & ADC. |
| AXIAL | T2 | 3D TSE | 1 | 0 | no | 23 | no | NO ANGLE. Cover at least 1cm above vertex through skull base. Cover entire nose. |
| AXIAL | SWI | 3D GRE | 2 | -1 | no | 23 | no | Angle to Corpus. Cover skull base to vertex. Ok to add slices. Run Ven Bold on MR1 and MR2. |
| SAG | T1 | 3D TSE | 1 | 0 | no | 23 | AXIAL, COR | NO ANGLE. Cover ears and nose. Spacing and gap are variable. |
| IACs ONLY: | ||||||||
| AXIAL | T2 | 3D TSE | 0.5 | 0 | no | 17 | COR, SAG OBLIQ | Small FOV, F-H about 2.8 cm, centered on IACs. |
| optional AXIAL | DWI | 2D TSE or RESOLVE | 2 | 0.2 | YES | 17 | no | Only run if cholesteatoma. Small FOV, F-H about 5.2 cm, centered on IACs. Send only B1000 & ADC. TSE or RESOLVE (not EPI). |
| HAND INJECT CONTRAST. | ||||||||
| SAG-brain | T2 FLAIR | 3D IR-TSE | 1 | 0 | YES | 23 | AXIAL, COR | Whole brain coverage. Angle to interhemispheric fissure. Cover ears and nose. Spacing and gap are variable. |
| AXIAL-brain | T1 | 3D TFE | 1 | 0 | no | 23 | no | Whole brain coverage. Angle to corpus. Cover at least 1cm above vertex through skull base. Cover entire nose. |
| AXIAL-IACs | T1 | 3D TSE | 0.5 | 0 | YES | 17 | COR, SAG | Small FOV, F-H about 5.2 cm, centered on IACs. |