CT - PTBs (petrous temporal bones)
Date last published:
These protocols are based on the Force CT used at Starship Radiology. Contrast volumes in these guidelines are a guide only as they are scanner dependent and work is currently underway to reduce volumes
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Radiology
| Indications | - loss of hearing - otitis media - chronic ear infection - mastoiditis - osteochondroma - evaluate EAM - congenital anomaly - trauma |
| Patient preparation | Remove hearing aids |
| Patient position | Head first Supine OM line perpendicular to table |
| Oral contrast (if required) | |
| Patient instruction | |
| Scan range/phase | From the base of the skull to the top of the mastoid air cells. |
| IV Contrast | If required by radiologist 1 mL/kg 300 concentration max dose 50 mLs |
| Scan Delay | If contrast 2 - 3 minutes |
| Recons/Reformats | Slice thickness/increment | Kernel | Window | SAFIRE/ADMIRE | |
|---|---|---|---|---|---|
| Bone | Thins | 0.4 x 0.2 mm | Ur 69 | Inner ear | 1 |
| Rt and Lt inner ear | 0.6 x 0.4 mm | ||||
| Auto Recons Rt and Lt PTB Bone | Axial | 0.6 x 0.4mm | Ur 69 | Inner ear | 1 |
| Coronal | 1 x 0.5 mm | ||||
| Sagittal | 1 x 0.5 mm | ||||
| Soft tissue | Axial | 4 x 4 mm | Ub 44 | Cerebrum | 2 |
| Scanner Parameters | FORCE |
|---|---|
| CARE KV Semi CAREDOSE 4D on | 120 |
| Quality Reference mAs | 450 |
| Rotation time | 1.0 s |
| Detector Collimation | 0.6 |