Specific Anatomic Region | Colon |
Application | Virtual colonoscopy |
Author | Fishman EK |
Reference Source | Personal Communication |
Scanner Used | Siemens Plus4 Volume Zoom |
KV / mAs / Time per Rotation (sec) | 120/165/.5 |
Detector Collimation (mm) | 1 or 2.5 |
Slice Thickness (mm) | 1.25 or 3 |
Data Reconstruction Interval (mm) | 1 or 3 |
Table Speed (mm per rotation) / Pitch | 6 /6 or 15 / 6 |
Oral Contrast | N/A (rectal air only) |
IV Contrast Volume and Type | N/A or IV contrast |
Injection Rate | N/A or 2-3 cc/sec |
Scan Delay (sec) | N/A or 30 sec |
3D Technique Used | MPR and Volume rendering |
Comments: - The optimal protocols have not yet been defined. A lower dose study can be done using 120 / 110 / .5 with a pitch of 6 (12 mm / sec travel). Low dose will be important if virtual colonoscopy becomes a screening tool.
- We like to use IV contrast as it makes it easier to detect the presence of polyps.
- Prone and supine images are needed in all cases.
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