| 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.
|
