Specific Anatomic Region | Colon | ||
Application | Virtual colonoscopy | ||
Author | Elliot K. Fishman, MD | ||
Reference Source | JHU protocol | ||
Scanner Used | Siemens Somatom Sensation 16 | ||
KV / Effective mAs / Rotation time (sec) | SUPINE 120 / 200 / 0.5 | PRONE 120 / 200 / 0.5 | |
Detector Collimation (mm) | 0.75 - 1.5 | 0.75 - 1.5 | |
Slice Thickness (mm) | 1.0 - 2.0 | 1.0 - 2.0 | |
Feed / Rotation (mm) | 12.0 | 12.0 | |
Kernel | B30 | B30 | |
Increment (mm) | 1.0 | 1.0 | |
Image Order | cr-ca | ||
Oral Contrast | None | ||
IV Contrast Volume and Type | Not needed but can be helpful | ||
Injection Rate | N/A | ||
Scan Delay (sec) | N/A | ||
3D Technique Used | 1. Use MPR to look at axial images and coronal/sagittal images and their "colonoscopy program" for the fly through. 2. The key is patient prep and we use the fleet 1 (one) prep kit. 3. Colonic distension is critical and we put around 2000 cc of air into the colon (or more as needed). | ||
Comment: - Some people might consider this excessive and do 3mm thick sections but we prefer 1mm. The mAs can be dropped to 100-120 for a low dose study. Recon- Sup/ prone 5x5 for filming Recon Lung/ liver 5x5 for filming |