CT Protocols: (Brain, ENT, Spine, Vascular) - Department of Radiology

Appendix # 1
128 Revised 7/22/09 (Gentry/Ranallo)
CTA Head: 2D Thin and Thick Slab Reformations
A. Do Thin 2D-Reformations through the vertebral and carotid arteries
1. 1 mm X 1 mm right oblique sagittal (see example below) (FOV = 12)
2. 1 mm X 1 mm left oblique sagittal (mirror image of example below) (FOV = 12)
a. Make sure the reference line is parallel to the carotid canal (see image below)
b. Use a window with and level of 800/200
c. Axial images to use for obtaining the oblique sagittal 2-D Reformations
- CTA Head Protocol: Images from C2 to the top of the lateral ventricles
- CTA Head and Neck: Images from C2 to the top of the lateral ventricles
d. Send to ALI Store
B. 2D Thick-Slab MIP Reformats of Head:
1. Choose the 1.25 mm slices
2. Select Ref. Detail.
3. Use a window width 600 and window level 200
4. Choose batch. (You don’t need to change slice thickness & rendering mode on image 1st)
5. Do axial, sagittal, and coronal thick-slab MIPs through the entire head. (See examples below)
6. Change the slice thickness to 10 mm with an interval of 2.5 mm and change the rendering mode from
Average to MIP.
7. Send to ALI Store.
8. Put the CT Angio request in the box on the wall in the E3/3 control room for the 3D to be done.
9. All patients should have a duplicate request made, write duplicate on it, put the duplicate request in the 3D
box, all remaining requests go to the neuro reading room.