Specific Anatomic RegionExtremities
ApplicationCTA of lower extremity
AuthorElliot K. Fishman, MD
Reference SourceJHU protocol
Scanner UsedSiemens Somatom Sensation 16
KV / Effective mAs / Rotation time (sec) 120 / 150 / 0.5
Detector Collimation (mm) 1.5 or .75
Slice Thickness (mm) 2 or 1
Feed / Rotation (mm) 24.0 or 12
Kernel B30s
Increment (mm)6.0 and .5 or 1
Image Ordercr-ca
Oral ContrastNone
IV Contrast Volume and Type150 cc of Omnipaque 350 plus saline chaser
Injection Rate3 cc/sec
Scan Delay (sec)Use either timing bolus or care bolus
3D Technique UsedVRT supplemented by MIP
Comment: 1. -The CTA of the lower extremities requires careful editing of bone. for MIP. With VRT using new Inspace presets we can do quality imaging without editing in many cases.
2. We now routinely use a 30-50 cc saline chaser in all run-off studies. This is critical.
3. Reconstruction for best detail is 0.75 mm collimation, 0.75 mm slice thickness at .5 mm intervals.