Specific anatomic region Carotid CTA
Application Carotid stenosis
Author Elliot K Fishman, MD
Reference Source JHU Protocol
Scanner Used Siemens Sensation 64
KV/Effective mAs/ Rotation time (sec) 120/ 200 / .33
Detector Collimation (mm) .6
Slice thickness (mm) .75
Pitch .9
Kernel B20
Reconstruction interval .5
Image order (acquisition) Cr-ca
Oral contrast N/A
IV contrast volume and type 100 cc of Omnipaque 350 or Visipaque 320
Injection rate 4cc/sec
Scan delay (sec) 15 sec empirical delay / bolus tracking
3D technique used VRT/MIP
  • Bolus tracking - ROI placed at aortic arch, threshold set at 70 HU.
  • 3D mapping using both VRT and MIP are part of the standard carotid artery protocol to define the presence, location, and extent of stenosis.
  • We do not routinely do a non-contrast study.