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

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120 Revised 7/22/09 (Gentry/Ranallo) Vascular Imaging: CTA Neck Only: (Cerebrovascular Disease) (Protocol – Adult: # 3.8 – Pediatric: # 11.22 & 11.23) Billing: Setup: 1. CTA Neck/Arch (with contrast) 2. Contrast 1. Patient Supine, AP and lateral scouts, no gantry tilt 2. Extend the scouts to include the aortic arch for smart prep. 3. 16 or 64 slice scanners 4. Patient Positioning: Tilt the patient’s head so that a line connecting the lateral canthus of the eye and the EAC is perpendicular to the CT tabletop (see head CT protocol). Examination: CTA Neck and Arch 1. Scan Area Start scans at the carina and scan to the EAC (see below) 2. Scan direction Scan from bottom to top Networking: Processing: 3. Contrast Adult: On LS VCT 64 and LS 16 Pro: 80 ml of Iohexol 300 (24 g Iodine) with a 50 ml saline chase Adult: On LS 16, LS 8 and LS 4: 120 ml of Iohexol 300 (24 g Iodine) with a 50 ml saline chase Peds: 1 ml/lb (2 ml/kg) of Iohexol 300 with a 10-25 ml saline chase 4. Injection Rate Adult: 4 ml per sec Peds: 2.0-2.5 ml/sec 5. Smart Prep Over aortic arch (initiate the scan at the entry of contrast in the aortic arch) 1. ALI store, CTAW2 and CTAW3 1. Thick Slab Reformat Instructions (See Appendix 1) 2. Perfusion Analysis (3D Lab) (See Appendices 3 and 4) 3. 3D Intravascular Image Analysis on ADW workstation (Do on Stent Cases)
121 Revised 7/22/09 (Gentry/Ranallo) Smart Prep Prep Over mA Monitoring Delay (sec) Monitoring ISD (sec) Enhancement Threshold Diagnostic Delay (sec) Aortic Arch 80 10.0 3 50 3.0 CTA: Neck Only Adult Scanner GE LS Xtra GE LS 16 GE LS 16 Pro GE LS VCT 64 GE LS 8 Scan Type Helical Helical Helical Helical Helical Rotation Time (sec) 0.6 0.8 0.5 0.5 0.8 Detector Coverage (mm) Beam Collimation (mm) 20 20 20 20 10 Detector Rows 16 16 16 16 8 Pitch 0.562 0.562 0.562 0.531 0.625 Speed (mm/rot) 11.25 11.25 11.25 10.62 6.25 Detector Configuration 16 x 1.25 16 x 1.25 16 x 1.25 64 x 0.625 8 x 1.25 Slice Thickness (mm) 1.25 1.25 1.25 1.25 1.25 Interval (mm) 0.75 0.75 0.75 0.625 0.75 Scan FOV Large Large Large Head Large kV 120 120 120 120 120 Smart mA/ Auto mA Range 200-800 120-440 190-800 180-800 130-440 Noise Index 11.1 11.1 11.1 11.1 11.1 (Manual mA) 530 320 510 480 360 Recon 1: DFOV 22 22 22 22 22 Recon Type Standard Standard Standard Standard Standard WW/ WL 400/40 400/40 400/40 400/40 400/40 Recon Option Plus Plus Plus Full Plus Recon Option Recon 2: IQ Enhance DFOV 22 22 22 22 22 Recon Type Bone Plus Bone Plus Bone Plus Bone Plus Bone Plus WW/ WL 3500/350 3500/350 3500/350 3500/350 3500/350 Recon Option Plus Plus Plus Full Plus Recon Option Contrast CT 1 CT 2 CT 3 CT 4 & ER CT East & RP CT IQ Enhance Slice Thickness (mm) 1.25 1.25 1.25 1.25 1.25 Interval (mm) 0.75 0.75 0.75 0.625 0.75
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Adult Head: (Axial Mode) (Protocol
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CT Protocols: (Brain, ENT, Spine, Vascular) - Department of Radiology

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