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

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74 Revised 7/22/09 (Gentry/Ranallo) Scan Factors for Part 3 only: Temporal Bone: (Vascular Mass) Pediatric Child (0 – 3yr) 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 0.7 0.5 0.5 Detector Coverage (mm) Beam Collimation (mm) 10 10 10 20 Detector Rows 16 16 16 16 Pitch 0.562 0.562 0.562 0.531 Speed (mm/rot) 5.625 5.625 5.625 10.62 Detector Configuration 16 x 0.625 16 x 0.625 16 x 0.625 64 x 0.625 Slice Thickness (mm) 1.25 1.25 1.25 1.25 Interval (mm) 0.75 0.75 0.75 0.625 Scan FOV Head Head Head Small Head kV 80 80 80 80 Smart mA/ Auto mA Range 130-630 90-400 120-610 120-580 Noise Index 6.8 6.8 6.8 6.8 (Manual mA) 430 290 410 380 Recon 1: DFOV 20 20 20 20 Recon Type Standard Standard Standard Standard WW/ WL 400/40 400/40 400/40 400/40 Recon Option Plus Plus Plus Full Recon Option Contrast (Part 3 Only) CT 1 CT 2 CT 3 CT 4 & ER CT East & RP CT IQ Enhance
75 Revised 7/22/09 (Gentry/Ranallo) Neck: (Routine) (Protocol – Adult: # 3.1 – Pediatric: # 13.1) Billing: Setup: DFOV: Contrast: (Feet First) (Protocol – Adult: # 3.2 – Pediatric: # 13.2) 1. CT Neck without, or with, or without and with 2. Contrast if used 1. Patient supine, AP and lateral scouts from sella to mid chest, no gantry angle 2. Extend the scouts to include aortic arch for smart prep. 3. Have the patient remove any dentures or removable teeth, please place the shoulders as low possible 4. Start the scan at the carina and scan to the top of the orbit 5. 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). 6. Do angled views at 2.5 mm 4i for 8 slices at 2 different angles if there is lots of artifact from dental fillings or metal hardware (see below) 7. Note: see page 138 for protocol modifications if done as combined study with body/chest/abdomen/pelvis CT) Preferred 30 cm (Range 26-30 cm) 1. Adults: 100 ml of 300 mg/ml nonionic contrast media, Pediatrics: 1 ml/lb (2 ml/kg) of 300 non-ionic contrast media. 2. Use a 50 ml saline chaser in adults and a 10-25 ml saline chaser in pediatrics. 3. Injection Rate: Adults: 3.0 ml/sec; Pediatric: 2.0-2.5 ml/sec 4. Smart prep over the aortic arch. 5. CT scan delay after arrival of contrast in aortic arch: Adult: 10 sec (4-8 slice scanner), 15 sec (16 slice scanner), 20 sec (64 slice scanner) Peds: 5 sec (4-8 slice scanner), 8 sec (16 slice scanner), and 10 sec (64 slice scanner) Reformats and Recons: 1. For Adult scans: There is a soft tissue 2.5 mm slice thickness for Recon 1, a bone plus 1.25 mm slice thickness for Recon 2, and a soft tissue 1.25 mm slice thickness for Recon 3. Only send Recon 1 and 2 to PACS. Do not send Recon 3 to PACS. Use the 1.25 mm slices in Recon 3 for the soft tissue reformats. Use the 1.25 mm slices in Recon 2 for the bone reformats. 2. For Pediatric scans: There is a soft tissue 1.25 mm slice thickness for Recon 1, a bone plus 1.25 mm slice thickness for Recon 2, and a bone plus 0.625 mm slice thickness for Recon 3. Only send Recon 1 and 2 to PACS. Do not send Recon 3 to PACS. Use the 1.25 mm slices in Recon 1 for the soft tissue reformats. Use the 0.625 mm slices in Recon 3 for the bone reformats. 3. Do 2 mm by 2 mm 2D-Reformations in the coronal and sagittal planes
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Adult Head: (Axial Mode) (Protocol
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Appendix # 2 129 Revised 7/22/09 (G
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Suggestions for ROI Placement 133 R
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1. CTA (High-res COW) 2. CTA (Strok
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CT Protocols: (Brain, ENT, Spine, Vascular) - Department of Radiology

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