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

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62 Revised 7/22/09 (Gentry/Ranallo) Temporal Bone: (W/O Contrast) (Protocol – Adult: # 2.10 – Pediatric: # 12.18 & 12.19) Billing: Setup: 1. Temporal Bone without 1. Patient Supine, AP and lateral scouts, no gantry angle 2. Only use 16 and 64 slice scanners 3. 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 below). 4. Start scans at the mastoid tip and finish at the top of the petrous bone (see below) DFOV: Patient Age: 1. Recon 1 and Retro Recons: Preferred 20 cm (Range 18-22 cm) 2. Recon 2 and 3 of TB: 9.6 cm Choose the CT scan factors on the scanner for the proper age range of the patient 1. Child: (3 – 6 years) 2. Infant: (0 – 3 years) Recons & Reformats: 1. Recon 1: 2.5 mm axial images using a bone algorithm. 2. Recon 2 & 3: Obtain left and right 0.625 mm temporal bone axial images with a DFOV of 9.6 cm. 3. Perform 1 additional Retro Recons to get the following axial images of the entire scan range: At 20 cm DFOV, standard algorithm, 2.5 mm slice thickness, 1.25 mm increment, (WW/WL: 400/30) 4. Do 1 mm by 1 mm 2D-reformats in the coronal, Stenver’s, and Pöschl planes of each temporal bone using Recon 2 & 3 as source images (below)
63 Revised 7/22/09 (Gentry/Ranallo) Temporal Bone 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 0.7 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) 2.5 2.5 2.5 2.5 Interval (mm) 1.25 1.25 1.25 1.25 Scan FOV Head Head Head Head kV 120 120 120 120 Smart mA/ Auto mA Range 190-610 130-420 180-590 170-560 Noise Index 3.7 3.7 3.7 3.7 (Manual mA) 490 340 470 450 Recon 1: DFOV 20 20 20 20 Recon Type Bone Plus Bone Plus Bone Plus Bone Plus WW/ WL 3000/300 3000/300 3000/300 3000/300 Recon Option Full Full Full Full Recon 2: DFOV 9.6 9.6 9.6 9.6 Recon Type Bone Plus Bone Plus Bone Plus Bone Plus WW/ WL 3000/300 3000/300 3000/300 3000/300 Recon Option Plus Plus Plus Full Recon Option IQ Enhance Slice Thickness (mm) 0.625 0.625 0.625 0.625 Interval (mm) 0.375 0.375 0.375 0.312 Recon 3: DFOV 9.6 9.6 9.6 9.6 Recon Type Bone Plus Bone Plus Bone Plus Bone Plus WW/ WL 3000/300 3000/300 3000/300 3000/300 Recon Option Plus Plus Plus Full Recon Option Non-Contrast CT 1 CT 2 CT 3 CT 4 & ER CT East & RP CT IQ Enhance Slice Thickness (mm) 0.625 0.625 0.625 0.625 Interval (mm) 0.375 0.375 0.375 0.312
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5 Revised 7/22/09 (Gentry/Ranallo)
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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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