CT Protocols: (Brain, ENT, Spine, Vascular) - Department of Radiology
CT Protocols: (Brain, ENT, Spine, Vascular) - Department of Radiology CT Protocols: (Brain, ENT, Spine, Vascular) - Department of Radiology
96 Revised 7/22/09 (Gentry/Ranallo) Smart Prep Prep Over mA Monitoring Delay (sec) Monitoring ISD (sec) Enhancement Threshold Aortic Arch 80 10.0 3.0 50 Diagnostic Delay (sec) LS VCT64: 20.0 LS Xtra, LS 16 & 16 Pro: 15.0 LS 8: 10.0 Lumbar Spine: Routine 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 0.9 0.5 0.5 1.0 Detector Coverage (mm) Beam Collimation (mm) 10 10 10 20 10 Detector Rows 16 16 16 16 8 Pitch 0.562 0.562 0.562 0.531 0.625 Speed (mm/rot) 5.625 5.625 5.625 10.62 6.25 Detector Configuration 16 x 0.625 16 x 0.625 16 x 0.625 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 Large Body Large kV 120 120 120 120 120 Smart mA/ Auto mA Range 170-760 90-440 160-760 150-750 90-440 Noise Index 14.4 14.4 14.4 14.4 14.4 (Manual mA) 330 180 320 300 180 Recon 1: DFOV 18 18 18 18 18 Recon Type Standard Standard Standard Standard Standard WW/ WL 450/60 450/60 450/60 450/60 450/60 Recon Option Plus Plus Plus Full Plus Recon Option Recon 2: IQ Enhance DFOV 18 18 18 18 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 18 18 18 18 18 Recon Type Bone Plus Bone Plus Bone Plus Bone Plus Bone Plus WW/ WL 3000/300 3000/300 3000/300 3000/300 3000/300 Recon Option Plus Plus Plus Full Plus Recon Option Non-Contrast or 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
97 Revised 7/22/09 (Gentry/Ranallo) Cervical Spine: (Pediatric Routine) (Protocol: # 13.5) Billing: Setup: DFOV: 1. CT cervical spine without, or with, or without and with 2. Contrast if used 1. Patient Supine, AP and lateral scouts, no gantry angle 2. Extend the scouts to include the aortic arch for smart prep if IV contrast is to be used. 3. Patient Positioning: - Warning: Do not flex or extend the neck if there has been recent spine trauma or if the patient is in a c-spine trauma collar. - If no recent trauma, 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. - The shoulders should be pulled down as much as possible 4. Scan from the top of the sella to the bottom of T2 5. Post myelography patients: Please remember to roll the patient 360 degrees before scanning in order to distribute the contrast evenly in the spinal canal. Preferred 15 cm (Range 14-18 cm) Contrast: 1. Injection parameters: 2. Volume: 1 ml/lb (2 ml/kg) of 240 non-ionic contrast. 3. Injection Rate: 2 ml/sec 4. Smart prep over the aortic arch. 5. CT scan delay after arrival of contrast in the aortic arch: 5 sec (8 slice scanners), 8 sec (16 slice scanners), 10 sec (64 slice scanners) Recons & Reformats: 1. All 2-D reformats described below are to be done as 2 mm x 2 mm reformats. Do them in the coronal and sagittal planes. 2. You must include the entire larynx and hyoid bone on the sagittal 2D reformats (see below) 3. If this is an exam solely with contrast or solely without contrast: Do 2D-reformats using both the standard 1.25 mm images (Recon 1) AND the bone 0.625 mm images (Recon 2) 4. If this is a “with & without” contrast study: Do not do Recons 2 and 3 on the contrast scan. Do 2D-reformats using the standard 1.25 mm images (Recon 1) only from the contrast series AND also do 2 mm x 2 mm reformats using the bone 0.625 mm images (Recon 2) from the non-contrast series. 5. Do not send the 0.625 mm (Recon 2) bone images to PACS.
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96 Revised 7/22/09 (Gentry/Ranallo)<br />
Smart Prep<br />
Prep Over<br />
mA<br />
Monitoring Delay<br />
(sec)<br />
Monitoring<br />
ISD (sec)<br />
Enhancement<br />
Threshold<br />
Aortic Arch 80 10.0 3.0 50<br />
Diagnostic Delay (sec)<br />
LS V<strong>CT</strong>64: 20.0<br />
LS Xtra, LS 16 & 16 Pro: 15.0<br />
LS 8: 10.0<br />
Lumbar <strong>Spine</strong>: Routine<br />
Adult<br />
Scanner GE LS Xtra GE LS 16 GE LS 16 Pro GE LS V<strong>CT</strong> 64 GE LS 8<br />
Scan Type Helical Helical Helical Helical Helical<br />
Rotation Time (sec) 0.6 0.9 0.5 0.5 1.0<br />
Detector Coverage (mm)<br />
Beam Collimation (mm)<br />
10 10 10 20 10<br />
Detector Rows 16 16 16 16 8<br />
Pitch 0.562 0.562 0.562 0.531 0.625<br />
Speed (mm/rot) 5.625 5.625 5.625 10.62 6.25<br />
Detector Configuration 16 x 0.625 16 x 0.625 16 x 0.625 64 x 0.625 8 x 1.25<br />
Slice Thickness (mm) 1.25 1.25 1.25 1.25 1.25<br />
Interval (mm) 0.75 0.75 0.75 0.625 0.75<br />
Scan FOV Large Large Large Large Body Large<br />
kV 120 120 120 120 120<br />
Smart mA/ Auto mA Range 170-760 90-440 160-760 150-750 90-440<br />
Noise Index 14.4 14.4 14.4 14.4 14.4<br />
(Manual mA) 330 180 320 300 180<br />
Recon 1:<br />
DFOV 18 18 18 18 18<br />
Recon Type Standard Standard Standard Standard Standard<br />
WW/ WL 450/60 450/60 450/60 450/60 450/60<br />
Recon Option Plus Plus Plus Full Plus<br />
Recon Option<br />
Recon 2:<br />
IQ Enhance<br />
DFOV 18 18 18 18<br />
Recon Type Bone Plus Bone Plus Bone Plus Bone Plus<br />
WW/ WL 3000/300 3000/300 3000/300 3000/300<br />
Recon Option Plus Plus Plus Full<br />
Recon Option<br />
IQ Enhance<br />
Slice Thickness (mm) 0.625 0.625 0.625 0.625<br />
Interval (mm) 0.375 0.375 0.375 0.312<br />
Recon 3:<br />
DFOV 18 18 18 18 18<br />
Recon Type Bone Plus Bone Plus Bone Plus Bone Plus Bone Plus<br />
WW/ WL 3000/300 3000/300 3000/300 3000/300 3000/300<br />
Recon Option Plus Plus Plus Full Plus<br />
Recon Option<br />
Non-Contrast or Contrast<br />
<strong>CT</strong> 1 <strong>CT</strong> 2 <strong>CT</strong> 3 <strong>CT</strong> 4 & ER <strong>CT</strong> East & RP <strong>CT</strong><br />
IQ Enhance<br />
Slice Thickness (mm) 1.25 1.25 1.25 1.25 1.25<br />
Interval (mm) 0.75 0.75 0.75 0.625 0.75
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