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

radiology.wisc.edu
from radiology.wisc.edu More from this publisher
06.06.2014 Views

26 Revised 7/22/09 (Gentry/Ranallo) Head Trauma: Helical Pediatric Infant (0 – 3 yr) 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) 0.5 0.7 0.4 0.4 0.8 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) 2.5 2.5 2.5 2.5 2.5 Interval (mm) 1.5 1.5 1.5 1.5 1.5 Scan FOV Head Head Head Small Head Head kV 80 80 80 80 80 Smart mA/ Auto mA Range 140-680 80-390 140-680 130-640 80-390 Noise Index 3.3 3.3 3.3 3.3 3.3 (Manual mA) 460 260 460 430 260 Recon 1: DFOV 20 20 20 20 20 Recon Type Standard Standard Standard Standard Standard WW/ WL 80/25 80/25 80/25 80/25 80/25 Recon Option Plus Plus Plus Plus Plus Recon 2: DFOV 20 20 20 20 20 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 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

27 Revised 7/22/09 (Gentry/Ranallo) Orbit: (Routine) (Protocol – Adult: # 2.1 – Pediatric: # 12.1 & 12.2) Billing: Setup: DFOV: Contrast: Patient Age: 1. CT Orbit without, or with, or with and without 2. Contrast if used 1. Patient Supine, AP and lateral scouts, no gantry angle. 2. Extend the scouts to include aortic arch for smart prep. 3. Patient Positioning: Tilt the patients 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). You may need to put a foam pad under the occiput to get the head in this position. 4. Ask the patient to look straight ahead and hold their eyes in a very still position. 5. Start the scans at the infraorbital rim and scan through the top of the orbit Preferred 14 cm (Range 14-16 cm) 1. Adults: 75 ml of 240 mg/ml nonionic contrast media (use 150ml of 240mg/ml if a CT of the head will also be obtained) 2. Pediatrics: 1 ml / pound (2 ml/kg) of 240 non-ionic contrast media 3. Injection Rate: Adults: 3 ml/sec; Pediatric: 2 ml/sec 4. Smart prep over the cavernous sinus (adults) or aortic arch (peds). Begin scanning 10 seconds (adults) or 6 seconds (pediatric) after arrival of contrast. 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. All 2-D reformats described below are to be done as 2 mm x 2 mm reformats. Do them in the coronal and bilateral oblique sagittal planes as shown in the image below. 2. 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 3) 3. If this is a “with & without” contrast study: Do not do Recons 2 and 3 on the contrast scan. Do 2D-reformats using the 1.25 mm standard algorithm images (Recon 1) only from the contrast series AND also do 2 mm x 2 mm reformats using the bone 0.625 mm images from the non-contrast series (Recon 3). 4. Do not send the 0.625 mm (Recon 3) bone images to PACS.

26 Revised 7/22/09 (Gentry/Ranallo)<br />

Head Trauma: Helical<br />

Pediatric Infant (0 – 3 yr)<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) 0.5 0.7 0.4 0.4 0.8<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) 2.5 2.5 2.5 2.5 2.5<br />

Interval (mm) 1.5 1.5 1.5 1.5 1.5<br />

Scan FOV Head Head Head Small Head Head<br />

kV 80 80 80 80 80<br />

Smart mA/ Auto mA Range 140-680 80-390 140-680 130-640 80-390<br />

Noise Index 3.3 3.3 3.3 3.3 3.3<br />

(Manual mA) 460 260 460 430 260<br />

Recon 1:<br />

DFOV 20 20 20 20 20<br />

Recon Type Standard Standard Standard Standard Standard<br />

WW/ WL 80/25 80/25 80/25 80/25 80/25<br />

Recon Option Plus Plus Plus Plus Plus<br />

Recon 2:<br />

DFOV 20 20 20 20 20<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<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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