Ct Extremity - Lower
CT EXTREMITY - LOWER
INDICATIONS: Trauma, fracture, dislocation, pain
PATIENT PREP: None
IV CONTRAST: Perform as directed by the supervising radiologist.
With:100 mL Isovue 370 @ 2.0 mL/second
WithOut:None
ORAL CONTRAST: None
POSITIONING: Feet First Supine (Adapt to Patient/Part)
TOPOGRAMS: AP. Range: Through region of interest. 25 mA, 110 kV.
Lateral. Range: Through region of interest. 25 mA, 110 kV
SCAN TYPE: Spiral/Helical
NOTES: Scan in as close to Axial Plane as possible. Then do 2mm Reconstructions in Axial/Coronal/Sagittal planes angled to body part in question.
On the Recon Card use 3D Axial/Coronal/Sagittal to do this.
Send Thin Slice Volume Source Images: Recon #1 (0.75 x 0.7mm) to PACS.
Check if referring physician has specific orders.
ALARA – Keep radiation dose As Low As Reasonably Achievable.
*3D Only if Ordered by Referring Physician or requested by Radiologist. Obtain order for 3D from referring physician.
For 3D Only: Send Recon 3D0.75 x 0.4mm to Vital Workstation for 3D and call Spokane.
EXTREMITY - LOWER
ScanRange / ScanDirection
Scan Type / Respiration / Scan
Delay
(Seconds) / CARE
DOSE
4D / Quality
Reference
mAs / kV / Detector Configuration
Slices Per Tube Rotation / Pitch
Table Increment/Speed: (mm/rotation) / Rotation
Time
(Seconds) / SFOV
(cm)
Through Region
of Interest
Or Specified by
Referring Physician / Craniocaudal
Spiral/Helical / Quiet
Respiration / WithOut: 3 Sec
With: 90 Sec / ON / 60 / 110 / Detectors: 16 x 0.6 mm
Slices Per Tube Rotation: 16 / Pitch 0.8
Table Increment/Speed: 7.68 mm/rotation / 1.0
Seconds / 50
cm
Plane / Slice
Thickness / Interval / Kernal / Window
Width/Level / DFOV
(cm)
RECON =- AXIAL BONE
Send To PACS / Original Scan
Thin Slice Volume Source Images / 0.75 mm / 0.7 mm / B70s
Sharp / Osteo
1500/450 / FOVSmall
To Fit Anatomy
RECON – AXIAL BONE MPR
Axials Angled in Plane to Body Part / Axials Angled in Plane to Body Part
Recon Card 3D Axial MPR / 2.0 mm / 2.0 mm / B70s
Sharp / Osteo
1500/450 / FOV Small
To Fit Anatomy
RECON – AXIAL SOFT TISSUE MPR
Axials Angled in Plane to Body Part / Axials Angled in Plane to Body Part
Recon Card 3D Axial MPR / 2.0 mm / 2.0 mm / B30s
Medium Smooth / Mediastinum
400/40 / FOV Small
To Fit Anatomy
RECON – CORONAL BONE MPR
Coronals Angled In Plane to Body Part / Coronals Angled in Plane to Body Part
Recon Card 3D Coronal MPR / 2.0 mm / 2.0 mm / B70s
Sharp / Osteo
1500/450 / FOV Small
To Fit Anatomy
RECON – SAGITTAL BONE MPR
Sagittals Angled in Plane to Body Part / Sagittals Angled in Plane to Body Part
Recon Card 3D Sagittal MPR / 2.0 mm / 2.0 mm / B70s
Sharp / Osteo
1500/450 / FOV Small
To Fit Anatomy
RECON – 3D ONLY – AXIAL SOFT TISSUE
Send To Vital WorkStation for 3D / Original Scan For 3D Only
Thin Slice Volume Source Images With Overlap / 0.75 mm / 0.4 mm / B30s
Medium Smooth / Mediastinum
400/40 / FOV Small
To Fit Anatomy
*The operator must check the CTDIvol before and after the scan to ensure it is within the allowed dose range. Scans performed outside of the allowed range must be
documented and reviewed by the designated radiologist and/or physicist.
Allowed CTDIvol Dose Ranges:1 mGy – 20 mGy for 32 cm CTDI phantom.2 mGy – 40 mGy for 16 cm CTDI phantom.
XR29 Dose Notification Value (CTDIvol):20 mGy for 32 cm CTDI phantom.40 mGy for 16 cm CTDI phantom.
CHARGES:Bill for 3D in Charges section when ending exam: “3D POST PROCESSING CT”. (Obtain Order for 3D)
NETWORK:Exam to PACS. For 3D Only: Send Recon 3D0.75 x 0.4mm to Vital Workstation for 3D and call Spokane
12/2017