ORBITS

INDICATIONS: WithOut:Trauma, fracture

With:Mass, infection

PATIENT PREP: WithOut:No Prep

With:NPO for solid foods, water only, for 4 hours prior to scan

IV CONTRAST: Perform as directed by the supervising radiologist.

WithOut:None

With:80mL Isovue 370 @ 2.0 mL/second.

ORAL CONTRAST: None

POSITIONING: Head First Supine. Position head to superimpose the base of the skull and acanthion.

TOPOGRAMS: AP. Range: Below inferior orbital rim to above superior orbital rim. 25 mA, 110 kV.

Lateral. Range: Below inferior orbital rim to above superior orbital rim. 25 mA, 110 kV.

SCAN TYPE: Spiral/Helical

NOTES: Instruct patient to keep eyes closed and not roll them during scan.

ALARA – Keep radiation dose As Low As Reasonably Achievable.

ORBITS

Scan
Range / ScanDirection
Scan Type / Respiration / Scan
Delay
(Seconds) / CARE
DOSE
4D / Effective
mAs / kV / Detector Configuration
Slices Per Tube Rotation / Pitch
Table Increment/Speed: (mm/rotation) / Rotation
Time
(Seconds) / SFOV
(cm)
Below Inferior Orbital Rim ToAbove
Superior Orbital Rim / Caudocranial
Spiral/Helical / Quiet
Respiration / WithOut: 3 Seconds
With: 60 Seconds / OFF / 70 / 130 / Detectors: 16 x 0.6 mm
Slices Per Tube Rotation: 16 / Pitch: 0.8
Table Increment/Speed:7.6 mm/rotation / 1.0
Seconds / 30
cm
Plane / Slice
Thickness / Interval / Kernal / Window
Width/Level / DFOV
(cm)
RECON – AXIAL BONE / Axial / 1.0 mm / 1.0 mm / H70s
Sharp FR / Osteo
3000/300 / FOV just beyond
Patient’s face
RECON – AXIAL SOFT TISSUE / Axial / 1.0 mm / 1.0 mm / H40s
Medium / Mediastinum
450/50 / FOV just beyond
Patient’s face
RECON – CORONAL BONE MPR
Coronals Angled in Plane to Body Part / Bilateral Coronals Angled in Plane to Body Part
Recon Card 3D Coronal / 1.0 mm / 1.0 mm / H70s
Sharp FR / Osteo
3000/300 / FOV just beyond
Patient’s face
RECON – SAGITTAL BONE MPR
Sagittals Angled in Plane to Body Part / Bilateral Straight Sagittals
Angled in Plane to Body Part
Recon Card 3D Sagittal / 1.0 mm / 1.0 mm / H70s
Sharp FR / Osteo
3000/300 / FOV just beyond
Patient’s face
RECON – CORONAL SOFT TISSUE MPR
Coronals Angled in Plane to Body Part / Bilateral Coronals Angled in Plane to Body Part
Recon Card 3D Coronal / 1.0 mm / 1.0 mm / H40s
Medium / Mediastinum
450/50 / FOV just beyond
Patient’s face
RECON – SAGITTAL SOFT TISSUE MPR
Sagittals Angled in Plane to Body Part / Bilateral Straight Sagittals
Angled in Plane to Body Part
Recon Card 3D Sagittal / 1.0 mm / 1.0 mm / H40s
Medium / Mediastinum
450/50 / FOV just beyond
Patient’s face

*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:4 mGy – 60 mGy

XR29 Dose Notification Value (CTDIvol):60 mGy

NETWORK:Exam to PACS

12/2017