CT SINUS ROUTINE

INDICATIONS:WithOut:Sinusitis

With:Tumor

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 Glabelloalveolar Line horizontal/parallel to z-axis. No tilt or rotation.

TOPOGRAMS:Lateral. Range: Below maxillary sinuses through frontal sinuses. 35 mA, 120 kV.

SCAN TYPE:Spiral/Helical

NOTES:ALARA – Keep radiation dose As Low As Reasonably Achievable.

SINUS ROUTINE

Scan
Range / ScanDirection
Scan Type / Respiration / Scan
Delay
(Seconds) / CARE
DOSE
4D / Quality
Reference
mAs / CARE
kV / Quality
Reference
mAs / Detector Configuration
Slices Per Tube Rotation / Pitch
Table Increment/Speed: (mm/rotation) / Rotation
Time
(Seconds) / SFOV
(cm)
Below Maxillary Sinuses Through
Frontal Sinuses / Caudocranial
Spiral/Helical / Quiet
Respiration / WithOut: 4 seconds
With: 60 seconds / ON / 50 / ON / 120 / Detectors: 64 x 0.6 mm
Slices Per Tube Rotation: 32 / Pitch: 0.8 mm
Table Increment/Speed:
15.36 mm/rotation / 1.0
Seconds / 30
cm
Plane
Positioning and Reformat Angles / SAFIRE
Strength / Slice
Thickness / Interval / Kernal / Window
Width/Level / DFOV
(cm)
RECON – AXIAL BONE / Axial: Position Glabelloalveolar Line
horizontal/parallel to z-axis / OFF / 3.0 mm / 3.0 mm / H60s
Sharp FR / Sinuses
2000/400 / FOV to include all sinuses
Include tip of nose
RECON – CORONAL BONE MPR
Coronals Perpendicular to hard palette / Coronals Perpendicular to hard palette
Frontal Sinus Through Sphenoid Sinus
Recon Card 3D Coronal MPR / OFF / 1.0 mm / 1.0 mm / H60s
Sharp FR / Sinuses
2000/400 / FOV to include all sinuses
Include tip of nose
RECON – SAGITTAL BONE MPR
Sagittals Parallel to Mid-Sagittal Plane / Sagittals Parallel to Mid-Sagittal Plane
Through All Sinuses
Recon Card 3D Sagittal MPR / OFF / 1.0 mm / 1.0 mm / H60s
Sharp FR / Sinuses
2000/400 / FOV to include all sinuses
Include tip of nose

*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