CT NECKSOFT TISSUE - PARATHYROID

INDICATIONS: Parathyroid pathology

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

IV CONTRAST: With:80mL Isovue 370 @ 3.0 mL/second

WithOut:None

ORAL CONTRAST: None

POSITIONING: Head First Supine, Arms by sides

TOPOGRAMS: AP. Angle of mandible to carina. 25 mA, 110 kV.

Lateral. Angle of mandible to carina. 25 mA, 110 kV

SCAN TYPE: Spiral/Helical. If necessary: Sequential Axials angled behind dental work.

NOTES: Adjust delay on Venous scan to be performed at 70 seconds.

ALARA – Keep radiation dose As Low As Reasonably Achievable.

NONCONTRAST

Scan
Range / 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)
Angle of Mandible
To Carina. / Craniocaudal
Spiral/Helical / Don’t
Swallow / 3
Seconds / ON / 130 / 110 / Detectors: 16 x 1.2 mm
Slices Per Tube Rotation: 16 / Pitch: 0.8
Table Increment/Speed: 15.36mm/rotation / 0.6
Seconds / 50
cm
Plane / Slice
Thickness / Interval / Kernal / Window
Width/Level / DFOV
(cm)
RECON – AXIAL SOFT TISSUE / Axial / 2.0 mm / 2.0 mm / B40s
Medium / Mediastinum
400/40 / FOV just beyond
patient’s neck
RECON – CORONAL SOFT TISSUE 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 / B40s
Medium / Mediastinum
400/40 / FOV just beyond
patient’s neck
RECON – SAGITTAL SOFT TISSUE 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 / B40s
Medium / Mediastinum
400/40 / FOV just beyond
patient’s neck

ARTERIAL

Scan
Range / Scan Direction
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)
Angle of Mandible
To Carina. / Craniocaudal
Spiral/Helical / Don’t
Swallow / 25
Seconds / ON / 130 / 110 / Detectors: 16 x 1.2 mm
Slices Per Tube Rotation: 16 / Pitch: 0.8
Table Increment/Speed: 15.36mm/rotation / 0.6
Seconds / 50
cm
Plane / Slice
Thickness / Interval / Kernal / Window
Width/Level / DFOV
(cm)
RECON – AXIAL SOFT TISSUE / Axial / 2.0 mm / 2.0 mm / B40s
Medium / Mediastinum
400/40 / FOV just beyond
patient’s neck
RECON – CORONAL SOFT TISSUE 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 / B40s
Medium / Mediastinum
400/40 / FOV just beyond
patient’s neck
RECON – SAGITTAL SOFT TISSUE 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 / B40s
Medium / Mediastinum
400/40 / FOV just beyond
patient’s neck

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VENOUS

Scan
Range / Scan Direction
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)
Angle of Mandible
To Carina. / Craniocaudal
Spiral/Helical / Don’t Swallow / Adjust delay to scan at
70 seconds / ON / 130 / 110 / Detectors: 16 x 1.2 mm
Slices Per Tube Rotation: 16 / Pitch: 0.8
Table Increment/Speed: 15.36mm/rotation / 0.6
Seconds / 50
cm
Plane / Slice
Thickness / Interval / Kernal / Window
Width/Level / DFOV
(cm)
RECON – AXIAL SOFT TISSUE / Axial / 2.0 mm / 2.0 mm / B40s
Medium / Mediastinum
400/40 / FOV just beyond
patient’s neck
RECON – CORONAL SOFT TISSUE 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 / B40s
Medium / Mediastinum
400/40 / FOV just beyond
patient’s neck
RECON – SAGITTAL SOFT TISSUE 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 / B40s
Medium / Mediastinum
400/40 / FOV just beyond
patient’s neck

SEQUENTIAL AXIALS ANGLED FOR DENTAL WORK

Scan
Range / Scan Direction
Scan Type / Respiration / Scan
Delay
(Seconds) / CARE
DOSE
4D / Effective
mAs / kV / Detector Configuration
Slices Per Acquisition / Table Feed
(mm) / Scan
Time
(Seconds) / Cycle
Time
(Seconds) / SFOV
(cm)
Top slice in Amalgam with
3 slices Caudally, Angled
Cephalic behind dental work. / Craniocaudal
Sequential / Quiet
Respiration / 30 Seconds
To allow
Gantry Tilt / OFF / 150 / 110 / Detectors: 16 x 1.2 mm
Slices Per Acquisition: 16 / 20.5 mm / Full
1.5
Seconds / 3.75
Seconds / 50
cm
Plane/
Gantry Tilt / Slice
Thickness / Interval / Kernal / Window
Width/Level / DFOV
(cm)
RECON / Axials Angled Cephalic
behind dental work / 2.4 mm / 2.4 mm / B40s
Medium / Mediastinum
450/50 / FOV just beyond
patient’s neck

*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,32 cm CTDI Phantom

XR29 Dose Notification Value (CTDIvol):60 mGy

NETWORK:Exam to PACS

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