Closed Mouth and Open Mouth

CT TMJ

CLOSED MOUTH AND OPEN MOUTH

INDICATIONS: TMJ pain, popping, locking, dysfunction

PATIENT PREP: No Prep

IV CONTRAST: None

ORAL CONTRAST: None

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

TOPOGRAMS: AP. Range: Above TMJ through mandibular notch/superior ramus. 35 mA, 120 kV.

Lateral. Range: Above TMJ through mandibular notch/superior ramus. 35 mA, 120 kV.

SCAN TYPE: Spiral/Helical

NOTES: Scan Bilateral TMJs.

Perform Closed Mouth scan And Then Perform Open Mouth scan.

ALARA – Keep radiation dose As Low As Reasonably Achievable.

TMJ

CLOSED MOUTH AND OPEN MOUTH

Scan
Range / Scan Direction
Scan Type / Respiration / Scan
Delay
(Seconds) / CARE
DOSE
4D / Quality
Reference
mAs / CARE
kV / Quality
Reference
kV / Detector Configuration
Slices Per Tube Rotation / Pitch
Table Increment/Speed
(mm/rotation) / Rotation
Time
(Seconds) / SFOV
(cm)
Above TMJ Through
Mandibular Notch/
Superior Ramus / Craniocaudal
Spiral/Helical / Quiet
Respiration / 2
Seconds / ON / 125 / Semi / 120 / Detectors: 64 x 0.6 mm
Slices Per Tube Rotation: 32 / Pitch: 0.8
Table Increment/Speed:
15.36 mm/rotation / 1.0
Seconds / 30
cm
Plane / SAFIRE
Strength / Slice
Thickness / Interval / Kernal / Window
Width/Level / DFOV
(cm)
RECON – AXIAL BONE
Axial Bilateral TMJs / Axial Bilateral TMJs
Bone / OFF / 0.6 mm / 0.6 mm / H60s
Sharp FR / Osteo
1500/450 / FOV just beyond
Patient’s face
RECON – AXIAL SOFT TISSUE
Axial Bilateral TMJs / Axial Bilateral TMJs
Soft Tissue / OFF / 0.6 mm / 0.6 mm / H40s
Medium / Mediastinum
350/50 / FOV just beyond
Patient’s face
RECON – CORONAL BONE MPR
Bilateral Coronals – Straight
Straight – Not Oblique / Bilateral Straight Coronals
Straight – Not Oblique
Recon Card 3D Coronal MPR / OFF / 0.6 mm / 0.6 mm / H60s
Sharp FR / Osteo
1500/450 / FOV just beyond
Patient’s face
RECON – SAGITTAL BONE MPR
Bilateral Sagittals – Straight
Straight – Not Oblique / Bilateral Straight Sagittals
Straight - Not Oblique
Recon Card 3D Sagittal MPR / OFF / 0.6 mm / 0.6 mm / H60s
Sharp FR / Osteo
1500/450 / 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: 2 mGy – 60 mGy

XR29 Dose Notification Value (CTDIvol): 60 mGy

NETWORK: Exam to PACS

12/2017