X-RAY OF MASTOID

X-RAY OF MASTOID

X-ray Temporal Bone Stenvers View

Picture: Temporal Bone

Temporal Bone Axiolateral (Stenvers)

Region: petrous ridge, temporal bone, internal acoustic meatus, mastoid air cell

Pathology: inflammation of petrous ridge and mastoid air cell, tumor and foreign body of internal acoustic meatus

SID: 100 cm (40 inches)

Central Ray: beam directed at the external auditory meatus (EAM) with 12˚ cephalic angulation

Respiration: suspended

Position:

1. The patient is placed either in an erect position or in a semi-prone position.
2. Adjust the head to align the Interpapillary Line (IPL) perpendicular to the IR and to align the midsagittal plane (MSP) parallel to the IR.
3. Align the Inferior orbitomeatal line (IOML) parallel to the horizontal axis of image receptor (IR).
4. Place the filming temporal bone on the IR and rotate the head 45° to the IR.
5. Place the temporal bone at the center of IR and place the patient's cheek on the IR

Collimation: Include all structures of temporal bone from petrous ridge to mastoid process.

Evaluation

1. The entire structures of temporal bone including petrous ridge, internal acoustic meatus, and mastoid air cell must be clearly visible.
2. The anterior side of the petrous ridges should be shown clearly without distortion.
3. Bony labyrinth and tympanic cavity should be shown below the petrous ridge.

kVp:75, mAs:20

Tip

1. Temporal Bone Axiolateral (Arcelin) Projection is used as a replacement inspection when patient cannot pose semi-prone position.
2. It is usual to take twice in order to compare bilateral temporal bones.
3. It is hard to maintain the pose for patient; the inspection must be done in a short time.
4. Cone is recommended to use for this inspection.

X-Ray Temporal Bone Positioning: