Skull Positioning Week 3 & 4
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Which specific positioning error is present if the mandibular rami ar not superimposed on a lateral skull radiograph? | show 🗑
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| show | Excessive flexion at the neck, or too much angle on CR. Rotation.
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| Where will the Petrous Ridges be projected with a 15 degree PA axial (Caldwell) projection on the cranium. | show 🗑
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| show | 3/4" anterior & 3/4 superior to EAM. Will demonstrate the anterior & posterior Clinoid process with no divergence.
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| show | Lateral skull.
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| show | Ultrasound
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| show | Rotation, Tilt, Excessive Flexion, Excessive Extension, Incorrect CR angulation. Rotation & Tilt are the most common.
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| Which skull projection best demonstrates the Clivus in profile? | show 🗑
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| show | Small focal spot.
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| show | Aligning Mid Sagittal Plane parallel to the IR is primary. The Glabella and Inion should be equal distance to the IR.
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| What is the primary control of tilt for a lateral skull? | show 🗑
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| What positioning lines can be used to position skull directly in the center of the IR for a lateral skull? | show 🗑
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| show | CR centered 45 degrees anterosuperior 1" from TEA (diagonal).
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| show | The posterior edge of the Rt & Lt mandibular rami should be superimposed.
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| What can be used to asses for tilt on a lateral skull radiograph? | show 🗑
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| show | Because the patient's head must be lifted up to place a sponge underneath the patient's head for the x-table lateral skull.
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| show | CR angled 15 degrees caudad to the OML. The CR should exit at the Nasion.
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| show | Face flat to IR with head flexed. Check that OML is perpendicular to the IR. Align MId Sagittal Plane perpendicular to IR. The Mastoid Tips should be equidistant to determine rotation. The ankles can be tugged to line the patient up.
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| What alternate projection can be used on a trauma/unconcious patient instead of a PA Axial (Caldwell) skull? How much and which direction is the CR angled? Where is it centered? | show 🗑
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| show | The Petrous Pyramids should be projected into the lower 1/3 of the orbits. CR angle may be too little, or too much. Or the OML may not be truly perpendicular to the IR.
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| What is used to assess for rotation on the PA Axial (Caldwell or AP Axial (Reverse Caldwell) radiograph's? | show 🗑
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| When using a 30 degree caudad angle for the AP axial (Towne Method) projection of the skull, which positioning line should be perpendicular to the IR? Which cranial bone is best demonstrated with the Towne Method? | show 🗑
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| show | Basal Skull Fracture
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| What is a destructive lesion with irregular margins? | show 🗑
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| What is another name for a "PIng Pong" fracture? | show 🗑
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| show | Pituitary Adenoma
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| What's another name for Osteitis Deformans? | show 🗑
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| What's the name for a tumor that originates in the bone marrow? | show 🗑
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| Does Paget's disease require an increase in exposure factors? | show 🗑
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| On a properly positioned AP Axial (Towne's Method) projection, where should the Dorsum Sellae be placed into the middle aspect of? | show 🗑
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| If the patient cannot flex their neck to bring the OML perpendicular to the IR, what positioning line can the technologist bring perpendicular to the IR and how much CR angle? | show 🗑
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| show | 2" superior to the EAM, halfway between the Frontal Eminence and the Inion, or $5 degrees anterosuperior (diagonal) from the TEA. For the Sella Turcica the CR should be centered 3/4" anterosuperior to the EAM.
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| show | The IOML
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| What CR angle must be maintained for the AP Axial (Towne's Method) projection? How much angle should be used when positioning the IOML perpendicular to the IR? Where is the centering for the Towne's? Which part should the CR traverse through? | show 🗑
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| show | A PA axial skull with the CR angled 25-30 degrees cephalic. CR should exit 1 1/2" superior to the Nasion.
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