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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| show | Rotation
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| Which specific positioning error(s) is/are present if the Petrous Ridges are projected higher in the orbits then expected for a 15 degree axial projection. What is the positioning error if there's lack of symmetry of the Petrous ridges? | show 🗑
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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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| Which skull projection best demonstrates the Sella Turcica in profile? | show 🗑
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| Which imaging modality is usually performed on neonates with a possible intracranial hemmorhage? | show 🗑
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| What are the 5 most common errors made during skull radiography? Which 2 of those are the most common? | show 🗑
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| show | Lateral
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| Which focal spot is used for skull projections? | show 🗑
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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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| show | Aligning the IOML parallel to the transverse axis of the IR
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| What is the general centeriong point for the CR on a lateral skull? | show 🗑
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| What can be used to assess for rotation on a lateral skull radiograph? | show 🗑
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| What can be used to asses for tilt on a lateral skull radiograph? | show 🗑
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| Why must a paient be cleared from a X-table lateral C-spine prior to performing a x-table lateral skull? | show 🗑
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| show | CR angled 15 degrees caudad to the OML. The CR should exit at the Nasion.
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| What can be used to assess that patient is in the correct position for a PA (caldwell) Axial Skull projection? What's used to assess for rotation? | show 🗑
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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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| What can be assessed on the PA Axial (Caldwell) and AP Axial (Reverse Caldwell) radiograph's to be sure the patient and CR is in the correct position? What can be done to correct it? | show 🗑
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| show | Equal distance from mid lateral orbital margins to lateral wall of cranium on each side to assess for rotation.
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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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| What is a tumor that may produce erosion of the Sella Turcica? | show 🗑
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| What's another name for Osteitis Deformans? | show 🗑
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| show | Multiple Myeloma
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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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