LRA 226 Quiz 1 - Study Guide UPDATED ACTUAL Questions
and CORRECT Answers
Total number of skull bones? 22
Difference in degrees between OML and IOML? 7-8 degrees
Projection that requires sagittal plane to be parallel to IR Left/Right Lateral - Skull Series
and IPL perpendicular to IR?
How can the tech compensate for a patient that is unable Align IOML perpendicular to IR, add radiolucent support under head if needed
to flex head/neck sufficiently to place OML perpendicular CR angle increased to 37 degrees caudal
to IR for AP Axial projection?
Positioning line that should be perpendicular to IR for AP Infraorbitomeatal Line
Axial Townes with 37 degrees caudal angle?
PA Caldwell projection reveals the petrous ridges are Increased extension of the cranium
projected in the lower 1/3 of maxillary sinuses. For a repeat
exposure what modification can be made?
Positioning error that most often results in repeat exposure Rotation
of the cranium?
Define EAM: External Auditory Meatus; the opening or canal of the external ear
EAM stands for? External Auditory Meatus
PA Axial projection with 25 degrees caudal reveals petrous Increase extension of the cranium
ridges at the level of the superior orbital margins. What
modification is required to correct the error?
How is tilt evident on a Lateral Skull radiograph? By superior and inferior separation of the orbital plates and greater wings of
sphenoid bone
(symmetric horizontal structures)
and CORRECT Answers
Total number of skull bones? 22
Difference in degrees between OML and IOML? 7-8 degrees
Projection that requires sagittal plane to be parallel to IR Left/Right Lateral - Skull Series
and IPL perpendicular to IR?
How can the tech compensate for a patient that is unable Align IOML perpendicular to IR, add radiolucent support under head if needed
to flex head/neck sufficiently to place OML perpendicular CR angle increased to 37 degrees caudal
to IR for AP Axial projection?
Positioning line that should be perpendicular to IR for AP Infraorbitomeatal Line
Axial Townes with 37 degrees caudal angle?
PA Caldwell projection reveals the petrous ridges are Increased extension of the cranium
projected in the lower 1/3 of maxillary sinuses. For a repeat
exposure what modification can be made?
Positioning error that most often results in repeat exposure Rotation
of the cranium?
Define EAM: External Auditory Meatus; the opening or canal of the external ear
EAM stands for? External Auditory Meatus
PA Axial projection with 25 degrees caudal reveals petrous Increase extension of the cranium
ridges at the level of the superior orbital margins. What
modification is required to correct the error?
How is tilt evident on a Lateral Skull radiograph? By superior and inferior separation of the orbital plates and greater wings of
sphenoid bone
(symmetric horizontal structures)
