LRA 226 week 1 Questions with Verified
Answers Graded A+
A radiograph of a posteroanterior (PA) axial projection (Caldwell method) of the cranium reveals that
the petrous ridges are located at the level of the lower one third of the orbits. The technologist
performed this projection with the CR angled 15° caudal to the orbitomeatal line (OML). How must
positioning be altered if a repeat exposure is performed?
positioning was correct
A PA axial projection with a 25° caudad angle of the cranium reveals that the petrous ridges are at the
level of the superior orbital margins. What modification is required to correct this error?
Increase extension of the cranium
A radiograph of a PA caldwell projection reveals that the petrous ridges are projected into the lower ⅓
of the maxillary sinuses which of the following modifications should be made during the repeat
exposure to make a more diagnostic image?
decrease extension of the head and neck
A patient comes to radiology for a routine study of the cranium he is unable to flex his head or neck
sufficiently to place the OML perpendicular to the IR for the ap axial projection. What should the tech do
to compensate for this problem without creating excessive magnification of the occipital bone?
Use the IOML and increase angulation by 7 degrees
Answers Graded A+
A radiograph of a posteroanterior (PA) axial projection (Caldwell method) of the cranium reveals that
the petrous ridges are located at the level of the lower one third of the orbits. The technologist
performed this projection with the CR angled 15° caudal to the orbitomeatal line (OML). How must
positioning be altered if a repeat exposure is performed?
positioning was correct
A PA axial projection with a 25° caudad angle of the cranium reveals that the petrous ridges are at the
level of the superior orbital margins. What modification is required to correct this error?
Increase extension of the cranium
A radiograph of a PA caldwell projection reveals that the petrous ridges are projected into the lower ⅓
of the maxillary sinuses which of the following modifications should be made during the repeat
exposure to make a more diagnostic image?
decrease extension of the head and neck
A patient comes to radiology for a routine study of the cranium he is unable to flex his head or neck
sufficiently to place the OML perpendicular to the IR for the ap axial projection. What should the tech do
to compensate for this problem without creating excessive magnification of the occipital bone?
Use the IOML and increase angulation by 7 degrees
