Author Question: The central ray for the PA/AP oblique projections for the c-spine is directed to: C5 and MCP C5 ... (Read 53 times)

go.lag · **on:** Jul 17, 2018

The central ray for the PA/AP oblique projections for the c-spine is directed to:

C5 and MCP
C5 and MSP
C5 and midway between the MSP and lateral margin
the C3 and midway between MSP and lateral margin

Question 2

Where is the central ray for the lateral skull projection directed?

level of the EAM
midway between the outer canthus and EAM
superior to the level of the EAM
posterior to the EAM

otokexnaru · **Reply #1 on:** Jul 17, 2018

Answer to Question 1

C5 and midway between the MSP and lateral margin

Rationale: The CR for the AP/PA oblique projections of the c-spine is directed to the level of C5 and between the margins of the MSP and the lateral margin on the upside of the patient.

Answer to Question 2

superior to the level of the EAM

Rationale: The central ray is directed 1-2 inches superior to the EAM (external auditory meatus) in order to include the vertex of the skull. The lateral skull must include the frontal bone, vertex, and occipital bone.