Question

what is the recommended central ray entrance point for a lateral projection of the 1st digit?
3rd metacarpophalangeal (mcp) joint
1st carpometacarpal (cmc) joint
1st interphalangeal (ip) joint
1st metacarpophalangeal (mcp) joint

Explanation:

In radiography of the 1st digit (thumb), for a lateral projection, the central ray is typically directed to the 1st metacarpophalangeal (MCP) joint to properly visualize the structures of the thumb.

Answer:

D. 1st metacarpophalangeal (MCP) joint