Placing a Marker Directly on the Tabletop

Multiple Choice

Placing a marker directly on the tabletop
1) avoids marker distortion and magnification.
2) prevents scatter radiation from undercutting the marker.
3) ensures the marker will not be projected off the IR.
4) attenuates most but not all of the incident x-rays.

A) 1 and 2 only
B) 2 and 4 only
C) 1, 2, and 3 only
D) 1, 2, 3, and 4