Author Question: All of the following are beam limiting devices except: filtration aperture diaphragms PBL ... (Read 63 times)

chads108 · **on:** Jul 17, 2018

All of the following are beam limiting devices except:

filtration
aperture diaphragms
PBL
extension cones

Question 2

The plantodorsal axial calcaneus should demonstrate the:

calcaneus and calcaneocuboid joint
calcaneus and tibiotalar joint
calcaneus and subtalar joint
calcaneus and tibiofibular joint

Hikerman221 · **Reply #1 on:** Jul 17, 2018

Answer to Question 1

filtration

Rationale: Beam restriction is the single most important factor to minimize patient dose. Manual collimation, PBL, extension cones, and aperture diaphragms are all means to restrict the primary beam.

Answer to Question 2

calcaneus and subtalar joint

Rationale: The plantodorsal axial should demonstrate the entire calcaneus well with even density, but also show penetration of the subtalar or talocalcaneal joint.