A form of beam restriction that is a circular, metal piece ...

[dbose]

A form of beam restriction that is a circular, metal piece attached to the tube housing that can be extended is:
 
 PBL
  wedge filter
  an aperture diaphragm
  an extension cone

Question 2

Maximum depression of the shoulders for the lateral c-spine is achieved with:
 
 no weights and taken upon expiration
  no weights and taken upon inspiration
  weights and taken upon inspiration
  weights and taken upon expiration

[elyse44]

Answer to Question 1

an extension cone

Rationale: Extension cones attach to the tube head. Cones may be cylinder or flare type. Extension cones are able to telescope out and come in different diameters to alter the field size.

Answer to Question 2

weights and taken upon expiration

Rationale: Maximum depression is achieved by acquiring the image after deep exhalation. If safe and tolerable for the patient, 5-10 pound weights can be secured to the patient's wrists.

[dbose]

Thanks for the timely response, appreciate it

[amcvicar]

Great answer, keep it coming