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Author Question: Which of the following is not a form of beam restriction? collimators wedge filter cones ... (Read 62 times)

washai

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on: Jul 17, 2018
Which of the following is not a form of beam restriction?
 
 collimators
  wedge filter
  cones
  aperture diaphragms

Question 2

Which of the following factors would not indicate the need for a grid?
 
 higher kVp
  a thicker part
  increased SID
  increased OID


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jesse.fleming

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Reply #1 on: Jul 17, 2018
Answer to Question 1

wedge filter

Rationale: A wedge filter will not serve as a means of beam restriction, but rather a means to create a more uniform density on parts of uneven part thickness, e.g., foot, t-spine.

Answer to Question 2

increased SID

Rationale: A grid is suggested with parts measuring over 10 cm and with higher kVp. Increased kVp values influence the amount of scatter radiation produced. In cases where increased OID is a factor with a thicker part, the theory of the air-gap technique could apply, avoiding the need for a grid.


washai

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Reply 2 on: Jul 17, 2018
Excellent

ttt030911

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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