Chapter 6

Question 1

Motion destroys

Answer 1

Resolution

Question 2

Blur Will occur if the cassette is moved

Answer 2

during exposure

Question 3

Blur Will occur if the patient moves

Answer 3

during the exposure

Question 4

Distortion

Answer 4

Foreshortening or elongation due to angulation

Question 5

The central ray is directed at what degree

Answer 5

90

Question 6

The use of collimation and grids reduces

Answer 6

scattered/ secondary radiation

Question 7

Filtration eliminates

Answer 7

a certain amount of secondary radiation and prevents most of the scattered radiation

Question 8

Resolution

Answer 8

differentiate fine details within the x-ray image

Question 9

blur can be useful by

Answer 9

imagining a particular body part that is obscured by overlying anatomical features

Question 10

Disotiation can be useful when

Answer 10

one body part obscures the area on interest

Question 11

Distortion isnt useful when

Answer 11

results in elongation or foreshortening of the ROI

Question 12

Shape distortion can occur when

Answer 12

from inaccurate positioning of the central ray

Question 13

(SID)

Answer 13

Source image distance

Question 14

(SOD)

Answer 14

Source-to-object distance

Question 15

(OID)

Answer 15

Object-to-image distance

Question 16

Grid installation

Answer 16

Location
Replacement

Question 17

Grid positioning

Answer 17

Centered and flat

Question 18

Effect of a grid on technical factors

Answer 18

Compensation for absorption of some primary beam

Question 19

Increase in body size x-rayed requires more kV
Results in

Answer 19

Greater scattered/secondary radiation
* More fog, reduced contrast (flat looking image)