Chapter 11: Scatter Radiation

Question 1

The degree of difference in OD between areas of a radiographic image

Answer 1

Contrast

Question 2

Is the ability to image and distinguish soft tissues

Answer 2

Contrast Resolution

Question 3

Reduced image contrast results from

Answer 3

Scattered x-rays

Question 4

If you could image a long bone in cross section “using only transmitted, unscattered x-rays”, the image would be very sharp. Therefore, __________

Answer 4

Image contrast would be high

Question 5

Only scatter radiation and no transmitted x-rays reached the imaged receptor, “the image would be dull gray”.

Answer 5

Contrast would be very low.

Question 6

Image forming x-rays “consist of both transmitted and scattered x-rays”.

Answer 6

The image would have moderate contrast

Question 7

“Two types of devices reduce the amount of scatter” radiation that reaches the image receptor

Answer 7

Beam restrictors and grids

Question 8

X-rays that exit from the patient are remnant x-rays and those that exit and interact with the image receptor are called

Answer 8

Image-forming x-rays.

Question 9

Proper collimation ______the patient dose and______ contrast

Answer 9

Reduces, improves

Question 10

As scatter radiation______, the radiographic image______

Answer 10

Increases, decreases

Question 11

Beam Restrictors

Answer 11

APERTURE DIAPHRAGM
CONES&CYLINDERS
VARIABLE APERTURE COLLIMATOR

Question 12

“Three primary factors” influence the relative intensity of scatter radiation that reaches the image receptor:

Answer 12

kVp, field size, and Patient Thickness

Question 13

As x-ray energy is______ the absolute number of Compton interactions_______but the number of photoelectric interactions________ much more rapidly

Answer 13

Increased, decreases, decreases

Question 14

__________ of x-rays incident on the patient reach the image receptor

Answer 14

Approximately 1%

Question 15

Scatter radiation_______ as the x-ray beam field size______

Answer 15

Increases, increases