Ch. 16 The patient as a Beam Emitter (Exp II)

Question 1

X-rays are attenuated:

Answer 1

Exponentially

Question 2

The ____ the body part, the ____ the attenuation.

Answer 2

Thicker; greater

Question 3

Which of the following elements would attenuate a greater percentage of the x-ray beam?

a. Hydrogen
b. Calcium
c. Oxygen
d. Carbon

Answer 3

b. Calcium

Question 4

Which of the following elements would attenuate a lesser percentage of the x-ray beam?

a. Hydrogen
b. Barium
c. Oxygen
d. Carbon

Answer 4

Hydrogen

Question 5

Attenuation is greater for elements with more ____ with which the photons may interact.

Answer 5

Electrons

Question 6

Bone produces less image receptor ____ because it attenuates the x-ray beam more than soft tissue does.

Answer 6

Exposure

Question 7

For the same exposure intensity, air produces:

Answer 7

Greater exposure intensity to the receptor than other materials

Question 8

Which of the following is the greatest attenuator of the x-ray beam?

a. Pneumonic lung
b. Pericardial fat
c. Psoas muscle
d. Perirenal fat

Answer 8

c. Psoas muscle

Question 9

Which of the following is the least attenuator of the x-ray beam?

a. Pneumonated lung
b. Pericardial fat
c. Psoas muscle
d. Perirenal fat

Answer 9

a. Pneumonated lung

Question 10

As subject density ____, image receptor exposure _____.

Answer 10

Increases; decreases

Question 11

The degree of differential absorption is referred to as:

Answer 11

Subject contrast

Question 12

The recorded detail of a structure is dependent on:

Answer 12

• Its position within the body
• The placement of the body in relationship to the film
• The size of the part

Question 13

Distortion is the misrepresentation of the ____ of an object.

Answer 13

• Length
• Width
• Shape

Question 14

The primary source of radiation exposure for occupational personnel is due to:

Answer 14

Compton scatter

Question 15

Because of its tissue composition, the human breast:

Answer 15

Is a low subject contrast structure

Question 16

With the patient in the posterior-anterior (PA) projection of the abdomen (prone),

Answer 16

The anterior ribs would have high resolution

Question 17

All of the following refer to patient factors contributing to image quality EXCEPT:

a. Receptor contrast
b. Subject detail
c. Subject contrast
d. Tissue density

Answer 17

a. Receptor contrast

Question 18

With the perfusion of iodinated contrast material into the kidneys,

Answer 18

A greater degree of photoelectric interactions will occur in the kidneys.

Question 19

All of the following are related EXCEPT:

a. Air
b. Barium
c. Fat
d. Bone

Answer 19

b. Barium

Question 20

All of the following are true of Compton scatter EXCEPT:

a. It contributes no meaningful information to the final image
b. Its production increases as tissue density increases
c. It is a significant contributor to occupational radiation exposure
d. Most of the final image is the result of Compton scatter

Answer 20

b. Its production increases as tissue density increases

Question 21

Clinically speaking from a diagnostic viewpoint, the only useful radiation exposure is that radiation:

Answer 21

Detected by the receptor

Question 22

With a patient in the supine position, the anatomical structure that would demonstrate the greatest subject detail would be the:

a. Nasal bones
b. Sternum
c. Vertebral pedicles
d. Spinous processes

Answer 22

d. Spinous processes