Deck 16: The Patient As a Beam Emitter

Question 1

The incident beam is significantly altered as it passes through the patient.

Answer 1

True

Question 2

Shape distortion can be the result of a patient's body habitus.

Answer 2

True

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

calcium

Question 4

As subject density ____, image receptor exposure ____.

A)increases; remains the same
B)decreases; decreases
C)increases; increases
D)increases; decreases

Question 5

The relationship between radiographic contrast and the patient is termed subject contrast.

Question 6

Subject distortion can be reduced by accurately positioning the patient.

Question 7

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

A)detail
B)contrast
C)exposure
D)distortion

Question 8

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

A)electrons
B)protons
C)neutrons
D)positrons

Question 9

The patient has an impact on all the properties that affect radiographic quality.

Question 10

The ____ the body part, the ____ the attenuation.

A)more dense; less
B)thinner; greater
C)thicker; less
D)thicker; greater

Question 11

Subject distortion occurs naturally.

Question 12

The relationship between radiographic quality and the patient is termed image receptor exposure.

Question 13

For the same exposure intensity, air produces

A)less exposure intensity to the receptor than other materials.
B)greater exposure intensity to the receptor than other materials.
C)the same exposure intensity to the receptor as other materials.
D)less exposure intensity due to the high degree of photoelectric absorption.

Question 14

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

Question 15

Subject density refers to the impact the patient has on the resulting radiographic contrast.

Question 16

The beam emitted from the patient contains diagnostic information.

Question 17

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

A)hydrogen
B)barium
C)oxygen
D)carbon

Question 18

X-rays are attenuated

A)exponentially.
B)linearly.
C)as a function of the oxygen state of the tissues.
D)as a function of mAs.

Question 19

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

Question 20

The relationship between image receptor exposure and the patient is termed subject density.

Question 21

Match the following terms with the statements as they relate to the patient as an x-ray beam factor.
Larger patients impact this negatively.

A)Compton scatter
B)photoelectric effect
C)12.31
D)air
E)fat
F)water
G)bone
H)chest
I)subject detail
J)subject density

Question 22

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

A)absorbed in the patient.
B)produced from Compton interactions.
C)detected by the receptor.
D)intercepted by the radiographic grid.

Question 23

The recorded detail of a structure is dependent on

A)its position within the body.
B)the placement of the body in relationship to the film.
C)the size of the part.
D)all of the above

Question 24

With the perfusion of iodinated contrast material into the kidneys,

A)a greater degree of Compton scatter is produced from the kidneys.
B)the kidneys will demonstrate lower subject contrast.
C)a greater degree of photoelectric interactions will occur in the kidneys.
D)none of the above

Question 25

All of the following are true of Compton scatter EXCEPT:

A)It contributes no meaningful information 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.

Question 26

Match the following terms with the statements as they relate to the patient as an x-ray beam factor.
total photon absorption

A)Compton scatter
B)photoelectric effect
C)12.31
D)air
E)fat
F)water
G)bone
H)chest
I)subject detail
J)subject density

Question 27

Match the following terms with the statements as they relate to the patient as an x-ray beam factor.
low attenuation

A)Compton scatter
B)photoelectric effect
C)12.31
D)air
E)fat
F)water
G)bone
H)chest
I)subject detail
J)subject density

Question 28

Match the following terms with the statements as they relate to the patient as an x-ray beam factor.
6.46

A)Compton scatter
B)photoelectric effect
C)12.31
D)air
E)fat
F)water
G)bone
H)chest
I)subject detail
J)subject density

Question 29

Distortion is the misrepresentation of the ____ of an object.

A)length
B)width
C)shape
D)all of the above

Question 30

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

A)renal stones would have high resolution.
B)the lumbar vertebrae would have high resolution.
C)the psoas muscles would have high resolution.
D)the anterior ribs would have high resolution.

Question 31

Match the following terms with the statements as they relate to the patient as an x-ray beam factor.
reduces image quality

A)Compton scatter
B)photoelectric effect
C)12.31
D)air
E)fat
F)water
G)bone
H)chest
I)subject detail
J)subject density

Question 32

Match the following terms with the statements as they relate to the patient as an x-ray beam factor.
bone

A)Compton scatter
B)photoelectric effect
C)12.31
D)air
E)fat
F)water
G)bone
H)chest
I)subject detail
J)subject density

Question 33

Match the following terms with the statements as they relate to the patient as an x-ray beam factor.
Subject contrast is high.

A)Compton scatter
B)photoelectric effect
C)12.31
D)air
E)fat
F)water
G)bone
H)chest
I)subject detail
J)subject density

Question 34

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.

Question 35

The degree of differential absorption is referred to as

A)radiographic contrast.
B)subject contrast.
C)image receptor exposure.
D)subject density.

Question 36

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.

Question 37

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

A)Compton scatter.
B)classical scatter
C)photoelectric effect.
D)coherent scatter.

Question 38

All of the following are related EXCEPT

A)air.
B)barium.
C)fat.
D)bone.

Question 39

Because of its tissue composition, the human breast

A)is a high subject contrast structure.
B)yields a high contrast image.
C)is a low subject contrast structure.
D)is considered a high-attenuator of x-ray energy.

Question 40

Match the following terms with the statements as they relate to the patient as an x-ray beam factor.
basic composition of the liver

A)Compton scatter
B)photoelectric effect
C)12.31
D)air
E)fat
F)water
G)bone
H)chest
I)subject detail
J)subject density