The Compilation

Question 1

Increasing kVp by 15% results in an increase in patient exposure of approx:

Answer 1

33%

Question 2

The absorption and scattering of the x-ray beam as it passes through the body is best referred as:

Answer 2

attenuation

Question 3

The signal to noise ratio should always be greater than the

Answer 3

1

Question 4

At high kVp levels, which interaction of photons with matter is most likely to take place?

Answer 4

Compton

Question 5

An incident x-ray photon within the patient has 106 kV of energy. An L-Shell electron with a BE of 3 kV speeds away from the atom, carrying 4 kV of kinetic energy. A Compton scattered photon from this interaction must have _____ of energy.

Answer 5

99 kV

Question 6

Which x-ray interaction within the patient results in total absorption of the photon’s energy, and leaves a microscopic “white” spot wherever it occurs in the resulting image?

Answer 6

Photoelectric interaction

Question 7

Increasing this technical factor will only lead to an increase in x-ray beam intensity to the IR and will not affect other factors such as contrast or detail:

Answer 7

mAs

Question 8

Ionization does not occur in which one of the following?

-Photoelectric Absorption
-Compton Scatter
-Coherent Scatter
-Ionization does not occur in any of these interactions?

Answer 8

Coherent Scatter

Question 9

What is the magnification factor of magnification of an object imaged with an SID of 72” and an OID of 8”

Answer 9

1.125

Question 10

The sharpness in an image is affected by all of the following EXCEPT:

mAs
SOD
OID
focal spot size

Answer 10

mAs

Question 11

Compton Effect

Answer 11

The energy of the incident x-ray photon is partially absorbed by an outer-shell electron, which is then ejected from the atom as a recoil electron.

Question 12

Milliamperage is a unit for measuring the:

Answer 12

Electrical current flowing during an exposure.

Question 13

In order to adjust radiographic technique to compensate for a body part that is 4 cm thicker than average, mAs should be:

Answer 13

Increased by 100%

Question 14

A 10kV photon undergoes a coherent scattering interaction with an orbital electron having a BE of 2kV. What is the energy of the resulting scattered photon?

Answer 14

10 kV

Coherent has the same number of energy going out as it did going in. Temporarily absorbed by the atom and then exits the body as a scatter photon with same energy the x-ray photon had before entering.

Question 15

A photon with slightly more energy than the binding energy of the tissue through which it passes will most likely interact by:

Answer 15

Photoelectric effect

Question 16

A kidney that measures 6 cm is radiographed using an SID of 48 and an SOD of 40. How many centimeters will the kidney measure on the completed radiograph?

Answer 16

7.2 cm

Question 17

What exposure factor regulates x-ray beam quality?

Answer 17

kVp

Question 18

Approximately what percentage of the x-ray beam is absorbed for every 4 cm of tissue as it passes through the body

Answer 18

50%

Question 19

Smaller focal spot sizes result in less

Which one:
A. Magnification.
B. Off focus radiation.
C. Occupational exposure.
D. Penumbra

Answer 19

Penumbra

Question 20

Grids should generally be used for anatomy thicker than

Answer 20

10cm

Question 21

Why would a rad tech use a small focal spot while performing a radiographic examination? Pick one:

A. Increase the penumbra
B. Obtain fine details
C. Increase magnification of the image
D. Reduce exposure to the patient

Answer 21

Obtain fine details

Question 22

Which of the following conditions would require a decrease in radiographic technique?

Cirrhosis
Osteopetrosis
Bowel obstruction
Hydrocephalus

Answer 22

Bowel obstruction

Question 23

The Lightfield can deviate from the radiation field by ____ of SID

Answer 23

2%

Question 24

With all other factors remain remaining the same, if .5 mm of filtration is added to the Primary beam, this factor will INCREASE

Answer 24

Average KVP