RTE 1401 Essentials of Radiographic Physics &
Imaging Final Practice Test Exam Questions
and Answers 2025 Updated |QUESTIONS WITH
WELL EXPLAINED ANSWERS
The type of grid that is permanently mounted but includes a channel for the IR to
slide into is the
a. wafer grid
b. bucky
c. grid cap
d. grid cassette - ✔✔- ANSWER-✔✔-grid cap
Rationale for the correct answer:
The correct answer is c. grid cap.
A grid cap is a type of grid that is permanently mounted but includes a channel
where the IR (image receptor) can slide into. It is often used in radiology to hold
the grid in place, ensuring that it stays positioned correctly while allowing the IR
to move in and out of the channel for positioning. The grid cap has the specific
feature of a channel for the IR, which distinguishes it from other types of grids.
Which of the following is not a type of interaction between x-radiation and
biologic matter?
,a. Compton scattering
b. Bremsstrahlung
c. Pair Production
d. Photoelectric absorption - ✔✔- ANSWER-✔✔-Bremsstralung
Rationale for the correct answer:
The correct answer is b. Bremsstrahlung.
Bremsstrahlung is not a type of interaction between x-radiation and biological
matter. Instead, Bremsstrahlung refers to the interaction that occurs when high-
speed electrons are decelerated or deflected by atomic nuclei, causing the
production of x-rays. This occurs primarily in the x-ray tube as part of the x-ray
production process, rather than in interactions with biological tissues.
Microwaves heat up food because their energy causes the atoms and molecules
to
a. dissolve
b. expand
c. vibrate
d. contract - ✔✔- ANSWER-✔✔-vibrate
Rationale for the correct answer:
The correct answer is c. vibrate.
,Microwaves heat food by causing the molecules (particularly water molecules) in
the food to vibrate. Microwaves are a form of electromagnetic radiation, and
when they penetrate food, they specifically interact with polar molecules, like
water. These polar molecules are able to absorb the microwave energy and begin
to rotate and vibrate rapidly. This molecular motion generates heat, which is what
warms up the food.
In LCD monitors, the number of TFT's is equal to the
a. number of crystals in the liquid crystal layer
b. number of pixels displayed
c. Lp/mm of resolution
d. display line system - ✔✔- ANSWER-✔✔-number of pixels displayed
Rationale for the correct answer:
The correct answer is b. number of pixels displayed.
In LCD (Liquid Crystal Display) monitors, each TFT (Thin-Film Transistor) controls
one pixel on the screen. TFTs are part of the active matrix, which is used to
individually control each pixel's color and brightness. The number of TFTs
corresponds to the number of pixels displayed on the screen, as each pixel needs
a transistor to control its state. Therefore, the number of TFTs is equal to the
number of pixels displayed in the monitor.
, Scatter control has ________ importance with digital imaging as compared with
film-screen
a. less
b. more
c. the same - ✔✔- ANSWER-✔✔-more
Rationale for the correct answer:
The correct answer is b. more.
Scatter control plays more of an important role in digital imaging as compared to
film-screen radiography. Here's why:
1. Digital Imaging Sensitivity: Digital systems, such as CR (Computed
Radiography) and DR (Digital Radiography), have higher sensitivity to
scatter radiation. This means that even small amounts of scatter can
degrade the quality of the image, making it less clear and harder to
interpret. The digital detectors are more sensitive to both the primary and
scatter radiation, and scatter can reduce the signal-to-noise ratio (SNR),
resulting in a noisy and less detailed image.
2. Dynamic Range: Digital imaging has a wide dynamic range, allowing it to
capture a larger range of intensities. However, if scatter is not controlled, it
can fill in the dark areas of the image, making the distinction between low-
and high-density areas less clear. This makes scatter control critical in
maintaining image quality.
3. Film-Screen Systems: In traditional film-screen radiography, scatter control
is still important, but the film has a lower dynamic range compared to
digital detectors, and it is less sensitive to low amounts of scatter.
Therefore, although scatter control is still necessary to prevent fogging of
the image, it’s not as critical as in digital systems.
Imaging Final Practice Test Exam Questions
and Answers 2025 Updated |QUESTIONS WITH
WELL EXPLAINED ANSWERS
The type of grid that is permanently mounted but includes a channel for the IR to
slide into is the
a. wafer grid
b. bucky
c. grid cap
d. grid cassette - ✔✔- ANSWER-✔✔-grid cap
Rationale for the correct answer:
The correct answer is c. grid cap.
A grid cap is a type of grid that is permanently mounted but includes a channel
where the IR (image receptor) can slide into. It is often used in radiology to hold
the grid in place, ensuring that it stays positioned correctly while allowing the IR
to move in and out of the channel for positioning. The grid cap has the specific
feature of a channel for the IR, which distinguishes it from other types of grids.
Which of the following is not a type of interaction between x-radiation and
biologic matter?
,a. Compton scattering
b. Bremsstrahlung
c. Pair Production
d. Photoelectric absorption - ✔✔- ANSWER-✔✔-Bremsstralung
Rationale for the correct answer:
The correct answer is b. Bremsstrahlung.
Bremsstrahlung is not a type of interaction between x-radiation and biological
matter. Instead, Bremsstrahlung refers to the interaction that occurs when high-
speed electrons are decelerated or deflected by atomic nuclei, causing the
production of x-rays. This occurs primarily in the x-ray tube as part of the x-ray
production process, rather than in interactions with biological tissues.
Microwaves heat up food because their energy causes the atoms and molecules
to
a. dissolve
b. expand
c. vibrate
d. contract - ✔✔- ANSWER-✔✔-vibrate
Rationale for the correct answer:
The correct answer is c. vibrate.
,Microwaves heat food by causing the molecules (particularly water molecules) in
the food to vibrate. Microwaves are a form of electromagnetic radiation, and
when they penetrate food, they specifically interact with polar molecules, like
water. These polar molecules are able to absorb the microwave energy and begin
to rotate and vibrate rapidly. This molecular motion generates heat, which is what
warms up the food.
In LCD monitors, the number of TFT's is equal to the
a. number of crystals in the liquid crystal layer
b. number of pixels displayed
c. Lp/mm of resolution
d. display line system - ✔✔- ANSWER-✔✔-number of pixels displayed
Rationale for the correct answer:
The correct answer is b. number of pixels displayed.
In LCD (Liquid Crystal Display) monitors, each TFT (Thin-Film Transistor) controls
one pixel on the screen. TFTs are part of the active matrix, which is used to
individually control each pixel's color and brightness. The number of TFTs
corresponds to the number of pixels displayed on the screen, as each pixel needs
a transistor to control its state. Therefore, the number of TFTs is equal to the
number of pixels displayed in the monitor.
, Scatter control has ________ importance with digital imaging as compared with
film-screen
a. less
b. more
c. the same - ✔✔- ANSWER-✔✔-more
Rationale for the correct answer:
The correct answer is b. more.
Scatter control plays more of an important role in digital imaging as compared to
film-screen radiography. Here's why:
1. Digital Imaging Sensitivity: Digital systems, such as CR (Computed
Radiography) and DR (Digital Radiography), have higher sensitivity to
scatter radiation. This means that even small amounts of scatter can
degrade the quality of the image, making it less clear and harder to
interpret. The digital detectors are more sensitive to both the primary and
scatter radiation, and scatter can reduce the signal-to-noise ratio (SNR),
resulting in a noisy and less detailed image.
2. Dynamic Range: Digital imaging has a wide dynamic range, allowing it to
capture a larger range of intensities. However, if scatter is not controlled, it
can fill in the dark areas of the image, making the distinction between low-
and high-density areas less clear. This makes scatter control critical in
maintaining image quality.
3. Film-Screen Systems: In traditional film-screen radiography, scatter control
is still important, but the film has a lower dynamic range compared to
digital detectors, and it is less sensitive to low amounts of scatter.
Therefore, although scatter control is still necessary to prevent fogging of
the image, it’s not as critical as in digital systems.
