Diagnostic Imaging Sample Questions Flashcards
After soaking in the developer, the next step in developing a radiograph is the:
a) wash bath
b) fixer
c) rinse bath
d) dryer
c) rinse bath
After the radiograph has been soaked in the developer, it is placed in the rinse bath, which stops the development process and prevents the fixer from becoming contaminated. The wash bath is used after the fixer to remove any processing chemicals from the film. The fixer follows the rinse bath. The dryer is the final step in the development process.
Which physical factor may result in diminished radiographic contrast?
a) Underfiltration
b) Increased object-film distance
c) Patient non parallel to the film
d) Patient too think
a) Underfiltration
Increased object-film distance, patient not parallel to the film, and patient too think all may result in diminished radiographic detail or definition.
A higher grid ratio indicates that:
a) Shorter exposure time is required
b) Less primary radiation is absorbed
c) More scatter radiation is absorbed
d) Less scatter radiation is absorbed
c) More scatter radiation is absorbed
The higher the grid ratio, the more scatter and primary radiation is absorbed. Higher grid ratio requires longer exposure time.
Which of the following would appear the whitest on an xray?
a) Bone
b) Organs
c) Barium
d) Fat
c) Barium
Barium, which is a type of contrast media, would appear the whitest on an xray because it will absorb the greatest amount of xrays. Bone absorbs the next highest amount of xrays and would appear white or light gray. Organs absorb some xrays and would appear gray or dark gray. Fat absorbs the least amount of xrays and appears very light gray or translucent on an xray.
Which of the following problems would result in black marks on a developed radiograph?
a) Damaged grid
b) Inadequate rinsing
c) Debris in cassette
d) Low processing solutions
a) Damaged grid
Inadequate rinsing may lead to a yellow radiograph because any remaining fixer will oxidize to a yellow powder. Debris in the cassette may lead to white marks or clear areas on the developed radiograph. Low processing solutions may lead to green areas on the developed radiograph.
Which diagnostic imaging technique forms images based on the release of positrons caused by the administration of a radioactive tracer isotope?
a) CT scan
b) MRI
c) Ultrasound
d) PET scan
d) PET scan
A CT scan works by absorbing photons released from the patient to create a digital image. An MRI creates images using a magnetic field in which radio frequency signals are transmitted and received. An ultrasound uses sound waves to create a digital image.
Which type of ultrasound artifact occurs when sound is completely reflected or absorbed by an object?
a) Refraction
b) Acoustic shadowing
c) Reverberation
d) Mirror image
b) Acoustic shadowing
Refraction occurs when the direction of the sound beam changes while passing between different mediums. Reverberation occurs when sound is constantly reflected between strong reflectors. Mirror image occurs when and organ is lying adjacent to a reflector on the image.
Dorsoventral is a directional term that indicates an xray that enters from the:
a) Back and exits through the abdomen
b) Tail and exits through the head
c) Dorsal aspect of the forelimb and exits at the palmar aspect
d) Dorsal aspect of the hind limb and exits at the plantar aspect
a) Back and exits through the abdomen
A caudocranial xray enters from the tail end of the animal and exits through the head. A dorsopalmar xray enters from the dorsal aspect of the hind limb and exits at the palmar aspect. A dorsoplantar xray enters from the dorsal aspect of the hind limb and exits at the plantar aspect.
Which of the following processing factors may lead to increased film density?
a) Improperly mixed developer solution
b) Incorrect developer temperature
c) Contaminated developer solution
d) Diluted developer solution
b) Incorrect developer temperature
Incorrect developer temperature can lead to increased film density if the temperature is too high. Improperly mixed developer solution, contaminated developer solution, and diluted developer solution can all lead to decreased film density.
Which of the following is described as a loss of detail due to phosphor variations in the intensifying screen?
a) Radiographic mottle
b) Penumbra
c) Quantum mottle
d) Structure mottle
d) Structure mottle
Radiographic mottle is described as loss of detail due to the size of the individual silver halide crystals. Penumbra is described as the loss of detail because of geometric unsharpness. Quantum mottle is described as a loss of radiographic detail common with faster screens because of the unevenly distributed phosphor crystals within the intensifying screen.
