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DIAGNOSTIC IMAGING EXAM
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DIAGNOSTIC IMAGING EXAM 2024-2025What exactly does the following paragraph mean?
"Radiographs with a long contrast scale have a few black and white hues and many
gray tones. A short contrast scale consists of black and white tones, with a few
grays in between. Most research benefit from a large contrast scale." - ANSWER
Radiographic Contrast.
What four elements influence the appropriate scale of radiography contrast? -
ANSWER: Subject density, kVp level, film contrast, film fogging.
What exactly does the following paragraph mean?
"Denser tissues, such as bone, absorb greater amounts of x-rays and appear white
on a radiograph, whereas less dense tissues, such as lung tissue, absorb lesser
amounts of x-rays and appear black on the finished radiograph." - ANSWER On
radiographs, air or lung tissue appears radiolucent, or black, because it enables
more radiation to flow through. As density increases, the tissue becomes whiter, or
more radiopaque, since it absorbs more radiation. Bone absorbs more X-rays than
muscle, therefore it looks whiter (radiopaque) on the final radiograph, whereas air
in the thorax appears radiolucent. The thickness of the area influences the number
of X-rays absorbed.
As kVp grows or lowers (circle one), the contrast scale lengthens, and exposure
latitude increases or decreases (circle one), making minor technique errors more
forgiving. - ANSWER grows; more
The National Council on Radiation Protection and Measurements recommends that
occupationally exposed persons receive no more than ___________ per year. The
MPD for nonoccupational people is ___________ percent of the dosage for
occupationally exposed people, or ___________ per year. This is referred to as the
_________. Furthermore, a fetus should not receive more than ___________
throughout the gestation period. - Answer: 5 REM; 10%; 0.5 REM; ALARA MP;
D0.5 REM.
, What preparations are necessary to acquire best ultrasonic imaging results? -
ANSWER Shave or trim the animal's fur. Clean the area with alcohol to remove
stray hairs, debris, and skin oils. Use an acoustic coupling gel. Keep the animal
calm during the operation while the ultrasound probe is positioned over the body
portion being assessed.
Is it necessary for the patient to fast before undergoing an abdominal ultrasound? -
The answer is yes.
What fasting procedures are required to prepare for an endoscopy? - ANSWER:
12-24 hours.
What is the optimum order for the following standard procedures involved in
endoscope care? Always treat things gently and carefully.
Possible reasons for film fogging: The film was exposed to significant scatter
radiation. The film was exposed to radiation during storage. The film was stored in
a hot or humid environment. The film was exposed to a cracked safelight filter that
was improper for the type of film utilized.
The film expired after being subjected to a low-grade light leak in the darkroom.
How can you reduce radiation exposure while placing patients? - ANSWER You
can utilize non-manual restraint aids, such as chemical restraint, and then position
them using sandbags, tape, and other equipment to go further away from the beam
or out of the room during radiation exposure.
What form of personal protective equipment (PPE) should you wear when
receiving x-rays and being exposed to radiation? - ANSWER Lead-lined gloves or
mitts, glasses or goggles, apron or gown, and thyroid shield.
What is the dosimetry badge? - ANSWER It's a badge that measures how much
radiation you're exposed to.
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