Technicians usually position the patient, choose the exposure and take the image. Getting kVp, mAs and positioning right the first time means a diagnostic study with fewer repeat exposures for the patient and the team.
3 sample Diagnostic Imaging questions
Try each one before opening the answer. These come straight from the VetTech Pro question bank.
Question 1. What does kVp primarily control in a radiographic exposure?
AThe energy and penetrating power of the beam, and so image contrast
BThe number of photons produced, and so the overall density of the image
CThe exposure time, and so the degree of motion blur
DThe focal spot size, and so the geometric sharpness
Show answer and rationale
Answer: A. The energy and penetrating power of the beam, and so image contrast
Higher kVp produces more penetrating photons and a longer scale of contrast with more shades of gray. mAs controls the quantity of photons and therefore overall density.
Question 2. What does anechoic mean when describing an ultrasound finding?
ANo internal echoes, appearing black, as with clear fluid
BStrong echoes, appearing white, as with bone or gas
CMixed echo pattern, as with a complex mass
DCasting an acoustic shadow, as with a calculus
Show answer and rationale
Answer: A. No internal echoes, appearing black, as with clear fluid
A normal urinary bladder or a simple cyst is anechoic. Hyperechoic structures appear bright, hypoechoic appear darker than surrounding tissue, and isoechoic match it.
Question 3. What ultrasonographic finding is characteristic of intestinal intussusception?
AComplete loss of wall layering in a single segment
BUniform gas shadowing obscuring the affected loop
CAnechoic luminal contents in a dilated, static loop
DConcentric rings in transverse section (target sign)
Show answer and rationale
Answer: D. Concentric rings in transverse section (target sign)
One segment telescoped inside another produces the multi-layered target sign in cross section and a sleeve appearance longitudinally. It is one of the more reliable ultrasonographic diagnoses in the abdomen.
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