Imaging Equipment and QC Questions and Answers Flashcards
6 cards from real CAMRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Imaging Equipment and QC Questions and Answers flashcards as text
Annual QC testing shows the X-ray tube HVL is below acceptable minimum. What does this indicate?
Answer: Insufficient beam filtration increasing patient skin dose
Low HVL indicates inadequate filtration, allowing too many low-energy photons that increase skin dose.
What is the purpose of collimator light-to-radiation field alignment testing?
Answer: Ensure the light field accurately represents the irradiated area
Alignment testing verifies the collimator light accurately indicates X-ray field boundaries.
A fluoroscopy unit ABC is increasing kVp beyond limits. What is the likely cause?
Answer: Degraded image intensifier input phosphor
II input phosphor degradation reduces conversion efficiency, causing ABC to compensate by increasing technique.
How should the anode heel effect be utilized in clinical practice?
Answer: Higher intensity on cathode side; position thicker body parts toward cathode
Greater intensity on the cathode side due to self-absorption in the anode. Thicker parts go toward the cathode.
CT QC shows water measures consistently +8 HU instead of 0. What is the significance?
Answer: Calibration drift affecting diagnostic accuracy; recalibration needed
Water accuracy should be 0 plus or minus 4 HU. +8 HU indicates systematic drift.
What is the purpose of the wire mesh test in mammography QC?
Answer: Evaluate screen-film contact or detector uniformity
The mesh test identifies areas of non-uniform image quality.