ABR DR Core Practice Questions - ABR Diagnostic Radiology Primary Certification - Core Exam

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In diagnostic CT, which of the following best describes the relationship between kVp and image contrast for soft tissues?

Higher kVp increases soft-tissue contrast because Compton scatter is maximized Lower kVp increases soft-tissue contrast because photoelectric interactions dominate at lower energies kVp has no effect on contrast; only mAs changes contrast Higher kVp decreases patient dose and increases contrast simultaneously

Correct Answer:

Lower kVp increases soft-tissue contrast because photoelectric interactions dominate at lower energies

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