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← Topic 24 overviewTOPIC 24 ASSESSMENT

Medical physics

CIE-style questions assess ultrasound, acoustic impedance, pulse–echo imaging, X-rays, CT, PET and radiation safety.

Objective question 1

Acoustic impedance is:

Objective question 2

Pulse–echo depth is calculated using:

Objective question 3

Increasing X-ray tube voltage increases the:

Objective question 4

CT constructs slices using:

Objective question 5

PET detects pairs of photons with energy:

Structured question 1

An echo returns after 80 μs in tissue where c = 1540 m s⁻¹. Calculate boundary depth.

Structured question 2

For Z₁ = 1.5 MRayl and Z₂ = 1.7 MRayl, calculate reflected intensity fraction.

Structured question 3

X-ray intensity passes through 8.0 cm where μ = 0.15 cm⁻¹. Calculate I/I₀.