Free Printable Medical imaging

1.

Which medical imaging techniques use ionising radiation? (Select all)

a)

X-rays

b)

PET scan

c)

CAT scan

d)

ultrasound scan

2.

The intensity of X-rays travelling in a medium decreases exponentially. The parameter μ that governs the rate of decrease is called the (a) coefficient.

3.

An X-rays beam passes through 2 cm of bone and 3 cm of soft-tissue. What is the ratio of transmitted intensity to incident intensity, $\frac{I_{\text{T}}}{I_0}$ ? $\left(\mu_{\text{bone}}=3.0\ \text{cm}^{-1},\ \mu_{\text{muscle}}=0.90\ \text{cm}^{-1}\right)$

a)

$2.5\times10^{-3}$

b)

$1.7\times10^{-4}$

c)

$6.0\times10^3$

d)

$0.067$

4.

Which of the following adjustments can produce a narrower X-rays beam?

a)

increase size of target

b)

use collimator

c)

decrease size of aperture window

d)

use image intensifier

5.

Which of the following terms are not related to CT scan?

a)

voxel

b)

computer

c)

X-rays

d)

radio waves

6.

What of the following are disadvantages of CT scan compared to conventional X-rays scan?

a)

better contrast

b)

more expensive

c)

CT image is 3D

d)

greater dose

7.

Fat has density 925 kg m⁻³. Speed of sound in fat is 1450 m s⁻¹. What is the acoustic impedance of fat?

a)

0.34 × 10⁶ kg m⁻² s⁻¹

b)

1.43 × 10⁶ kg m⁻² s⁻¹

c)

1.34 × 10⁶ kg m⁻² s⁻¹

d)

4.31 × 10⁶ kg m⁻² s⁻¹

8.

A pulse of ultrasound is incident normally on the boundary of muscle and bone. What is the ratio of $\frac{I_r}{I_0}$ where $I_0$ is incident intensity and $I_r$ is reflected intensity?

( $Z_{\text{muscle}}=1.7\times10^6\ \text{kg m}^{-2}\text{ s}^{-1}$ , $Z_{\text{bone}}=6.4\times10^6\ \text{kg m}^{-1}\text{s}^{-2}$ )

a)

0.66

b)

0.34

c)

0.58

d)

0.42

9.

In positron emission tomography, a (a) is injected into the body and aborbed by tissues.

10.

In PET scanning, what is the angle between the two gamma-ray photons produced in an annihilation event?

a)

$0\degree$

b)

$90\degree$

c)

$180\degree$

d)

$360\degree$

Medical imaging

Total questions: 10

Worksheet time: 12mins

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