Why is barium sulphate commonly used to improve X-ray image contrast of soft tissues?
A. a) It is much more dense than soft tissues, and non-toxic in solution.
B. b) It is extremely soluble in water.
C. c) It is highly toxic and very reactive.
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What is the major problem with X-ray imaging of soft tissues?
A. a) Absorption of X-rays by soft tissue is low.
B. b) Different types of soft tissues cannot be differentiated.
C. c) Both a) and b).
In diffusion weighted imaging, restricted diffusion results in:
A. ) lower signal intensity.
B. ) higher signal intensity.
C. ) no change in signal intensity.
In a T2-weighted image, contrast between tissues can be optimised by selecting an appropriate:
A. ) T
B. ) TR.
C. ) TI.
As the number of phase encoded echoes acquired increases:
A. ) the image resolution increases.
B. ) the image resolution decreases.
C. ) the image resolution is unaffected.
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