35. Which of the following has a Hounsfield unit value of -90: a. Fat b. bone c.

Question

35. Which of the following has a Hounsfield unit value of -90:

a. Fat

b. bone

c. lung

d. water

36.Ct scanner spatial resolution could improve with an increase of:

a. Focal spot size

b. Detector element size

c. scan time

d. reconstruction matrix

37. multi-slice CT improves the utilization of the:

a. x-ray tube

b. collimators

c. detectors

d. analog to digital converters.

38. the difference in x ray attenuation between white (40 HU) and gray (50 HU) matter is:

a. 0.1 %

b. 1 %

c. 10%

d. 100%

39. Visibility of small high contrast CT lesions would most likely improve with decreasing:

a. Patient dose

b. scan time

c. field of view

d. slice thickness

40. Image noise is not affected by:

a. section thickness

b. patient thickness

c. mAs

d. Display setting

Explanation / Answer

Question: 35. Which of the following has a Hounsfield unit value of -90:

Answer: a. Fat.

Density (HU) of fat is related to the range -50 to -100 HU. For bone it is 700 to 3000 HU. For lung the range is -850 to -910 HU and for water it is 0 HU.

Hence the answer is fat.

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