Concerning the sensitivity of gamma cameras (system sensitivity): a.

1.	Concerning the sensitivity of gamma cameras (system sensitivity): a. It is a function of both intrinsic and collimator efficiency b. At high keV, the intrinsic sensitivity is almost 100% c. Using a thicker crystal increases sensitivity d. It is measured using a bar test e. It is expressed as total counts per second per mega becquerel of activity (cps MBq-1 )
Answer» a. True. b. False. Below 100 keV, the intrinsic sensitivity is almost 100%, above which it depends on the thickness of the crystal. c. True. Using a thicker crystal improves sensitivity but reduces spatial resolution. d. False. Sensitivity is measured using a known amount of activity in a small source. e. True.

Concerning the sensitivity of gamma cameras (system sensitivity): a. It is a function of both intrinsic and collimator efficiency b. At high keV, the intrinsic sensitivity is almost 100% c. Using a thicker crystal increases sensitivity d. It is measured using a bar test e. It is expressed as total counts per second per mega becquerel of activity (cps MBq-1 )

Answer»

a. True.

b. False. Below 100 keV, the intrinsic sensitivity is almost 100%, above which it depends on the thickness of the crystal.

c. True. Using a thicker crystal improves sensitivity but reduces spatial resolution.

d. False. Sensitivity is measured using a known amount of activity in a small source.

e. True.

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