Xe ?

Q.All are true regarding Xenon computed tomography  except

a. xenon is freely diffusable and penetrates the blood–brain barrier

b. Xenon computed tomography  can be used to assess cerebral blood perfusion

c. The washout of xenon occurs relatively slowly

d. patient movement during  period of imaging causes misregistration of data

e. patient inhale  of a gas containing 28 per cent xenon

ANS ---c

The washout of xenon occurs relatively rapidly, allowing a repeat examination after 15–20 min.