OK now tell me the expanded form of each of the following
CT = COMPUTERISED TOMOGRAPHY
PET = POSITRON EMISSION TOMOGRAPHY
PETCT = ?
ECT = ?
And here is a very interesting question? If any one on earth can answer it than i will give him/her a MARS BAR.
Q. Define a positron?
If u answer this question properly i will give you full marks

if you cant answer this question properly than i have got a stick handy !!!