Question: ( a ) ( 5 points ) What is the difference between X - rays and gamma - rays. ( b ) ( 5 points

(a)(5 points) What is the difference between X-rays and gamma-rays.
(b)(5 points) List two advantages of SPECT/CT over SPECT alone.
(c)(5 points) Explain why collimators are not needed for PET.
( a ) ( 5 points ) What is the difference between

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