David Sang and Graham Jones Solutions for Chapter: Medical Imaging, Exercise 11: EXAM-STYLE QUESTIONS

Which of the following scans use ionising radiation?

(b) It is suggested that a scanner could be designed using the annihilation of a proton and an antiproton. Calculate:

(i) the energy released in the proton-antiproton annihilation.

(b) It is suggested that a scanner could be designed using the annihilation of a proton and an antiproton.

(ii) Calculate the wavelength of the $\gamma$-ray photons produced in the annihilation.

(c) In one type of PET scanner, the tracer isotope is $\mathrm{Rb}-82$. Write an equation for the decay of this isotope. (Mass of proton $=1.67\times {10}^{-27} \mathrm{kg}$.)

(a) (i) With reference to PET scanning, explain the meaning of the term tracer.

Explain what is meant by the term line of response and how it is used to identify the precise site of cancerous tissue.

(b) (i) With reference to PET scanning, explain what is meant by an annihilation event?

(b) (ii) Name the important quantities which are conserved in an annihilation event.