Imaging in cancer

Question 1

how does MRI work

Answer 1

radio frequency pulse displaces protons and images created display time taken to go back to original position

Question 2

application of MRI-specific contrast agents

Answer 2

intravenous contrast medium which causes changes in local magnetic field. vascular lesions and some tumour screening

Question 3

patient safety issues specific to MRI.

Answer 3

claustrophobic and noisy, motion artefact, cannot image patients with pacemakers or aneurysm clips

Question 4

pros and cons of population screening with radiological testing, using
breast screening as an example.

Answer 4

diagnoses disease at earlier stage so it can be easier to treat and cure, have high sensitivity and specificity, benefit to individual outweighs cost, cons mean radiation exposure but only a bit

Question 5

why should imaging only be requested

when appropriate.

Answer 5

expensive and radiation exposure should be limited ALARA