Flashcards in imaging in cancer Deck (11)
How MRI works
radiofrequency pulse causes protons in tissues to align, an image is creates according to the time taken for the protons to realign
indications of MRI
-excellent bone and soft tissue detail.
-brain, spine and musculoskeletal
-abdomen and pelvis
-claustrophobic and noisy
-motion artifact ( patient has to remain still)
-cannot image patients with pacemakers and aneurysm clips,
why use MRI-specific contrast agents
they will make some tumours more easily seen and will also help with seeing vascular lesions
patient safety issues with MRI
-metal cannot be worn as will cause injury
- no radiation risk
what are the clinical applications of imaging?
what imaging can tell us about a tumour
-depth of penetration
-relationship to adjacent structures
-involvement of regional lymph nodes
-presence of distant metastases.
pros of population screening radiological imaging
-increases the number of incidences of the disease being detected.
- increases the chance that the disease is caught at an early, more treatable stage
cons of population radiological imaging
-exposes a large proportion of the population to radiation, possibly increasing cancer incidences.
-requires large numbers of staff
why are radiological imaging techniques only requested when appropriate?
-unnecessary ionising radiation exposure