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Principles of disease (Ross Lilley) > imaging in cancer > Flashcards

Flashcards in imaging in cancer Deck (11)
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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
cardiac imaging


MRI contrindications

-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


general guidelines for the judicious use of imaging

-dose as low as reasonably achievable
-only when examination is necessary
-adequate clinical information is essential for appropriate protocol
-repeat examination avoided