Examination and diagnosis
3 important questions on Examination and diagnosis
PET-scan
- Principle
- Used for imaging what?
- Resolution ( + or +/- or -)
- Risk (+ or -)
- Radioactive contrast material ('tracer') is infused
- function at a cellular level (blood flow, oxygen use, glucose use)
- -
- + (radiation)
MRI
- Principle
- Used for imaging what?
- Resolution ( + or +/- or -)
- Risk (+ or -)
- Magnets produce strong magnetic field that forces protons in the body (e.g. In water) to align with that field. When a radiowave is then pulsed through the patient, the protons spin out of equilibrium, which is visible on screen. Dense areas show darl. 3D image
- soft tissue (organs)
- .
- -
Ultrasound
- Principle
- Used for imaging what?
- Resolution ( + or +/- or -)
- Risk (+ or -)
- Ultrasound waves (2 to approximately 15 MHz) propagate through different tissues, and then return to the transducer as reflected echoes. Ultrasound waves are reflected at the surfaces between the tissue of different density. 2D image
- organs, blood vessels, fetus
- -
- -
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