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Medical Imaging Technology
Transcript of Medical Imaging Technology
Diagnosis Through Medical Imaging
Used to diagnose patients by capturing a "slice" (a single MRI) of the body
Pros: No radiation; no side effects from magnetic field or contrast dye
Cons: implants and pacemakers could be damaged; metal in the body could shift; tight space; 30 to 60 min.
Magnetic Resonance Imaging
*Same as a CT Scan
X-rays create detailed pictures of
of the body
Slices can be stacked to create 3D image
Pro: scan lasts only a few minutes
Cons: emits radiation; allergic reaction to contrast dye (reaction: anaphylaxis)
Computed Axial Tomography
Used to see HOW organs and tissues are working (size, shape, funtion)
Pros: Radiation is gone in 2 to 10 hours ("short lived tracer"); demonstrates change over time
Cons: False results for diabetic patients; radiation
Positron Emission Tomography
equency sound waves to
view internal structures
(emits sound waves and captures return);
machine creates images
Pros: No radiation; no risks, little discomfort
Cons: images are less detailed than other imaging tools (movement sensitive)
Electromagnetic radiation (visible light)
Pros: minimum radiation, little discomfort
Cons: radiation exposure (risky for infants)
How It Works
Dense structures appear white because they block particles
Metal and contrast appears white
Air appears black
Muscle, fat and fluid are grey
When X-ray particles pass through the body . . .
Radioactive material (radio tracers) enters into the body
Special cameras follow the tracer
Pros: details of function (PET)
Cons: time consuming, lower resolution than CT/MRI, exposure to radiation
Small camera attached to end of slender, flexible tube
Type of procedure named after organ area
Sedation to lessen discomfort
Pros: shows live feed of appearance and function; also can be used to remove tumors or stop bleeding
Cons: Risks (bleeding, infection, pain, perforation of tissue)