Radiology 1--Introduction
Terms
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- fluoroscopy, very general desc
- similar to plain radiography, continuous image, often used w/ contrast agent
- nuclear medicine
- use gamma rays to create images, generally functional rather than anatomical info
- angiography
- uses x rays to make image, iodinated contrast dye injected into vessel, images before and after contrast to subtract all except vessels.
- how to make a nuclear medicine image
- 1) chemically attach the radioactive isotope to a chemical (radiopharmaceutical) 2) the agent chosen determines where the isotope goes 3) camera is a detecter which detects incoming gamma rays from body
- Positron emission tomography
- 1) When e+ hits e-, two photons in opposite directinos 2) images use glucose analog 18-FDG 3) PET looks at metabolic rate
- Magnetic Resonance Imaging
- 1) No ionizing radiation 2) uses magnetic fields 3) gadolinium used as contrast 4) like NMR
- Ultrasound
- 1) images w/ sound, 2) tissue interfaces reflect sound) 3) can use micro bubbles for contrast
- Radiology modalities that use ionizing radiation
- Plain films; fluoroscopy; computed tomography; angiography; nuclear medicine; positron emssion tomography
- modalities using x rays
- plain films; fluoroscopy; computed tomography; angiography
- modalities using gama rays
- nuclear medicine; positron emission tomography
- modalities using magnetic properties
- magnetic resonance imaging
- modalities using sound waves
- ultrasound
- common contrast agents
- Flouroscopy: Barium//Angiography:iodinated contrast // CT: Oral (barium) IV (iodinated) // MRI: gadolinium // Nuclear medicine: radiopharmaceuticals // ultrasound: microbubbles (not commmon)