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Flashcards in W1 Deck (8)
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1

List the steps in interpretation of medical imaging

1.Interpretation

2

emphasizing the type of image and the orientation, limitations

1. X-ray techniques-- X-ray attenuation to produce images (absorb & scatter x-ray beam different degrees). Produce shadows=image; ionizing radiation.
-plain radiography--planar images, bone/chest, ionization

-mammography- breast tissue, high spatial resolution, ionization

-fluoroscopy-"live action" x-ray; visualize dynamic process i.e.. swallowing, can take spot images, video, rapid-sequence images; ionization

-angiography-fluroscopy, vessels inject contrast, DSA (digital subtraction angiography) subtracts bones and structures from images; ionization

-DEXA- (Dual-energy x-ray absorptiometry); quantitative determine bone mineral density=osteoporosis; ionization

-CT-computed tomography, CAT scan uses x-rays & computations to produce cross sect images throughout body; ionization

2. Ultrasound-
-doppler--emits high-frquency sound & detects echoes from tissues; image by magnitude & delay echoes, sonar. NO ionization
-fluid= dark, organ=gray, fat+air=bright
-fetal, echocardiography, abd, pelvic, prostate, vascular
-flow velocity in vessels, doppler shift by moving RBCs, waveform and color doppler images

3. MRI-magnetic resonance imaging; manipulate H+ in magnetic field produces cross sect images; NO ionization
-many applications= musculoskeletal, CNS

4. Nuclear Medicine- radioactive agent in body, emits gamma ray imaged by gamma camera; planar, SPECT, SPECT?CT; ionization
-show physiologic processes
-ventilation/perfusion lungs, tagged WBC scan, octreoscan (find carinoid & tumors), bone scan

-PET/CT-positron emission tomography.
-images positron decay--higher resolution, usually combine with CT
-common agent=FDG; F-18 fluorodeoxyglucose
-goes to areas of high metabolism
-oncology, neurologic, cardiac applications
-ionization

3

Describe the four basic densities that are visible on plain films

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4

Describe how x-rays are produced and the role they play in image production in plain film radiography.

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5

Define the terminology used to describe images: upright, supine, PA, AP

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6

Explain how position of the patient can affect magnification, organ position, blood flow, and affect image interpretation

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7

Discuss how the use of contrast agents can permit visualization of anatomic structures that are not normally seen

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8

Describe how contrast agents can be administered

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