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26 Cards in this Set
- Front
- Back
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How does the study of imaging help evaluation and treatment of patients? |
Clinicians interpret the image and correlate clinical finds with imaging information and decide if further imagine or testing is necessary |
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Evolution of Diagnostic Imaging |
Dr. Rontgen produced and detected electromagnetic radiation in wave lengths (xrays) on Nov. 8, 1895 20th Century "Bone Portraits" |
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Ionized |
XRays and Gamma rays (Smaller and Faster) |
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Radiology |
Medical specialty that uses imaging to both diagnose and treat disease visualized with human body |
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Advantages vs Disadvantages |
Quick Easy portable inexpensive Ionizing radiation, poor at visualizing soft tissue and small fractures |
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Cycle |
Eval --> Referral --> Requisition --> Imaging --> Report --> Diagnosis --> Treatment --> Patient Outcome |
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Radiograph |
Recorded image of an anatomic part acquired by the passage of Xrays through the body |
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X Ray Production Requires |
Source of Electrons Force to move them Something to Stop them Cathode has a heaated element that creates electrons when the kV is applied Electrons hit the anode and decelerate and create the image due to energy conversion |
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Creation of Radiographic Image |
XRays pass thru patient, remnant beam has an aerial image, beam hits film |
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Soft vs Hard Ray |
Closer to UV Wavelength Closer to Gamma Wavelength |
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Film/Screen |
Combination of film and crystal coasted intensifying screens = inside cassette
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Cassete |
light proof, plastic cases that hold the film between layers |
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Fluroscopy |
Method of capturing Xrays that involves high doses of radiation.
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Radio Density |
Determined by the amount of Xrays a structure will absorb. Thicker structures will absorb more |
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Air Radiodensity Color |
Black |
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Fat Radiodensity Color |
Dark Grey |
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Water Radiodensity Color |
Light Grey |
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Bone Radiodensity Color |
White |
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Radiolucent |
Anything that lets Xrays through |
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Radiopaque |
Anything that blocks Xrays |
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Exposure |
Over = too dark under = too light |
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Recorded Detail |
sharpness, resolution, def of shape, motion distance from tube and beam size can effect detail
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Distortion |
Difference between the patient/object and recorded image |
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Collimator |
A device for limiting the size and shape of radiation beam Reduces scatter and reducing patient dose and increases radiographic quality |
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Projection |
Path Xray takes as it travels from the tube through the patient to the bucky |
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Maximizing Consitancy |
Orientation, Xray tube, position of the film, and standard distancces |
