問題一覧
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process that makes pictures of areas in body
Imaging
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specialized branch of medicine that uses image techniques to diagnose, manage, and treat disease in body
Radiology
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expression of human creative skill and imagination
Art
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study of natural world through observation
Science
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art & science of using radiation
Radiography
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IMAGE PRODUCTION 4 REQUIREMENTS VSMM
1. Vacuum (Tube Housing) 2. Source of Electron (Filament) 3. Method to accelerate electrons (Voltage) 4. Method to stop electron (Target)
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x-ray beam after it leaves x-ray tube & before it reaches the object
Primary Radiation
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radiation resulting after x-ray beam exits the object
Remnant Radiation
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radiation prod. from x-ray photon interactions with matter in such a way that the resulting photons go in diff directions
Scatter Radiation
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beam of radiation is reduced in energy when passing through tissue
Attenuation
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2 Types of Photons that Pass through Matter
Radiolucent Radiopaque
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structures that are less dense and permit the x-rays through
Radiolucent
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structures that are dense and don’t allow x-rays through them. Appear white on radiograph
Radiopaque
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Imaging Chain - _____: invisible image, no details yet - _____: correct term to describe an image produced by photons on an x-ray film
Latent Image Radiograph
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exposed directly by x-rays photons
Film Emulsion
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every piece of information on radiograph was put there by this
X-ray photons
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thin layers of cardboard or polyester coated with layers of luminescent phosphor
Intensifying Screens
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radiographic film that has an emulsion on both sides
Double Emulsion
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3 Types of Processing
- Manual Processing - Automatic Processing - Digital Processing
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processing where the film must be developed, fixed, washed and dried
Manual Processing
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processing where film is carried through chemical solution by a series of rollers
Automatic Processing
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type of processing where after shot, film will automatically be transferred to a computer for editing
Digital Processing
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3 Technical Exposure Factors MKS
1. milliampere (mA) & milliampere seconds (mAs) 2. kilovoltage peak (kVp) 3. Source to Image Distance (SID)
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measure of electrical current
milliampere
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parameter that controls the amount/quantity of radiation produced by x-ray tube
milliampere seconds
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measure of electrical pressure (potential) forcing the current through the tube
kilovoltage peak (kVp)
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standardized distance between point of x-ray emission in x-ray tube and image receptor
Source to Image Distance
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Source to Image Distance is also known as ______ distance (FFD) or ______ distance (TFD)
>Focal Film Distance >Target To Film Distance
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exposure factors under our control
Technique
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measure of duration of exposure
Time (Seconds)
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FOD MEANING
Film to object distance
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4 Factors that can be controlled by radiographer FPQS
>Focal Spot Size >Primary Beam Configuration >Quantity & Quality of Scatter radiation >Speed of image receptor
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Photographic Qualities ______ - overall blackening of the film emulsion in response to photons ______ - difference between adjacent densities
- Density - Contrast
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7 Variables that can affect density PTMKBFP
Patient Size Tissue Composition mAs kVp Beam modification Film screen combination Processing