POI P1

34問 • 1年前

通報

問題一覧

process that makes pictures of areas in body

Imaging

specialized branch of medicine that uses image techniques to diagnose, manage, and treat disease in body

Radiology

expression of human creative skill and imagination

Art

study of natural world through observation

Science

art & science of using radiation

Radiography

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)

x-ray beam after it leaves x-ray tube & before it reaches the object

Primary Radiation

radiation resulting after x-ray beam exits the object

Remnant Radiation

radiation prod. from x-ray photon interactions with matter in such a way that the resulting photons go in diff directions

Scatter Radiation

beam of radiation is reduced in energy when passing through tissue

Attenuation

2 Types of Photons that Pass through Matter

Radiolucent Radiopaque

structures that are less dense and permit the x-rays through

Radiolucent

structures that are dense and don’t allow x-rays through them. Appear white on radiograph

Radiopaque

Imaging Chain - _____: invisible image, no details yet - _____: correct term to describe an image produced by photons on an x-ray film

Latent Image Radiograph

exposed directly by x-rays photons

Film Emulsion

every piece of information on radiograph was put there by this

X-ray photons

thin layers of cardboard or polyester coated with layers of luminescent phosphor

Intensifying Screens

radiographic film that has an emulsion on both sides

Double Emulsion

3 Types of Processing

- Manual Processing - Automatic Processing - Digital Processing

processing where the film must be developed, fixed, washed and dried

Manual Processing

processing where film is carried through chemical solution by a series of rollers

Automatic Processing

type of processing where after shot, film will automatically be transferred to a computer for editing

Digital Processing

3 Technical Exposure Factors MKS

1. milliampere (mA) & milliampere seconds (mAs) 2. kilovoltage peak (kVp) 3. Source to Image Distance (SID)

measure of electrical current

milliampere

parameter that controls the amount/quantity of radiation produced by x-ray tube

milliampere seconds

measure of electrical pressure (potential) forcing the current through the tube

kilovoltage peak (kVp)

standardized distance between point of x-ray emission in x-ray tube and image receptor

Source to Image Distance

Source to Image Distance is also known as ______ distance (FFD) or ______ distance (TFD)

>Focal Film Distance >Target To Film Distance

exposure factors under our control

Technique

measure of duration of exposure

Time (Seconds)

FOD MEANING

Film to object distance

4 Factors that can be controlled by radiographer FPQS

>Focal Spot Size >Primary Beam Configuration >Quantity & Quality of Scatter radiation >Speed of image receptor

Photographic Qualities ______ - overall blackening of the film emulsion in response to photons ______ - difference between adjacent densities

- Density - Contrast

7 Variables that can affect density PTMKBFP

Patient Size Tissue Composition mAs kVp Beam modification Film screen combination Processing

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