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RT IT RT296

RT film it class

QuestionAnswer
Film screen images are: hard copy and analog
Digital images are: soft copy and digital
Roentgen's are equal to: air kerma
Rad's are equal to: grays
Rem's are equal to: seiverts
Rad's are what kind of dose? Patient dose
Rem's are what kind of dose? Occupational dose
What are the image characteristics of film? Density, Contrast, Recorded detail, and Distortion
What is SNR? signal to noise ratio
What is density? amount of blackness
What is the primary controlling factor of density? mAs
What are the 2 controlling factors of density? mAs and kV
How much of a % change does it take for kV to make a difference? 4% change
What is the same as a 15% change in kV? doubling or halving the mAs
What is contrast? variation in density
What is the controlling factor for contrast? kV
High contrast has what type of scale? short scale
Low contrast has what type of scale? long scale
What are the 2 types of motion and an example of each? Voluntary (breathing) and involuntary (peristalsis)
What helps the image quality? 1.short exposure time 2.film screen speed
What are the geometric factors? 1.small focal spot 2.SID 3.OID
The radiographic film image is composed of what on a polyester base? metallic silver
Which specific exposure factor controls the quality or penetrating ability of the xray beam? kV
Exposure time is usually expressed in units of? milliseconds
The recorded sharpness of structures or objects on the radiograph defines what? resolution
The lack of visible sharpness is called? blur or unsharpness
The term that describes the unsharp edges of the projected image is? penumbra
The greatest contributor to image unsharpness as related to positioning is? motion
The misrepresentation of an object size or shape projected onto a radiographic recording medium is called? distortion
Created by: Chrslarsen