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RT 201 > 1ST QUIZ > Flashcards

1ST QUIZ Flashcards

1
Q

exactness of representation of the patient’s anatomic structures on the radiograph within the useful density range

A

Radiographic Quality

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2
Q

radiograph that exactly reproduces the anatomic part.

-needed by radiologist to be able to make accurate diagnosis

A

HIGH QUALITY RADIOGRAPHS

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3
Q

contain information that is difficult for human eye to interpret, which can lead to repeated X-rays or missed diagnosis

A

POOR QUALITY RADIOGRAPHS

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4
Q

THREE MAJOR INTERRELATED CATEGORIES OF RADIOGRAPHIC QUALITY

A

Film factors
geometric factors
subject factors

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5
Q

THREE IMPORTANT CHARACTERISTICS OF RADIOGRAPHIC QUALITY

A

HIGH RESOLUTION

• LOW NOISE

• PROPER SPEED

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6
Q

is the ability to visually detect separate objects on a radiograph

A

resolution

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7
Q

2 TYPES OF RESOLUTION

A

spatial resolution
contrast resolution

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8
Q

refers to the bone versus soft tissue interface

A

spatial resolution

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9
Q

spatial resolution is measured in

A

LINE PAIRS PER MILLIMETER (1P/mm)

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10
Q

are terms commonly used when referring to spatial resolution

A

Details or visibility of detail

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11
Q

degree of sharpness of on a radiograph

A

Detail

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12
Q

allows the viewer to see detail because image and optical density are adequate.

A

visibility of detail

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13
Q

contrast differences between similar tissues such as liver and spleen.

A

contrast resolution

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14
Q

THREE COMPONENTS OF RADIOGRAPHIC NOISE

A

FILM GRAINiNESS
STRUCTURE MOTTLE
QUANTUM MOTTLE

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15
Q

distribution and size the silver-halide of crystals in the emulsion of the film.

A

Film graininess

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16
Q

similar to pilm graininess but refers to the phosphor of the radiographic screen rather than silver-halide crystals.

-is equally inherent and it contributes to little radiographer noise.

A

structure mottle

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17
Q

Principal cause of the radiographic noise. -refers to the randomness with which a low. number of x-ray photons interact with the. intensifying screens.

A

quantum mottle

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18
Q

ability of an x-ray film to respond to an X-ray exposure.

A

speed or sensitivity

19
Q

they are affected by image receptor speed.

A

RESOLUTION and NOISE

20
Q

Proper speed on the film-screen combination, limits patient dose but produces ____

A

high resolution, low noise radiograph.

21
Q

FAST IMAGE RECEPTORS

A

• (400, 600, and above)

•HIGH noise and Low resolution

22
Q

SLOW IMAGE RECEPTORS

A

(50,100, 200, and 300)

•Low noise and HIGH resolution

23
Q

performed when a STEP-WEDGE image is flashed onto an x-ray film to simulate an exposure

A

sensitometry

24
Q

performed when a STEP-WEDGE image is flashed onto an x-ray film to simulate an exposure- if not available, ______ maybe imaged.

A

ALUMINUM STEP-WEDGE

25
Q

image shows the shades of gray, which demonstrate radiographic contrast or variations in optical density

A

step wedge

26
Q

measures the light transmitted through the step-wedge increments

A

densitometer

27
Q

used in processing ac in imaging departments -used by film manufacturing to determine the characteristics of x-ray film.

A

sensitometry and densitometry

28
Q

•Testing sensitometry and Densitometry are similar, but the optical density (OD) numbers for film characteristics are plotted on _____

A

SEMI-LOGARITHMIC GRAPH.

29
Q

when OD is plotted in semi-logarithmic graph paper, the result is a

A

characteristic curve

30
Q

parts of characteristic curve

A

Toe and shoulder

31
Q

It is relationship between optical density and radiationbexposure plotted on a graph.

A

Hand D CURVE (HUSTER AND DRIFFIELD CURVE)

32
Q

slope of straight line portion

A

film contrast

33
Q

determine on the log op Relative exposure scale. Fast speed film film to the right the lept and low speed

A

speed

34
Q

range of exposure in the diagnostically useful range of the charactensfic curve.

A

latitude

35
Q

•HIGH EXPOSURE LEVEL

A

Shoulder

36
Q

Low exposure level

A

Toe

37
Q

Intermediate exposure levels

-Region in which the optical density number from a properly exposed radiograph appear. When a characteristic curve is plotted from. densitometry numbers, CONTRAST, GRADIENT, and SPEED can be easily determined.

A

Straight line portion

38
Q

what are the characteristics that can be seen when characteristic curve is plotted from. densitometry numbers,

A

CONTRAST, GRADIENT, and SPEED

39
Q

are devices that measures optical density used to perform sensitometry and densito- metry.

A

Aluminum step wedge or Penetrometer & Densitometer

40
Q

a device that has a light source focused

through a pinhole

A

DENSiTOMETER

41
Q

-numerical value calculated between the level. of light incident on a processed step wedge image (lo) and level. mitted through that film. light trans-
it is a logarithmic function

A

optical density

42
Q

what are the characteristics that curve shows

A

film contrast
speed
latitude

43
Q

radiographic application

A

Fast image receptors
slow image receptors

RT 201 (1 decks)

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