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Intro to RT Terminology > Nomenclature > Flashcards

Nomenclature Flashcards

1
Q

ADC

A

Analog to digital converter - converts images to numerical data

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2
Q

Automatic collimation

A

Ability of radiographic equipment to collimate the X-Ray beam to the same size as the image receptor resting in the Bucky tray

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3
Q

Blur

A

Effect of motion on a radiographic image

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4
Q

Bucky (Potter Bucky diaphragm)

A

Moving grid which removes scatter radiation from remnant beam

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5
Q

Cassette

A

Light proof container holding the image receptor

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6
Q

Collimator

A

Boxlike structure containing shutters to limit X-Ray beam to certain areas of the body

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7
Q

Computed Radiography (CR)

A

Digital radiographic imaging using a cassette containing an image plate

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8
Q

Contrast

A

Differences in densities on an image, allows detail to be seen

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9
Q

CRT

A

Cathode ray tube

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10
Q

Density

A

Opaqueness or degree of blackening on an area of the processed image

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11
Q

DICOM

A

Digital imaging and communications in medicine - blending a picture archiving and communications system and various imaging modalities

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12
Q

Direct digital radiography (DR)

A

Uses fixed detectors that directly communicates with a computer

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13
Q

Distortion

A

Misrepresentation of the size or shape of an object as recorded on the radiographic image

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14
Q

Exposure indicator

A

S-number or exposure index that describes the status of the exposure and diagnostic cake of the digital image

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15
Q

Film

A

Film before exposure to radiation

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16
Q

Focal spot (focal track)

A

Area from the anode in an X-Ray tube which from which X-Rays emanate

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17
Q

Grid

A

Device placed between the image receptor and the patient that absorbs scatter radiation exiting the body

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18
Q

HIS

A

Hospital information system

19
Q

Histogram

A

Graphic display of the distribution of pixel values

20
Q

Image receptor

A

Any device or medium that captures the remnant beam

21
Q

Imaging plate (IP)

A

Device that absorbs the photon energies exiting the patient

22
Q

Intensifying screens

A

Screen that glows when hit with radiation and exposes the film contained in the cassette

23
Q

kVp

A

Peak kilovoltage applied to the X-Ray table determining the wavelength of the X-Ray beam, it’s ability to penetrate the body, and the overall contrast of the radiographic
Image

24
Q

Lead apron

A

Lead covering worn by radiographers which absorbs the scatter radiation

25
Q

mAs

A

Milliampere seconds, current that is passed through the X-Ray tube which is then converted to X-Rays when it strikes the anode. It determines the number of X-Rays produced and the overall darkness of the resulting image

26
Q

Matrix

A

Digital image made up of rows and columns of data

27
Q

Object-to-image receptor distance (OID)

A

Distance from part being examined to part detecting the radiation

28
Q

PACS

A

Picture archiving and communications system

29
Q

Pixel

A

Picture element, smallest component of a matrix

30
Q

Postprocessing image enhancement

A

Digital manipulation of a radiographic image after its acquisition by a computer

31
Q

Processor

A

Machine that develops X-Ray film

32
Q

Radiograph

A

X-Ray image after it has been exposed and processed

33
Q

Radiographic position

A

Body position in relation to the table and the image receptor

34
Q

Radiographic projection

A

Path that the beam takes as it passes through the body

35
Q

Radiographic view

A

How the image receptor sees the body image

36
Q

Recorded detail

A

Sharpness of structural lines as recorded on the radiograph

37
Q

Remnant beam (exit radiation)

A

X-Ray beam that exits the patient

38
Q

RIS

A

Radiology information system

39
Q

Source-to-image receptor distance (SID)

A

Distance from source of radiation to the device detecting the radiation

40
Q

Source-to-object distance (SID)

A

Distance from the source of radiation to the part being examined

41
Q

Voxel

A

Volume element, section of tissue represented by the pixel

42
Q

Window level

A

Midpoint of densities in a digital image, used to adjust digital image brightness

43
Q

Window width

A

Adjusts contrast of the digital image

Intro to RT Terminology (7 decks)

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