Radiographic Terms Flashcards

0
Q

AUTOMATIC COLLIMATION

A

(PBL)- positive beam limitation

  • constricts beam
  • when using cassette, sensors sense size of cassette and collocates down
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1
Q

ANODE

A

“Target”

  • positive electrode
  • receives electrons
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2
Q

BLUR

A

“Image blur” “penumbra”

  • unsharpness
  • checking trabecular pattern
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3
Q

BUCKY

A

Device that holds cassette in table

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4
Q

CASSETTE

A

Film screen- silver bromide crystals->black metallic silver
-rare earth phosphors light up
CR- imaging plate
-barium fluoro halide

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5
Q

CATHODE

A

“Filament”
Negative electrode
-lights up to incandescence
-forms space charge called “cloud of electrons”

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6
Q

CONTRAST

A

Differences in density
Short scale (high contrast)-whites/blacks , no grays.
Long scale (low contrast)-
More grays, whites/blacks

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7
Q

DENSITY

A

Overall blackening of image

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8
Q

DISTORTION

A

Misrepresentation of image

-size or shape

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9
Q

IMAGE RECEPTOR

A

Anything that receives image

  • image intensifier
  • film screen cassette
  • I.p.- imaging plate
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10
Q

FOCAL SPOT

A

Where electrons hit anode
-small focal spot- sharper image
Steeper angle= smaller degree= focal spot

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11
Q

GRID

A

Absorbs scatter

  • image quality device
  • not a radiation protection device
  • need more radiation because has to go through lead plate
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12
Q

INTENSIFYING SCREEN

A

Light up during exposure

  • rare earth phosphors
  • 95% light 5% X-ray
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13
Q

KVP

A

Quality

-beam penetration controls contrast

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14
Q

LEAD APRONS

A

Secondary barrier

-used during fluoro

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15
Q

MAS

A

Quantity

  • # of photons
  • controls density
16
Q

OID

A

“OFD”
Object-image distance
-low oid= increased sharpness

17
Q

AUTOMATIC PROCESSOR

A

4 tanks-

  • developer-changes latent image to manifest
  • fixer-hardens emulsion, gets rid of unexposed silver bromide crystals
  • wash- washes off excess chemicals
  • dry
18
Q

LASER PRINTER

A

Makes Hard copies of xrays from digital

19
Q

RADIOGRAPH

A
X-ray image after exposed and processed
- legal record used in court cases
Ensure: 
1. Image quality 
2. Verify identity 
3. Left/right markers are correct
20
Q

RADIOGRAPHIC POSITION

A

Specific position of body or part in relation to table or image receptor

21
Q

RADIOGRAPHIC VIEW

A

Image

-how body part is seen on on X-ray view

22
Q

RECORDED DETAIL

A

Sharpness- definition/resolution

-how clear the boundary of image is.

23
Q

SID

A

(FFD) -source image distance

-anode to image receptor

24
Q

SOD

A

FOD

  • source to object distance
  • between anode to patient
25
Q

CR

A

-computed radiography
-using cassette with imaging plate-barium fluoro halide phosphors.
Put in image reader, laser scans image.

26
Q

CRT

A

Cathode Ray tube-

Monitor that brings up image

27
Q

DICOM

A

Digital Imaging Communicating Medicine

-Software used for blending modalities

28
Q

DR

A

Digital radiography
-uses detectors
-selenium/silicon
Silicon uses scintillator

29
Q

HIS

A

Hospital info system

30
Q

HISTOGRAM

A

Graphic display of distribution of pixels

31
Q

PACS

A

Picture archiving communication system

- network to transfer images

32
Q

PIXEL

A

Boxes of data

-smallest component of matrix

33
Q

REMNANT BEAM

A

(Exit radiation)-leftover radiation

  • X-ray beam that exits patient
  • made up of image forming rays that hit I.R. (Image reader)
34
Q

RIS

A

Radiology info system

-use for EDE

35
Q

VOXEL

A

3-dimensional pixel
-volume element
-used in CT/MRI/3d ultrasound
-

36
Q

WINDOW LEVEL

A
Adjusting density (post parameters)
-after image is in comp
37
Q

WINDOW WIDTH

A

Adjusting contrast-after image is on comp

38
Q

MAGNIFICATION

A

SID-FFD
OID-OFD
SOD-FOD
-more KV =less magnification