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X-Ray Tech > Test 4 Unit 5 > Flashcards

Test 4 Unit 5 Flashcards

1
Q

Basic rules of film processing

A

standardize procedures

keep clean and well maintained

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2
Q

location

A

adjacent to exposure room

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3
Q

radiation protection

A

ensure no exposure to the darkroom

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4
Q

size

A

6’x8’

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5
Q

environment

A

tight light

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6
Q

work area

A

dry and wet areas. Formica tabletop.

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7
Q

plumbing

A

hot and cold for mixing chemicals and cleaning processor. hardness of water can affect film

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8
Q

electrical

A

110V to operate

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9
Q

ventilation

A

should ventilate chemical vapors/odors

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10
Q

film storage

A

clean, dry, low humidity. 50-70 degrees. Stand on edge, not stacked or flat

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11
Q

commercial film bin

A

many have a security systems that prohibits bin from being opened with light on

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12
Q

passbox

A

metal lined box installed in the darkroom wall to safely pass exposed and unexposed cassettes

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13
Q

Chemical protection

A

rubber gloves, aprons, eye wash, MSDS sheets

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14
Q

Exam room Walls

A

primary 1/16” lead, 7 ft tall

secondary 1/32” to the ceiling

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15
Q

dark room entrances

A

maze, rotatrek, double door, single door

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16
Q

Patient ID marking system

A

patient ID info is flashed onto film after it has been exposed and before processing

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17
Q

wall color

A

light colors reflect light which help keep safelight intensity to a minimum

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18
Q

types of light needed

A

overhead - higher than usual

safelight - lower at regular level

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19
Q

safelight

A

red. GBX-2 filter is common for both blue and green sensitive film

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20
Q

exposed film is _____ x more sensitive to light of all wavelengths

A

10

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21
Q

Post Exposure Fog (PEF)

A

results from exposure to the film after initial X-ray exposure but before processing

22
Q

Ways to reduce PEF

A

safelight wattage below 15W (preferred 7.5W)
4’ distance to work area, indirect lighting
use a single safelight
eliminate white leaks

23
Q

Kodak Safelight Test

A

designed to determine the safe handling time of unexposed and exposed film under safelighting conditions. Prexpose half of 8x10.

24
Q

Processing time is determined by…

A

developer temperature and concentration

25
Q

an increase in temperature =

A

shorter developing time

26
Q

a decrease in concentration=

A

shorter developing time

27
Q

automatic processing

A

mechanized, faster, less variable, more initial expense

28
Q

manual processing

A

hand tanks, time consuming, variable, lower start up costs

29
Q

Autoprocessor components

A 
roller transport system
temperature control system
chemical system
replenishment system
circulation/filtration system
drying system
electrical system
30
Q

The processing cycle

A

Develop
Fix
Wash
Dry

31
Q

transport system

A

1”&3” rollers that move film in and out of tanks.

32
Q

entrance roller

A

grabs film

33
Q

deep racks

A

move film through solutions

34
Q

turnaround rollers and guide shoes

A

push film upward

35
Q

crossover

A

moves film to next tank

36
Q

squeegee

A

removes excess liquid before drying

37
Q

Developer

A

turns latent image into manifest image. film density and contrast established here, odorless and clear with a light amber appearance. temp should be monitored on daily start up

38
Q

primary wall

A

directly behind bucky

39
Q

secondary wall

A

to the right or left of bucky

40
Q

hydroquinone

A

reducing agent. slow acting agent responsible for dark tones on film. Time and temperature sensative

41
Q

phenidone

A

reducing agent. fast acting agent responsible for gray tones on film. works on lighter areas of exposure. time and temperature sensitive

42
Q

Glutaraldehyde

A

hardener. keeps emulsions from over-swelling

43
Q

reducing agents

A

in developer. responsible for building film density and contrast

44
Q

Fixer

A
  1. stops developing process
  2. removes undeveloped silver from the film
  3. shrinks and hardens the emulsion
45
Q

acetic acid

A

acidifier. stops the developing process on contact

46
Q

aluminum chloride

A

hardener. shrinks and hardens emulsion

47
Q

dryer

A

infrared dryer operating at 120F. dries film in under minute

48
Q

temperature control system

A

developer heater core and a thermal sensor in the developer tank, and a modular control unit.

49
Q

a ____ % swing in temp is enough to double or cut film density in half

A

3

50
Q

how long to table top processors take to stabilize developer temperatures?

A

15-20 minues

51
Q

Never insert a _______ thermometer into the processor

A

mercury

52
Q

recirculation

A

agitates developer solution. stabilizes temperature. should be between 90-95F. filters sediment

X-Ray Tech (4 decks)

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