Test 2 Flashcards

1
Q

What are the 2 types of phosphors

A

Fluorescence and phosphorescence

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2
Q

What is the speed screen for torso and extremities

A

400 and 100

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3
Q

Resolution is affected by

A

Focal spot size
Film emulsion thickness
Phosphor layer thickness
Phosphor size

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4
Q

Gurney-Mott hypothesis

A

Conversion of halide crystals to metallic silver

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5
Q

Frankel defect

A

Allows Ag and Br ions to move

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6
Q

Sensitivity speck

A

Sulfur imperfection in the Ag halide crystal

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7
Q

Developer - reducing agents

A

Hydroquinone and phenidone/metol

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8
Q

Developer - activator

A

Sodium carbonate

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9
Q

Developer - restrainer

A

Potassium bromide, a buffer

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10
Q

Developer - preservative

A

Sodium sulfite

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11
Q

Developer - hardener

A

Gluteraldhyde

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12
Q

Developer - sequestering

A

Chelates

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13
Q

Developer - solvent

A

Water

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14
Q

Fixer - activator

A

Acetic acid

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15
Q

Fixer - fixing agent

A

Ammonium thiosulfate

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16
Q

Fixer - hardener

A

Potassium alum

17
Q

Fixer - preservative

A

Sodium sulfite

18
Q

Fixer - buffer

19
Q

Fixer - sequestering agent

A

Boric acid/salts

20
Q

Fixer - solvent

21
Q

5% rule

A

Increase KVp by 5% and decrease mAs by 30%

22
Q

What increases scatter

A

Decreased KVp
Increased tissue size
Wide field

23
Q

ALARA

A

As low as reasonably achievable

24
Q

DICOM

A

Digital imaging and communication in medicine

25
PACS
Picture archiving and communication system
26
T1
Low TR and low Te
27
T2
High TR and high TE
28
PD
High TR and low TE
29
Echo
TE and TR are variable but flip angle other than 90
30
STIR
Tr and Te are variable, but has inversion value