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Xray Physics > Test 2 > Flashcards

Test 2 Flashcards

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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

A

Acetate

19
Q

Fixer - sequestering agent

A

Boric acid/salts

20
Q

Fixer - solvent

A

Water

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
Q

PACS

A

Picture archiving and communication system

26
Q

T1

A

Low TR and low Te

27
Q

T2

A

High TR and high TE

28
Q

PD

A

High TR and low TE

29
Q

Echo

A

TE and TR are variable but flip angle other than 90

30
Q

STIR

A

Tr and Te are variable, but has inversion value

Xray Physics (2 decks)

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