Test 2 Flashcards
What are the 2 types of phosphors
Fluorescence and phosphorescence
What is the speed screen for torso and extremities
400 and 100
Resolution is affected by
Focal spot size
Film emulsion thickness
Phosphor layer thickness
Phosphor size
Gurney-Mott hypothesis
Conversion of halide crystals to metallic silver
Frankel defect
Allows Ag and Br ions to move
Sensitivity speck
Sulfur imperfection in the Ag halide crystal
Developer - reducing agents
Hydroquinone and phenidone/metol
Developer - activator
Sodium carbonate
Developer - restrainer
Potassium bromide, a buffer
Developer - preservative
Sodium sulfite
Developer - hardener
Gluteraldhyde
Developer - sequestering
Chelates
Developer - solvent
Water
Fixer - activator
Acetic acid
Fixer - fixing agent
Ammonium thiosulfate
Fixer - hardener
Potassium alum
Fixer - preservative
Sodium sulfite
Fixer - buffer
Acetate
Fixer - sequestering agent
Boric acid/salts
Fixer - solvent
Water
5% rule
Increase KVp by 5% and decrease mAs by 30%
What increases scatter
Decreased KVp
Increased tissue size
Wide field
ALARA
As low as reasonably achievable
DICOM
Digital imaging and communication in medicine
PACS
Picture archiving and communication system
T1
Low TR and low Te
T2
High TR and high TE
PD
High TR and low TE
Echo
TE and TR are variable but flip angle other than 90
STIR
Tr and Te are variable, but has inversion value
