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Imaging 2 Final

Intro to Digital Radiography Final Review with Math

TermDefinition
Flux Gain Formula the number of light photons at the output screen/the number of light photons at the input screen
Minification Gain (Diameter of the input screen/diameter of the output screen)^2
Brightness Gain Minification Gain * Flux Gain
Calculating Object size Image size=Object size*Magnification Factor
Calculating Size Distortion SID=Magnification Factor * SOD
Pixel Size formula Pixel size=Field of View/matrix
SID Formula SID=SOD+OID
Inverse Square Law I1/I2=D2^2/D1^2
Exposure Maintenance Formula mAs1/mAs2=D1^2/D2^2
Grid conversion formula mAs1/mAs2=GCF1/GCF2
5:1 2
6:1 3
8:1 4
10:1,12:1 5
16:1 6
Without a grid 1
Detective Quantum Efficiency measures the efficiency of the detector to send useful signal to the image signal/noise ratio, by percentage
Modulation Transfer Function Mathematical function that measures the ability of a detector to transfer its spatial resolution characteristics to the image.
Window Level The center of the range of numbers in a digital image BRIGHTNESS
Window Width The range of numbers in a digital image CONTRAST
Bit Discrete units used by computers for processing information
Bit depth number of bits per pixel
Intensifier Flouro Step 1 INPUT SCREEN -coverts x-ray photons to light photons -coated with cesium iodide -Diameter range 13-30 cm
Intensifier Flouro Step 2 PHOTOCATHODE -the light from the input screen strikes the photocathode -made of antimony cesium -emits photoelectrons
Intensifier Flouro Step 3 ELECTROSTATIC LENSES -series of electrodes -accelerate and focus photoelectrons
Intensifier Flouro Step 4 ANODE -small ring of metal with a charge -attracts photolectrons
Intensifier Flouro Step 5 OUTPUT SCREEN -coated with ZnCdS -converts photoelectrons into light -diameter of the output screen is 1/10 the diameter of the input screen
Created by: frenchfrielover