Digital Film Receptors Flashcards
Used for computed radiography
Imaging plate
Allows implementation of a fully PACS
Digital detectors
Imaging plate is made from
Photostimulable phosphor plate
Phosphor layer
Barium fluorochloride
Protects the phosphor layer and allows light feom the laser and emitted light to pass through it
Protective layer
A layer of PSP that traps the electrons during exposure
Phosphor layer
Stimulates light
Photostimulable
Most commonly used phosphor
Barium Fluorobromide
Sends light in a forward direction
Reflective layer
Absorbs and reduces static electricity, not found in IS, absorbs excess electricity
Conductive layer
Gives imaging sheet some strength
Support layer
Absorbs stimulating light (laser light) but reflects emitted light
Light Shielding Layer
Protects the back of the plate
Backing layer
Identification of the patient
Barcode
Serve to orient the cassette to the top of the patient and patient’s right side
Stickers
2 types of IP
Standard Resolution
High Resolution
Resolution that have thick phosphor layer
Standard Resolution IP
Resolution that have thinner phosphor layer, commonly used for extremity examination
High Resolution IP
CR cassette are usually made of
Aluminum / Aluminum honeycomb panel
Allow radiation to pass through
Radiolucent (front of cassette)
The back of the cassete is made up of _____ to prevent backscatter radiation
Lead
The light produced is ______ to the xray exposure
Proportional
Used as a receptor for digital radiography (indirect conversion)
Charged Coupled Devices
CCD are physically small about
2-3 cm^2
Detects xrays and converts them into light
Xray scintillator
Materials used for xray scintillator
PSP
CsI scintillator
Reduces the size of the projected visible light image
Fiber optics tapers - lens
Converts light into an electric charge
CCDs
The number of light photons that reach the CCDs are less / light that are lost
Secondary Quantum Sink
Converts xray to light and then converts the light to electrical charges
Indirect conversion flat panel detector
It emits light proportional to the amount of energy absorb
Xray scintillator
Xray scintillator are made up of
CsI
Gd2O2S
Converts light to an electrical signal
Amorphous Silicon Photodiode
Signal in a form of a charge is read out by ______. Sends image to the computer
Thin Film Transistor
This crystal xan be shaped into 5-10 um wide needles arranged perpendicularly
Cesium Iodide
This reduces diffusion of light within the scintillator layer/ high quality
Cesium iodide
Resistant to mechanical stress and used for portable flat-panel detectors
Gadolinium Oxysulfide
Directly converts xray to electrical charges
Direct conversion detectors
Converts xray photons into electrical charges
Xray photoconductor
Most commonly used photoconductor
Amorphous selenium
Rotating selenium-dotted drum which has a positive electrical surface charge is exposed to xrays / limited to thorax stand
Selenium drum
Provides good resolution and can be used for both thorax stand and bucky tables
Flat-panel detector
The capacity of the detector to transfer the modulation of the input signal
Modulation Transfer Function
