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Benefits and Challenges of Digital Radiography
Benefits: Quick image display, less radiation, easier storage.
Challenges: Equipment cost, need for computer storage, sensor fragility.
Equipment for Digital Radiography
Needs: x-ray machine with short exposure time, sensor or plate, computer with monitor and storage capacity.
Characteristics of a Digital Image
Digital images are made of pixels, with more pixels meaning clearer images.
Gray scale (shades of gray) helps show subtle details in x-rays.
Types of Digital Image Receptors
Direct (sensor sends image directly to the computer)
Indirect (plate must be scanned to create an image).
Direct Digital Imaging
Uses sensors (CCD or CMOS) to instantly send the image to a computer screen.
Sensor Types and Range
CCD sensors have a narrow range and capture more detail.
CMOS sensors are often wireless but with a narrower range.
PSP sensors have the widest range
Wireless Sensor Limitations
Convenient but can be affected by other signals and are more expensive than wired options.
Sensor Sizes
Sensors come in sizes (0,1,2) similar to film and may have contoured edges for comfort.
Indirect Digital Imaging (PSP)
PSP plates capture images that must be scanned to display on a computer, without a direct connection.
PSP Image Storage
PSP plates store x-ray energy as a hidden image, which a scanner reads to create a digital image.
PSP Scanning Process
Plates are placed in a scanner, which uses a laser to read and display the image on a monitor.
PSP Limitations
PSP images take longer to produce, have lower resolution, and plates need clearing before reuse.
Radiation Exposure
CMOS sensors need less radiation than CCD and PSP sensors.