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The Multi-Stage Workflow of Image Acquisition, Extraction, and Digitization
The operational cycle of a Computed Radiography system is divided into four critical stages: Exposure, Stimulated Readout, Digitization, and Erasure.
Exposure: The patient is positioned, and the CR cassette is irradiated. The PSP plate captures the latent image.
Stimulated Readout: The technician inserts the cassette into a CR reader (digitizer). Inside, a high-intensity red laser beam (typically 680 nm) scans the plate in a raster pattern. This laser provides the necessary energy to "kick" the trapped electrons out of their traps.
Digitization: As the electrons return to a lower energy state, they release their stored energy as blue-violet light (approx. 400 nm). This light is collected by a light guide and directed to a Photomultiplier Tube (PMT) or a Charge-Coupled Device (CCD). These sensors convert the light into an analog electrical signal, which is then sent to an Analog-to-Digital Converter (ADC) to be mapped onto a pixel matrix.
Erasure: Because the laser readout only releases about 50% of the trapped energy, the plate must be "reset." The reader…
