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Computed Radiography (CR) Imaging Plate
In a Computed Radiography (CR) X-ray system, the imaging plate (IP) uses a solid-state photostimulable phosphor (PSP) rather than liquid film developer chemicals. This PSP material stores the X-ray image as trapped energy within its crystal structure.
Chemical Name / Formula:
Europium-activated Barium Fluorohalide
Formula: BaFX:Eu²⁺ (where X is a mixture of Bromine (Br⁻) and Iodine (I⁻))
Description:
- Form: Fine, inorganic crystalline powder embedded in a binder, coated on a flexible, light-tight plastic substrate.
- Mechanism: When exposed to X-rays, electrons are trapped in crystal defects, creating a latent image of stored energy.
- Reader Process: A red laser stimulates the plate, releasing stored energy as blue light (photostimulated luminescence) which is converted into a digital image.
- Reusability: The plate is erased by exposure to intense white light after reading, making it reusable for multiple scans.
Use / Applications:
- Medical & Dental Imaging: Routine radiography including chest, bone, and mammography.
- Industrial NDT: Non-Destructive Testing for welding inspection, aerospace, and oil/gas pipelines.
- Advantages: Digital workflow, elimination of chemical processing, and compatibility with conventional X-ray systems.
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