Deposition Substrate Reflective Layer for Scintillator Uniformity
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Solution Overview
Problem
Conventional scintillator panels with scintillator layers on deposition substrates suffer from poor cuttability, nonuniform sharpness, and irregularities due to abnormal growth of columnar phosphor crystals, leading to cracks and reduced image quality in radiographic images.
Innovation Solution
A deposition substrate with a reflective layer containing light-scattering particles buried in a binder resin, where the surface irregularities are softened during deposition, preventing columnar phosphor crystals from growing beyond 5.0 μm in diameter, ensuring uniform and sharp radiographic images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the phosphor layer is increased to improve luminous efficiency, then the signal-to-noise ratio is enhanced, but light scattering increases and image sharpness deteriorates
Solution Approach 1:
The patent applies local quality by creating columnar phosphor crystals with specific orientations and uniform diameters (not exceeding 5.0 μm) that guide light locally through the phosphor layer. This localized light guidance structure allows increased phosphor thickness for better signal detection while maintaining image sharpness through controlled light paths.
Solution Approach 2:
The patent changes the physical parameters of the phosphor layer by controlling crystal diameter to not exceed 5.0 μm and establishing specific columnar structures. These parameter changes optimize both light guidance for sharpness and thickness for luminous efficiency, resolving the contradiction between signal-to-noise ratio and image sharpness.
2Ease of manufacture
If conventional deposition substrates are used, then manufacturing is simpler, but abnormal crystal growth occurs leading to poor cuttability and nonuniform sharpness
Solution Approach 1:
The patent applies preliminary action by providing a reflective layer with controlled surface irregularities before phosphor deposition. This pre-prepared substrate structure guides the phosphor crystal growth to achieve uniform columnar structures with diameters not exceeding 5.0 μm, preventing abnormal growth while maintaining manufacturing simplicity.
Solution Approach 2:
The reflective layer acts as an intermediary between the deposition substrate and the phosphor layer. It mediates the crystal growth process by providing a surface with controlled irregularities that promote uniform columnar crystal formation, thereby improving cuttability and sharpness uniformity without complicating the overall manufacturing process.
3Illumination intensity
If columnar phosphor crystals grow beyond 5.0 μm in diameter, then light guidance effect is stronger, but abnormal growth causes cracks and reduces image quality
Solution Approach 1:
The patent optimizes the crystal diameter parameter by controlling it to not exceed 5.0 μm through the reflective layer structure. This parameter optimization maintains sufficient light guidance effect for image quality while preventing the structural defects and cracks associated with excessive crystal growth.
Data Source
AI summary
The scintillator panel includes a support, a reflective layer on the support, and a scintillator layer formed on the reflective layer by deposition. The reflective layer includes light-scattering particles and a binder resin. The light scattering particles are buried in the binder resin such that there is an area free of light scattering particles in the reflective layer.