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Elements of DR Imaging Systems

Elements of DR Imaging Systems. Capture element The element/material used to capture the x-ray photon Coupling element Transfers the x-ray generated signal to the collection element Fiber optics, lens, contact layer, or a-Se Collection element Photodiode, CCD, TFT, CMOS

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Elements of DR Imaging Systems

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  1. Elements of DR Imaging Systems • Capture element • The element/material used to capture the x-ray photon • Coupling element • Transfers the x-ray generated signal to the collection element • Fiber optics, lens, contact layer, or a-Se • Collection element • Photodiode, CCD, TFT, CMOS • Photodiodes, CCDs, and CMOS are light sensitive devices that collect light photons • TFT collect electrons

  2. Indirect w/ CCD and fiber optics Multiple detectors Single detector CCD Fiber optic coupling CsI capture element

  3. Indirect w/CMOS and lens

  4. Indirect TFT a-Si Coupling element

  5. Direct TFT

  6. Review of Indirect DR • Basically there are three types of indirect systems • CCD • A multitude of small CCD (charged coupled devices) receive light from the cesium iodide scintillator. • TFT • The light from scintillator is recorded by a TFT (thin film transistor) that is also called a flat panel detector. • CMOS (complementary metal oxide semiconductor) • A lens focuses light on the CMOS chip

  7. Flat panel technology (TFT)indirect and direct DR applications

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