Infographics / Digital Radiography

CCD-Based Digital Radiography Detector

Left: x-rays strike a scintillator (CsI or gadolinium oxysulphide) that emits visible light, which is carried by a demagnifying fibre-optic taper to a small CCD silicon chip. Right: the CCD is a fixed array of pixel wells, each storing a charge packet generated by absorbed light; charge is shifted row-by-row down into a serial readout register and along to a readout amplifier, producing an electronic voltage signal.

Charge-coupled device (CCD) detector: optical coupling and charge-transfer readout Left: x-rays strike a scintillator (CsI or gadolinium oxysulphide) that emits visible light, which is carried by a demagnifying fibre-optic taper to a small CCD silicon chip. Right: the CCD is a fixed array of pixel wells, each storing a charge packet generated by absorbed light; charge is shifted row-by-row down into a serial readout register and along to a readout amplifier, producing an electronic voltage signal. optical coupling x-rays scintillator CsI / Gd2O2S — x-rays to visible light light fibre-optic taper (demagnifies) CCD (silicon) charge-transfer readout pixel well (charge in teal) row-by-row vertical shift readout amplifier voltage out serial shift to amplifier light absorbed in silicon creates electron-hole pairs — a charge packet in each pixel well charge shifts well-to-well (bucket-brigade) and is read out as a voltage: an electronic signal
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