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  • Image digitization systems designed to convert an input signal taken from a television (TV) camera or from a charge-coupled device (CCD) into a digital signal and process the digital signal to obtain images that can be displayed on a TV monitor (usually after a digital-to-analog conversion) or in other computerized imaging systems. Hard-copy x-ray films of final images can also be made using a multi-image camera or a laser imager. These systems consist of an analog-to-digital converter, a high-speed digital memory, a digital storage device (e.g., optical disk), a digital-to-analog converter, and a controlling computer. Angiographic image digitization systems are designed to be added to existing angiographic or cardiovascular radiographic/fluoroscopic systems to perform a variety of computer- assisted x-ray image acquisition, processing, and display functions. Most of these combined systems are primarily used for digital subtraction angiography, a technology that involves the subtraction of a previous digital image from new images obtained after injecting a contrast agent into the patient.
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