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Answer :
Final answer:
Sampling in digital imaging technology, like in SPECT or CT scanners, occurs at the Analog-to-Digital Converter (ADC). The ADC turns the analog signal from detectors into digital signals, translating into sample data points (or pixels) that allow for detailed images to be digitally constructed.
Explanation:
In digital imaging technology, the process of sampling usually occurs at the Analog-to-Digital Converter (ADC). The ADC serves a critical role in converting the continuous, analog signals received by detectors into discrete, digital signals. These digital signals then become data points, or samples, that can be processed, stored, or transmitted by a digital system.
For example, in biomedical imaging systems like Single-Photon-Emission Computer Tomography (SPECT) or CT scanners, detectors (such as CCD cameras, silicon tracking system or photomultiplier tubes) receive photons and convert the photon energy into an electrical charge, yielding an analog signal. The ADC then samples this analog signal, resulting in a digitized image that the computer can interpret.
Each individual sampled point is known as a pixel (picture element), and modern detectors can count and sample the photons in millions of pixels (megapixels, or MPs). This overall process allows for detailed three-dimensional images to be constructed from the sampled data.
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