Abstract
The perceived image quality in computed tomographic (CT) scanning is determined by the image noise, image contrast, spatial resolution, and artifacts. The knowledge of physical basis of these determinants and scanning parameters affecting them helps in designing CT protocols that can achieve diagnostically acceptable image quality at acceptable radiation doses. The emerging CT scanning techniques such as automated tube current modulation, optimal tube voltage, and use of iterative image re-construction have allowed considerable reduction in radiation dose without compromising the image quality. The article provides a brief description of each of these scanning techniques. As CT has remained the workhorse of medical imaging and the risks of medical radiation exposure have gained far more attention than before, radiologists need to understand these scanning techniques and incorporate them into the clinical practice.
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