Assessment of the effects of CT dose in averaged x-ray CT images of a dose-sensitive polymer gel

摘要: The signal-to-noise ratio achievable in x-ray computed tomography (CT) images of polymer gels can be increased by averaging over multiple scans each sample. However, repeated scanning delivers a small additional dose to the gel which may compromise accuracy measurement. In this study, NIPAM-based was irradiated and then CT scanned 25 times, with resulting data used derive an averaged image "zero-scan" gel. Comparison between these two results first scan showed that zero-scan provided better contrast, higher contrast-to- noise than initial scan. pixel values (Hounsfield units, HU) were not noticeably elevated, compared result gradients linear extrapolation symmetrically distributed around zero. These indicate artificially lightened small, delivered during scanning. This work demonstrates broader usefulness method as means verify dosimetric derived from data.