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Oostveen, Luuk J.; Boedeker, Kirsten L.; Brink, Monique; Prokop, Mathias; de Lange, Frank; Sechopoulos, Ioannis

Physical evaluation of an ultra-high-resolution CT scanner

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  • Media type: E-Article
  • Title: Physical evaluation of an ultra-high-resolution CT scanner
  • Contributor: Oostveen, Luuk J.; Boedeker, Kirsten L.; Brink, Monique; Prokop, Mathias; de Lange, Frank; Sechopoulos, Ioannis
  • imprint: Springer Science and Business Media LLC, 2020
  • Published in: European Radiology
  • Language: English
  • DOI: 10.1007/s00330-019-06635-5
  • ISSN: 0938-7994; 1432-1084
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title><jats:sec> <jats:title>Objectives</jats:title> <jats:p>To evaluate the technical performance of an ultra-high-resolution CT (UHRCT) system.</jats:p> </jats:sec><jats:sec> <jats:title>Methods</jats:title> <jats:p>The physico-technical capabilities of a novel commercial UHRCT system were assessed and compared with those of a current-generation multi-detector (MDCT) system. The super-high-resolution (SHR) mode of the system uses 0.25 mm (at isocentre) detector elements (dels) in the in-plane and longitudinal directions, while the high-resolution (HR) mode bins two dels in the longitudinal direction. The normal-resolution (NR) mode bins dels 2 × 2, resulting in a del-size equivalent to that of the MDCT system. In general, standard procedures and phantoms were used to perform these assessments.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>The UHRCT MTF (10% MTF 4.1 lp/mm) is twice as high as that of the MDCT (10% MTF 1.9 lp/mm), which is comparable to the MTF in the NR mode (10% MTF 1.7 lp/mm). The width of the slice sensitivity profile in the SHR mode (FWHM 0.45 mm) is about 60% of that of the MDCT (FWHM 0.77 mm). Uniformity and CT numbers are within the expected range. Noise in the high-resolution modes has a higher magnitude and higher frequency components compared with MDCT. Low-contrast visibility is lower for the NR, HR and SHR modes compared with MDCT, but about a 14%, for NR, and 23%, for HR and SHR, dose increase gives the same results.</jats:p> </jats:sec><jats:sec> <jats:title>Conclusions</jats:title> <jats:p>HR and SHR mode scanning results in double the spatial resolution, with about a 23% increase in dose required to achieve the same low-contrast detectability.</jats:p> </jats:sec><jats:sec> <jats:title>Key Points</jats:title> <jats:p><jats:italic>• Resolution on UHRCT is up to twice as high as for the tested MDCT.</jats:italic></jats:p> <jats:p><jats:italic>• With abdominal settings, UHRCT needs higher dose for the same low-contrast detectability as MDCT, but dose is still below achievable levels as defined by current diagnostic reference levels.</jats:italic></jats:p> <jats:p><jats:italic>• The UHRCT system used in normal-resolution mode yields comparable resolution and noise characteristics as the MDCT system.</jats:italic></jats:p> </jats:sec>