A patient contact shield visible in the localizer—the effects to tube current modulation

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ID: 333205
2026
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Abstract
Abstract An anthropomorphic phantom was scanned with Siemens Somatom computed tomography scanners using tube current modulation (TCM). Thorax of the phantom was first scanned without the use of a contact shield, followed by a scan with a 0.5 mm lead equivalent out-of-plane shield placed in the localizer but 1 cm caudally outside the scanned volume. Scans were repeated using the scanner’s organ radiation dose reduction feature. Pitch values 0.35, 0.6, and 1.05 were used. With a pitch of 1.05, the effects of TCM varied between scanners from 4.35% to 356% when scanning toward the caudal end of the scanned volume, when shield was used outside the scanned volume. Also, with some scanners, the use of XCare increased the cumulative tube current.
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Authors Heli R S Larjava, Chibuzor Toivo Mark Eneh, Eini Niskanen, Lauri Järvinen, Joanna Sierpowska, Päivi Teerimäki, Jukka Järvinen, Virva Saunavaara, Minna Huuskonen, Hannele Niiniviita
Journal Radiation protection dosimetry
Year 2026
DOI
10.1093/rpd/ncag125
URL
https://doi.org/10.1093/rpd/ncag125
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