biostudies-literatureUnknown26(9)Li B<h4>Background</h4>Ultra-wide coverage CT (> 128 detector rows) makes it possible to image a heart or brain in a single rotation but are associated with large cone angles, which can severely degrade the image quality.<h4>Purpose</h4>This study evaluate the image quality and artifact levels of a dual-focal-spot single-detector (DFSSD) CT geometry designed to achieve 140 mm z-axis coverage, through a simulation study.<h4>Methods</h4>The DFSSD CT system employs two x-ray focal spots spaced 90 mm apart along the z-axis and a 100 mm CT detector. It provides 140 mm z-axis coverage at the iso-center. A research CT simulation package (CatSim) was employed throughout this study. To compare the image quality, three system geometries were simulated: (A) single focal spot with 40 mm detector (VCT40), Journal of applied clinical medical physicse70220https://www.ebi.ac.uk/biostudies/studies/S-EPMC12401943biostudies-literatureDual-focal-spot single-detector CT: A simulation study to assess cone-beam artifacts and noise.PMC12401943Li BTang XfalseDual-focal-spot single-detector CT: A simulation study to assess cone-beam artifacts and noise.<h4>Background</h4>Ultra-wide coverage CT (> 128 detector rows) makes it possible to image a heart or brain in a single rotation but are associated with large cone angles, which can severely degrade the image quality.<h4>Purpose</h4>This study evaluate the image quality and artifact levels of a dual-focal-spot single-detector (DFSSD) CT geometry designed to achieve 140 mm z-axis coverage, through a simulation study.<h4>Methods</h4>The DFSSD CT system employs two x-ray focal spots spaced 90 mm apart along the z-axis and a 100 mm CT detector. It provides 140 mm z-axis coverage at the iso-center. A research CT simulation package (CatSim) was employed throughout this study. To compare the image quality, three system geometries were simulated: (A) single focal spot with 40 mm detector (VCT40), 2025-01-01T00:00:00Z2025 Sep2026-05-29T18:46:32.802Z2026-04-08T05:43:50.52ZS-EPMC124019434089095210.1002/acm2.70220