7/7/2023 0 Comments Artifact meaning in cardiology![]() Artifact was visible in 4 ± 12, 42 ± 31, and 53 ± 27% of AHA segments in patients with ILRs, PPMs, and ICDs, respectively. 997 ± 26 ms respectively, p = 0.0001), but were similar after correction ( p = 0.57, residual difference 2 ± 27 ms). Results: T1 values in healthy volunteers with an ICD were underestimated compared to without (967 ± 52 vs. The accuracy of the correction was assessed in 10 healthy volunteers by measuring T1 before and after external placement of an ICD generator next to the chest to generate off-resonance. T1 correction was applied using a published relationship between off-resonance and T1. T1 values were measured by AHA segment, and segments with visual artifact were excluded. Paired mid-myocardial short-axis MOLLI and single breath-hold off-resonance field maps were acquired at 1.5 T. Methods: Twenty-four patients with cardiac implantable electronic devices (CIEDs: 46% permanent pacemakers, PPMs 33% implantable loop recorders, ILRs and 21% implantable cardioverter-defibrillators, ICDs) and 31 patients with aortic valve replacement (AVR) (45% metallic) were studied. Measurement is feasible in segments free from visual artifact, but there may still be off-resonance induced error.Īim: To quantify off-resonance induced T1 error in patients with metallic cardiovascular implants, and validate a method for error correction for a conventional MOLLI pulse sequence. 4National Institutes of Health, Bethesda, MD, United Statesīackground: Measurement of myocardial T1 is increasingly incorporated into standard cardiovascular magnetic resonance (CMR) protocols, however accuracy may be reduced in patients with metallic cardiovascular implants.3Istituto Auxologico Italiano (IRCCS), Istituto Auxologico Italiano, Milan, Italy.2Department of Cardiovascular Imaging, Barts Heart Centre, Barts Health NHS Trust, London, United Kingdom.1Institute for Cardiovascular Science, University College London, London, United Kingdom.Moon 1,2, Peter Kellman 4 and Charlotte H. Augusto 1,2, Camilla Torlasco 3, Katia Menacho 1,2, Clement Lau 2, Kush Patel 1,2, James C. Treibel 1,2, Andreas Seraphim 1,2, Paul Scully 1,2, Kristopher D.
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