Bias, Repeatability and Reproducibility of Liver T1 Mapping With Variable Flip Angles.
Authors
Wilson, Daniel J
Shelley, David
Bainbridge, Gavin
Saysell, Margaret
Mendichovszky, Iosif A
Guthrie, J Ashley
Sourbron, Steven P
Publication Date
2022-02-27Journal Title
J Magn Reson Imaging
ISSN
1053-1807
Publisher
Wiley
Language
en
Type
Article
This Version
AO
VoR
Metadata
Show full item recordCitation
Tadimalla, S., Wilson, D. J., Shelley, D., Bainbridge, G., Saysell, M., Mendichovszky, I. A., Graves, M., et al. (2022). Bias, Repeatability and Reproducibility of Liver T1 Mapping With Variable Flip Angles.. J Magn Reson Imaging https://doi.org/10.1002/jmri.28127
Description
Funder: National Institute for Health Research; Id: http://dx.doi.org/10.13039/501100000272
Abstract
BACKGROUND: Three-dimensional variable flip angle (VFA) methods are commonly used for T1 mapping of the liver, but there is no data on the accuracy, repeatability, and reproducibility of this technique in this organ in a multivendor setting. PURPOSE: To measure bias, repeatability, and reproducibility of VFA T1 mapping in the liver. STUDY TYPE: Prospective observational. POPULATION: Eight healthy volunteers, four women, with no known liver disease. FIELD STRENGTH/SEQUENCE: 1.5-T and 3.0-T; three-dimensional steady-state spoiled gradient echo with VFAs; Look-Locker. ASSESSMENT: Traveling volunteers were scanned twice each (30 minutes to 3 months apart) on six MRI scanners from three vendors (GE Healthcare, Philips Medical Systems, and Siemens Healthineers) at two field strengths. The maximum period between the first and last scans among all volunteers was 9 months. Volunteers were instructed to abstain from alcohol intake for at least 72 hours prior to each scan and avoid high cholesterol foods on the day of the scan. STATISTICAL TESTS: Repeated measures ANOVA, Student t-test, Levene's test of variances, and 95% significance level. The percent error relative to literature liver T1 in healthy volunteers was used to assess bias. The relative error (RE) due to intrascanner and interscanner variation in T1 measurements was used to assess repeatability and reproducibility. RESULTS: The 95% confidence interval (CI) on the mean bias and mean repeatability RE of VFA T1 in the healthy liver was 34 ± 6% and 10 ± 3%, respectively. The 95% CI on the mean reproducibility RE at 1.5 T and 3.0 T was 29 ± 7% and 25 ± 4%, respectively. DATA CONCLUSION: Bias, repeatability, and reproducibility of VFA T1 mapping in the liver in a multivendor setting are similar to those reported for breast, prostate, and brain. LEVEL OF EVIDENCE: 1 TECHNICAL EFFICACY STAGE: 1.
Keywords
Research Article, Research Articles, T1 mapping, liver, VFA, reproducibility, repeatability, bias, precision
Sponsorship
Innovative Medicines Initiative (116106)
Identifiers
jmri28127
External DOI: https://doi.org/10.1002/jmri.28127
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334490
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.