Evaluation of self-calibrated non-linear phase-contrast correction in pediatric and congenital cardiovascular magnetic resonance imaging.
Pediatr Radiol
; 50(5): 656-663, 2020 05.
Article
em En
| MEDLINE
| ID: mdl-32047987
ABSTRACT
BACKGROUND:
The need for background error correction in phase-contrast flow analysis has historically posed a challenge in cardiac magnetic resonance (MR) imaging. While previous studies have shown that phantom correction improves flow measurements, it impedes scanner workflow.OBJECTIVE:
To evaluate the efficacy of self-calibrated non-linear phase-contrast correction on flows in pediatric and congenital cardiac MR compared to phantom correction as the standard. MATERIALS ANDMETHODS:
We retrospectively identified children who had great-vessel phase-contrast and static phantom sequences acquired between January 2015 and June 2015. We applied a novel correction method to each phase-contrast sequence post hoc. Uncorrected, non-linear, and phantom-corrected flows were compared using intraclass correlation. We used paired t-tests to compare how closely non-linear and uncorrected flows approximated phantom-corrected flows. In children without intra- or extracardiac shunts or significant semilunar valvular regurgitation, we used paired t-tests to compare how closely the uncorrected pulmonary-to-systemic flow ratio (QpQs) and non-linear QpQs approximated phantom-corrected QpQs.RESULTS:
We included 211 diagnostic-quality phase-contrast sequences (93 aorta, 74 main pulmonary artery [MPA], 21 left pulmonary artery [LPA], 23 right pulmonary artery [RPA]) from 108 children (median age 15 years, interquartile range 11-18 years). Intraclass correlation showed strong agreement between non-linear and phantom-corrected flow measurements but also between uncorrected and phantom-corrected flow measurements. Non-linear flow measurements did not more closely approximate phantom-corrected measurements than did uncorrected measurements for any vessel. In 39 children without significant shunting or regurgitation, mean non-linear QpQs (1.07; 95% confidence interval [CI] = 1.01, 1.13) was no closer than mean uncorrected QpQs (1.06; 95% CI = 1.00, 1.13) to mean phantom-corrected QpQs (1.02; 95% CI = 0.98, 1.06).CONCLUSION:
Despite strong agreement between self-calibrated non-linear and phantom correction, cardiac flows and shunt calculations with non-linear correction were no closer to phantom-corrected measurements than those without background correction. However, phantom-corrected flows also demonstrated minimal differences from uncorrected flows. These findings suggest that in the current era, more accurate phase-contrast flow measurements might limit the need for background correction. Further investigation of the clinical impact and optimal methods of background correction in the pediatric and congenital cardiac population is needed.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Artéria Pulmonar
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Imageamento por Ressonância Magnética
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Cardiopatias Congênitas
Tipo de estudo:
Diagnostic_studies
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Observational_studies
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Prognostic_studies
Limite:
Adolescent
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Child
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Female
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Humans
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Male
Idioma:
En
Revista:
Pediatr Radiol
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Estados Unidos