Reproducibility and observer variability of tissue phase mapping for the quantification of regional myocardial velocities

Kai Lin, Varun Chowdhary, Keith H. Benzuly, Clyde W. Yancy, Jon W. Lomasney, Vera H. Rigolin, Allen S. Anderson, Jane Wilcox, James Carr, Michael Markl*

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

To systematically investigate the reproducibility of global and segmental left ventricular (LV) velocities derived from tissue phase mapping (TPM). Breath held and ECG synchronized TPM data (spatial/temporal resolution = 2 × 2 mm2/20.8 ms) were acquired in 18 healthy volunteers. To analyze scan–rescan variability, TPM was repeated in all subjects during a second visit separated by 16 ± 5 days. Data analysis included LV segmentation, and quantification of global and regional (AHA 16-segment modal) metrics of LV function [velocity–time curves, systolic and diastolic peak and time-to-peak (TTP) velocities] for radial (Vr), long-axis (Vz) and circumferential (VΦ) LV velocities. Mean velocity time curves in basal, mid-ventricular, and apical locations showed highly similar LV motion patterns for all three velocity components (Vr, VΦ, Vz) for scan and rescan. No significant differences for both systolic and diastolic peak and TTP myocardial velocities were observed. Segmental analysis revealed similar regional peak Vr and Vz during both systole and diastole except for three LV segments (p = 0.045, p = 0.033, and p = 0.009). Excellent (p < 0.001) correlations between scans and rescan for peak Vr (R2 = 0.92), peak Vz (R2 = 0.90), radial TTP (R2 = 0.91) and long-axis TTP (R2 = 0.88) confirmed good agreement. Bland–Altman analysis demonstrated excellent intra-observer and good inter-observer analysis agreement but increased variability for long axis peak velocities. TPM based analysis of global and regional myocardial velocities can be performed with good reproducibility. Robustness of regional quantification of long-axis velocities was limited but spatial velocity distributions across the LV could reliably be replicated.

Original languageEnglish (US)
Pages (from-to)1227-1234
Number of pages8
JournalInternational Journal of Cardiovascular Imaging
Volume32
Issue number8
DOIs
StatePublished - Aug 1 2016

Keywords

  • Function
  • Left ventricle
  • Reproducibility
  • Tissue phase mapping
  • Velocity

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

Fingerprint Dive into the research topics of 'Reproducibility and observer variability of tissue phase mapping for the quantification of regional myocardial velocities'. Together they form a unique fingerprint.

  • Cite this