Velocity mapping of the aortic flow at 9.4 T in healthy mice and mice with induced heart failure using time-resolved three-dimensional phase-contrast MRI (4D PC MRI)

P.R. Bovenkamp, T. Brix, F. Lindemann, R. Holtmeier, D. Abdurrachim, M.T. Kuhlmann, G.J. Strijkers, J. Stypmann, K.H. Hinrichs, V. Hörr

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Abstract

Objectives: In this study, we established and validated a time-resolved three-dimensional phase-contrast magnetic resonance imaging method (4D PC MRI) on a 9.4 T small-animal MRI system. Herein we present the feasibility of 4D PC MRI in terms of qualitative and quantitative flow pattern analysis in mice with transverse aortic constriction (TAC). Materials and methods: 4D PC FLASH images of a flow phantom and mouse heart were acquired at 9.4 T using a four-point phase-encoding scheme. The method was compared with slice-selective PC FLASH and ultrasound using Bland–Altman analysis. Advanced 3D streamlines were visualized utilizing Voreen volume-rendering software. Results: In vitro, 4D PC MRI flow profiles showed the transition between laminar and turbulent flow with increasing velocities. In vivo, 4D PC MRI data of the ascending aorta and the pulmonary artery were confirmed by ultrasound, resulting in linear regressions of R2 > 0.93. Magnitude- and direction-encoded streamlines differed substantially pre- and post-TAC surgery. Conclusions: 4D PC MRI is a feasible tool for in vivo velocity measurements on high-field small-animal scanners. Similar to clinical measurement, this method provides a complete spatially and temporally resolved dataset of the murine cardiovascular blood flow and allows for three-dimensional flow pattern analysis.

Original languageEnglish
Pages (from-to)315-327
Number of pages13
JournalMagnetic Resonance Materials in Physics, Biology and Medicine (MAGMA)
Volume28
Issue number4
DOIs
Publication statusPublished - 8 Nov 2014

Keywords

  • Blood flow velocity
  • Cardiovascular system
  • MRI
  • Small-animal imaging

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