Segmental biventricular analysis of myocardial function using high temporal and spatial resolution tissue phase mapping
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Myocardial dysfunction of the right ventricle (RV) is an important indicator of RV diseases, e.g. RV infarction or pulmonary hypertension. Tissue phase mapping (TPM) has been widely used to determine function of the left ventricle (LV) by analyzing myocardial velocities. The analysis of RV motion is more complicated due to the different geometry and smaller wall thickness. The aim of this work was to adapt and optimize TPM to the demands of the RV.
Materials and methods
TPM measurements were acquired in 25 healthy volunteers using a velocity-encoded phase-contrast sequence and kt-accelerated parallel imaging in combination with optimized navigator strategy and blood saturation. Post processing was extended by a 10-segment RV model and a detailed biventricular analysis of myocardial velocities was performed.
High spatio-temporal resolution (1.0 × 1.0 × 6 mm3, 21.3 ms) and the optimized blood saturation enabled good delineation of the RV and its velocities. Global and segmental velocities, as well as time to peak velocities showed significant differences between the LV and RV. Furthermore, complex timing of the RV could be demonstrated by segmental time to peak analysis.
High spatio-temporal resolution TPM enables a detailed biventricular analysis of myocardial motion and might provide a reliable tool for description and detection of diseases affecting left and right ventricular function.
KeywordsRight ventricle Tissue Phase Mapping Phase-contrast velocity mapping Biventricular analysis
We would like to thank Alexandra Mannweiler for recruiting volunteers and Adriana Komancsek for assistance in performing the MR examinations.
This research was supported by the Deutsche Forschungsgemeinschaft (DFG), Grant FO 507/3-1.
MM: Protocol/project development, Data collection or management, Data analysis; DF: Protocol/project development, Data collection or management, Data analysis; JH: Protocol/project development; BJ: Protocol/project development, Data collection or management, Data analysis.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
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