Abstract
In this paper, the Radial Strain (RS) and Strain Rate (SR) was calculated using tagged MRI (tMRI) data. Using tagged magnetic resonance imaging (tMRI), the left ventricle short axis of five healthy adults (three men and two women) and four healthy male rats was imaged during diastolic and systolic phases on the mid-ventricle level. The RS and radial SR of the left ventricle were calculated at the mid-ventricular level of the cardiac cycle. The peak RS for rat and human heart was found to be 46.8 ± 0.68 and 40.7 ± 1.44, respectively, and it occurred at 40% of the cardiac cycle for both human and rat hearts. The peak systolic and diastolic radial SR for human heart was 1.10 ± 0.08 s- 1 and - 1.78 ± 0.02 s- 1, respectively, while it was 4.25 ± 0.02 s- 1 and - 5.16 ± 0.23 s- 1, respectively for rat heart. The results show that tMRI data can be used to characterize the cardiac function during systolic and diastolic phases of the cardiac cycle, and as a result, it can be used to evaluate the cardiac motion by calculating its RS and radial SR at different locations of the cardiac wall during both diastolic and systolic phases. This study also approves the validity of the tagged MRI data to accurately describe the radial cardiac motion.
Highlights
The typical orientation of the myocardial layers and its changes during systolic and diastolic phases is related to the left ventricle (LV) wall deformation in three directions: radial, circumferential, and longitudinal changes [1]How to cite this paper: Alenezy, M.D. (2015) Assessment of the Left Ventricle Wall Motion Using Tagged Magnetic Resonance Imaging Data
In the tagged MRI human images, the 6th slice position corresponded to the mid-ventricle level, while it was the 4th slice for tagged MRI animal images (Figure 4)
The left ventricle Radial Strain and radial Strain Rate (SR) were calculated at the mid-ventricular level during the complete cardiac cycle
Summary
The typical orientation of the myocardial layers and its changes during systolic and diastolic phases is related to the left ventricle (LV) wall deformation in three directions: radial, circumferential, and longitudinal changes [1]How to cite this paper: Alenezy, M.D. (2015) Assessment of the Left Ventricle Wall Motion Using Tagged Magnetic Resonance Imaging Data (tMRI). In the past few decades, to track the LV motion, markers had to be implanted on the LV wall; and measurements could only be done in animals or patients during cardiac surgery. This invasive method usually affects the accuracy of LV motion. Various measurement methods were used to evaluate the LV function; Noninvasive imaging techniques became available to characterize LV wall motion Among these techniques, cardiac magnetic resonance is the gold method, over the past years, efforts were focused to develop a standardized method to assess the LV motion and have facilitated the interpretation of LV motion before it could be used for cardiac evaluation [3] [4]
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