Abstract
Magnetic resonance elastography (MRE) can visualize the shear wave propagation of in vivo tissues, which can be mapped into viscoelastic properties. No study has measured the biomechanical properties of the PM muscle in vivo using MRE. In this study, we evaluated stiffness values calculated by local frequency estimate (LFE) and algebraic inversion of differential equation (AIDE) in PM-MRE. The PM muscles of 17 healthy male volunteers were scanned in supine position by MRE. The Laplacian-based estimate (LBE) phase wrapped image data were filtered by gaussian-bandpass filter (GBF), and by both directional and GBF. LFE (MREWave) and AIDE wave inversion methods were used to calculate the respective elastograms. The wave interferences were removed by directional filtering, and smooth wave fields were obtained. The stiffness values calculated by LFE of non-DF images were 1.39 ± 0.25 kPa and 1.33 ± 0.22 kPa for right and left PM respectively, whereas for DF images, they were 1.26 ± 0.20 kPa for right PM and 1.18 ± 0.28 kPa for left PM. The stiffness values calculated by AIDE of non-DF images were 0.78 ± 0.10 kPa and 0.78 ± 0.13 kPa for right and left PM respectively, whereas for DF images, they were 0.73 ± 0.12 kPa for right PM and 0.74 ± 0.11 kPa for left PM. There was no statistically significant difference in mean values of stiffness with/without applying directional filter whereas there was a statistically significant difference in mean values of stiffness between LFE and AIDE. Both LFE and AIDE could be used for psoas major MR Elastography.
Highlights
Palpation has been in clinical practice for disease diagnosis by medical doctors and health workers [1]
We evaluated stiffness values calculated by local frequency estimate (LFE) and algebraic inversion of differential equation (AIDE) in psoas major (PM)-Magnetic resonance elastography (MRE)
The purpose of this study was to evaluate the use of directional filter in wave image processing and to analyse the mean stiffness values of PM muscle by using LFE and AIDE in MRE
Summary
Palpation has been in clinical practice for disease diagnosis by medical doctors and health workers [1]. Elasticity has garnered keen interest among medical professionals for its ability to differentiate healthy and diseased tissues. Given this circumstance, elastography (a term first coined by Ophir et al [6]) has come into play with ultrasound and MRI technologies. The stiffness values range over several orders of magnitude, allowing for excellent contrast between a lesion and its surrounding normal tissues [5]. All, these techniques are able to quantify the sensory palpation, making it extendible virtually to deep tissues
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