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Examination of rapid adjustment system based on screen score obtained using continuous shear wave elastography

  • Original Article–Physics & Engineering
  • Published:
Journal of Medical Ultrasonics Aims and scope Submit manuscript

Abstract

Purpose

Continuous shear wave elastography (C-SWE) can be expected to be applied to portable muscle elasticity diagnosis. To establish diagnostic technology, it will be necessary to improve measurement techniques and quantitative measurement accuracy.

Methods

In this study, we investigated two screen scores: the quality index (Q-index), which determines whether the intensity of a power Doppler image is appropriate, and the shear wave propagation direction index (SWDI), which determines the uniformity of shear wave propagation.

Results

First, we performed numerical simulations with white noise and found that the coefficient of variation of shear wave velocity estimation was less than 5% when the normalized Q-index was greater than 0.27. Furthermore, regarding the SWDI, we clarified the relationship between the standard deviation in shear wave propagation direction and the SWDI. Next, the relationship between the Q-index and coefficient of variation of estimated shear wave velocity was evaluated through experiments using a tissue-mimicking phantom. The results showed that there was a negative correlation between the Q-index and the coefficient of variation, and the fluctuation of the propagation velocity could be inferred from the Q-index. Finally, we showed the results of applying the screen scores to muscle relaxation monitoring and confirmed its usefulness in clinical applications.

Conclusion

By applying the screen scores, we showed improved stability in speed estimation in C-SWE, and demonstrated the possibility of clinical applicability.

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Acknowledgements

Part of this work was supported by JSPS KAKENHI Grant Number 22K04134 and the Cooperative Research Project of Research Center for Biomedical Engineering.

Author information

Authors and Affiliations

  1. Institute of Innovative Research, Tokyo Institute of Technology, 4259 R2-25, Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa, 226-8503, Japan

    Marie Tabaru

  2. Graduate School of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu-shi, Gunma, 376-8515, Japan

    Ren Koda & Yoshiki Yamakoshi

  3. Department of Orthopaedic Surgery, Graduate School of Medicine, Gunma University, Maebashi-shi, Gunma, 371-8511, Japan

    Hitoshi Shitara & Hirotaka Chikuda

Authors
  1. Marie Tabaru
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  2. Ren Koda
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  3. Hitoshi Shitara
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  4. Hirotaka Chikuda
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  5. Yoshiki Yamakoshi
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Corresponding author

Correspondence to Yoshiki Yamakoshi.

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Conflict of interest

The authors declare that there are no conflicts of interest.

Ethical approval

The experiment involving application of scores to muscle relaxation monitoring was approved by the Ethics Committee of Gunma University Hospital as “research on measuring muscle elasticity of skeletal muscles using continuous shear wave elastography.” It was conducted with written and verbal consent.

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Supplementary Information

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10396_2024_1439_MOESM1_ESM.pptx

Movie 1: Examples of shear wave records of biceps brachii. PD image records considered to be of (a) high and (b) low quality. Movie 2: Examples of shear wave propagation direction records of vastus lateralis muscle with (a) high and (b) low SWDI values. Movie 3: Results of shear wave records of vastus lateralis muscle in clinical study. PD image records of Frame #5, #25, and #51 are high-quality images. PD image records of Frame #46 have low SWDI. PD image records of Frame #43 of CV is larger than 20%. Images of Frame #43 and #46 are excluded. Movie 4: Results of shear wave records of vastus lateralis muscle in clinical study. Shear wave propagation direction records for high-quality images (Frame #5, #25, and #51) and excluded images (Frame #43 and #46)

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Tabaru, M., Koda, R., Shitara, H. et al. Examination of rapid adjustment system based on screen score obtained using continuous shear wave elastography. J Med Ultrasonics (2024). https://doi.org/10.1007/s10396-024-01439-7

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  • DOI: https://doi.org/10.1007/s10396-024-01439-7

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