Development of a method using transperineal ultrasound movies for automatic evaluation of the contraction of pelvic floor muscles in men after radical prostatectomy

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  • Saito Haruna
    Department of Nursing, Tohoku University School of Medicine, Health Sciences
  • Kahaer Danniyaer
    Department of Precision Machinery Engineering, School of Engineering, Tokyo Denki University
  • Kuwana Kenta
    Department of Precision Machinery Engineering, School of Engineering, Tokyo Denki University
  • Matsunaga Akiko
    Department of Rehabilitation Medicine, The University of Tokyo Hospital
  • Kawajiri Maiko
    Department of Women's Health Nursing & Midwifery, Tohoku University Graduate School of Medicine
  • Takeishi Yoko
    Department of Women's Health Nursing & Midwifery, Tohoku University Graduate School of Medicine
  • Nakamura Yasuka
    Department of Women's Health Nursing & Midwifery, Tohoku University Graduate School of Medicine
  • Yoshizawa Toyoko
    Department of Women's Health Nursing & Midwifery, Tohoku University Graduate School of Medicine
  • Yoshida Mikako
    Department of Women's Health Nursing & Midwifery, Tohoku University Graduate School of Medicine

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Other Title
  • 前立腺全摘除術後の経会陰超音波動画像を用いて骨盤底筋の収縮を自動評価する手法の開発

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Aim: We aimed to develop a method to automatically evaluate pelvic floor muscle (PFM) contractions using transperineal ultrasound movies of male patients after radical prostatectomy. Methods: Forty transperineal ultrasound movies obtained in a previous study were used. From the discussion between two expert PFMtrainers and automatic trackability, the distance from the pubis to the anorectal junction was determined to be the primary parameter. Seven algorithms were tested to track the pubis and the anorectal junction. The pubis-anorectal junction distance, measured using a software, were compared on two levels of PFMcontraction (good/moderate) subjectively evaluated. Result: Among the seven algorithms, Kernelized Correlation Filter could track the pubis and the anorectal junction during PFM contraction in the 40 movies. The frame rate (fps) was 66‒77 in the Kernelized Correlation Filter. The changing rates of the pubis-anorectal junction distance in the vector and the X-axis lengths were significantly different between the good and moderate contractions that were subjectively evaluated. Conclusion: A method for tracking the pubis and the anorectal junction in ultrasound movies after radical prostatectomy was developed to automatically evaluate PFMcontractions.

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