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When manufacturing leg prostheses, accurate measurement of the geometry of residual limbs is essential. Conventionally, this is done using plaster casts or optical scanners. Ultrasound (US) appears to be a promising complementary method, as it can be used to scan internal structures such as bone and muscle tissue. In this paper, we demonstrate the feasibility of 3D reconstruction of skin surface and bone of an residual limb phantom using a US probe placed on the skin and localized by electromagnetic tracking. Different movement trajectories were investigated in order to capture as much of the limb as possible. Compared to a computed tomography (CT) reference image, a mean error of 2.3 mm was measured at 23 points distributed on the skin surface, while a mean error of 4.7 mm (n=20) was determined for the bone geometry.

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Ultrasound-based 3D Reconstruction of Residual Limbs using Electromagnetic Tracking

  • 会议论文

  • 发表日期：

    2025年

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  • Pauline Heine,
  • Luise Robra,
  • Jan Komposch,
  • Janis Börsig,
  • Jonas Bornmann,
  • Andreas Leiniger,
  • Rainer Brucher,
  • Alfred M. Franz

摘要

When manufacturing leg prostheses, accurate measurement of the geometry of residual limbs is essential. Conventionally, this is done using plaster casts or optical scanners. Ultrasound (US) appears to be a promising complementary method, as it can be used to scan internal structures such as bone and muscle tissue. In this paper, we demonstrate the feasibility of 3D reconstruction of skin surface and bone of an residual limb phantom using a US probe placed on the skin and localized by electromagnetic tracking. Different movement trajectories were investigated in order to capture as much of the limb as possible. Compared to a computed tomography (CT) reference image, a mean error of 2.3 mm was measured at 23 points distributed on the skin surface, while a mean error of 4.7 mm (n=20) was determined for the bone geometry.