Ultrasound imaging in lower limb prosthetics

Douglas, Tania S.; Solomonidis, S.E.; Sandham, W.A.; Spence, William

doi:10.1109/tnsre.2002.1021582

Cited by 38 publications

(29 citation statements)

References 37 publications

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“…Further, non-invasive imaging has been used to study the geometry of the residual limb, e.g. based on magnetic resonance imaging (MRI) [31], [32] and ultrasound [33]. Some authors have proposed frameworks for socket design and evaluation based on non-invasive imaging and computational modeling.…”

Section: Introductionmentioning

confidence: 99%

Automated and Data-driven Computational Design of Patient-Specific Biomechanical Interfaces

Moerman¹,

Sengeh²,

Herr³

2016

Preprint

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Abstract-Biomechanical interfaces are mechanical structures that form the connection between a device and a tissue region, and, through appropriate load transfer, aim to minimize tissue discomfort and injury. A patient-specific and data-driven computational framework for the automated design of biomechanical interfaces is presented here. Optimization of the design of biomechanical interfaces is complex since it is affected by the interplay of the geometry and mechanical properties of both the tissue and the interface. The proposed framework is presented for the application of transtibial amputee prostheses where the interface is formed by a prosthetic liner and socket. Conventional socket design and manufacturing is largely artisan, non-standard, and insufficiently data-driven, leading to discrepancies between the quality of sockets produced by different prosthetists. Furthermore, current prosthetic liners are often not patient-specific. The proposed framework involves: A) non-invasive imaging to record patient geometry, B) indentation to assess tissue mechanical properties, C) data-driven and automated creation of patientspecific designs, D) patient-specific finite element analysis (FEA) and design evaluation, and finally E) computer aided manufacturing. Uniquely, the FEA procedure controls both the design and mechanical properties of the devices, and simulates, not only the loading during use, but also the pre-load induced by the donning of both the liner and the socket independently. Through FEA evaluation, detailed information on internal and external tissue loading, which are directly responsible for discomfort and injury, are available. Further, these provide quantitative evidence on the implications of design choices, e.g. : 1) alterations in the design can be used to locally enhance or reduce tissue loading, 2) compliant features can aid in relieving local surface pressure. The proposed methods form a patient-specific, data-driven and repeatable design framework for biomechanical interfaces, and by enabling FEA-based optimization reduces the requirement for repeated patient involvement in the currently manual and iterative design process.

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Section: Introductionmentioning

confidence: 99%

Automated and Data-driven Computational Design of Patient-Specific Biomechanical Interfaces

Moerman¹,

Sengeh²,

Herr³

2016

Preprint

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“…Multiple research groups have pursued volumetric ultrasound imaging of limbs with varying levels of success 24 . Several systems have been developed for three-dimensional images of the residual limb of amputees [25][26][27][28] .…”

Section: Prostheticsmentioning

confidence: 99%

“…Improved ergonomics, ease of use, and simplified mechanical configuration are necessary to advance such systems to routine clinical practice. Limb motion is difficult to compensate for and degrades image resolution 24 . In previously developed systems, motion compensation for image registration was completed exclusively through matching common image features.…”

Section: Prostheticsmentioning

confidence: 99%

Enhanced ultrasound for advanced diagnostics, ultrasound tomography for volume limb imaging and prosthetic fitting

Anthony

2016

SPIE Proceedings

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Ultrasound imaging methods hold the potential to deliver low-cost, high-resolution, operator-independent and nonionizing imaging systems -such systems couple appropriate algorithms with imaging devices and techniques. The increasing demands on general practitioners motivate us to develop more usable and productive diagnostic imaging equipment. Ultrasound, specifically freehand ultrasound, is a low cost and safe medical imaging technique. It doesn't expose a patient to ionizing radiation. Its safety and versatility make it very well suited for the increasing demands on general practitioners, or for providing improved medical care in rural regions or the developing world. However it typically suffers from sonographer variability; we will discuss techniques to address user variability.We also discuss our work to combine cylindrical scanning systems with state of the art inversion algorithms to deliver ultrasound systems for imaging and quantifying limbs in 3-D in vivo. Such systems have the potential to track the progression of limb health at a low cost and without radiation exposure, as well as, improve prosthetic socket fitting. Current methods of prosthetic socket fabrication remain subjective and ineffective at creating an interface to the human body that is both comfortable and functional. Though there has been recent success using methods like magnetic resonance imaging and biomechanical modeling, a low-cost, streamlined, and quantitative process for prosthetic cup design and fabrication has not been fully demonstrated. Medical ultrasonography may inform the design process of prosthetic sockets in a more objective manner. This keynote talk presents the results of progress in this area.

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“…Several methods for the measurement of residual limb volume exist: circumferential residual limb measurement [7], water immersion measurement [10], cast filling, contact scanning methods [11], laser scanning methods [8,[12][13], ultrasound measurement [14], bioimpedence [15], (spiral) computed tomography scans [16][17], and magnetic resonance imaging scans [18].…”

Section: Introductionmentioning

confidence: 99%

Reduction of residual limb volume in people with transtibial amputation

et al. 2014

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Abstract-The early postoperative phase after transtibial amputation is characterized by rapid residual limb volume reduction. Accurate measurement of residual limb volume is important for the timing of fitting a prosthesis. The aim of this study was to analyze the reduction of residual limb volume in people with transtibial amputation and to correlate residual limb volume with residual limb circumference. In a longitudinal cohort study of 21 people who had a transtibial amputation, residual limb volume was measured using a laser scanner and circumference was measured using a tape measure 1 wk postamputation and every 3 wk thereafter until 24 wk postamputation. A linear mixed model analysis was performed with weeks postamputation transformed according to the natural logarithm as predictor. Residual limb volume decreased significantly over time, with a large variation between patients. Residual limb volume did not correlate well with circumference. On average, residual limb volume decreased 200.5 mL (9.7% of the initial volume) per natural logarithm of the weeks postamputation. The decrease in residual limb volume following a transtibial amputation was substantial in the early postamputation phase, followed by a leveling off. It was not possible to determine the specific moment at which the residual limb volume stabilized.

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Ultrasound imaging in lower limb prosthetics

Cited by 38 publications

References 37 publications

Automated and Data-driven Computational Design of Patient-Specific Biomechanical Interfaces

Automated and Data-driven Computational Design of Patient-Specific Biomechanical Interfaces

Enhanced ultrasound for advanced diagnostics, ultrasound tomography for volume limb imaging and prosthetic fitting

Reduction of residual limb volume in people with transtibial amputation

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