Surface Accelerometer Fixation Method Affects Leg Soft Tissue Motion Following Heel Impacts

2013 ◽  
Author(s):  
Jennifer M. Stefanczyk ◽  
Evan A. Brydges ◽  
Timothy A. Burkhart ◽  
William Altenhof ◽  
David M. Andrews
Keyword(s):  
Soft Tissue ◽  
Fixation Method ◽  
Soft Tissue Motion ◽  
Tissue Motion

scholarly journals Real-time soft tissue motion estimation for lung tumors during radiotherapy delivery

2013 ◽  
Vol 40 (9) ◽  
pp. 091713 ◽  
Author(s):  
Joerg Rottmann ◽  
Paul Keall ◽  
Ross Berbeco
Keyword(s):  
Soft Tissue ◽  
Motion Estimation ◽  
Real Time ◽  
Lung Tumors ◽  
Soft Tissue Motion ◽  
Tissue Motion

Soft tissue motion tracking with application to tablet-based incision planning in laser surgery

2016 ◽  
Vol 11 (12) ◽  
pp. 2325-2337 ◽  
Author(s):  
Andreas Schoob ◽  
Max-Heinrich Laves ◽  
Lüder Alexander Kahrs ◽  
Tobias Ortmaier
Keyword(s):  
Soft Tissue ◽  
Laser Surgery ◽  
Motion Tracking ◽  
Soft Tissue Motion ◽  
Tissue Motion

scholarly journals Stereo vision-based tracking of soft tissue motion with application to online ablation control in laser microsurgery

2017 ◽  
Vol 40 ◽  
pp. 80-95 ◽  
Author(s):  
Andreas Schoob ◽  
Dennis Kundrat ◽  
Lüder A. Kahrs ◽  
Tobias Ortmaier
Keyword(s):  
Soft Tissue ◽  
Stereo Vision ◽  
Laser Microsurgery ◽  
Soft Tissue Motion ◽  
Tissue Motion

A Six-Degree-of-Freedom Acoustic Transducer for Rotation and Translation Measurements Across the Knee

1990 ◽  
Vol 112 (4) ◽  
pp. 371-378 ◽  
Author(s):  
T. P. Quinn ◽  
C. D. Mote
Keyword(s):  
Soft Tissue ◽  
External Rotation ◽  
Worst Case ◽  
Mechanical Coupling ◽  
Acoustic Transducer ◽  
Transducer Design ◽  
Cadaver Specimen ◽  
Soft Tissue Motion ◽  
Tissue Motion

An acoustic transducer design to measure the relative translations and rotations across the knee with no mechanical coupling between the tibia and femur is presented. Platforms attached to femoral and tibial tracking fixtures hold acoustic sources and receivers, respectively. The distance from each source to each receiver is measured by the acoustic transit time and the translations and rotations across the knee joint are computed. For rotations less than 30 deg around the expected operating position, the resolution of the transducer is 0.3 deg; for translations less than 1.5 cm around the expected operating position, the resolution is 0.03 cm. Theoretical error analysis using a Monte Carlo method shows that the uncertainty in the measurement depends on the relative position of the sources and receivers. The analysis predicts the worst case resolution of the transducer as 0.09 cm in translation and 0.6 deg in rotation when the receiver platform is translated 8.0 cm parallel to the source platform. The transducer and fixturing system are demonstrated on a cadaver specimen for applied anterior force and applied internal-external rotation. Errors due to (soft tissue) motion of the transducer relative to the bone during in vivo measurements are assessed on the cadaver specimen. For internal-external rotation the error due to soft tissue motion is a maximum of 0.5 cm in translation and 1.8 deg in rotation. For applied anterior force the error due to soft tissue motion is a maximum of 0.16 cm in translation and 2.7 deg in rotation.

scholarly journals Soft Tissue Motion Influences Skeletal Loads During Impacts

2008 ◽  
Vol 36 (2) ◽  
pp. 71-75 ◽  
Author(s):  
John H. Challis ◽  
Matthew T.G. Pain
Keyword(s):  
Soft Tissue ◽  
Soft Tissue Motion ◽  
Tissue Motion

scholarly journals Soft Tissue Motion during Impacts: Their Potential Contributions to Energy Dissipation

2002 ◽  
Vol 18 (3) ◽  
pp. 231-242 ◽  
Author(s):  
Matthew T.G. Pain ◽  
John H. Challis
Keyword(s):  
Soft Tissue ◽  
Muscle Tension ◽  
Force Plate ◽  
Soft Tissue Deformation ◽  
Skin Marker ◽  
Frequency Components ◽  
Distinct Frequency ◽  
Soft Tissue Motion ◽  
Kinetics Of ◽  
Tissue Motion

The aims of this study were to quantify intrasegmental motion using an array of 28 surface-mounted markers to examine frequency and amplitude measurements of the intrasegmental motion to calculate forces and energy transfer; and to show that the underlying muscles are a major contributor to the skin marker motion. One participant performed 27 trials under three conditions in which his forearm was struck against a solid object fixed to a force plate while the locations of the markers were recorded at 240 Hz. For impacts with equal peak forces, the muscle tension significantly affected the amount of intrasegmental motion. Tensing the arm reduced the intrasegmental motion by 50%. The quadrilateral sectors defined by the markers changed in area by 11% with approximately equal motion in the vertical and horizontal direction. The maximum linear marker motion was 1.7 cm. The intrasegmental motion had distinct frequency components around 14 and 20 Hz. Soft tissue deformation could account for 70% of the energy lost from the forearm during these impacts. The study has demonstrated the important role that intrasegment soft tissue motion can have on the kinetics of an impact.

A Quasi-Spherical Triangle-Based Approach for Efficient 3-D Soft-Tissue Motion Tracking

2013 ◽  
Vol 18 (5) ◽  
pp. 1472-1484 ◽  
Author(s):  
Wai-Keung Wong ◽  
Bo Yang ◽  
Chao Liu ◽  
Philippe Poignet
Keyword(s):  
Soft Tissue ◽  
Motion Tracking ◽  
Spherical Triangle ◽  
Soft Tissue Motion ◽  
Tissue Motion

scholarly journals Improved image quality in subtraction based non-contrast MRA using automated soft tissue motion correction with BRACE

2009 ◽  
Vol 11 (S1) ◽  
Author(s):  
Zhaoyang Fan ◽  
Peter Weale ◽  
Xiaoming Bi ◽  
James Carr ◽  
Saurabh Shah ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Image Quality ◽  
Motion Correction ◽  
Soft Tissue Motion ◽  
Tissue Motion
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