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Nexus is the most powerful all-inclusive modeling and processing tool for movement analysis on the market. Created specifically for the whole life sciences community, Nexus delivers precise, repeatable data and clinically validated model outputs.
1. Open the Network and Sharing Center and navigate to Change Adapter Settings. Vicon Vantage/Vero cameras are designated to one port. For each Vue (or Bonita Video) camera connected, there will be additional network port used.
2. Right click on the proper port and go into the Properties. The Local Area Connection Properties window will open. Make sure only Internet Protocol Version 4 (TCP/IPv4) is selected.
If an NVIDIA processor is not available and Nexus stops responding, the following workaround may help. It involves installing an additional file to the Nexus program directory. To do this, you need read/write access to this location and may require the help of an administrator.
Nexus 2.13 is a point release for Vicon Nexus, which is a 64-bit only application. The update includes support for FLIR video cameras and the H.264 video codec. Before upgrading, please ensure your system remains compatible.
Nexus 2.12.1 is a patch release for Vicon Nexus, which includes an updated CGM2, Oxford Foot biomechanical models and also ProEclipse has been updated to 1.4.1. A number of reported issues have also been addressed since Nexus 2.12.
Nexus 2.11 is a point release for Vicon Nexus, which includes ProEclipse 1.4, enables high-speed camera mode for Vantage+, and adds improvements to camera calibration and performance for large camera systems. This release also includes updated Firmware Update Utility 1.3.2 and Vicon Video Viewer 1.7.0, and addresses issues reported since Nexus 2.10.3.
Please be aware that, to improve the performance of capturing and processing within Nexus, all future releases of the application will be 64-bit only. The OpenGL workaround for non-NVIDIA graphic processors (described below). If an NVIDIA processor is not available and you experience a software crash, the following workaround may help. It involves installing an additional file to the Nexus program directory. To do this, you need read/write access to this location and may require the help of an administrator.
IMU Improvements: To access new IMU frequency modes the Blue Thunder Sensor requires firmware 1.3. Users are required to update the Blue Thunder Sensor firmware using IMU Research app. This app is currently under review by Apple for release.
Link aggregation is used to describe various methods for using multiple parallel network connections to increase throughput beyond the limit that one link (one connection) can achieve. Link aggregation is supported in Tracker 1.3+, Nexus 1.8.5+, Blade 2+.
When setting up Link Aggregation ensure that you have the correct Network cards (Intel i340-T4 or the Intel i350-T4 cards) installed on your capture PC. Once you have the correct Network card(s) follow these steps:
When you add a force plate in Nexus, you are also required to install the Calibration File into the appropriate dialogue box. The Calibration file generally comes with the device from the manufacturer. This can be a .Plt file or an .acl file for AMTI plates.
Both versions generate a quintic spline using valid frames around the gap as seed data. The gap is filled using the interpolated values from the spline. If there are insufficient frames surrounding the gap, the fill is rejected.
Searches backwards and forwards from the gap looking for (Number of Gap Frames / 2) + 5 consecutive valid frames on each side, but will accept a minimum of 5 valid frames on either or both sides if the preferred range is not available. Searches the entire length of the clip looking for the valid frame ranges.
Generates linear interpolations between the valid frames either side of the gap and between the same frames in a donor trajectory. The interpolated value in the gap trajectory is then offset by the difference between the interpolated and true values in the donor trajectory. Mathematically:
Let F(t) be the value in the position of the trajectory to fill at frame t, and D(t) that of the donor trajectory. Let t0 and t1 be the valid frames before and after the gap, respectively. Then if we define the interpolated position V of trajectory Gat frame t as:
Takes a number of trajectories and assumes these move as a rigid body. The gaps in the selected trajectory are filled as if this trajectory is also a part of the same body. Manual filling is restricted to 3 donor trajectories and fills gaps in a single trajectory; the pipeline operation will use as many donor trajectories as possible, and will attempt to fill the gaps in each selected trajectory using all the other selected trajectories as donors.
Define the state at frame t as an (n x 3) matrix M(t) whose rows are the position vectors of the donor trajectories, P(t) as the position of the fill trajectory, and tx as a reference frame in which the positions of the donors and fill trajectory are all known.
Determines the fill based on the position and orientation of a segment. The manual operation operates on a single selected trajectory, while the pipeline operation attempts to fill gaps in all trajectories associated with the selected segment.
where R(t) is the rotation matrix defining the orientation of the segment in the world at frame t, O(t) is the origin position of the segment at frame t, and t0 and t1 are the valid frames before and after the gap, respectively.
Please Note: Expand force plate node to expose the Force, Moment and CoP (Center of Pressure) channels. A Green Arrow indicated a connected source device and a Yellow yield indicates that a channel has not been assigned a pin.
To do this click Show Trial Loading Options on the ProEclipse/Data Management toolbar at the top right of the ProEclipse/Data Management window. A new area will appear called Raw Data Loading Options
1. In order to select only required frames, in the Raw Data Loading Options area, select Load Range From and type the frame to start from in the first box and the end frame in the second box.
The required measurements for full body plug-in gait and lower body plug-in gait include mass, height, leg length, knee width, ankle width, shoulder offset, elbow width, wrist width, and hand thickness.
These measurements should all be entered in either kilograms or millimetres. All lengths or distances will be required in millimetres. The measurements for inter-ASIS distance, ASIS-trochanter distance, and tibial torsion are all optional entries. If they are not entered in, the model will calculate them.
Leg length: Measured from the ASIS to the medial malleolus. If a patient cannot straighten his/her legs, take the measurement in two pieces: ASIS to knee and knee to medial malleolus.
Shoulder offset: The vertical distance from the center of the glenohumeral joint to the marker on the acromion clavicular joint. Some researchers have used the (anterior/posterior girth)/2 to establish a guideline for the parameter.
Inter-ASIS distance: The model will calculate this distance based on the position of the LASI and RASI markers. If you are collecting data on an obese patient and cannot properly place the ASIS markers, place those markers laterally and preserve the vector direction and level of the ASIS. Palpate the LASI and RASI points and manually measure this distance, then input into the appropriate field.
ASIS-Trochanter distance: The perpendicular distance from the trochanter to the ASIS point. If this value is not entered, then a regression formula is used to calculate the hip joint center. If this value is entered, it will be factored into an equation which represents the hip joint center.
Thigh rotation offset: When a KAD is used, this value is calculated to account for the position of the thigh marker. By using the KAD, placement of the thigh marker in the plane of the hip joint center and the knee joint center is not crucial. Please note that if you do not use a KAD, this value will be reported as zero because the model is assuming that the thigh marker has been placed exactly in the plane of the hip joint center and the knee joint center. This value is calculated for you.
Shank rotation offset: Similar to the thigh rotation offset. This value is calculated in a KAD is present and removes the importance of placing the shank marker in the exact plane of the knee joint center and ankle joint center. If you do not use a KAD, these values will be zero. This value is calculated for you.
The first step in the shoulder modelling process is the definition of the shoulder, elbow and wrist centres and the Thorax, Clavicle and Humerus segments. The shoulder angle calculations are then based on YXZ Euler angle rotations between the Thorax and the Humerus Segments as follows:
In either of these positions the other two axes of rotation become aligned with one another, making it impossible to distinguish them from one another, a singularity occurs and the solution to the calculation of angles becomes unobtainable. For example, assume that the humerus is being rotated in relation to the thorax in the order Y,X,Z and that the rotation about the X-axis is 90 degrees. In such a situation, rotation in the Y-axis is performed first and correctly. The X-axis rotation also occurs correctly BUT rotates the Z axis onto the Y axis. Thus, any rotation in the Y-axis can also be interpreted as a rotation about the Z-axis.
The Distance Parameters are based in the marker position at the time, by default the toe marker (LTOE for left and RTOE for right) is used for the calculation. This can be changed in the Options box of the Generate Gait Cycle Parameters Pipeline Operation.
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