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Projects

A folder with subfolders which includes a set of xml-files to describe what to do with a dataset (session, a set of trials, typcially with c3d-files) is called a „Project“. There are some projects specific for the Heidelber Motionlab.

PiGMo10 Vicon PiG based

This is a clone of what the PiGMo10 „modelscript“ in MoMo calculates, based on the Vicon PiG model.

So the complete pipeline from the raw data, to the sheets up to the exported hd-asc files, used by HeiDataProVIT, is possible and can substitute MoMo.

Extensive testing and finetuning is needed, to make the pipeline more robust for daily usage. Also some parameters MoMo saves in the hd-asc files are missed. It has to be checked if they are needed and if so determining of these parameters must be implemented.

The lower body kinematics angles of this project are described here.

PiGMo10 independent

Additional to the above this also includes a Vicon PiG kinematics clone. This makes the project completly independent from Vicon codebase, for full flexibility.

PiG with functional centers/axes

This project adds functional center/axes determination to the default Vicon PlugInGait model. It works together with the old Vicon Workstation and also with new Vicon Nexus system.

Additional to the SCoRE/SARA functional method implementation of Vicon, several mathematical methods are available and the phases, which are used as input for the estimation, can be controlled by setting of events in the dynamic calibration trials.

Eclipse entries

To process the data, specific dynamic calibration trials must be done and its specific eclipse entries must be set:

Name Value Description
CLASS Static_Cal Static standing trial, typically used with knee alignment device.
CLASS HipCircle Optional, if HipFlex/Ext and HipAbd/Add are both available.
CLASS HipFlex/Ext Flexion/Extention of the hip, which should cause also flexion/extention of the knee; last is used for knee-axis estimation; so it is important, that in this trial also the knee is flexed at minim of 30 degrees RoM.
CLASS HipAbd/Add Optional, if HipCircle and HipFlex/Ext are both available.
TYPE PiG, PiGFunctional Indicates, if the trial is processed with PiG or with functional-PiG (Vicon implementation of SARA and ScoRE).
SIDE Side R, Side L, bds

Modelparameter files

Modelparameter-files are needed to read parameters from clinical measurements, which are used to define offset angles in the kinematics model.

There is an important limitation in the mechanism to work with these files: You can have an mp-file only for each session and not for each group. That is why the mp-files are found only, if they are saved in the session and not in the group. Details of working with .mp-files and its limitations you can find here.

Used parameters are:

$LKneeWidth = 103 
$LAnkleWidth = 71
$LTibialTorsion = -15
$RKneeWidth = 104 
$RAnkleWidth = 71
$RTibialTorsion = -15

PiG with functional knee joint axes only

This project adds functional knee joint axes determination (SARA) only to the default Vicon PlugInGait model. It works together with the old Vicon Workstation system and allows to control the usage of the motion phases which are used for the estimation by setting of events.

In the gait trials the lateral knee markers are projected onto the functional knee joint axes and the knee joint center is determined based on the clinical measurement of the knee width. Than the femur coordinate system is constructed equivalent to the original PiG. Keep in mind that this coordinate system does not have the functional axis as one of its axes. The axes are defined by cross products and have the longitudinal femur axes included.

Preconditions

  • It is assumed, that the Vicon PiG is processed before processing with this model.
  • Additional markers on the theigh are needed. Have a look at the follwing markerset picture
  • Specific dynamic calibration movement with knee flexion, events to define the phases used by the estimation.
  • Specific eclipse entries. Have a look at the following table and screenshot

Markerset

Eclipse entries

To process the data, specific dynamic calibration trials must be available and its specific eclipse entries must be set:

Trial Name Value Description
1 CLASS Static_Cal Static standing trial with knee alignment device.
2 CLASS HipFlex/Ext Flexion/Extention of the hip, which should cause also flexion/extention of the knee; last is used for knee-axis estimation; so it is important, that in this trial also the knee is flexed at minimum of 30 degrees RoM.
all trials SIDE Side R, Side L, bds
3-n CLASS Dynamic or Dynamic+Kinetics Trial with gait, Strides defined by events.

Modelparameter files

Modelparameter-files are needed to read parameters from clinical measurements, which are used to define offset angles in the kinematics model.

There is an important limitation in the mechanism to work with these files: You can have an mp-file only for each session and not for each group. That is why the mp-files are found only, if they are saved in the session and not in the group. Details of working with .mp-files and its limitations you can find here.

Used parameters are:

$LKneeWidth = 103 
$RKneeWidth = 104 
projects.txt · Zuletzt geändert: 2022/11/26 04:17 von 161.97.135.248