OptiTrack Biomech (57) Marker Set

From Software Product Documentation
Jump to navigation Jump to search
Language:  English  • français • italiano • português • español 

Introduction

This tutorial explains how to implement OptiTracks Biomech (57) full body marker set[1]. This full body marker set includes the head, torso, upper and lower body, hands and feet.

The naming convention used in this tutorial follows Serge Van Sint Jan's convention[2].

Target Placement


LAH/RAH: Left/Right anterior head
LPH/RPH: Left/Right posterior head
SJN (IJ): Deepest point of incisura jugularis
SXS (PX): Xiphoid process, i.e. most caudal point of the sternum
CV7 (C7): Spinous process of the seventh cervical vertebrae
TV2 (T2): Second thoracic vertebrae
TV7 (MAI): Midpoint between the inferior angles of the most caudal points of the two scapulae
LHGT/RHGT: Left/Right glenohumeral Joint
LIAS/RIAS (LASIS/RASIS): Left/Right anterior superior iliac spine
LIPS/RIPS (LPSIS/RPSIS): Left/Right posterior superior iliac spine
LCAJ/RCAJ (LA/RA): Left/Right acromion
LHLE/RHLE: Left/Right humerus lateral epicondyle
LHME/RHME: Left/Right medial lateral epicondyle
LUA/RUA: Left/Right upper arm
LHM2/RHM: Left/Right hand second metatarsal
LUSP/RUSP: Left/Right ulna styloid process
LRSP/RRSP: Left/Right radius styloid process
LFTC/RFTC (LGT/RGT): Most lateral prominence of the greater trochanter
LFLE/RFLE (LLE/RLE): Most lateral prominence of the lateral femoral epicondyle
LFME/RFME (LME/RME): Most medial prominence of the medial femoral epicondyle
LTH/FTH: Left/Right thigh
LSK/RSK: Left/Right Superior knee
LTTC/RTTC (TT/RTT): Most anterior border of the tibial tuberosity
LFAX/RFAX (LHF/RHF): Proximal tip of the head of the fibula
LFAL/RFAL (LLM/RLM): Lateral prominence of the lateral malleolus
LTAM/RTAM (LMM/RMM): Most medial prominence of the medial malleolus
LFM5/RFM5 (LVM/RVM): Dorsal margin of the fifth metatarsal head
LFM1/RFM1 (LFM/RFM): Dorsal margin of the first metatarsal head
LFM2/RFM2 (LSM/RSM): Dorsal aspect of the second metatarsal head
LFCC/RFCC (LCA/RCA): Aspect of the achilles tendon insertion on the calcaneous
LDP1/RDP1: Left/Right distal phalanx

Segment Definition

Head Segment

Head Landmarks

1. Create Head_Front:

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: Head_Front

       Landmark Name: Head_Front
       Define Orientation Using:
       Starting Point: RAH
       Ending Point LAH
  4. Offset Using the Following AXIAL Offset: 0.5
  5. Check: Offset by Percent (1.0 = 100%)
  6. Check: Calibration Only Landmark

caption

2. Create HEAD_PROXIMAL:

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: HEAD_PROXIMAL

       Landmark Name: HEAD_PROXIMAL
       Define Orientation Using:
       Existing Coordinate System: Thorax/Ab
  4. Offset Using the Following AXIAL Offset: 1
  5. Check: Offset by Percent (1.0 = 100%)
  6. Check: Calibration Only Landmark

caption

3. Create HEAD_DISTAL:

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: HEAD_DISTAL

       Landmark Name: HEAD_DISTAL
       Define Orientation Using:
       Starting Point: Thorax_Prox
       Ending Point Thorax_Dist
       *Project From Head_Front
  4. Do NOT Check: Offset by Percent (1.0 = 100%)
  5. Do NOT Check: Calibration Only Landmark

caption

Head Definition

1. Create Head:

  1. In the Segments tab, select Head in the Segment Name box.
  2. Click on the Create Segment button.
  3. In the Head tab, enter these values:

       Define Proximal Joint and Radius
       Lateral: None     Joint: HEAD_PROXIMAL     Medial: None     
       Radius: 0.5*DISTANCE(RAH,LAH)

       Define Distal Joint and Radius
       Lateral: none     Joint: HEAD_DISTAL     Medial: none     
       Radius: 0.5*DISTANCE(RPH,LPH)

       Extra Target to Define Orientation: Posterior, Head_Front

       Select Tracking Targets:
         LAH, LPH, RAH, RPH
  4. Click on Build Model.
  5. Click on Close Tab before proceeding.

caption

2. Modify the Segment Coordinate System:

  1. Define the Segment Orientation as:

       A/P Axis: +Y
       Distal to Proximal: -Z

Thorax Segment

Thorax Landmarks

1. Create Thorax_Dist:

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: Thorax_Dist

       Landmark Name: Thorax_Dist
       Define Orientation Using:
       Starting Point: SXS
       Ending Point TV7
  4. Offset Using the Following AXIAL Offset: 0.5
  5. Check: Offset by Percent (1.0 = 100%)
  6. Check: Calibration Only Landmark

caption

2. Create Thorax_Prox:

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: Thorax_Prox

       Landmark Name: Thorax_Prox
       Define Orientation Using:
       Starting Point: SJN
       Ending Point CV7
  4. Offset Using the Following AXIAL Offset: 0.5
  5. Check: Offset by Percent (1.0 = 100%)
  6. Check: Calibration Only Landmark

caption

3. Create Thorax_AP:

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: Thorax_AP

       Landmark Name: Thorax_AP
       Define Orientation Using:
       Starting Point: SJN
       Ending Point SXS
  4. Offset Using the Following AXIAL Offset: 0.5
  5. Check: Offset by Percent (1.0 = 100%)
  6. Check: Calibration Only Landmark

caption

Thorax Definition

1. Create Thorax/Ab:

  1. In the Segments tab, select Thorax/Ab in the Segment Name box.
  2. Click on the Create Segment button.
  3. In the Thorax/Ab tab, enter these values:

       Define Proximal Joint and Radius
       Lateral: None     Joint: Thorax_Dist     Medial: None     
       Radius: 0.5*DISTANCE(RCAJ,LCAJ)

       Define Distal Joint and Radius
       Lateral: none     Joint: Thorax_Prox     Medial: none     
       Radius: 0.5*DISTANCE(RCAJ,LCAJ)

       Extra Target to Define Orientation: Posterior, Thorax_AP

       Select Tracking Targets:
         CV7, SJN, SXS, TV7

       Depth: 0.5*DISTANCE(CV7,SJN)
  4. Click on Build Model.
  5. Click on Close Tab before proceeding.

caption

2. Modify the Segment Coordinate System:

  1. Define the Segment Orientation as:

       A/P Axis: +Y
       Distal to Proximal: -Z

Upper Arm Segment

Upper Arm Landmarks

1. Create LSJC Joint Center:

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: LSJC

       Landmark Name: LSJC
       Define Orientation Using:
       Starting Point: LCAJ
       Exisiting Coordinate System: Thorax/Ab
  4. Offset Using the Following AXIAL Offset: -(LShoulderRadius+MarkerRadius)
  5. Do NOT Check: Offset by Percent (1.0 = 100%)
  6. Check: Calibration Only Landmark

caption

Upper Arm Definition

1. Create Left Forearm:

  1. In the Segments tab, select Left Upper Arm in the Segment Name box.
  2. Click on the Create Segment button.
  3. In the Upper arm tab, enter these values:

       Define Proximal Joint and Radius
       Lateral: None     Joint: LSJC     Medial: None     
       Radius: LShoulderRadius

       Define Distal Joint and Radius
       Lateral: LHLE     Joint: None     Medial: LHME     

       Select Tracking Targets:
         LHLE, LHME, LUA,
  4. Click on Build Model.
  5. Click on Close Tab before proceeding.

caption

2. Modify the Segment Coordinate System:

  1. Define the Segment Orientation as:

       A/P Axis: +Y
       Distal to Proximal: +Z

Forearm Segment

Forearm Landmarks

1. Create LT_ELBOW Joint Center:

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: LT_ELBOW

       Landmark Name: LT_ELBOW

       Define Orientation Using:
       Exisiting Coordinate System: Left Upper Arm
  4. Offset Using the Following AXIAL Offset: -1.0
  5. Check: Offset by Percent (1.0 = 100%)
  6. Do NOT Check: Calibration Only Landmark

caption

Forearm Definition

1. Create Left Forearm:

  1. In the Segments tab, select Left Forearm in the Segment Name box.
  2. Click on the Create Segment button.
  3. In the Left Forearm tab, enter these values:

       Define Proximal Joint and Radius
       Lateral: None     Joint: LT_ELBOW     Medial: None     
       Radius: 0.0548641

       Define Distal Joint and Radius
       Lateral: LRSP     Joint: None     Medial: LUSP     

       Select Tracking Targets:
         Use Calibration Targets for Tracking
  4. Click on Build Model.
  5. Click on Close Tab before proceeding.

caption

2. Modify the Segment Coordinate System:

  1. Define the Segment Orientation as:

       A/P Axis: +Y
       Distal to Proximal: +Z

Hand Segment

Hand Landmarks

1. Create LWJC Joint Center

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: LWJC

       Landmark Name: RANK

       Define Orientation Using:
       Starting Point: LRSP
       Ending Point: LUSP
  4. Offset Using the Following ML/AP/AXIAL Offsets:
  5. X: 0.0 Y: 0.0 Z: 0.5
  6. Check: Offset by Percent (1.0 = 100%)
  7. Do NOT Check: Calibration Only Landmark

caption

2. Create LHJC Joint Center

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: LHJC

       Landmark Name: RANK

       Define Orientation Using:
       Starting Point: LT_ELBOW
       Ending Point: LWJC
       *Project From: LHM2
  4. Offset Using the Following ML/AP/AXIAL Offsets:
  5. X: 0.0 Y: 0.0 Z: 0.0
  6. Do NOT Check: Offset by Percent (1.0 = 100%)
  7. Check: Calibration Only Landmark

caption

Hand Definition

1. Create Left Hand:

  1. In the Segments tab, select Left Hand in the Segment Name box.
  2. Click on the Create Segment button.
  3. In the Left Hand tab, enter these values:

       Define Proximal Joint and Radius
       Lateral: None     Joint: LWJC     Medial: None     
       Radius: LWristRadius

       Define Distal Joint and Radius
       Lateral: none     Joint: LHJC     Medial: none     

       Select Tracking Targets:
         LHM2, LRSP, LUSP
  4. Click on Build Model.
  5. Click on Close Tab before proceeding.

caption

2. Modify the Segment Coordinate System:

  1. Define the Segment Orientation as:

       A/P Axis: +Y
       Distal to Proximal: +Z

Pelvis Segment

Pelvis Definition

1. Create Pelvis Segment:

  1. In the Segments tab, select Pelvis in the Segment Name box.
  2. In Segment Type, select V3D_Composite
  3. Click on the Create Segment button.
  4. In the Pelvis dialog:

       Define Calibration Targets
       R.ASIS: RIAS
       L.ASIS: LIAS
       R.PSIS: RIPS
       L.PSIS: LIPS

       Check Use Calibration Targets for Tracking
  5. Click on Build Model.
  6. Click on Close Tab before proceeding.

caption


2. Modify the Segment Coordinate System:

  1. Define the Segment Orientation as:

       A/P Axis: +Y
       Distal to Proximal: +Z

Thigh Segment

Thigh Landmarks

1. Create LEFT_HIP Joint Center:

  1. Click Landmarks button
  2. Click Add New Landmark button
  3. Create Landmark: LEFT_HIP

       Landmark Name: LEFT_HIP

       Define Orientation Using:
       Existing Coordinate System Pelvis
  4. Landmark Offset from Start Point or Segment Origin
  5. ML: -0.36*ASIS_Distance*RPV_ML_Direction
  6. AP: 0.19*SASIS_Distance*RPV_AP_Direction+0.5*:RPV_Depth - Target_Radius_ASIS
  7. AXIAL: -0.30*ASIS_Distance*RPV_Axial_Direction
  8. Do NOT Check: Offset by Percent (1.0 = 100%)
  9. Do NOT Check: Calibration Only Landmark

caption

Thigh Definition

1. Create Left Thigh:

  1. In the Segments tab, select Left Thigh in the Segment Name box.
  2. Click on the Create Segment button.
  3. In the Left Thigh tab, enter these values:

       Define Proximal Joint and Radius
       Lateral: None     Joint: LEFT_HIP     Medial: None     
       Radius: 0.5*DISTANCE(RIGHT_HIP,LEFT_HIP)

       Define Distal Joint and Radius
       Lateral: LFLE     Joint: None     Medial: LFME     

       Select Tracking Targets:
         LEFT_HIP, LFLE, LFME, LFTC, LTH
  4. Click on Build Model.
  5. Click on Close Tab before proceeding.

caption

2. Modify the Segment Coordinate System:

  1. Define the Segment Orientation as:

       A/P Axis: +Y
       Distal to Proximal: +Z

Shank Segment

Shank Definition

1. Create Left Shank:

  1. In the Segments tab, select Left Shank in the Segment Name box.
  2. Click on the Create Segment button.
  3. In the Left Shank tab, enter these values:

       Define Proximal Joint and Radius
       Lateral: LFLE     Joint: none     Medial: LFME     

       Define Distal Joint and Radius
       Lateral: LFAL     Joint: None     Medial: LTAM     

       Select Tracking Targets:
         LFAL, LFAX, LTAM, LTTC
  4. Click on Build Model.
  5. Click on Close Tab before proceeding.

caption

2. Modify the Segment Coordinate System:

  1. Define the Segment Orientation as:

       A/P Axis: +Y
       Distal to Proximal: +Z

Foot Segment

Foot Definition

1. Create Left Foot:

  1. In the Segments tab, select Left Foot in the Segment Name box.
  2. Click on the Create Segment button.
  3. In the Left Foot tab, enter these values:

       Define Proximal Joint and Radius
       Lateral: LFAL     Joint: none     Medial: LTAM     

       Define Distal Joint and Radius
       Lateral: LFM5     Joint: None     Medial: LFM1     

       Select Tracking Targets:
         LDP1, LFCC, LFM1, LFM2, LFM5
  4. Click on Build Model.
  5. Click on Close Tab before proceeding.

caption

2. Modify the Segment Coordinate System:

  1. Define the Segment Orientation as:

       A/P Axis: +Y
       Distal to Proximal: +Z

References

  1. ↑ OptiTrack Biomech(57) https://docs.optitrack.com/movement-sciences/movement-sciences-markersets/biomech-57
  2. ↑ Serge van Sint Jan "Color Atlas of Skeletal Landmark Definitions: Guidelines for Reproducible Manual and Virtual Palpations" 2007 - Churchill Livingstone
Retrieved from ""