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VICON NEXUS PowerPoint Presentation
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VICON NEXUS

VICON NEXUS

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VICON NEXUS

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  1. VICON NEXUS

  2. Step 1: Elastic Straps • General Information • Elastic straps are arranged on wall by body region and by size in subject set-up area • The straps are used to secure extremity marker plates • Although the straps should be near the middle of the body segment, the left and right sides should be slightly different levels to prevent the camera from being confused • Select straps that are tight but comfortable in order to prevent the strap from sliding during the experiment. • Upper Extremity • Left and Right mid-humerus • Left and Right mid-forearm • Lower Extremity • Left and Right mid-thigh (Use an upper and lower strap) • Left and Right mid-shank • Sacrum • Use blue foam belt and secure tightly around sacrum, just below the ASIS

  3. Left LUpperArmHighFront LUpperArmHighBack LUpperArmLowFront LUpperArmLowBack • Apply the extremity plates to the Velcro /elastic straps • Same concept for right side. Only difference in marker identification in Vicon is that labels start with “R” instead of “L” • Use this picture to help in labeling markers in Vicon LLowerArmHighFront LLowerArmHighBack LLowerArmLowFront LLowerArmLowBack LThighHighFront LThighHighBack LThighLowFront LThighLowBack LShankHighFront LShankHighBack LShankLowFront LShankLowBack Step 2: Extremity Markers

  4. TspineHigh TspineRightHigh • Not sure?? TspineLow TspineRightLow LumbarHigh LumbarRightHigh • Use white “Low Thoracic” template to guide proper marker placement. Use double-sided tape to connect markers on subject’s back. Levels?? LumbarRightLow LumbarLow PelvisHigh PelvisRightHigh • Use rectangular plate as seen in picture. Top row of markers should be aligned over the L5/S1 joint segment. PelvisLow PelvisRightLow Step 3: Spine Markers

  5. Step 4: Other Markers HeadRBack HeadLBack HeadRFront HeadLFront Rfootprox • Use green OU hat that has • 4 markers on it. Above is a • top view of hat markers. RfootSide Rtoe • Blue sandals already have markers attached. Can use this to help label in Vicon. LFinger • Apply finger markers to left and right index fingers as seen in picture on left. Rfinger

  6. Step 5: Joint Line Markers • Use double-sided tape to attach reflective markers to the following: • Upper Extremity: • Left and Right, anterior and posterior GH (Shoulder) • Left and Right, medial and lateral humeral epicondyles (Elbow) • Left and Right, radial and ulnarstyloid processes (Wrist) • Lower Extremity: • Left and Right Greater Trochanters (Hip) • Left and Right, medial and lateral femoral condyles (Knee) • Left and Right, medial and lateral malleoli (Ankle) • **These markers are left on for the calibration trial only!

  7. Step 6: Vicon Set-Up • Create the subject and session: • File data management • Right click on study (training if practicing)NewPatient • Right clickrename • Name subject according to 3 initials and 6 digit birthday with “_con” at end • Right click on subject’s name New Session • Subject Set-up: • In the left column on main screen, select the “subjects” tab (as compared to systems) • Select the button “create a new subject from a template” • Select the “ClusterOU2007_New” • Enter the same subject file name that was created in the data management page (Shortcut for data management) (Subject’s Tab)

  8. Creating Subject Model: • On the right side of the main screen, click on the subject preparation button (looks like a person) • Under the Subject Calibration subheading, select reconstruct • Make sure you are in Live mode • Instruct subject to look straight ahead, and flex shoulders to 80 degrees with thumbs pointing up • Make sure all sensors are visible, readjust sensors on the subject if they are not • Instruct subject to not move • Under the Subject Capture subheading, click start to record data, click stop after about 1-2 seconds of collection. • Select the grey re-construct button for the trial to appear (found in top row of buttons) (Re-construct) (Live) (Subject Preparation)

  9. Labeling Subject Model: • On the right side of the main screen, select “Label/Edit” button. It looks like a tag. • Click on first marker name from list on right (Pelvis High) • Click on corresponding marker • Use previously labeled pictures to help correctly label markers • Vicon will cue you as to which marker you should label next, so you don’t have to click on the list on the right again • If you label a marker wrong, click Control-Z for edit undo function. Do that until you get rid of all mistakes. • After all markers are assigned, press the Escape button on the keyboard which will allow Vicon to connect the markers • When finished, click on save shortcut button • Remove all joint markers in the extremities for subsequent trials • Helpful Reminders: • Joint marker names are based on anatomical position • During calibration trial, subject has shoulders flexed to 80 degrees with thumbs up • Shoulder back is more posterior • Shoulder front is more anterior • Elbow lat is higher • Elbow mid is lower • Wrist Rad is higher • Wrist ulna is lower (Label/Edit) (Save)

  10. Picture above shows all markers used all subsequent trials. Notice how joint markers have been removed. This is accomplished by simply physically removing joint markers off subject after calibration trial completed. • Picture above shows all markers used for calibration trial. White markers are the joint markers that are removed after calibration. Includes bilateral wrist, elbow, shoulder, hip, knee, and ankle markers.

  11. Data Collection: • On the right side of the main screen, select the “capture” button. It looks like a director’s board. • Vicon must be in Live • Don’t start collecting data until model is attached. Sometimes if you have the subject wiggle the model will attach again. • Under the Auto Capture Setup subheading; select “Arm” to arm the trigger • You can now use the handheld trigger to collect data. • Data collection duration and other specific settings may vary depending on specific protocol. (Capture) (Arm)

  12. General Outline • Turn on all hardware • Vicon Nexus (switch on back) • Must turn on before software opened • EMG- either Delsys box or BIOPAC • Etc. • 2. Are you using EMG, force plates, or load cells? • if so, make sure all have power! • 3. Start Nexus software • 4. Check system file as picture on right, load appropriate file • 5. Check camera views • 6. Camera calibration • 7. Set volume origin • 8. Set-up subject • 9. Emg set up if needed • 10. Check analog signals • 11. Collect data!