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VICON NEXUS

VICON NEXUS. General Outline Turn on Hardware Opening Software Camera Calibration Set Volume Origin Vicon Prep Subject Set-Up Part 1: Elastic Straps Part 2: Extremity Markers Part 3: Spine Markers Part 4: Other Markers Part 5: Joint Markers Part 6: EMG Set-Up & More Vicon Set-Up

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VICON NEXUS

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  1. VICON NEXUS

  2. General Outline • Turn on Hardware • Opening Software • Camera Calibration • Set Volume Origin • Vicon Prep • Subject Set-Up • Part 1: Elastic Straps • Part 2: Extremity Markers • Part 3: Spine Markers • Part 4: Other Markers • Part 5: Joint Markers • Part 6: EMG Set-Up & More • Vicon Set-Up • Create subject file/session • Load subject • Check Analog Signals in Vicon • Collect static trial • Re-construct file • Label Markers • Save • Remove joint markers for subsequent trials • 8. Data Collection

  3. Step One: Turn on Hardware • This includes but is not limited to: • Vicon • Switch on back left • Should be turned on before software is opened • EMG (will use one or the other) • Delsys • Switch on front right • BIOPAC • Button on back left • Force Plates • 2 small stacked boxes labeled Bertec • Green lights indicate on • Load Cells

  4. Step Two: Opening Software • Once Vicon Hardware is powered on, open Vicon Software found on desktop

  5. Step Three: Camera Calibration • Calibration is most effective with two people • View the “System” tab in the left side of the main screen • Select the “System Preparation” button on the right side of the screen in the Tools area • Choose 5-marker wand and L-Frame under the 2 pull down menus • Have one person stand by area of force plates with the calibration wand • The other person should hit “start” under the “calibrate MX cameras” subheading. • After “start” is clicked, the person with the wand should move the wand around the entire volume making sure to turn around so that all cameras can view the wand. • As a camera is completed, it will turn green. Process ends when all cameras are green in Vicon. • Once this is complete, wait for the system to finish calibration (System Preparation) (System)

  6. Step Four: Set Volume Origin • Grab the T-wand and place it on the right corner of the left force plate • Click “Start” under the “Set Volume Origin” subheading as seen on left, and then hit it again to set volume origin

  7. Step Five: Vicon Prep • Select appropriate system file: • Found under the “system” tab on the left side of the main screen. This differs with experiments. (System)

  8. 2. Check Camera Views: • Hide all reflective markers, including the wand used in camera calibration • WindowNew Floating Workspace (Picture one), results in picture two • Under the 3D Perspective tab on top left, select “Camera” (Shown in picture two) • Select the cameras (one at a time or hold Control key to select all cameras) • To do this, expand the Cameras sub-heading under the “System” tab as shown in picture three. • Picture four shows results of selecting all seven cameras • If there are white dots in camera field boxes, this indicates the presence of reflective markers or objects that reflective components that the cameras are picking up. Move markers and/or reflective objects out of camera viewing area. (Picture Two) (Picture One) (Picture Four) (Picture Three)

  9. Step Six: Subject Set-Up Part 1: Elastic Straps Part 2: Extremity Markers Part 3: Spine Markers Part 4: Other Markers Part 5: Joint Markers Part 6: EMG Set-Up

  10. Part 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

  11. 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 Part 2: Extremity Markers

  12. TspineHigh TspineRightHigh • High=spine of scapula • Low= just above inferior angle • Use shape similar to left TspineLow TspineRightLow LumbarHigh LumbarRightHigh • Use white “Low Thoracic” template to guide proper marker placement/shape. Use double-sided tape to connect markers on subject’s back. T9/10 level for top row, and T12/L1 level for bottom. 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 Part 3: Spine Markers

  13. Part 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

  14. Part 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)

  15. Part 6: EMG Set-Up & More • Follow EMG Set-Up as outlined in EMG section of Lab Manual. • Note that different experiments will record from different muscle sites. • Experiments differ in other forms of set-up. Follow specific experiment protocol for other set-up needs.

  16. Step Seven: 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 • Load Subject: • 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)

  17. Check All Analog Signals: • Window New Workspace (as done before during Vicon Prep) • Under the 3D perspective pull down menu, select “Graph” (picture one) • Under the system tab on left, select various EMG channels, load cells, fork sensors, etc. to make sure all equipment is working (picture two) • Apply manual force to subject to check activity of EMG channels • Picture three shows sampling of an EMG channel in the graph workspace (Picture One) (Picture Two) (Picture Three)

  18. Collect Static Trial & Re-construct • 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)

  19. Labeling Markers: • 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)

  20. 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.

  21. Step Eight: Data Collection (Capture) • 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. (Arm)

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