• RecurringMeetings
• 2016-01-12

Recurring Meeting of Cleveland Clinic Core Team

Date: January 12, 2016

Time: 2:00 PM EST

Means: In person meeting

Attendees:

1. Ahmet Erdemir
2. Tammy Owings
3. Benjamin Landis

Agenda:

1. Discuss immediate action items from past meetings.

   • http://wiki.simtk.org/multis/RecurringMeetings/2016-01-05-1400

2. Design of ultrasound probe / force transducer handle.
3. Decide immediate action items for next meeting.
4. Other.

Immediate Action Items:

• Ahmet
  • Start working on the design of ultrasound probe - force transducer attachment.
• Tammy
  • Follow up with physicians for training on musculoskeletal imaging using ultrasound.
  • Start accumulating a list of articles on the wiki for tissue thickness measurements using ultrasound.
• Ben
  • Provide comparative measurements of ultrasound probes in the in-house data management system.
• Ben and Ahmet
  • Meet to go over simplified contact model and a simplified leg model. (FEBio)
• Robb
  • Document surgical tools and their handling on the wiki with photos.
  • Start working on cabling and signal generation to synchronize ultrasound imaging and force measurements.
• Tara
  • Update force collection interface to report maximum shear and normal forces during use of ultrasound probe.

Notes:

1. Discuss immediate action items from last meeting.
   • Tammy will wait to contact physicians to make sure everyone comes back from vacation. She made a presentation to show sample ultrasound images for different body segments and when using different probes. She is working on marking some of the images, i.e. to identify tissue boundaries, for discussions with musculoskeletal imaging physician and technician.
   • Ben met with Robb and Ahmet to go over the three-dimensional scans of ultrasound probes. The scans seem to be appropriate for geometric modeling. Ben also scanned the ultrasound probe 18L6. He uploaded the STL surfaces in the in-house data management system. He compared measurements of probe dimensions using callipers with those obtained from STL surfaces. Measurements appear to agree. He will upload a spreadsheet to the in-house data management system as reference.
   • Ben has developed a working model of curved indenter compressing a box using FEBio. He tried a cylindrical object, i.e., similar to a section of a leg. He is troubleshooting this model and will meet with Ahmet in this regard. Ben wants to get models converge first before deciding upon geometric and material properties to use in simplified abstraction of a musculoskeletal extremity. Ahmet mentioned that once we get such a model running in FEBio, we will work on implementing it in SOFA to compare predictive capacity and computation cost.

   • Robb and Tara were not able to attend the meeting due to scheduled experimentation in the BioRobotics Core. Their action items from the last meeting remain.

2. Design of ultrasound probe / force transducer handle.
   • Ahmet showed the scan of the ultrasound probe 9L4 and the geometry of the force transducer to discuss design aspects of a fixture to connect these and to hold during experimentation. He virtually placed the force transducer at an approximate position and described an initial design. In between the force transducer and the ultrasound probe, two pieces may need to be built. One, which is conforming to the ultrasound probe, can be manufactured using 3D printing based on probe scans. This piece can slide over the probe and can be clamped at two locations. An extension piece can be clipped and tightened on a second piece which is affixed to the force transducer. A third piece will be affixed to the other end of the force transducer. With an L-bracket, it can be extended to the ultrasound probe tip and wrap around it (without touching the other fixtures) for handling the whole assembly during tests.
3. Decide immediate action items for next meeting.
   • See Immediate Action Items above.
4. Other.

   • Tammy conducted a quick search on PubMed on comparison of thickness measurements using ultrasound and MRI. She noted a study indicating that for muscle, the measurements are correlated. She will accumulate a list of these articles in the wiki, with links to their PubMed entry.