ZMT zurich med tech

So my problem was solved for the simple phantom a sphere. It can be voxeled. I am having a discussion with chatgpt about how to load Duke into the simulation section because currently it wont be voxeled. Is there a simple few lines of code that loads Duke and all the default tissue electrical properties or is it necessary to assign each tissue type in a loop or via thousands lines of code (as I have seen elsewhere)....

After a call with S4L support, here is the solution for future reference: My machine had two GPUs connected, one of them old and deactivated. However, the script ExtractCudaInfo.py detected both of these in the line 'num_gpus = int(xml_root.find("attached_gpus").text)' and then got stuck trying to find information on the deactivated GPU. A quick fix for the issue is therefore to manually set the correct number, in my case 'num_gpus=1', in the script.

@Sylvain I exported the electric field results from an AC simulation and found that the last six columns of the data are imaginary numbers. Are these the electric field values in three different directions? Why aren't they time-varying? Did I only export the peak values?

Hi @bryn, I think you’re right. The issue appears to be related to the boundary conditions on the outer bounding box. I changed the boundary to a flux(0) condition, and that resolved the problem with the localized high field values at the extremities. Thank you!

That's helpful. Thank you for the detailed steps @bryn.

To measure the shortest distance between two entities, you can use the Python API: import XCoreModeling as xcm shell = xcm.GetActiveModel().SelectedEntities[0] coil = xcm.GetActiveModel().SelectedEntities[1] res = xcm.GetEntityEntityDistance(shell, coil) print(f"Shortest distance shell-coil: {res[0].Distance}") p1 = xcm.CreatePoint(res[0].ClosestPosition) p1.Name = "Point on Shell" p2 = xcm.CreatePoint(res[1].ClosestPosition) p2.Name = "Point on Coil" # This line is just to visualize where the measured distance was taken line = xcm.CreatePolyLine([res[0].ClosestPosition, res[1].ClosestPosition]) This would create something like this: [image: 1747752108672-c17b7bff-2d64-408c-88a7-fd83a4dadfdb-image.png] Some other snippets are shared here: https://forum.zmt.swiss/topic/565/geometry-modeling-snapping-to-endpoints-in-python-api/3?_=1747746585465

@brown Thank you for the suggestion. I can surface project object now.

Hi, Sorry to bother You. IN ATTACHED VIDEO SHOWS WHAT HAPPENS AFTER CLICKING THE OPTION "CREATE PLOT" AND THE SYSTEM CRASHES. The workstation and memory have been tested, all without errors. Can one of the service engineers help? Kind regards, Thank you, Andrei Andrei Churakov MD,PhD, Associate Professor of the Department of Electronic Engineering and Technology BSUIR E-mail: anchurakov@bsuir.by

This question is quite old. Maybe you found a solution? Otherwise I guess you could use one of these options: you can crop the field, e.g. via the bounding box (or the extent if you have an E-field on a rectilinear grid) you could use the interpolation filter: define your little box grids, and interpolate from the field sensor field to your box grids you could define small field sensors in the simulation setup (not sure it is scalable to hundreds of sensors)

Please give more context. E.g., "in the modeler when I use tool X", or in a "Y simulation" there is an option. or in this other thread (link) I asked about Z Then it will be easier to answer your question.

For the unstructured version of the EM LF Electro you would first need to generate a tetrahedral mesh. The mesh can be dragged onto such a simulation.

I would add that in the first approach you might change the tissue property of the original bladder to something else, e.g. fat, to get the desired effect of shrinking or stretching the bladder without creating air holes. Btw, you can measure the volume of a tissue surface in the modeler using the measure tool.

Are you able to run other NEURON tutorials (the pre-build versions)? If not then this issue could be related to the NEURON installation or version. It is possible that using an older version of the NEURON solver is causing the error you mentioned. Please make sure you have the correct version of NEURON installed in your Sim4Life folder. For instance, as you are using Sim4Life version 8.2.0.16876, you should download NEURON using NEURON_setup_8.2.0.16876.exe.

Did you do one of the following: • Define the FlexNet environment variable FLEXID_LIBRARY_PATH to point to the location of the dongle shared object, libhasp_linux_x86_64.so. • Define the system environment variable LD_LIBRARY_PATH to point to the location of the dongle shared object libhasp_linux_x86_64.so. ? Could you try to send us the output of lmhostid -flexid? that command should return the dongle id. You can also access the dongle firmware - if it is correctly installed - via the loopback address. On a browser, go to http://localhost:1947/ you should see the characteristics of the dongle. Let us know if it works.

Hi @parsley, Thank you for your feedback and for reporting the issue you experienced. The MATCH tool has already been successfully used/validated by many users and offers several useful features. For example, it allows users to add loading or matching circuits the S-matrix of a simulation and obtain updated scattering parameters without re‑running the full simulation. Have you experienced any problems with this particular workflow? From the information you provided, the issue appears to be related to only the Initial Matching function—the option that generates a matching circuit for a given S-matrix of a simulation at a chosen target frequency. In your case, you reported that it worked with the dipole antenna example but not with your specific antenna model. We would be happy to discuss the details so we can reproduce the problem and resolve it quickly. We will contact you to find out a convenient time to follow up. Thank you again for bringing this to our attention.

Hi, You would get that error if there was no simulation named "0_17_35_29" in the currently opened document. Maybe you should check what simulations you have in your project and if you do have a simulation with that name? One way to list all simulation names via python is to run something like: for s in document.AllSimulations: print(s.Name)

This looks like the drivers for the dongle are missing or have not been installed. Did you check the manual on how to install drivers for Linux? Also, it would help if you send us the full log. You can do that by emailing us at: s4l-support-group@zmt.swiss Regards, Guillermo

Hi gc00, Apologies for late response. Do you still have the issue you reported above?

@Sylvain Hi, thank you for your reply. I changed modulated field to El. Loss Density and everything works.

@halder When I performed TI simulation using the spherical model, I found that if I changed the current direction of one pair of electrodes, the maximum value of the TI Max (x, y, z) slice remained unchanged. Changing the current of one pair of electrodes should have shifted from the original same-direction superposition to a reverse weakening, so why does it remain unchanged? Is it because Max Modulation only uses EM for calculations?