ZMT zurich med tech

@daolin_qu From the image you posted, I see that you haven't yet load the model, that's why you cannot run yet a simulation. You can do that by clicking on the 'Load Model' icon in the top panel. After that, you can assign sensors and run the simulation. The 'Load Model' initiates the discretization of the axon trajectory into compartments (electric circuits describing the electrophysiology of the specified axon model, i.e. SENN).

Scaling method ref. Furse C M and Gandhi O P1998 "Calculation of Electric Fields andCurrents Induced in a Millimeter-Resolution Human Model at 60 Hz Using the FDTD Method" Bioelectromagnetics 19:293–299 (1998)

Note for MRIxViP we align the models by moving them such that the origin is the projection (closest point) of the saddle point between nose and frontal sinus, to the plane through the ear canal (perpendicular to view direction) [image: 1641456564489-e42eb832-2116-4b1b-abcc-3a2075799c6d-image.png]

I am not sure to be honest why that was an issue for me with that specific version only, I installed the new version and it was there so problem solved!

@rose see my answer here

So definitely max gain it is not useful for my purposes. I wanna construct a more symmetrical radiation pattern and maximize the gain in a certain direction. And of course, I would like to know which parameters I should set up to get such purposes.

@gbgbha you are right.thanks you very much.

thank you, @bryn, for the tip!

Ok, we could set up a call for this ... The Mida model won't really work since it's based on MRI images which doesn't have good contrast for Bone. The typical approach utilizes CT images (known acoustic property maps use CT data as well)

I am using Sim4Life 6.2.1.4972. It happened once when I've had put a high "maximum number of samples" in the time domain (200 I think) with the acoustic head tutorial that I changed a bit, by putting 2 transducers instead of 1. Another time it was weird because it happened with a SEFT targeting a square of skin, which was rather simple but it did crash again. My simulation was probably wrong in a way, but it didn't throw and error and just stopped. But now that I am applying @gbgbha advices, it is fine :) and thanks for the tip ! I'll try for the file that I lost

Thanks @montanaro!

@montanaro That would be of great help. Thank you so much Annalisa

Don't worry about the time step, just make sure it's fine enough, Sim4Life will then interpolate your function into it's own timestep as needed (so, you just need to be careful that your timestep is not too coarse such that Sim4Life won't be able to linearly (I think) interpolate it Essentially, the answer is yes, its sufficient

Mesh_material = sim.AddMaterialSettings(themesh(fromstl)) Mesh_material.Name = yourname Mesh_material.ElectricProps.Conductivity = v # S/m

Thank you Ofli for your quick response. That was very helpful!

can you supply some code example ? thanks

License issue?

@MSJ the modify button is probably hidden on the top right, if you click the triangle where you see the three dots (...).

This is windows configuartion related issue. You might not have access to log counter data, try logging in as an administrator. Later you can add user to the Performance Logs User Group. Look at this page for more details: https://learn.microsoft.com/en-us/windows/win32/perfctrs/limited-user-access-support

@brown Thank you, I will check these things. Additionally, there are some warning messages which may help: [image: 1714906840653-7427af6d-b388-4d9a-b629-2678e1872293-image-resized.png] Is the mesh division not precise enough？