Analysis & Postprocessing

Postprocessing results

91 Topics 251 Posts
  • B1 rms field

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  • Export E-field due to each antenna

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  • 1 Votes
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    @halder Thank you for your response. I want the total current of 1 mA flowing between my two electrodes. In this case, I should put the target value as (1 mA/area of the plane I have drawn between two electrodes)?
    since my plane area is 182mm*220mm, then I should select the target value to be 0.024975 A/m2. Is this the correct approach?

  • Remove background from psSAR surface viewer

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  • Padding field with constant value

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  • Import modulation file

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    Really sorry, I honestly don't understand - I don't know what you mean with modulation and I'm not sure what you mean with using matlab and what input file you are exactly referring to. Maybe some screenshots will help, otherwise maybe contact support

  • Export large files to matlab

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    Hi,
    There is a file size limit with the MATLAB exporter but it will be improved. In the mean time, you might

    use a smaller field sensor than the overall field and try to limit the size of the field of view to the volume of interest only
    or export to Cache instead of MATLAB. This is an HDF5 file. You can use multiple libraries and functions in MATLAB to import an HDF5 file. This format can handle very large data files.
  • Magnetic induction power analysis

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  • Thermal

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  • Time Domain

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    Hi,

    Currently, there is no tool in Sim4Life allowing you to extract the S-parameter in time domain. You might evaluate it via Python scripting (using already available time-domain data of voltage and current at ports or inverse Fourier Transform). Sim4Life team is informed to include this request in the development plan and will inform you in the future once it is implemented.

  • 0 Votes
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    I've solved the issue. The sweep works if I set the source for the QS solver to a coil (wire current settings) instead of linking in that data from the SV solver (vector potential settings).

  • 0 Votes
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    Hi Vasilis,

    The Hyperthermia Optimizer and Template are licensed products that are not part of the Sim4Life light student version.

    Best,
    Habib

  • scalar product of two vector fields

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    Hi Gia,

    There is no tool that computes the scalar product for the J-fields from two sensors/simulation. However, you can try to access the fields from Python and compute the product yourself.

    You can extract the J-field in the UI, and then right-click the lowers algorithm in your Analysis tree and select ToPython. This will help you with writing a script to extract certain quantities.

    Best,
    Habib

  • Question about the flux evaluation

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    J(x,y,z,f0) is the volume current density:

    081c7de2-7f8f-4450-8e4c-bd69ad8a8ec7-image.png

    So integrating it's flux across a surface, one gets A/m^2 m^2, which simplifies as A. The unit shown in the table viewer unfortunately does not do the simplification...

  • Impedance plotting

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    Dear @Michael-0

    Please refer to books like Microwave Engineering by Pozar. The impedance matrix is defined as shown in the attached figure (from Pozar) and Z_ii is the input impedance seen looking into port i when all other ports are open-circuited.

    inpedancematrix.png

  • This topic is deleted!

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  • User-Defined Analysis Pipelines

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  • IMAnalytics Data Preprocessing

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    hi @mkn,

    I am not sure the indexing will work correctly following your import+renaming workflow. The reason (and that will answer your first question too) is that the indexing is done directly on the 'Output.h5' files and completely ignores the .smash ones. So renaming the simulations in the Sim4Life project may not have the desired effect, unless it also modifies the Output.h5 results.
    The indexing also does not move, modify or otherwise reorganize your collection of Output.h5 files. This has to be done manually, following the folder hierarchy that I described earlier. The indexing itself simply parses the files it finds and builds an index (ending with .sqlite). It is basically at this stage that your output.h5 files acquire some semantic "meaning" (i.e. that they are associated with a given birdcage coil, anatomical model, etc...).

    The "position" is indeed the relative position of the body with respect to the coil. In MRIxViP, the landmark position is defined as the distance between the isocenter of a given bone in the skull of the body and the isocenter of the coil, along the direction of the z-axis of the coil. Note that IMAnalytics will blindly trust that the Output.h5 files it finds in a given folder correspond to the configuration determined by the indexing process (i.e. the labelling of the data is done by placing the files in the correct folders).