[FieldTrip] Missing dataset for OPM phantom tutorial

Wed Sep 23 12:32:29 CEST 2026

Hi Naidile,

To follow up on this. Rumour has it that the data by now has been uploaded, although I haven’t checked this myself. If you want, you can check it out.

Happy computing,

Jan-Mathijs

On 10 Sep 2026, at 12:24, Naidile S - 240900566 - MITMPL via fieldtrip <fieldtrip at science.ru.nl> wrote:

Thank you for your response. I have created the GitHub issue as requested:

https://github.com/fieldtrip/fieldtrip/issues/2616<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Ffieldtrip%2Ffieldtrip%2Fissues%2F2616&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C64cadc09fab34511d51a08df195df804%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639257563515203770%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=rEXA9x0DuBDM61HQh9FGs6LbnDMyISTmE2E%2BJPLdaJg%3D&reserved=0>

Best wishes,
Naidile

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Subject: fieldtrip Digest, Vol 190, Issue 4

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Today's Topics:

   1. Re: Missing dataset for OPM phantom tutorial
      (Schoffelen, J.M. (Jan Mathijs))

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Message: 1
Date: Thu, 10 Sep 2026 07:08:57 +0000
From: "Schoffelen, J.M. (Jan Mathijs)"
        <janmathijs.schoffelen at donders.ru.nl<mailto:janmathijs.schoffelen at donders.ru.nl>>
To: FieldTrip discussion list <fieldtrip at science.ru.nl<mailto:fieldtrip at science.ru.nl>>
Subject: Re: [FieldTrip] Missing dataset for OPM phantom tutorial
Message-ID: <41E72FA7-5423-403B-A602-C2252B77DE4C at donders.ru.nl<mailto:41E72FA7-5423-403B-A602-C2252B77DE4C at donders.ru.nl>>
Content-Type: text/plain; charset="utf-8"

Hi Naidile,

Yes indeed, you are right. I can confirm that these data are missing from the download server. Could you please make an issue out of this on the Fieldtrip github repo for follow up?

Thanks and with best wishes,
Jan-Mathijs Schoffelen

On 9 Sep 2026, at 09:50, Naidile S - 240900566 - MITMPL via fieldtrip <fieldtrip at science.ru.nl<mailto:fieldtrip at science.ru.nl>> wrote:

Dear FieldTrip community,
I am trying to follow the tutorial “Using a MEG phantom for validation and OPM calibration”:
https://www.fieldtriptoolbox.org/tutorial/source/opm_phantom/<https://www.fieldtriptoolbox.org/tutorial/source/opm_phantom/><https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.fieldtriptoolbox.org%2Ftutorial%2Fsource%2Fopm_phantom%2F%253Chttps%3A%2F%2Fwww.fieldtriptoolbox.org%2Ftutorial%2Fsource%2Fopm_phantom%2F%253E&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C64cadc09fab34511d51a08df195df804%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639257563515276332%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=5oLHcNOkdsYvPB4bNyE9nUhMEti%2BmRO0eSNPqv%2FO2Mg%3D&reserved=0>
The tutorial refers to the following CTF dataset:
phantom_3031000.01_20260721_01.ds
It also requires:
cad_mesh.mat
However, the corresponding directory on the FieldTrip download server appears to be empty:
https://download.fieldtriptoolbox.org/tutorial/opm_phantom/<https://download.fieldtriptoolbox.org/tutorial/opm_phantom/><https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.fieldtriptoolbox.org%2Ftutorial%2Fopm_phantom%2F%253Chttps%3A%2F%2Fdownload.fieldtriptoolbox.org%2Ftutorial%2Fopm_phantom%2F%253E&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C64cadc09fab34511d51a08df195df804%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639257563515317514%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=TT2LgbaTG1wgKVULgr2Ej293ThwZyIlroiGqxxSqIbM%3D&reserved=0>
Could you please let me know where I can download the CTF phantom dataset and cad_mesh.mat? If available, I would also appreciate information about downloading the FieldLine OPM recording used in the tutorial.
Thank you for your help.
Kind regards,
Naidile S

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