[Intl_DxMedPhys] MR interference with microphones

[Bob Kobistek]

Try a trick that we hams use – a snap-on ferrite choke.

Amazon.com : ferrite choke<https://urldefense.com/v3/__https://www.amazon.com/s?k=ferrite*choke&crid=1WS7GPXP3VE4S&sprefix=ferrite*c*2Caps*2C164&ref=nb_sb_ss_p13n-pd-dpltr-ranker_2_9__;KyslJQ!!KGKeukY!zMd5nefGdMFB-kq5Nyc9ep4B3nZuCfvMSc8-sPgB5sal3tRohJp580Dih3PKV76tVyzq434E7BmDQC-0mT5-aikKA3NDfAp7BJZzyA$ >



Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)
Medical Physicist
RJK Medical Physics, Inc.
440-463-7879

From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+bob=rjkmedphys.com at lists.osu.edu> On Behalf Of Nima Kasraie via Intl_dxmedphys_wd_osu_list
Sent: Thursday, May 15, 2025 10:10 AM
To: intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: [Intl_DxMedPhys] MR interference with microphones

Hello group, Some of my Radiologists are complaining to me that when there’s a patient inside the magnet, their dictation microphones pick up an annoying static (I assume from the RF coils). Anyone of y’all out there ever come across something
Hello group,

Some of my Radiologists are complaining to me that when there’s a patient inside the magnet, their dictation microphones pick up an annoying static (I assume from the RF coils).

[cid:image003.png at 01DBC5DF.FE41B6E0]

Anyone of y’all out there ever come across something like this?

Solutions I’m thinking of:


  *   Wrapping the cable with Copper foil (just to see what happens!). iow, can these be shielded? ChatGPT says there’s something called a “balanced XLR cable”. Any of y’all ever come across these?
  *   Perhaps there is a mic model out there specifically addressing this? Maybe a fiber optics mic. But how functional are these?


Thoughts?


[cid:image004.png at 01DBC5DF.FE41B6E0]
Nima Kasraie, PhD, MSc, DABR, DABSNM
Lead Physicist, Children’s Medical Center Dallas<https://urldefense.com/v3/__https:/www.childrens.com/__;!!KGKeukY!wp5BMov15Oa3voRZAAkKn9WtyTmMhlOOPk6vB2vo-jwwCAVxL-1uDyXYlzuhfQpl9pXYoEHzkLks_zPQEnQMymqIsTYrb3NdR0yyXmIFvInWKAqM-OiaLw$>
Associate Professor, Department of Radiology, UT Southwestern<https://urldefense.com/v3/__https:/profiles.utsouthwestern.edu/profile/187443/nima-kasraie.html__;!!KGKeukY!wp5BMov15Oa3voRZAAkKn9WtyTmMhlOOPk6vB2vo-jwwCAVxL-1uDyXYlzuhfQpl9pXYoEHzkLks_zPQEnQMymqIsTYrb3NdR0yyXmIFvInWKAq4FA74Zw$>
Phone: 214-648-7978
[cid:image005.png at 01DBC5DF.FE41B6E0]


________________________________

UT Southwestern

Medical Center

The future of medicine, today.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.osu.edu/mailman/private/intl_dxmedphys_wd_osu_list/attachments/20250516/b49671e3/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.png
Type: image/png
Size: 94228 bytes
Desc: image003.png
URL: <https://lists.osu.edu/mailman/private/intl_dxmedphys_wd_osu_list/attachments/20250516/b49671e3/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.png
Type: image/png
Size: 10985 bytes
Desc: image004.png
URL: <https://lists.osu.edu/mailman/private/intl_dxmedphys_wd_osu_list/attachments/20250516/b49671e3/attachment-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.png
Type: image/png
Size: 31503 bytes
Desc: image005.png
URL: <https://lists.osu.edu/mailman/private/intl_dxmedphys_wd_osu_list/attachments/20250516/b49671e3/attachment-0002.png>