[Intl_DxMedPhys] MR interference with microphones

[Bob Kobistek]

I should also mention that the RF interference can be entering the system via any of the cables that go into the workstation – not necessarily just the microphone cable.


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 at lists.osu.edu> On Behalf Of Bob Kobistek via Intl_dxmedphys_wd_osu_list
Sent: Thursday, May 15, 2025 9:26 PM
To: Nima Kasraie <Nima.Kasraie at UTSouthwestern.edu>; intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: Re: [Intl_DxMedPhys] MR interference with microphones

Try a trick that we hams use – a snap-on ferrite choke. Amazon. com : ferrite choke 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@ lists. osu. edu>
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<mailto: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<mailto: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:image001.png at 01DBC63E.3FB944E0]

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:image002.png at 01DBC63E.3FB944E0]
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:image003.png at 01DBC63E.3FB944E0]


________________________________

UT Southwestern

Medical Center

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