[Intl_DxMedPhys] Intl_dxmedphys_wd_osu_list Digest, Vol 6, Issue 12

[Steven Shea]

Nima, have you looked into see if the AC power is the potential source or
amplifying the issue? I know that is a common source of hum on microphones
(60 Hz noise). A simple solution would be to try the dictation microphones
on a laptop that is running off of battery. (That's assuming you can
reliably induce the noise hum on the reading stations.)

This post has some hints, but I fear this is an oversimplification of the
problem
https://urldefense.com/v3/__https://www.techhive.com/article/582313/how-to-get-rid-of-hum-and-eliminate-other-noises-from-your-audio-and-video-systems.html__;!!KGKeukY!zsolknrN7cRiiljxbR0Tm6j1GqqzCWiC0epSeDpCYlj30UYbM3_3QvyRil8UgFV6P2-6IdxJAupiKuT7_2obvrczWIwvbCmUOxXxuogLZ0rQpROS$ 

The equipment room electronics (RF & gradient amplifiers) are the likely
culprits if the noise source is truly tied to active image acquisition on
the MRI.

Good luck!
Steve

Steven Shea, PhD
Associate Professor, MR Scientist
Department of Radiology & Medical Imaging. Loyola Medicine


On Thu, May 15, 2025 at 11:00 AM <
intl_dxmedphys_wd_osu_list-request at lists.osu.edu> wrote:

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> Today's Topics:
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>    1. MR interference with microphones (Nima Kasraie)
>
>
>
> ---------- Forwarded message ----------
> From: Nima Kasraie <Nima.Kasraie at utsouthwestern.edu>
> To: "intl_dxmedphys_wd_osu_list at lists.osu.edu" <
> intl_dxmedphys_wd_osu_list at lists.osu.edu>
> Cc:
> Bcc:
> Date: Thu, 15 May 2025 14:09:42 +0000
> 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).
>
>
>
>
>
> 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?
>
>
>
>
>
> *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
>
>
>
> ------------------------------
>
> UT Southwestern
>
> Medical Center
>
> The future of medicine, today.
>
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