[Intl_DxMedPhys] Intl_dxmedphys_wd_osu_list Digest, Vol 6, Issue 12

Fri May 16 18:30:39 EDT 2025

Hello,

Interference only happens during a pulse sequence running. It’s not constant.

[cid:image001.png at 01DBC688.3D03C230]
Nima Kasraie, PhD, MSc, DABR, DABSNM
Lead Physicist, Children’s Medical Center Dallas<https://urldefense.com/v3/__https://www.childrens.com/__;!!KGKeukY!wTVBJtLQiCY6KPmeosDZ1WwClVzd3H-0E6mGRqlaGfkgpiFhUMQkaz4zHPErWTYLXsvqzMs-VnmUcVbLba9r_ULpsaVpXTFf_xqoh8NhyAsjqODN0kDKwQ$ >
Associate Professor, Department of Radiology, UT Southwestern<https://urldefense.com/v3/__https://profiles.utsouthwestern.edu/profile/187443/nima-kasraie.html__;!!KGKeukY!wTVBJtLQiCY6KPmeosDZ1WwClVzd3H-0E6mGRqlaGfkgpiFhUMQkaz4zHPErWTYLXsvqzMs-VnmUcVbLba9r_ULpsaVpXTFf_xqoh8NhyAsjqOA_GrH4Fw$ >
Phone: 214-648-7978
[cid:image002.png at 01DBC688.3D03C230]

From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+nima.kasraie=utsouthwestern.edu at lists.osu.edu> On Behalf Of Steven Shea via Intl_dxmedphys_wd_osu_list
Sent: Friday, May 16, 2025 3:09 PM
To: intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: Re: [Intl_DxMedPhys] Intl_dxmedphys_wd_osu_list Digest, Vol 6, Issue 12

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

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
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!wTVBJtLQiCY6KPmeosDZ1WwClVzd3H-0E6mGRqlaGfkgpiFhUMQkaz4zHPErWTYLXsvqzMs-VnmUcVbLba9r_ULpsaVpXTFf_xqoh8NhyAsjqODCIZkyCg$ <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

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Today's Topics:

   1. MR interference with microphones (Nima Kasraie)

---------- Forwarded message ----------
From: Nima Kasraie <Nima.Kasraie at utsouthwestern.edu<mailto:Nima.Kasraie at utsouthwestern.edu>>
To: "intl_dxmedphys_wd_osu_list at lists.osu.edu<mailto:intl_dxmedphys_wd_osu_list at lists.osu.edu>" <intl_dxmedphys_wd_osu_list at lists.osu.edu<mailto: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).

[cid:image003.png at 01DBC688.3D03C230]

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:image001.png at 01DBC688.3D03C230]
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:image002.png at 01DBC688.3D03C230]

________________________________

UT Southwestern

Medical Center

The future of medicine, today.

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