Accessible Requires Authentication Published by De Gruyter September 6, 2018

Wireless video transmission into the MRI magnet room: implementation and evaluation at 1.5T, 3T and 7T

Bennet Hensen, Urte Kägebein, Marcel Gutberlet, Kristina I. Ringe, Van Dai Vo-Chieu, Daniel Stucht, Oliver Speck, Ralf Vick, Frank Wacker and Enrico Pannicke

Abstract

Purpose

To analyze the interference between a wireless high definition multimedia interface (WHDMI) and magnetic resonance imaging (MRI) image quality at 1.5T, 3T and 7T.

Materials and methods

A wireless video transmission system (WVTS) consisting of a WHDMI and a projector was used to transmit and display a video stream into the magnet room. MR image quality was analyzed at 1.5T, 3T and 7T. Signal-to-noise-ratio (SNR¯) and radio frequency (RF)-noise spectrum were measured at three transmitter positions (A: inside the cabin, B: in front of the waveguide and C: in the control room). WVTS system functionality tests included measurements of reliability, delay and image quality.

Results

With the WVTS mean SNR¯ values significantly decreased in comparison to the reference for all positions and fieldstrenghts, while the spectra’s baseline is elevated at 1.5T and 3T. Peaks related to continuous wave interferences are apparent at all field strenghts. For WHDMI alone mean SNR¯ values were stable without significant differences to the reference. No elevation of the spectra’s baseline could be observed. Functionality measurements confirmed high connection reliability with stable image quality and no delays for all field strengths.

Conclusion

We conclude that wireless transmission of video streams into the MRI magnet room is feasible at all field strengths without hampering image quality.

  1. Research funding: This study was financially supported by the Federal Ministry of Education and Research (BMBF), Funder Id: 10.13039/501100002347, grant number 13GW0095A and 13GW0095C.

  2. Conflict of interest: Authors state no conflict of interest.

  3. Informed consent: Informed consent is not applicable.

  4. Ethical approval: The conducted research is not related to either human or animal use.

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Received: 2018-05-12
Accepted: 2018-07-16
Published Online: 2018-09-06
Published in Print: 2019-08-27

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