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PET/CT background noise and its effect on speech recognition.

Iva Speck¹, Valentin Rottmayer², Konstantin Wiebe²

¹Department of Otorhinolaryngology, Head and Neck Surgery, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Killianstraße 5, 79106, Freiburg, Germany. iva.speck@uniklinik-freiburg.de.

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Summary

New PET/CT scanners generate significant background noise, impacting auditory pathway studies. Speech recognition is better in PET scanner noise than in clinical noise due to its less disruptive masking effect.

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Area of Science:

Neuroimaging
Auditory Neuroscience
Medical Physics

Background:

Positron emission tomography (PET) is crucial for studying the central auditory pathway.
Modern air-cooled PET/CT scanners introduce higher background noise than older water-cooled systems.
This increased noise may affect auditory function investigations.

Purpose of the Study:

To quantify background noise levels in state-of-the-art air-cooled PET/CT scanners.
To assess the impact of this noise on speech recognition in normal-hearing individuals.
To compare PET/CT scanner noise with clinically used speech-shaped noise.

Main Methods:

Measured background noise from two Philips air-cooled PET/CT scanners (Gemini TF64 and Vereos).
Recorded PET noise and a standard speech-shaped noise.
Evaluated speech recognition performance in normal-hearing subjects under both noise conditions.

Main Results:

PET/CT scanners produced considerable noise: 75.1 dB SPL (Philips Gemini TF64) and 76.9 dB SPL (Philips Vereos).
Speech recognition was better in recorded PET background noise compared to clinical speech-shaped noise.
Performance in both noise types showed a significant correlation.

Conclusions:

Background noise from air-cooled PET/CT scanners is substantial and must be considered.
The specific characteristics of PET/CT noise result in less masking than clinical speech-shaped noise.
Researchers investigating the central auditory pathway using PET/CT should account for scanner-generated noise.