MRI Patient Speech Transmission With Reduced-Carrier Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic resonance imaging devices are susceptible to electromagnetic interference from wireless patient microphones, which can cause imaging artifacts and disrupt the imaging process due to interference signals.
Innovation Solution
A method involving modulation with reduced carrier signal levels is used to transmit speech signals, where the carrier signal is reduced by a factor of -10 dB to -40 dB, allowing the communication signal to be demodulated without interfering with the imaging process, using techniques like DSB-RC, SSB-RC, or SSB-SC modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a wireless patient microphone with full carrier level modulation is used to transmit speech signals, then speech intelligibility is improved, but electromagnetic interference with the MR imaging process increases causing artifacts
Solution Approach 1:
The patent changes the parameter of carrier signal level from full level to reduced level (by -10 dB to -40 dB). This parameter modification allows the communication signal to maintain sufficient speech intelligibility while significantly reducing the electromagnetic interference power that causes artifacts in the MR imaging process.
Solution Approach 2:
The patent converts the potentially harmful full-power carrier signal into a beneficial reduced-power carrier signal. By intentionally reducing the carrier level, the system transforms what would be a source of interference into a controlled signal that maintains communication functionality while protecting the MR imaging from harmful electromagnetic effects.
2Object-affected harmful factors
If the carrier signal level is reduced by -10 dB to -40 dB, then electromagnetic interference is reduced, but power consumption of the communication device decreases
Solution Approach 1:
The patent applies parameter change by reducing the carrier signal level from full power to a reduced level (-10 dB to -40 dB). This single parameter modification simultaneously achieves two beneficial effects: reducing electromagnetic interference with the MR imaging process and lowering the power consumption of the wireless communication device.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces interference, lowers power consumption, and enables continuous speech signal transmission during MR imaging without disrupting the imaging process, allowing for efficient and synchronized speech reception.
Implementation Method 1
the speech signal is modulated onto a carrier signal, and wherein the modulated signal is generated by way of a modulation with reduction of the level of the carrier signal
Data Source
AI summary
Techniques are disclosed for transferring at least one speech signal of a patient during a magnetic resonance imaging examination, wherein the speech signal is recorded by a speech recording device of a wireless communication device assigned to the patient and transmitted at least as part of a communication signal to a receive device of the magnetic resonance imaging device. The communication signal is a modulated signal or is generated from a modulated signal, and to generate the modulated signal the speech signal is modulated onto a carrier signal. The modulated signal is generated by way of a modulation with reduction of the level of the carrier signal.