System and method for measuring arterial vessels using near infrared spectroscopy at simultaneous multiple wavelengths
OwnerJames Farinainventor
Life of this patent
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Abstract
A system and method for improving the examination of vessel walls through fluid using near infrared (NIR) spectroscopy by employing a parallel measurement where all wavelengths are measured simultaneously. The system and method of the present invention obviates that need to attempt to overcome the motion of a catheter by complex filtering or averaging over time by performing the measurements for each wavelength under identical conditions.
Claims20
A method for optically examining blood vessel walls with a probe through intervening fluid, the method comprising:
- simultaneously illuminating the vessel walls with multiple spectral sources;
- receiving optical signals from the vessel walls through the intervening fluid at the probe;
- and
- analyzing the optical signals to determine the wavelength dependency of the reflectivity of the vessel wall.
A system for optically examining blood vessel walls with a probe through intervening fluid, the system comprising:
- a probe to illuminate the vessel walls with multiple spectral sources;
- a detector to receive optical signals from the probe;
- and
- a processor to analyze and measure the spectral information.
A system for measuring plaque in arteries, comprising:
- a plurality of optical sources;
- a plurality of frequency sources, each one of the plurality of frequency sources having a different frequency and being connected to one of the plurality of optical sources to modulate the output of each one of the plurality of optical sources;
- a wavelength division multiplexer that receives the output of each one of the plurality of optical sources and forms an optical output signal;
- an optical fiber that can conduct the optical output signal and that can receive a reflected optical signal;
- an optical detector that can detect the reflected optical signal;
- a plurality of bandpass filters, each one of the plurality of bandpass filters having a passband related to one of the plurality of frequency sources;
- and
- a plurality of demodulators, each one of the plurality of demodulators being connected to one of the plurality of bandpass filers.
Dependencies are inferred from the claim text.