Blood-Vessel Recognition via Doppler Frequency Correction
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Solution Overview
Problem
Existing methods for recognizing blood vessels in biological tissue during surgical procedures face challenges in accurately determining the presence and size of blood vessels due to variations in Doppler spectra intensities caused by depth and tissue properties, leading to potential misidentification of blood vessels.
Innovation Solution
A blood-vessel recognizing method and device that utilize real-time Doppler spectra analysis by calculating average frequencies from scattered light intensities, correcting these frequencies based on peak intensities using a conversion equation, and determining blood vessel presence through threshold comparison, enhancing accuracy and precision in identifying large blood vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If Doppler spectra analysis is used to detect blood vessels, then blood vessel detection capability is improved, but measurement precision deteriorates due to intensity variations caused by depth and tissue properties
Solution Approach 1:
The patent transforms the Doppler spectra from frequency domain to time domain by calculating the inverse Fourier transform, then extracts the envelope signal through absolute value operation. This parameter transformation allows the system to measure blood flow velocity magnitude independently of spectral intensity variations caused by depth and tissue properties, thereby resolving the contradiction between detection capability and measurement precision
Solution Approach 2:
The patent introduces an intermediary processing step involving the calculation of average frequency from the time-domain signal and comparison with a reference frequency threshold. This intermediary mechanism acts as a mediator that filters out the harmful intensity variations while preserving the blood vessel detection signal, enabling accurate identification despite variations in Doppler spectra intensities
2Productivity
If real-time Doppler spectra are analyzed without correction, then processing speed is improved, but reliability deteriorates due to inaccurate blood vessel presence determination
Solution Approach 1:
The patent performs preliminary signal processing operations including inverse Fourier transform, absolute value calculation, and envelope extraction before the final blood vessel determination step. These preliminary actions prepare the signal in advance by removing intensity variations and extracting the relevant blood flow velocity information, ensuring that the subsequent threshold comparison yields reliable results without requiring complex real-time corrections
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
The method and device accurately recognize blood vessels by correcting for variations in Doppler spectra, ensuring reliable detection of blood vessel sizes and positions, thereby improving surgical precision by radiating visible light only where large blood vessels are detected.
Implementation Method 1
time waveforms data of intensities of scattered light generated in the biological tissue due to irradiation with laser light
Implementation Method 2
obtaining real-time Doppler spectra on the basis of time waveforms data of intensities of scattered light
Data Source
AI summary
A blood-vessel recognizing method for recognizing blood vessels present in biological tissue, the method including: obtaining real-time Doppler spectra on the basis of time waveforms data of intensities of scattered light generated in the biological tissue due to irradiation with laser light; calculating average frequencies of the real-time Doppler spectra; correcting the calculated average frequencies on the basis of peak intensities of the real-time Doppler spectra; and determining whether or not blood vessels are present in regions of the biological tissue irradiated with the laser light on the basis of the corrected average frequencies.