Photoacoustic Measurement Device Needle Alignment Control
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Solution Overview
Problem
Doppler measurements using puncture needles that generate photoacoustic waves face challenges due to weak signals and artifacts caused by reflected waves from the needle, particularly when the insertion direction and sample gate steering direction are not appropriately aligned, leading to inaccurate signal acquisition.
Innovation Solution
A photoacoustic measurement device with a control unit that adjusts the steering direction of the sample gate to maintain an angle between the needle's length direction and the sample gate's steering direction between 0° and 90°, minimizing the impact of reflected waves and enhancing signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Doppler measurement is performed using a puncture needle that generates photoacoustic waves, then the position of the needle can be visualized, but the Doppler signal becomes weak and contains artifacts from reflected waves
Solution Approach 1:
The sample gate steering direction is dynamically adjusted based on the detected needle orientation. The system continuously monitors the needle's length direction and modifies the sample gate angle in real-time to maintain optimal measurement conditions, transforming a static measurement setup into a dynamic adaptive system that eliminates artifacts while preserving signal quality
Solution Approach 2:
The system changes the steering direction parameter of the sample gate based on the needle's orientation parameters. By detecting the needle's length direction and calculating the appropriate steering angle, the system adjusts measurement parameters to minimize reflected wave interference and maximize Doppler signal accuracy
2Adaptability or versatility
If the sample gate steering direction is not aligned with the needle insertion direction, then measurement flexibility is maintained, but reflected waves from the needle contaminate the Doppler signal
Solution Approach 1:
The system employs feedback control by detecting the needle's length direction and using this information to adjust the sample gate steering direction. The feedback loop ensures that the measurement configuration adapts to the actual needle orientation, maintaining measurement precision while preserving the ability to measure in different directions
Solution Approach 2:
The system performs preliminary detection of the needle's length direction before conducting Doppler measurements. This preliminary action allows the system to pre-align the sample gate steering direction with the needle orientation, preventing artifact contamination before measurements begin while maintaining measurement flexibility
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 effectively suppresses artifacts in the Doppler signal, allowing for more accurate Doppler measurements by optimizing the alignment between the needle and the sample gate, thereby improving the reliability of blood flow rate assessments during procedures.
Implementation Method 1
a photoacoustic wave generation portion that absorbs light and generates photoacoustic waves
Implementation Method 2
ultrasonic waves (photoacoustic waves) are generated by adiabatic expansion caused by the energy
Implementation Method 3
the ultrasonic waves travel in the living body and are reflected from the interface between tissues
Implementation Method 4
Doppler measurement is a measurement method that non-invasively measures, for example, hemodynamics, a blood flow rate, and trends in vivo on the basis of the Doppler shift of the frequency of received waves
Data Source
AI summary
Provided is a photoacoustic measurement device including: an ultrasound image generation unit that generates an ultrasound image on the basis of a detection signal of reflected ultrasonic waves generated by the transmission of ultrasonic waves; a puncture needle detection unit that detects a length direction of a puncture needle on the basis of the ultrasound image; and a controller that controls a steering direction of a sample gate which is a Doppler measurement target on the basis of the length direction of the puncture needle such that an angle θ formed between a straight line extending in the length direction of the puncture needle and a straight line extending in the steering direction of the sample gate satisfies 0°≤θ<90°.