Ultrasound Flow Imaging Angle Optimization for Velocity Aliasing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vector flow imaging technologies using multi-angle transmitting and receiving are prone to aliasing, which leads to deviations in velocity magnitude and direction, and increasing the pulse repetition frequency or reducing transmitting angles can either reduce aliasing or decrease accuracy, making it difficult to achieve high-precision flow imaging.
Innovation Solution
A processing method and ultrasound imaging device that determine a first target number of transmitting angles based on sound speed, center frequency, imaging depth, and velocity measurement range to minimize aliasing while maintaining high precision, using formulas such as M≤c2/(8νmaxf0×Depth) to calculate optimal transmitting angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pulse repetition frequency (PRF) is increased to reduce aliasing, then the possibility of aliasing is reduced, but the imaging depth must be reduced or the frame rate is limited
Solution Approach 1:
The patent segments the velocity measurement into multiple components by transmitting ultrasound waves at different angles. Instead of measuring the complete velocity vector in a single high-PRF transmission, the system divides the measurement into multiple lower-PRF transmissions at different angles, synthesizing the final velocity magnitude and direction from these components. This segmentation allows each individual measurement to use lower PRF without aliasing while still achieving the overall velocity measurement goal.
2Measurement precision
If the number of transmitting angles is increased to improve velocity accuracy, then the accuracy of synthesized velocity is improved, but the pulse repetition frequency (PRF) decreases making aliasing more likely
Solution Approach 1:
The patent dynamically adjusts the PRF for each transmitting angle based on the flow velocity characteristics in that direction. Rather than using a fixed low PRF for all angles, the system adapts the PRF setting for each angle to match the actual velocity magnitude and direction, allowing optimal PRF utilization while maintaining accuracy across multiple angles.
3Adaptability or versatility
If multi-angle transmitting is used to achieve vector flow imaging, then the velocity magnitude and direction can be obtained, but the system becomes prone to aliasing errors
Solution Approach 1:
The patent incorporates feedback mechanisms where the measured velocity components from different angles are used to validate and refine the overall velocity vector calculation. The system continuously monitors the consistency of velocity measurements across different angles and uses this feedback to detect potential aliasing errors, adjusting the measurement strategy accordingly to maintain reliability.
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 allows for high-precision flow imaging with reduced aliasing by determining the optimal number of transmitting angles, improving the accuracy of velocity calculations and minimizing errors in synthesized velocity measurements.
Implementation Method 1
a transmitting circuit which may be configured to excite the probe to transmit ultrasound waves to a target object; a receiving circuit which may be configured to control the probe to receive ultrasound echoes returned from the target object
Implementation Method 2
receive ultrasound echoes returned from the target object
Implementation Method 3
Flow imaging parameters may include a sound speed for calculation in the flow imaging, a center frequency of a transmitting pulse for exciting a probe and an imaging depth; obtaining a velocity measurement range; and determining a first target number of different transmitting angles according to the sound speed for calculation in the flow imaging, the center frequency of the transmitting pulse for exciting the probe, the imaging depth and the velocity measurement range
Data Source
AI summary
Embodiments of the present disclosure provide a flow imaging processing method, which may include determining flow imaging parameters, where the flow imaging parameters include a sound speed for calculation, a center frequency of the transmitting pulse for exciting a probe and a imaging depth; obtaining a velocity measurement range; and determining the first target number of the different transmit angles according to the sound speed for calculation, the center frequency of the transmitting pulse, the imaging depth and the velocity measurement range. The embodiments of the present disclosure also provide an ultrasound imaging device.