Ultrasonic Doppler Phase Signal Global Aliasing Correction
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Solution Overview
Problem
Conventional ultrasonic diagnostic apparatuses face challenges in accurately and stably correcting aliasing velocities in color Doppler images due to noise interference, limiting the observable velocity range and leading to difficult blood flow direction diagnosis.
Innovation Solution
An ultrasonic diagnostic apparatus with a data acquisition unit, correction unit, and display unit that performs global aliasing correction processing based on two-dimensional phase continuity, reducing noise influence through phase signal unwrapping and discrete cosine transformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional unwrap processing is performed one-dimensionally, then processing complexity is reduced, but noise interference causes wrong aliasing correction and unstable results
Solution Approach 1:
The patent transitions from one-dimensional unwrap processing to two-dimensional unwrap processing by considering phase continuity in both horizontal and vertical directions simultaneously. This dimensional expansion allows the system to leverage spatial correlations in both directions, reducing the impact of noise on aliasing correction accuracy while maintaining computational feasibility through efficient algorithms.
2Productivity
If phase signals are corrected without considering two-dimensional continuity, then processing speed is improved, but blood flow direction diagnosis accuracy deteriorates
Solution Approach 1:
The patent implements two-dimensional phase continuity consideration by analyzing phase relationships in both horizontal and vertical dimensions simultaneously. This approach preserves spatial information that is critical for accurate blood flow direction diagnosis while using computationally efficient algorithms to maintain acceptable processing speeds.
Solution Approach 2:
The patent modifies the unwrap processing by introducing two-dimensional phase continuity constraints and adjusting the processing parameters to consider spatial correlations in both directions. This parameter change enables more accurate blood flow direction diagnosis by preserving spatial phase relationships while maintaining processing efficiency through optimized algorithms.
3Reliability
If aliasing correction is performed without two-dimensional phase continuity, then observable velocity range is limited, but processing robustness is maintained
Solution Approach 1:
The patent expands the observable velocity range by implementing two-dimensional unwrap processing that considers phase continuity in both horizontal and vertical directions. This dimensional expansion enables the system to accurately correct aliasing for higher velocity flows while maintaining processing robustness through consistent application of phase continuity constraints across the entire image.
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 apparatus achieves stable and satisfactory aliasing correction of velocity data, enhancing image quality and enabling accurate blood flow direction diagnosis by minimizing noise effects and expanding the observable velocity range.
Implementation Method 1
transmitting and receiving ultrasonic waves to and from the object
Implementation Method 2
extract blood flow information such as a velocity, a power and a dispersion of blood flow by Doppler effect
Data Source
AI summary
An ultrasonic diagnostic apparatus includes a data acquisition unit, a correction unit and a display unit. The data acquisition unit acquires phase signals as Doppler data from a moving object in an object by transmitting and receiving ultrasonic waves to and from the object. The correction unit performs global aliasing correction processing of the phase signals based on a continuity in a two-dimensionally phase change. The display unit displays phase signals after the aliasing correction processing.