Multi-Beam Spectral Doppler Ultrasound Imaging
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Solution Overview
Problem
Spectral Doppler ultrasound imaging lacks spatial information, requiring manual adjustment of gate locations and limited to acquiring information from a single resolution cell at a time, which restricts its ability to provide comprehensive flow analysis and tissue motion data.
Innovation Solution
The method involves forming spatially distinct transmit beams with laterally spaced foci to acquire spectra from multiple locations simultaneously, using split beam or temporal interleaving based on anatomical operations to ensure time-continuous spectral estimation and accurate data acquisition from multiple regions of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectral Doppler imaging acquires information from a single resolution cell at a time, then spectral information for a specific location is obtained, but spatial information is lost and comprehensive flow analysis is restricted
Solution Approach 1:
The imaging space is divided into multiple resolution cells or regions of interest along the scan line. Each region is independently processed to generate spectral information, allowing simultaneous acquisition of spectral data from multiple spatial locations rather than sequentially processing single gates
Solution Approach 2:
The system transitions from single-point spectral analysis to multi-point spectral analysis by adding spatial dimensionality. Multiple gates are placed at different depths along the same scan line, creating a spatial distribution of spectral measurements that preserves both location-specific and comprehensive flow information
2Loss of information
If multiple gates are placed sequentially to optimize spectrum for different locations, then comprehensive spectral information is acquired, but time consumption increases and productivity decreases
Solution Approach 1:
Multiple spectral measurements from different spatial locations are merged into a single integrated display. The system combines spectral data from multiple gates simultaneously, allowing comprehensive flow analysis across multiple regions without requiring sequential adjustment of each gate
Solution Approach 2:
The spectral Doppler system is enhanced to perform multiple functions simultaneously - it can analyze flow characteristics at multiple locations, provide spatial distribution of velocities, and generate comprehensive flow patterns all in one acquisition cycle, rather than requiring separate measurements for each function
3Ease of operation
If mean velocity is used for flow representation, then simple flow direction information is provided, but sufficient motion information is not provided
Solution Approach 1:
Instead of representing flow with a single mean velocity value, the system provides locally differentiated spectral information at multiple spatial points. Each location maintains its unique velocity distribution characteristics, preserving detailed motion information while allowing simple visual interpretation through the spectral display format
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 enables the acquisition of more comprehensive and accurate spectral Doppler information, allowing for improved flow analysis, tissue motion assessment, and differentiation between types of flow, such as venous and arterial, by providing spatially diverse velocity data that surpasses the limitations of mean velocity imaging.
Implementation Method 1
transmitting a plurality of pulses at a single gate location, a spectral Doppler response is generated in response to received echo signals
Implementation Method 2
Spectral Doppler ultrasound imaging provides an image of velocities (vertical axis) values modulated by energy as a function of time (horizontal axis). The frequency spectrum of the object's motion or flow
Data Source
AI summary
Spatially distinct Spectral Doppler information is acquired. Spatially distinct transmit beams are formed at a same time or in parallel. One or more receive beams are formed in response to each transmit beam, providing samples for a plurality of laterally spaced locations. A spectrum is determined for each of a plurality of spatial locations. In another approach, samples are acquired for different regions at different times. The scanning for each region is interleaved based on the anatomic operation. Since spectral estimation relies on a time-continuous series of transmission and reception, the scanning for a region occurs over a sufficient period for spectral estimation before the scanning for a different region occurs. By using anatomic operation, sufficient time is provided for spectral estimation. Due to anatomic operation, different regions are associated with flow at different times.