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Optimization of point spread function in ultrasound arrays
M Sakhaei1, A Mahloojifar, A Malek
1Department of Biomedical Engineering, Tarbiat Modarres University, P.O. Box 14115-143 Tehran, Iran. SAKHAEI@modares.ac.ir
Ultrasonics
|December 3, 2005
Summary
This study presents a new method for designing ultrasound array aperture weightings. It optimizes both the point spread function and signal-to-noise ratio (SNR), offering improved performance and flexibility for array designers.
Area of Science:
- Ultrasound array design
- Acoustic imaging
- Signal processing
Background:
- Ultrasound array design involves multi-objective optimization of parameters like delays and aperture size.
- Apodization in ultrasound arrays can decrease the signal-to-noise ratio (SNR).
Purpose of the Study:
- To introduce a novel aperture design method for ultrasound arrays.
- To optimize both the lateral point spread function and SNR.
- To provide a method for selecting optimal aperture weights based on application needs.
Main Methods:
- Developed an analytic expression for the lateral point spread function.
- Created a model for SNR as a nonlinear function of aperture weights.
- Established a new aperture design method yielding optimal weights.
Main Results:
- The new method provides an optimal set of weights for the point spread function with a predetermined peak sidelobe level and optimized SNR.
- Results show a trade-off: decreasing peak sidelobe level leads to decreased SNR.
- The method maintains consistent beam properties over a wide range (20-120 mm) with minimal SNR variations (1 dB).
Conclusions:
- The developed method allows array designers to select appropriate weights based on a SNR versus peak sidelobe level curve.
- This approach offers superior SNR performance and a longer effective range compared to conventional methods.
- The technique ensures stable beam properties and enhanced SNR across varying depths.