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Super-harmonic imaging: development of an interleaved phased-array transducer.

Paul L M J van Neer¹, Guillaume Matte, Mikhail G Danilouchkine

¹Department of Biomedical Engineering, Erasmus Medical Centre, Rotterdam, The Netherlands. p.vanneer@erasmusmc.nl

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|February 25, 2010

Summary

Super-harmonic imaging (SHI) offers improved resolution and artifact suppression compared to traditional methods. A novel interleaved dual frequency array demonstrates excellent performance for SHI and other advanced ultrasound techniques.

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Area of Science:

Medical Imaging
Ultrasound Technology
Biomedical Engineering

Background:

Second-harmonic imaging is the current standard in ultrasound.
Super-harmonic imaging (SHI) leverages higher harmonic frequencies (3rd-5th) for enhanced image quality.
SHI offers potential for reduced near-field artifacts and improved axial/lateral resolution.

Purpose of the Study:

To present the design and performance of a new interleaved dual frequency array optimized for SHI.
To evaluate the array's suitability for SHI and other advanced ultrasound imaging modalities.

Main Methods:

Development of a novel interleaved dual frequency array.
Characterization of array performance, including transmission/reception efficiency and bandwidth.
Assessment of element crosstalk and harmonic transmission efficiency.

Main Results:

The new array exhibits a combined -6-dB bandwidth of 144%, exceeding SHI requirements (>130%).
The array demonstrates high efficiency in both transmission and reception with well-behaved transfer functions.
Minimal contamination of harmonic components due to low crosstalk (< 30 dB) and low odd harmonic transmission efficiency (< 46 dB).

Conclusions:

The developed interleaved dual frequency array possesses ideal characteristics for super-harmonic imaging.
The array is also suitable for other advanced ultrasound techniques, including second-harmonic, subharmonic, and SURF imaging.
This array advancement promises clearer ultrasound images and broader applicability in medical diagnostics.