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Three-dimensional super resolution ultrasound imaging with a multi-frequency hemispherical phased array.

Lulu Deng¹, Harriet Lea-Banks¹, Ryan M Jones¹

¹Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Ontario, Canada.

Medical Physics

|September 13, 2023

Summary

This study introduces a novel ultrasound method using nanodroplets for high-resolution brain vascular imaging, overcoming skull distortion limitations. The technique achieves significantly improved spatial resolution for enhanced diagnostic capabilities.

Keywords:

focused ultrasound nanodroplet passive acoustic mapping super resolution

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Published on: February 12, 2014

Area of Science:

Biomedical Engineering
Medical Imaging
Acoustics

Background:

High-resolution microvasculature imaging is crucial for brain diagnostics and therapeutics.
Ultrasound imaging of brain vasculature is limited by skull bone distortion, leading to low axial resolution.

Purpose of the Study:

To overcome limitations in brain vascular imaging resolution.
To visualize acoustic emissions from ultrasound-vaporized nanodroplets for passive acoustic mapping and super-resolution imaging.

Main Methods:

Utilized a 256-module sparse hemispherical array for ultrasound transmission and reception.
Vaporized lipid-coated decafluorobutane nanodroplets with 55 kHz ultrasound, receiving emissions at 612 or 1224 kHz.
Employed delay, sum, and integrate beamforming for normal resolution images and Gaussian fitting for super-resolution extraction.

Main Results:

Achieved super-resolution lateral (axial) full-width-at-half-maximum of 7 ± 1 μm (15 ± 2 μm) at 1224 kHz, a ~67-fold improvement over normal resolution.
Demonstrated mean positional uncertainties of ~1/350 (lateral) and ~1/180 (axial) of the receive wavelength.
Observed temporal correlation between nanodroplet vaporization and transmit waveform, suggesting potential for SNR enhancement.

Conclusions:

Demonstrated feasibility of low-frequency ultrasound vaporization of nanodroplets for high-resolution spatial mapping.
This passive acoustic mapping technique significantly improves super-resolution imaging spatial resolution.
Potential for 4D vascular mapping in organs like the brain, breast, and testicles using hemispherical arrays.