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Grating lobe mitigation on large-pitch arrays using null subtraction imaging.

Mick Gardner¹, Rita J Miller¹, Michael L Oelze¹

¹Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 306 N Wright St, Urbana, IL, 61801, USA.

|March 26, 2024

Summary

This summary is machine-generated.

Null Subtraction Imaging (NSI) significantly reduces grating lobes in ultrasound imaging, improving image quality and enabling wider fields of view for applications like abdominal imaging.

Keywords:

Apodization Beamforming Grating lobes Null Subtraction Imaging Sparse array f-number

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Area of Science:

Medical Imaging
Ultrasound Technology
Signal Processing

Background:

Null Subtraction Imaging (NSI) is a novel beamforming technique.
NSI offers high spatial resolution and low computational cost.
NSI can mitigate grating lobes, artifacts that reduce image contrast.

Purpose of the Study:

To investigate the feasibility of NSI with large pitch, wide field-of-view arrays.
To quantify grating lobe reduction by NSI under various experimental conditions.
To assess NSI's impact on image quality metrics in ultrasound imaging.

Main Methods:

Experiments were conducted using NSI and delay-and-sum (DAS) beamforming.
Grating lobe reduction was measured against array pitch, DC offset, and f-number.
Testing involved wire and contrast targets in phantoms, with in vivo verification on rabbit liver.

Main Results:

NSI reduced grating lobe brightness by up to 45 dB compared to DAS.
Generalized contrast-to-noise ratio (gCNR) in grating lobe regions improved from 0.60 to 0.08.
gCNR of anechoic regions increased from 0.09 to 0.15 with a 5-wavelength pitch array.
Speckle quality was maintained similar to DAS.

Conclusions:

NSI effectively reduces grating lobes, even with large pitch arrays.
This reduction allows for wider fields of view without compromising image quality.
NSI demonstrates significant potential to enhance ultrasound imaging, particularly for abdominal applications.