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Ultrasonography

Ultrasonography

Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called a...

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Related Experiment Video

Updated: Jul 7, 2026

Real-time Monitoring of High Intensity Focused Ultrasound HIFU Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound HMIFU

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Published on: November 3, 2015

Optimization of Ultrasound Phase-Encoded Multiplane Wave Tissue Harmonic Imaging.

Che-Chou Shen¹, Ching-Che Chiu¹, You-Lin Chu¹

¹National Taiwan University of Science and Technology, Taipei, Taiwan.

Ultrasonic Imaging

|March 31, 2026

Summary

This summary is machine-generated.

Hadamard coding with a rectangular waveform offers optimal phase-encoded multiplane wave tissue harmonic imaging. This configuration balances improved signal-to-noise ratio and reduced artifacts for enhanced diagnostic accuracy.

Keywords:

bit waveform coded excitation harmonic imaging multiplane wave transmission signal-to-noise ratio ultrafast imaging

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Last Updated: Jul 7, 2026

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Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

Published on: March 6, 2019

Area of Science:

Medical imaging
Ultrasound technology
Signal processing

Background:

Tissue harmonic imaging (THI) offers better resolution than conventional imaging but has low signal-to-noise ratio (SNR).
Phase-encoded excitation can improve THI's SNR, but signal distortion can cause artifacts.
Optimizing coding schemes and waveforms is crucial for accurate THI.

Purpose of the Study:

To compare different coding matrices (Hadamard, S-sequence, Golay) and bit waveforms for phase-encoded multiplane wave (MW) tissue harmonic imaging.
To identify the optimal configuration for maximizing SNR and minimizing artifacts in THI.
To validate simulation and experimental findings on coding schemes and waveforms.

Main Methods:

Simulations and experiments were used to analyze coding schemes and bit waveforms.
Phase-encoded tissue harmonic imaging with multiplane wave transmission was employed.
Hadamard, S-sequence, and orthogonal Golay coding matrices were evaluated with different bit waveforms.

Main Results:

Bipolar codes (Hadamard, Golay) were susceptible to phase distortion, causing axial artifacts.
Hadamard coding avoided artifacts by adjusting plane wave angles, while S-sequence showed no distortion but lower SNR gain.
Rectangular waveforms improved SNR but caused spectral distortion, especially with Golay, leading to artifacts and reduced contrast.

Conclusions:

Hadamard coding with a rectangular waveform and selective compounding is optimal for phase-encoded MW tissue harmonic imaging.
This configuration provides higher SNR than S-sequence and better image quality than orthogonal Golay.
The findings offer guidance for improving THI performance and diagnostic capabilities.