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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...

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Ultrasonic Imaging of Deeper Bone Defect Using Virtual Source Synthetic Aperture with Phased Shift Migration: A

Linru Xie¹, Chen Jiang², Shuai Han¹

¹Institute of Biomedical Engineering & Technology, Academy for Engineering and Technology, Fudan University, Shanghai, China.

Ultrasonic Imaging

|July 26, 2024

Summary

The new virtual source phase shift migration (VS-PSM) method improves ultrasound bone imaging. This technique enhances contrast-to-noise ratios for deeper bone defect visualization, aiding in bone disease diagnosis.

Keywords:

bone imaging multilayer structure phase shift migration (PSM)ultrasonic imaging virtual source synthetic aperture (VS)

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Area of Science:

Medical Ultrasound
Biomedical Imaging
Acoustic Imaging

Background:

Ultrasound imaging of bone presents challenges due to limited penetration depth and energy.
Traditional synthetic aperture (SA) techniques offer good lateral resolution but are limited in imaging depth.
Virtual source (VS) synthetic aperture enables simultaneous multi-element emission, increasing ultrasonic energy for deeper imaging.

Purpose of the Study:

To develop and validate a novel virtual source phase shift migration (VS-PSM) method for enhanced ultrasound imaging of deeper bone defects.
To evaluate the performance of VS-PSM in multilayered structures, particularly for visualizing bone defects.
To compare the imaging quality of VS-PSM against traditional SA and delay-and-sum (DAS) methods.

Main Methods:

Proposed the virtual source phase shift migration (VS-PSM) method for ultrasonic bone imaging.
Validated the VS-PSM method using soft tissue and bone phantoms with artificial defects.
Assessed image quality using contrast-to-noise ratios (CNR) and scatter/defect amplitudes at various depths.

Main Results:

VS-PSM achieved high-quality imaging of soft tissues with improved scattering amplitude and preserved resolution.
The phase shift migration (PSM) component demonstrated superior background noise suppression compared to delay-and-sum (DAS).
VS-PSM significantly improved CNR by an average of 50% for deeper bone defects compared to traditional SA-PSM across different frequencies.

Conclusions:

The proposed VS-PSM method effectively images deeper bone defects in multilayered structures.
VS-PSM offers superior contrast-to-noise ratios for bone imaging compared to traditional SA-PSM.
This technique holds potential for improving the diagnosis of bone diseases using ultrasound.