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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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Three-dimensional Optical-resolution Photoacoustic Microscopy

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Amir Gholampour, Jan-Willem Muller, Camilo Cano

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|November 9, 2022

Summary

Multiperspective photoacoustic imaging (MP-PAI) using multiple capacitive micromachined ultrasonic transducers (CMUTs) significantly enhances image quality. This approach improves field of view, resolution, and contrast for better tissue assessment.

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Photoacoustic Cystography

Photoacoustic Cystography

Published on: June 11, 2013

Area of Science:

Biomedical optics
Ultrasound technology
Medical imaging

Background:

Photoacoustic imaging (PAI) uses sound waves for tissue analysis.
Current PAI systems with single transducer arrays have limited field of view and resolution.
Capacitive micromachined ultrasonic transducers (CMUTs) offer advantages in bandwidth and cost for PAI.

Purpose of the Study:

To introduce a multiperspective PAI (MP-PAI) approach using multiple CMUTs on a flexible array.
To improve field of view, resolution, and contrast in PAI.
To evaluate the effectiveness of MP-PAI with coherent and incoherent compounding methods.

Main Methods:

Developed a flexible array with multiple CMUTs for MP-PAI.
Conducted in vitro experiments using a plaque-mimicking phantom.
Performed numerical studies to assess MP-PAI performance with varying transducer numbers and angular coverage.

Main Results:

MP-PAI with three CMUTs increased generalized-contrast-to-noise ratio (gCNR) by 20% and peak signal-to-noise ratio (PSNR) by 2 dB.
MP-PAI doubled structural coverage compared to single CMUT setups.
Numerical studies showed image quality improvements up to threefold with 15 transducers and increased angular coverage.

Conclusions:

MP-PAI significantly improves overall image quality, resolution, and contrast.
The number of transducers and angular coverage directly correlate with image quality enhancement.
MP-PAI demonstrates superior ability in resolving structural information within phantoms.