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Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

Optoacoustic imaging using fiber-optic interferometric sensors.

Horacio Lamela¹, Daniel Gallego, Alexander Oraevsky

¹Optoelectronic and Laser Technology Group (GOTL), Carlos III de Madrid University, 28911 Leganes, Madrid, Spain. horacio@ing.uc3m.es

|December 3, 2009

Summary

A novel silica optical fiber sensor effectively functions as a wideband ultrasonic transducer for optoacoustic imaging. This fiber-optic sensor demonstrates feasibility for reconstructing images comparable to established systems.

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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

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Area of Science:

Biomedical Optics
Acoustic Imaging
Fiber Optic Sensing

Background:

Optoacoustic imaging offers high resolution for biomedical applications.
Traditional ultrasonic transducers, like piezoelectric arrays, have limitations in bandwidth and sensitivity.
Developing novel wideband ultrasonic transducers is crucial for advancing optoacoustic imaging.

Purpose of the Study:

To present and characterize a nonmetallic silica optical fiber as an ultrasonic wideband transducer.
To evaluate the performance of the fiber-optic sensor in optoacoustic imaging applications.
To compare the imaging capabilities of the fiber-optic sensor with existing technologies.

Main Methods:

An interferometric sensor utilizing a silica optical fiber was designed and fabricated.
The sensor's sensitivity was characterized by detecting optoacoustic signals from a phantom.
Two-dimensional optoacoustic images were reconstructed by scanning the fiber-optic sensor.
Performance was compared against piezoelectric transducers and a commercial Laser Optoacoustic Imaging System (LOIS-64B).

Main Results:

The optical fiber sensor successfully detected optoacoustic signals from embedded absorbers in a tissue-mimicking phantom.
Images reconstructed using the fiber-optic sensor showed comparable quality to those obtained with the LOIS-64B system.
The sensitivity of the fiber-optic sensor was demonstrated through signal detection and image reconstruction.

Conclusions:

The silica optical fiber sensor is a feasible and effective wideband ultrasonic transducer for optoacoustic imaging.
This fiber-optic approach offers a promising alternative to conventional transducers for high-resolution biomedical imaging.
Further development could enhance the capabilities of fiber-optic sensors in clinical optoacoustic applications.