A fiber optic ultrasound transducer for biomedical ultrasound imaging applications
Jingcheng Zhou, Nan Wu, Xingwei Wang*
Department of Electrical and Computer Engineering, University of Massachusetts Lowell,
Lowell MA 01854, USA
Results: generation
2.A novel material, gold nanocomposite, was
synthesized by directly reducing gold
nanoparticles
within
polydimethylsiloxane
(PDMS) through a one-pot protocol.
3.A chicken wing was used as the biomedical
ultrasound imaging target. The fiber optic
ultrasound transducer was fabricated by coating
the gold nanocomposite on the tip of an optical
fiber. A hydrophone was used as the fiber optic
ultrasound receiver.
4.The ultrasound images were obtained by
scanning the transducer mechanically. This
poster demonstrates the ultrasound imaging
capability of the fiber optic ultrasound
transducer by using a chicken wing target.
0.16
3
2
2
19.89 mJ/cm
20
1
0
0
-5
-10
-10
-20
(a)
-11
-10
-9
Time (s)
-8
-15
0
-7
5
10
15
Frequency
(b)
20
25
Fig. 2 (a) The generated photoacoustic ultrasound with pressure 88 kPa. (b)
The bandwidth is wider than 20 MHz .
-20
2
1.2 mm
Focal point
1
(b)
0.78
-1
0
1
2
-10
0
-2
0 mm
-1
0
0
1
2
Lateral Position (mm)
Results: ultrasound imaging
Nanosecond
laser
3-axis moving
stage
Coupler
Photoacoustic
generator
Hydrophone
DAQ
Chicken wing
Fig. 4 The schematic diagram of the experimental setup of the B-mode
ultrasound imaging using a chicken wing as the target.
 A nanosecond laser (Surelite SL I-10,
Continuum) was used as the
excitation source.
 A hydrophone (HGL-0200, Onda)
was used to collect acoustic signals
and to transmit signals to a data
acquisition system (DAQ) (M2i.4032,
Spectrum).
 The DAQ system was trigged by a
trigger signal from the laser.
 The hydrophone and the fiber optic
ultrasound generator were mounted
on a 3-axis moving stage (NRT100,
Thorlabs) in order to scan ultrasound
images.
Contact
*Xingwei Wang (Vivian), Ph.D., Associate Professor
Department of Electrical and Computer Engineering
Center for Photonics, Electromagnetics, and Nanoelectronics (CPEN)
University of Massachusetts Lowell, Ball Hall, Room 403
One University Ave., Lowell, MA 01854
Tel: 978-934-1981 FAX: 978-934-3027
[email protected] http://faculty.uml.edu/xwang/
3
 The ultrasonic field was acquired within a
rectangular area (5.0 mm by 4.0 mm) with
the resolution of 0.1 mm by the scanning
hydrophone.
Trigger signal
1. Xiaotian Zou, Nan Wu, Ye Tian, and Xingwei Wang, "Broadband miniature
fiber optic ultrasound generator", Optics Express, 22(15),
2. Nan Wu, et al. "High-efficiency optical ultrasound generation using one-pot
synthesized polydimethylsiloxane-gold nanoparticle nanocomposite",
Journal of the Optical Society of America B, 29(8), 2016-2020 2012.
3. Xiaotian Zou, Tyler Schmitt, David Perloff, Nan Wu, Tzu-Yang Yu, and
Xingwei Wang, "Nondestructive corrosion detection using fiber optic
photoacoustic ultrasound generator", Measurement, 2014
0.62
-30
Fig. 3 Ultrasonic field distribution in a longitudinal section
generated from fiber optic ultrasound generator. (a) Pressure
distribution of ultrasonic field. (b) Normalized magnitude
distribution of ultrasonic field [1].
10
5
Focal area
Lateral Position (mm)
15
10
0.47
-40
4
(a)
Fig. 1 (a) A photo of the photoacoustic generation experimental setup. (b)
Gold nanocomposite coated fiber tip [1-3].
30
0.31
5
Fig. 5 The ultrasound image of the chicken wing.
The project was partially supported by National Science Foundation Grant
NSF: CMMI-1055358 (Career award)
Normalized Magnitude (dB)
4
0
-2
Water
References
0
Axial Position (mm)
(a)
Gold nanocomposite
film (125.5 μm in thickness)
5
Amptitude (MPa)
MMF
(b)
Axial Position (mm)
Results: ultrasonic field distribution
dB
1.This poster presents the design, fabrication
and characterization of a fiber optic ultrasound
transducer based on photoacoustic (PA)
ultrasound generation principle for biomedical
ultrasound imaging applications.
Voltage (mV)
Objectives