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Takashi Buma
Assistant Professor
Department of Electrical and Computer Engineering   
209 Steinmetz
Union College
Schenectady, NY 12308
Phone: 518-388-6334
Email: bumat@union.edu
 
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Teaching

·        ECE 363 – Design of Electronic Circuits (F11, F12, F13)

·        BNG 386 – Biomedical Instrumentation (W12, W13, W14)

·        ECE 248 – Semiconductor Devices and Circuits (S12, S13, S14)

·        BNG/ECE 487 –Medical Imaging Systems (S12, S14)


 

Research

 

Biomedical Ultrasonics and Biophotonics Laboratory (BUBL)

 

Location: 320 Butterfield Hall

 

 ·         Research Areas:

1)    Ultrasound Biomicroscopy (UBM)

UBM employs high frequency ultrasound to produce high resolution images of tissue microstructure. However, the lack of suitable sensor arrays has prevented UBM from making the leap to widespread clinical use.  We are developing UBM systems based on “optoacoustic” sensor technology. The basic idea is to detect ultrasound with optical interferometric techniques instead of conventional piezoelectric technology. This project has two major research aims: (1) develop broadband, large aperture, and highly populated optoacoustic sensor arrays (2) integrate these optoacoustic arrays into real-time UBM imaging systems.

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2)    Photoacoustic Microscopy (PAM)

 

PAM provides high resolution images with excellent image contrast based on optical absorption. A laser pulse illuminates tissue, where optically absorbing regions emit ultrasound by thermoelastic expansion. The detected ultrasound waves are processed to reconstruct the location of the optically absorbing regions. We are developing high repetition rate and tunable optical sources suitable for spectroscopic PAM. Pulses from a high repetition rate Q-switched Nd:YAG microchip laser are sent through an optical fiber. Four wave mixing in a photonic crystal fiber produces a supercontinuum spectrum spanning 500 to 1300 nm. Stimulated Raman scattering in a single mode fiber produces a series of Stokes wavelengths from 532 to 604 nm. PAM images taken at different excitation wavelengths can be processed to distinguish objects of different color.

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3)    Optical Coherence Tomography (OCT)

 

OCT is an emerging technique for high resolution biomedical imaging. Advantages include fine spatial resolution (better than 10 um laterally and 7 um axially), portability, cost effectiveness, and miniaturization into arthroscopic devices for minimally invasive imaging. Unlike histology, OCT can produce thinly sliced cross-sectional images without physically cutting tissue. OCT typically has a penetration depth of about 1 mm in tissue, which is limited by optical scattering. We have developed a spectral domain OCT (SD-OCT) system with the eventual goal of integrating it with our PAM system. This multimodality system will combine the structural imaging capabilities of OCT with the functional imaging capabilities of PAM.

 

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·         Research Members:

 

o   Class of 2016

  

Htoo Wai Htet

(EE & CS)

 

  

o   Class of 2015

 

Kristofer Hammer

(BNG)

Dani Liu

(EE)

Tim Sheehan

(BNG)

 

Ben Wilkinson

(BNG)

 

o   Class of 2014

 

Azmi Ahmad

(BNG)

Kim Derosier

(BNG)

Vishnu Dosakayala

(CpE)

 

J. P. Dumas

(BNG)

Amy Loya

(BNG)

Ryan Mohr

(EE)

 

 

o   Class of 2013

 

 

Shaun Gordon

(EE)

Dan Hernandez

(EE)

Amin Meyghani

(EE)

 

 

 


·         BUBL Publications and Conference Presentations (* denotes Union students)

o   B. C. Wilkinson*, T. C. Sheehan*, and T. Buma, “Spectroscopic photoacoustic microscopy in the 1064-1300 nm range using a pulsed multi-color source based on stimulated Raman scattering,” IEEE International Ultrasonics Symposium, Chicago, USA, Sep. 2014. [Oral]

 

o   K. J. Hammer* and T. Buma, “Microsphere resonator for optoacoustic detection of high frequency ultrasound,” IEEE International Ultrasonics Symposium, Chicago, USA, Sep. 2014. [Oral]

 

o   Pelivanov, T. Buma, J. Xia, C.-W. Wei, M. O’Donnell, “NDT of fiber-reinforced composites with a new fiber-optic pump-probe laser-ultrasound system”, Photoacoustics, Vol. 2, pp. 63-74 (2014). \

 

o   Pelivanov, T. Buma, J. Xia, C.-W. Wei, M. O’Donnell, “A new fiber-optic non-contact compact laser-ultrasound scanner for fast non-destructive testing and evaluation of aircraft composites”, J. Appl. Phys., Vol. 115 (11), 113105 (2014).

 

o   Ashok Ramasubramanian, Quynh B. ChuLaGraff, Takashi Buma, Kevin T. Chico*, Meagan E. Carnes*, Kyra R. Burnett*, Sarah A. Bradner*, and Shaun S. Gordon*. "On the role of intrinsic and extrinsic forces in early cardiac slooping." Developmental Dynamics (2013).

 

o   A. K. Loya*, J. P. Dumas*, and T. Buma, “Dual-wavelength photoacoustic microscopy at 532 and 1064 nm with a cost-effective microchip laser,” Biomedical Engineering Society (BMES) Annual Meeting, Seattle, WA (2013). [Poster]

 

o   J. P. Dumas*, A. K. Loya*, and T. Buma, “High speed dual-wavelength photoacoustic microscopy with an acousto-optic tunable filter,” Biomedical Engineering Society (BMES) Annual Meeting, Seattle, WA (2013). [Poster]

 

o   A. K. Loya*, J. P. Dumas*, D. Koeplinger, and T. Buma, “Photoacoustic microscopy with a multi-color laser source based on stimulated Raman scattering and four-wave mixing,” Biomedical Engineering Society (BMES) Annual Meeting, Atlanta, GA (2012). [Poster]

 

o   A. K. Loya*, J. P. Dumas*, and T. Buma, “Photoacoustic microscopy with a tunable source based on a large mode-area photonic crystal fiber,” IEEE International Ultrasonics Symposium, Dresden, Germany, Oct. 2012. [Oral]

Phone:  (518) 388-6334 (Office)
Email:   bumat@union.edu

Last updated 09/17/14