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DESIGN OF A LOW PROFILE CONFORMAL ARRAY FOR TRANSCRANIAL ULTRASOUND IMAGING

Smiley, Aref
http://rave.ohiolink.edu/etdc/view?acc_num=csu1525860103122672

Abstract Details

2018, Doctor of Engineering, Cleveland State University, Washkewicz College of Engineering.
A “belt-type” conformal transducer array designed transcranial brain imaging has been investigated. In precursory simulation work it was estimated that an array consisting of approximately 500 channels would be sufficient to achieve two-dimensional brain imaging utilizing a tomographic approach valid on irregular boundaries [1], such as the human head. To achieve such an array in practice a transducer designed and constructed around an assembly of rigid 1-3 composite planar sub-arrays (500 kHz, 1-3 random-fiber, 20mm X 20mm) consisting of 19 elements. Sub-arrays are bonded to custom-printed circuit boards wired to shielded ribbon cable. The full transducer is created by UV bonding the electrodes to a flexible 3D-printed head band. Element performance is assessed by underwater scanned hydrophone characterization in the far-field. Measurements are then numerically back-projected to the transducer face to assess isolation. It is determined that elements function independently with little impact on the nearby elements. The maximum measured pressure amplitude crosstalk of the neighboring elements to the active element is less than -14 dB, which satisfies the later tomography imaging requirements. Results also show a maximum 3 dB decrease in the pressure amplitude as referenced to the maximum pressure amplitude of elements. Due to the limited number of channels on the data and control acquisition system (N = 128), an expander was designed and fabricated using 4:1 multiplexers (MUXs) to cover all the required number of transducer elements for the imaging system. The electrical characterization of the expander was addressed in terms of noise and crosstalk. Results show ae crosstalk of about -58.7 ± 2.9 dB for the MUXs. Average signal to noise ratio (SNR) decreased by about 0.05 dB after adding the expander. Noise level remained almost the same after increasing the average detected signal power. Overall, the design and measured results are found to satisfy the key transducer requirements for a conformal array designed for transcranial diffraction tomography. This “work in progress” will be combined with an optical registration technique to form a complete imaging device.
Gregory Clement, Dr. (Committee Chair)
Dan Simon, Dr. (Advisor)
Aaron Fleischman, Dr. (Committee Member)
Chandra Kothapalli, Dr. (Committee Member)
Petru Fodor, Dr. (Committee Member)
165 p.
Biomedical Engineering; Design; Engineering
Brain imaging; Ultrasound; Single frequency diffraction tomography; Transducer; array fabrication

Recommended Citations

Citations

  • Smiley, A. (2018). DESIGN OF A LOW PROFILE CONFORMAL ARRAY FOR TRANSCRANIAL ULTRASOUND IMAGING [Doctoral dissertation, Cleveland State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=csu1525860103122672

    APA Style (7th edition)

  • Smiley, Aref. DESIGN OF A LOW PROFILE CONFORMAL ARRAY FOR TRANSCRANIAL ULTRASOUND IMAGING. 2018. Cleveland State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=csu1525860103122672.

    MLA Style (8th edition)

  • Smiley, Aref. "DESIGN OF A LOW PROFILE CONFORMAL ARRAY FOR TRANSCRANIAL ULTRASOUND IMAGING." Doctoral dissertation, Cleveland State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=csu1525860103122672

    Chicago Manual of Style (17th edition)

csu1525860103122672
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© 2018, some rights reserved.Creative Commons License DESIGN OF A LOW PROFILE CONFORMAL ARRAY FOR TRANSCRANIAL ULTRASOUND IMAGING by Aref Smiley is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Cleveland State University and OhioLINK.