Qifa Zhou

Summary

Affiliation: University of Southern California
Country: USA

Publications

  1. pmc Development of integrated preamplifier for high-frequency ultrasonic transducers and low-power handheld receiver
    Hojong Choi
    National Institutes of Health Resource Center for Medical Ultrasonic Transducer Technology and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 58:2646-58. 2011
  2. ncbi request reprint PMN-PT single crystal, high-frequency ultrasonic needle transducers for pulsed-wave Doppler application
    Qifa Zhou
    NIH Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 54:668-75. 2007
  3. ncbi request reprint Development of a 35-MHz piezo-composite ultrasound array for medical imaging
    Jonathan M Cannata
    NIH Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 53:224-36. 2006
  4. pmc Simultaneous functional photoacoustic and ultrasonic endoscopy of internal organs in vivo
    Joon Mo Yang
    Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St Louis, St Louis, Missouri, USA
    Nat Med 18:1297-1302. 2012
  5. pmc Micromachined high frequency PMN-PT/epoxy 1-3 composite ultrasonic annular array
    Changgeng Liu
    Geospace Research, Inc, 525 South Douglas Street, Suite 290, El Segundo, CA, USA
    Ultrasonics 52:497-502. 2012
  6. pmc High frequency photoacoustic imaging for in vivo visualizing blood flow of zebrafish heart
    Jinhyoung Park
    NIH Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, USA
    Opt Express 21:14636-42. 2013
  7. pmc A 2.5-mm diameter probe for photoacoustic and ultrasonic endoscopy
    Joon Mo Yang
    Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St Louis, Campus Box 1097, One Brookings Drive, St Louis, Missouri 63130, USA
    Opt Express 20:23944-53. 2012
  8. pmc Development of lead-free single-element ultrahigh frequency (170-320MHz) ultrasonic transducers
    Kwok Ho Lam
    Department of Biomedical Engineering and NIH transducer Resource Center, University of Southern California, Los Angeles, CA 90089 1111, USA
    Ultrasonics 53:1033-8. 2013
  9. pmc Thermal-independent properties of PIN-PMN-PT single-crystal linear-array ultrasonic transducers
    Ruimin Chen
    NIH Resource Center for Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 59:2777-84. 2012
  10. pmc Micro-machined high-frequency (80 MHz) PZT thick film linear arrays
    Qifa Zhou
    Resource Center for Medical Ultrasonic Transducer Technology, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 57:2213-20. 2010

Collaborators

Detail Information

Publications36

  1. pmc Development of integrated preamplifier for high-frequency ultrasonic transducers and low-power handheld receiver
    Hojong Choi
    National Institutes of Health Resource Center for Medical Ultrasonic Transducer Technology and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 58:2646-58. 2011
    ..57 mW. Pulse-echo responses and wire phantom images with a single-element ultrasonic transducer have been acquired to demonstrate the performance of the front-end circuit...
  2. ncbi request reprint PMN-PT single crystal, high-frequency ultrasonic needle transducers for pulsed-wave Doppler application
    Qifa Zhou
    NIH Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 54:668-75. 2007
    ..In vivo high-frequency, pulsed-wave Doppler patterns of blood flow in the posterior portion and in vitro ultrasonic backscatter microscope (UBM) images of the rabbit eye were obtained with the 44-MHz needle transducer...
  3. ncbi request reprint Development of a 35-MHz piezo-composite ultrasound array for medical imaging
    Jonathan M Cannata
    NIH Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 53:224-36. 2006
    ..An image of a tungsten wire target phantom was acquired using a synthetic aperture reconstruction algorithm. The results from this imaging test demonstrate resolution exceeding 50 microm axially and 100 microm laterally...
  4. pmc Simultaneous functional photoacoustic and ultrasonic endoscopy of internal organs in vivo
    Joon Mo Yang
    Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St Louis, St Louis, Missouri, USA
    Nat Med 18:1297-1302. 2012
    ..Here we present simultaneous photoacoustic and ultrasonic dual-mode endoscopy and show its ability to image internal organs in vivo, thus illustrating its potential clinical application. ..
  5. pmc Micromachined high frequency PMN-PT/epoxy 1-3 composite ultrasonic annular array
    Changgeng Liu
    Geospace Research, Inc, 525 South Douglas Street, Suite 290, El Segundo, CA, USA
    Ultrasonics 52:497-502. 2012
    ..5 dB at 50 MHz and the crosstalk between adjacent elements was about -35 dB. The micromachining techniques described in this paper are promising for the fabrication of other types of high frequency transducers, e.g. 1D and 2D arrays...
  6. pmc High frequency photoacoustic imaging for in vivo visualizing blood flow of zebrafish heart
    Jinhyoung Park
    NIH Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, USA
    Opt Express 21:14636-42. 2013
    ..Carbon nanotubes were utilized as contrast agents to increase the flow signal level by 20dB in phantom studies, and zebrafish heart blood flow was successfully observed. ..
  7. pmc A 2.5-mm diameter probe for photoacoustic and ultrasonic endoscopy
    Joon Mo Yang
    Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St Louis, Campus Box 1097, One Brookings Drive, St Louis, Missouri 63130, USA
    Opt Express 20:23944-53. 2012
    ....
  8. pmc Development of lead-free single-element ultrahigh frequency (170-320MHz) ultrasonic transducers
    Kwok Ho Lam
    Department of Biomedical Engineering and NIH transducer Resource Center, University of Southern California, Los Angeles, CA 90089 1111, USA
    Ultrasonics 53:1033-8. 2013
    ..The transducer performance presented in this work is shown to be better or comparable to previously reported results even though the frequency is much higher...
  9. pmc Thermal-independent properties of PIN-PMN-PT single-crystal linear-array ultrasonic transducers
    Ruimin Chen
    NIH Resource Center for Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 59:2777-84. 2012
    ..The results suggest that the potential of PIN-PMN-PT linear-array ultrasonic transducers for high-temperature ultrasonic transducer applications is promising...
  10. pmc Micro-machined high-frequency (80 MHz) PZT thick film linear arrays
    Qifa Zhou
    Resource Center for Medical Ultrasonic Transducer Technology, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 57:2213-20. 2010
    ..Experimental measurements show that the array had a center frequency of 80 MHz and a fractional bandwidth (-6 dB) of 60%. An insertion loss of -41 dB and adjacent element crosstalk of -21 dB were found at the center frequency...
  11. pmc Elevated electrochemical impedance in the endoluminal regions with high shear stress: implication for assessing lipid-rich atherosclerotic lesions
    Fei Yu
    Department of Biomedical Engineering and Cardiovascular Medicine, University of Southern California, Los Angeles, CA 90089, USA
    Biosens Bioelectron 43:237-44. 2013
    ..We hereby assessed whether integrating EIS with intravascular ultrasound (IVUS) and shear stress (ISS) provided a new strategy to assess oxLDL-laden lesions in the fat-fed New Zealand White (NZW) rabbits...
  12. pmc Optimal ultraviolet wavelength for in vivo photoacoustic imaging of cell nuclei
    Da Kang Yao
    Washington University in St Louis, Department of Biomedical Engineering, St Louis, MO 63130, USA
    J Biomed Opt 17:056004. 2012
    ..Besides the optimal wavelength, application of a wavelength between 245 and 275 nm can produce in vivo images of cell nuclei with specific, positive, and high optical contrast...
  13. pmc Real-time four-dimensional optical-resolution photoacoustic microscopy with Au nanoparticle-assisted subdiffraction-limit resolution
    Bin Rao
    Department of Biomedical Engineering, Optical Imaging Lab, Washington University in St Louis, Campus Box 1097, One Brookings Drive, St Louis, Missouri 63130 4899, USA
    Opt Lett 36:1137-9. 2011
    ..The corresponding 2D B-scan (50 A-lines) frame rate was 1800 Hz, and the one-dimensional A-scan rate was 90,000 Hz. The lateral resolution is 0.23 ± 0.03 μm for Au nanowire imaging, which is 2.0 times below the diffraction limit...
  14. ncbi request reprint Determining the acoustic properties of the lens using a high-frequency ultrasonic needle transducer
    Chih Chung Huang
    National Institutes of Health Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
    Ultrasound Med Biol 33:1971-7. 2007
    ..Finally, the data obtained demonstrate that regional variations in the acoustic properties of lenses corresponding to the hardness of different types of cataract can be detected sensitively by a needle transducer...
  15. pmc Investigating contactless high frequency ultrasound microbeam stimulation for determination of invasion potential of breast cancer cells
    Jae Youn Hwang
    Department of Biomedical Engineering, University of Southern California, Los Angeles, California 90089, USA
    Biotechnol Bioeng 110:2697-705. 2013
    ..These results suggest that HFUMS may serve as a novel tool to determine the invasion potential of breast cancer cells, and with further refinement may offer a rapid test for invasiveness of tumor biopsies in situ...
  16. pmc Design and fabrication of broadband graded ultrasonic transducers with rectangular kerfs
    Hongkai Guo
    National Institutes of Health Transducer Resource Center and Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089 1451, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 52:2096-102. 2005
    ..A superior bandwidth of 92% was achieved by the graded transducer when compared to a bandwidth of 56% produced by the nondiced ceramic transducer at the expense of a reduced sensitivity...
  17. pmc Pulse inversion chirp coded tissue harmonic imaging (PI-CTHI) of Zebrafish heart using high frame rate ultrasound biomicroscopy
    Jinhyoung Park
    NIH Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, 1042 Downey Way, University Park, DRB125, Los Angeles, CA 90089, USA
    Ann Biomed Eng 41:41-52. 2013
    ..Disappearance of the clots in the early stages of the regeneration has been observed for 7 days without sacrificing the fish...
  18. pmc 80-MHz intravascular ultrasound transducer using PMN-PT free-standing film
    Xiang Li
    NIH Ultrasonic Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 58:2281-8. 2011
    ..The imaging results suggest that PMN-PT free-standing thin film technology is a feasible and efficient way to fabricate very-high-frequency ultrasonic transducers...
  19. pmc Very high frequency (beyond 100 MHz) PZT kerfless linear arrays
    Da Wei Wu
    NIH Center for Ultrasonic Transducer Technol, Univ of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 56:2304-10. 2009
    ..The PZT ceramic sheet array was found to have a center frequency of 128 MHz with a poorer bandwidth (40% with a parylene matching layer) but a better sensitivity (28 dB insertion loss)...
  20. pmc Intravascular photoacoustic imaging at 35 and 80 MHz
    Xiang Li
    NIH Ultrasonic Transducer Resource Center, Department of Biomedical Engineering, University of Southern California, Los Angeles, California 90089, USA
    J Biomed Opt 17:106005. 2012
    ..Healthy rabbit aorta was imaged in vitro. Imaging results show that IVPA has superior contrast over IVUS in identifying the arterial wall, and IVPA at 80 MHz demonstrates extraordinary resolution (35 μm) compared to 35 MHz...
  21. pmc Integrated intravascular optical coherence tomography ultrasound imaging system
    Jiechen Yin
    University of California, Irvine, Department of Biomedical Engineering, Irvine, California 92697University of Southern California, NIH Transducer Resource Center and Department of Biomedical Engineering, Los Angeles, California 90089 1111University of California, Irvine, Beckman Laser Institute, 1002 Health Sciences Road East, Irvine, California 92612
    J Biomed Opt 15:010512. 2010
    ..This study demonstrates the feasibility of an OCT-US system for intravascular imaging, which is expected to have a prominent impact on early detection and characterization of atherosclerosis...
  22. pmc Combined chirp coded tissue harmonic and fundamental ultrasound imaging for intravascular ultrasound: 20-60 MHz phantom and ex vivo results
    Jinhyoung Park
    NIH Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, USA
    Ultrasonics 53:369-76. 2013
    ..These results clearly indicate that CPI-CTHI may enhance tissue contrast with less range side lobe level than PI-CTHI...
  23. pmc Alumina/epoxy nanocomposite matching layers for high-frequency ultrasound transducer application
    Qifa Zhou
    Department of Biomedical Engineering and NIH transducer Resource Center, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 56:213-9. 2009
    ..The attenuation of a nanocomposite matching layer with smooth surface is about 15 dB/mm at 40 MHz. The pulse-echo spectrum and frequency spectrum of a high-frequency transducer using this nanocomposite matching layer are reported...
  24. pmc Photoacoustic ophthalmoscopy for in vivo retinal imaging
    Shuliang Jiao
    Department of Ophthalmology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
    Opt Express 18:3967-72. 2010
    ..The capabilities of this novel technology were demonstrated by imaging both the microanatomy and microvasculature of the rat retina in vivo...
  25. doi request reprint Systematic study of high-frequency ultrasonic transducer design for laser-scanning photoacoustic ophthalmoscopy
    Teng Ma
    University of Southern California, Department of Biomedical Engineering, Los Angeles, California 90033
    J Biomed Opt 19:16015. 2014
    ..Transducers of various designs were successfully applied for capturing images of biological samples in vivo. The performances of these designs are compared and evaluated. ..
  26. doi request reprint Integrated intravascular optical coherence tomography (OCT) - ultrasound (US) catheter for characterization of atherosclerotic plaques in vivo
    Jiawen Li
    Department of Biomedical Engineering, University of California, Irvine, Irvine, CA 92697, USA
    Conf Proc IEEE Eng Med Biol Soc 2012:3175-8. 2012
    ..In addition, in vitro imaging of cadaver coronary arteries were conducted to demonstrate the imaging capabilities of this integrated catheter to classify different atherosclerotic plaque types...
  27. pmc Ultrasonic Doppler measurements of blood flow velocity of rabbit retinal vessels using a 45-MHz needle transducer
    Naoki Matsuoka
    Doheny Retina Institute, Los Angeles, CA, USA
    Graefes Arch Clin Exp Ophthalmol 248:675-80. 2010
    ..The purpose of this study is to measure blood flow velocity of rabbit retinal vessels using a 45-MHz ultrasonic Doppler system with a needle transducer...
  28. ncbi request reprint Coded excitation using biphase-coded pulse with mismatched filters for high-frequency ultrasound imaging
    Chang Hong Hu
    Biomedical Engineering Department and NIH Transducer Resource Center, University of Southern California, Los Angeles, CA 90089, USA
    Ultrasonics 44:330-6. 2006
    ..The experimental results showed about 14 dB SNR improvement as well as -40 dB sidelobe level when the Barker-13 code excitation with 3-cycle sinusoidal wave carrier was used...
  29. doi request reprint Evaluation of breast tumor margins in vivo with intraoperative photoacoustic imaging
    Lei Xi
    Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA
    Opt Express 20:8726-31. 2012
    ..The MEMS imaging probe is small and has the potential to be conveniently used to guide surgical resection of tumors in the breast...
  30. pmc In vivo label-free photoacoustic microscopy of cell nuclei by excitation of DNA and RNA
    Da Kang Yao
    Department of Biomedical Engineering, Washington University in St Louis, St Louis, Missouri 63130, USA
    Opt Lett 35:4139-41. 2010
    ..Given intrinsic optical contrast and high spatial resolution, in vivo label-free UV-PAM has potential for unique biological and clinical application...
  31. doi request reprint Micro-electrocardiograms to study post-ventricular amputation of zebrafish heart
    Ping Sun
    Department of Biomedical Engineering and Division of Cardiovascular Medicine, University of Southern California, Los Angeles, CA, USA
    Ann Biomed Eng 37:890-901. 2009
    ..Taken together, we demonstrated a minimally invasive methodology to monitor zebrafish heart function, electrical activities, and regeneration in real-time...
  32. doi request reprint Ultrahigh frequency lensless ultrasonic transducers for acoustic tweezers application
    Kwok Ho Lam
    NIH Transducer Resource Center and Department of Biomedical Engineering, University of Southern California, Los Angeles, California 90089, USA
    Biotechnol Bioeng 110:881-6. 2013
    ....
  33. pmc Photoacoustic endoscopy
    Joon Mo Yang
    Department of Biomedical Engineering, Optical Imaging Laboratory, Washington University in St Louis, Campus Box 1097, One Brookings Drive, St Louis, Missouri 63130 4899, USA
    Opt Lett 34:1591-3. 2009
    ..Biological tissues, including the gastrointestinal tract of a rat, have been imaged ex vivo or in situ...
  34. pmc Structure and electrical properties of (111)-oriented Pb(Mg1/3Nb2/3)O3-PbZrO3-PbTiO3 thin film for ultra-high-frequency transducer applications
    Ben Peng Zhu
    NIH Transducer Resource Center and the Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
    IEEE Trans Ultrason Ferroelectr Freq Control 58:1962-7. 2011
    ..When the Pt electrode was biased positively, the conduction current curve showed an ohmic behavior at a low electric field and space-charge-limited current characteristics at a high electric field...
  35. pmc Design and fabrication of PZN-7%PT single crystal high frequency angled needle ultrasound transducers
    Qifa Zhou
    IEEE Trans Ultrason Ferroelectr Freq Control 55:1394-9. 2008
    ..The two-way insertion loss was approximately 17 dB. Wire phantom imaging using fabricated PZN-7%PT single crystal transducers was obtained and spatial resolutions were assessed...
  36. ncbi request reprint Acoustic properties of alumina colloidal/polymer nano-composite film on silicon
    Rui Zhang
    IEEE Trans Ultrason Ferroelectr Freq Control 54:467-9. 2007
    ....