A Micromachined Pb(Mg1/3Nb2/3)O3-PbTiO3 Single Crystal Composite Circular Array for Intravascular Ultrasound Imaging
Abstract
This paper describes the design, fabrication, and characterization of a micromachined high-frequency Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) single crystal/epoxy 1–3 composite ultrasound circular array. The 1–3 composites were fabricated by deep reactive ion etching (DRIE) of PMN-PT single crystal. The feature size of single crystal pillars was 18 μm in diameter. The kerf between pillars was less than 4 μm. A 50-element circular array transducer (radially outward) with the pitch of 100 μm was wrapped around a needle resulting in an outer diameter of 1.7 mm. The array test showed that the center frequency reached 39±2 MHz and −6-dB fractional bandwidth was 82±6%. The insertion loss was −41 dB, and crosstalk between adjacent elements was −24 dB. A radial outward imaging testing with phantom wires (D = 50 μm) was conducted. The image was in a dynamic range of 30 dB to show a penetration depth of 6 mm by using the synthetic aperture method. The −6-dB beam width was estimated to be 60 μm in the axial direction at 3.1 mm distance away from the probe. The results suggest that the 40 MHz micromachined 1–3 composite circular array is promising for intravascular ultrasound (IVUS) imaging applications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 18, 2019
- Source ID
- 10.1115/1.4041443
Entities
People
- Jian Tian
- Sibo Li
- Xiaoning Jiang
Organizations
- National Institutes of Health
- National Science Foundation
- North Carolina State University
- United States Army