Advances in two dimensional arrays for real time 3D intravascular ultrasound

We have previously described 2D array transducers for forward looking real time 3D intravascular ultrasound (IVUS). We developed two forward-viewing transducers. The first is a 14 French catheter transducer intended to guide the placement and retrieval of devices in the peripheral vessels. It operates at 5 MHz and features 112 active channels in a 10/spl times/14 array. This transducer was originally designed for intracardiac echo applications. The second is a 5 French catheter transducer for use in smaller vessel. It operates at 10 MHz. and the array is 11/spl times/11. Our earlier processes led to poor yield and image quality. A new process, based on a custom fixture, improved the flatness of the wireguide. This improved our bonding and dicing techniques and increased our yield by 50%. Real time 3D images have been obtained from both phantoms and actual hearts. We have also pursued the fabrication of another 2D array transducer that was constructed with non-rectilinear element placement. Using the same cabling, 61 elements were diced out with a laser. Preliminary pulse and spectrum show a -6 dB bandwidth of 55% centered at 13 MHz.

[1]  D.N. Stephens,et al.  Optimizing the beam pattern of a forward-viewing ring-annular ultrasound array for intravascular imaging , 2002, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[2]  F Prati,et al.  Usefulness of on-line three-dimensional reconstruction of intracoronary ultrasound for guidance of stent deployment. , 1996, The American journal of cardiology.

[3]  Francesco Prati,et al.  Three dimensional reconstruction of cross sectional intracoronary ultrasound: clinical or research tool? , 1995, British heart journal.

[4]  S.W. Smith,et al.  A micromachine high frequency ultrasound scanner using photolithographic fabrication , 2002, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[5]  Patrick D Wolf,et al.  Dual lumen transducer probes for real-time 3-D interventional cardiac ultrasound. , 2003, Ultrasound in medicine & biology.

[6]  R C Chan,et al.  Ultrasound cardioscopy: embarking on a new journey. , 1996, Mayo Clinic proceedings.

[7]  M. O’Donnell,et al.  Initial results from a forward-viewing ring-annular ultrasound array for intravascular imaging , 2003, IEEE Symposium on Ultrasonics, 2003.

[8]  Edward D. Light,et al.  Two Dimensional Arrays for Real Time 3D Intravascular Ultrasound , 2004 .

[9]  Paul G. Yock,et al.  Intravascular ultrasound: development and clinical potential , 1988 .

[10]  Michael J. Vonesh,et al.  Arterial Imaging With a New Forward‐Viewing Intravascular Ultrasound Catheter, I: Initial Studies , 1994, Circulation.

[11]  N Bom,et al.  An ultrasonic intracardiac scanner. , 1972, Ultrasonics.

[12]  W N McDicken,et al.  Three-dimensional forward-viewing intravascular ultrasound imaging of human arteries in vitro. , 2001, Ultrasound in medicine & biology.

[13]  R. E. Davidsen,et al.  Progress in Two-Dimensional Arrays for Real-Time Volumetric Imaging , 1998, Ultrasonic imaging.

[14]  L. J. Busse,et al.  Sparse circular array methods, performance, and application to intravascular imaging , 1991, IEEE 1991 Ultrasonics Symposium,.

[15]  F. L. Degertekin,et al.  Fabrication and characterization of cMUTs for forward looking intravascular ultrasound imaging , 2003, IEEE Symposium on Ultrasonics, 2003.