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Abstract

Synthetic aperture imaging using a catheter based, circular phased array providing high resolution, dynamic focusing has been explored. Due to the high input impedance and low signal-to-noise ratio (SNR) of a classic single element synthetic aperture system, multi-element synthetic aperture processing has been proposed with SNR improvement of about 8 dB for a 33 element aperture. Reconstruction in this case uses an optimal filtering approach based on minimizing the mean square error between filter output and desired beam pattern. This approach, however, does not directly control both mainlobe beamwidth and sidelobe levels. To overcome this problem, a Lagrange based filter design technique has been developed that not only satisfies the minimum energy criterion, but also constrains sidelobe levels under a certain threshold. The new technique provides better spatial and contrast resolution. Both the mathematical formulation and simulation results are presented.

Keywords

Catheter-based imaging circular array Lagrange multiplier medical ultrasound synthetic aperture

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References

Pandian

N.G.

, Intravascular and intracardiac ultrasound imaging: An old concept, now on the road to reality, Circulation 80, 1091–1094 (1989).

Yock

P.G.

Linker

D.T.

, Intravascular ultrasound: Looking below the surface of vascular disease, Circulation 81, 1715–1718 (1990).

Bom

Lancee

C.T.

van Egmond

F.C.

, An ultrasonic intracardiac scanner, Ultrasonics 10, 72–77 (1972).

Bom

ten Hoff

Lancee

C.T.

Gussenhoven

W.J.

Bosch

J.G.

, Early and recent intraluminal ultrasound devices, Int. J. Card. Imaging 4, 79–88 (1989).

Meyer

C.R.

Chiang

E.H.

Fechner

K.P.

Fitting

D.W.

Williams

D.M.

Buda

A.J.

, Feasibility of high-resolution intravascular ultrasonic imaging catheters, Radiology 168, 113–116 (1988).

The entire issue # 4, volume 7 of the journal Echocardiography is devoted to a set of review articles on intravascular and intracardiac ultrasound imaging. Included as the lead article is: Pandian

N.G.

Weintraub

Schwartz

S.L.

Kumar

Kusay

B.S.

Katz

S.E.

Aronovitz

Udelson

Konstam

M.A.

Salem

D.N.

Kreis

, Intravascular and intracardiac ultrasound imaging: current research and future directions, Echocardiography 7, 377–387 (1990).

Schwarz

H.P.

Welsch

H.J.

Becker

Biebinger

Schmitt

R.M.

, Development of a New Ultrasonic Circular Array for Endoscopic Application in Medicine and NDT, in Proc. 1988 IEEE Ultrasonics Symposium 88CH2578-3, 639–642 (1988).

Schwarz

H.P.

Welsch

H.J.

Becker

Biebinger

Schmitt

R.M.

, Development of a new ultrasonic circular array for endoscopic application in medicine and NDT, in Proc. 1989 IEEE Ultrasonics Symposium 89CH2791-2, 687–690 (1989).

O'Donnell

Thomas

L.J.

, Efficient Synthetic Aperture Imaging from a Circular Aperture with Possible Application to Catheter-Based Imaging, IEEE Trans. Ultrason., Ferroelec, and Freq. Contr., 39, 366–380 (1992).

10.

O'Donnell

Engeler

W.E.

Pedicone

J.T.

Itani

A.M.

Noujaim

S.E.

DunkiJacobs

R.J.

Leue

W.M.

Chalek

C.L.

Smith

L.S.

Piel

J.E.

Harris

R.L.

Welles

K.B.

Hinrichs

W.L.

, Real-Time Phased Array Imaging Using Digital Beam Forming and Autonomous Channel Control, in Proc. 1990 IEEE Ultrasonics Symposium, 90CH2938-9, 1499–1502.

11.

Adams

J.W.

, A new optimal window, IEEE Trans, on Sig. Proc., 39, 1753–1769 (1991).

12.

Pai-Chi

Ebbini

O'Donnell

, A New Filter Design Technique for Coded Excitation Systems, to appear in November, 1992 issue of IEEE Trans, on Ultrason., Ferroelec., and Freq. Contr.

13.

Ebbini

Emad

, Deep Localized Hyperthermia with Ultrasound Phased Arrays Using the Pseudoinverse Pattern Synthesis Method, Ph.D Dissertation, (University of Illinois, Urbana, IL, 1990).

Synthetic Aperture Imaging Using a Lagrange Based Filtering Technique

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