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Proceedings Paper

Real Time Two-Dimensional Mechanical Ultrasonic Sector Scanner With Electronic Control Of Sector Width
Author(s): William H. Schuette; George F. Norris; John L. Doppman
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Paper Abstract

The simplicity of the mechanical real-time ultrasonic sector scanner makes it an attractive device for medical diagnosis. A new scanner has been developed that incorporates electronic position control of the transducer; thus permitting electronic programming of scan linearity and sector width. The system employs a reversible low-inertia servo motor that moves the transducer by means of a three-to-one gear reduction. The use of the gear reduction enables the transducer rotational inertia to be counterbalanced by that of the motor, thus reducing the mechanical vibration of the system. Sine and cosine voltages necessary for display purposes are generated photoelectrically from a rotating disc mounted on the rear of the motor shaft. Curved slits in the disc are machined to permit light intensity proportional to the sine and cosine of the sector position to reach the detector. The gear reduction to the transducer was accounted for in the calculations of the slit geometry. A coil spring attached to the motor shaft was selected for a system mechanical resonance of approximately 10 Hz in order to reduce the electrical power consumed by the system. The sine voltage from the scanner is employed as a position signal for the feedback control. With this system, the sector size may be adjusted from 0 to ± 25 degrees.

Paper Details

Date Published: 23 December 1976
PDF: 4 pages
Proc. SPIE 0096, Application of Optical Instrumentation in Medicine V, (23 December 1976); doi: 10.1117/12.965436
Show Author Affiliations
William H. Schuette, National Institutes of Health (United States)
George F. Norris, National Institutes of Health (United States)
John L. Doppman, National Institutes of Health (United States)


Published in SPIE Proceedings Vol. 0096:
Application of Optical Instrumentation in Medicine V
Robert K. Cacak; Paul L. Carson; Gregory Dubuque; Joel E. Gray; William R. Hendee; Raymond P. Rossi; Arthur Haus, Editor(s)

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