26 December 1979 Charge-Coupled-Device-Based Dynamically Focused Electronic Sector Scanner
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Abstract
This paper discusses the development of a new phased array sector scanner at Picker Corporation. Among its features are 256 sector lines in a 90° sector with a fixed transmit focus and a dynamic receive focus. Several sector angles are available. Charge-coupled devices (CCD's) are used as delay elements under control of a microprocessor and PROM memories. In the past dynamically focussed systems have used digitally switchable LC delay lines or CCD's driven by exponentially swept VCO's to cause the receive focus move with the receding acoustic wavefront. The present system uses a digitally controlled feedback stabilized frequency generator to establish the clocking frequencies for the CCD's. The numerical control sequence for this generator is designed to minimize the delay error accrued by the signal as it traverses the CCD. The quality of the beam formation is demonstrated by results of tank tests.
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Kai E. Thomenius, Kai E. Thomenius, Seeley C. Kellogg, Seeley C. Kellogg, Richard Bernardi, Richard Bernardi, } "Charge-Coupled-Device-Based Dynamically Focused Electronic Sector Scanner", Proc. SPIE 0206, Recent and Future Developments in Medical Imaging II, (26 December 1979); doi: 10.1117/12.958190; https://doi.org/10.1117/12.958190
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