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11 June 1985 A Comparison Of Ultrasound Dynamic Focus Phased Arrays With Fixed Focus Mechanical Scanners
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Six real time units were compared in this study. Three units were mechanical sector scanners operating at 5. MHz or 7.5 MHz. Two phased arrays (one 3.5 MHz unit with dynamic focussing, and the other a fixed focus 5. MHz array) and a 5. MHz annular array were also tested. Two test objects were imaged: an anthropomorphic breast phantom and a gray scale test object with renal calculi, Thirty-seven images were evaluated by three radiologists specializing in ultrasound. They concluded that; 1) Even the most expensive 3.5 MHz dynamically focussed phased array could not compete with a 7.5 MHz or 5 MHz mechanical sector for imaging small structures in the 1. to 5. cm near the transducer; 2) Mechanical sector real time units whose focal zone is adjusted with a water bag do not produce images equivalent to the images produced by a phased array with dynamic focussing; 3) The cost of the unit is no guide to the quality of the image; 4) Sector images have more digital scan convertor mapping errors than rectangular images. This applies to both phased arrays and mechanical sectors.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Carolyn Kimme-Smith, James Winter, William King III, and Nancy Worthen "A Comparison Of Ultrasound Dynamic Focus Phased Arrays With Fixed Focus Mechanical Scanners", Proc. SPIE 0535, Application of Optical Instrumentation in Medicine XIII, (11 June 1985);

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