PubMed · 13264521
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K RITTER, G BORNMANN, A LOESER. 1955-08-15. [General metabolism and troiodthyronine].. https://doi.org/10.1007/bf01473510
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A removable ultrasonic collimator is described. It could be easily attached to a general purpose transducer to improve resolution on ultrasound study of superficial small organs. The collimator is made of a small central focusing lens, 6 mm in diameter, surrounded by air. The air insulates the peripheral portion of the transducer surface. ONLY THE CENTRAL ULTRASONIC BEAM WOULD BE TRANSMITTED THROUGH THE LENS. As a result, the ultrasonic beam is narrowed and the resolution is improved. Draw-back of the collimator is a reduction in the ultrasound intensity. However, it can be compensated for by increasing either the transducer output or system gain.
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