ultrasonic diagnosis of ocular pathology: its significance for cataract surgery with and without IOL implantation T. T. Tjan, M.D. Amsterdam, The Netherlands
Any sound with a frequency on the order of millions of cycles per second (megacycles per second) is called ultrasound. A piezoelectric transducer can produce ultrasonic vibrations of several megacycles per second. In a suitable liquid medium' such as saline or methylcellulose solution, the pulses of this transducer are transmitted, causing reflections at the boundaries between media with different acoustic properties. These reflections or echoes are picked up by the same transducer, converted to electrical signals and displayed on a cathode ray oscilloscope. The two methods of ultrasound in use are A-scan or time-amplitude ultrasonography and B-scan or scanned intensity modulated ultrasonography. Differential diagnosis of pathologic conditions within the eye and orbit may be made using quantitative, kinetic and topographic e
Any sound with a frequency on the order of millions of cycles per second (megacycles per second) is called ultrasound. A piezoelectric transducer can produce ultrasonic vibrations of several megacycles per second. In a suitable liquid medium' such as saline or methylcellulose solution, the pulses of this transducer are transmitted, causing reflections at the boundaries between media with different acoustic properties. These reflections or echoes are picked up by the same transducer, converted to electrical signals and displayed on a cathode ray oscilloscope. The two methods of ultrasound in use are A-scan or time-amplitude ultrasonography and B-scan or scanned intensity modulated ultrasonography. Differential diagnosis of pathologic conditions within the eye and orbit may be made using quantitative, kinetic and topographic e
