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Ultrasonic scanning systems that include an ultrasonic scanner (usually operated in A or B mode), transducers (frequencies of 7.5 to 10.0 MHz are typically used because high-resolution imaging is needed), dedicated software, a recording subsystem, and a printer. Most ophthalmic ultrasonic scanning systems are used to measure the axial length of the eye, to assess eyes in which opacity prevents direct ophthalmologic examinations, and to study both intraocular and orbital tumors.
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