Optical Tomography Versus Ultrasound
Ultrasound imaging is widely used clinically for quantitative measurements of intraocular distances as well as imaging the anterior eye and globe [8-9]. Since ultrasound imaging depends on the reflection of sound waves from intraocular structures, it requires direct contact of the ultrasound measuring device to the cornea or immersion of the eye in a liquid which facilitates the transmission of sound waves into the globe.
The resolution of ultrasound measurement depends directly on the frequency or wavelength of the sound waves which are used. For typical ultrasound systems, sound wave frequencies are in the ten megahertz (10 MHz) regime which yield spatial resolutions of approximately 150 microns. Ultrasound imaging also has the advantage that sound waves are readily
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