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Ophthalmic Ultrasound for diagnostic imaging and biometry has been in use since the 1960s. For nearly 50 years,
advances in technology of transducers, miniaturization, computers, and software have revolutionized portabillity and diagnostic
imaging. We believe the technology in the LinscanUSB exemplifies the best of today's latest technology and thinking.
When to conduct an ophthalmic ultrasound exam Under normal circumstances, the ophthalmologist can readily observe the anatomy and specifically
the retina using ophthalmoscopy. When ever this view into the eye is occluded by a dense cataract or blood in the eye,
an ultrasound (US) examination is critical in best patient care. Also, when there is a suspect foreign body, mass, or
eye protrusion; the ultrasound image will provide diagnostic insight to the patient's condition. In any instances, the US
exam can give much information about retina detachments. In
animals, using appropriate sedation is required to obtain best clinical information and conduct a thorough US examination.
It is recommended that the examination be recorded so that the complete orbit is assessed using axial, horizontal, and longitudinal
"sweeps". Additionally, the US is very helpful in observing anatomical changes brought on by intravitreal
drug delivery as well as real time imaging of retrobulbar injections for a variety of species. What to use in an ophthalmic ultrasound exam If the regional from the cornea to posterior lenses is of interest, then a
high resolution, high frequency ultrasound is appropriate. The frequency for this application should be greater than
20MHz and optimized for correct depth of penetration. The echographer should also consider using a immersion shell (Hansen
Laboratories) for best image quality. Also, using a water filled probe cover in a clinical setting yields excellent
image quality in various eye positions and in different size eyes (mouse to elephant). For more information how the LinscanUSB portable ultrasound system can provide anterior images, click the 24 MHz
image.
For the posterior region of the eye, depth and observing variations in the, vitreous, retina, choroid, optic nerve,
and surrounding ocular tissues. The most appropriate image quality can easily be seen using 12 to 15 MHz frequency transducers.
This type of imaging can be done on awake patients through the eyelid, or with sedation for more fractious patients.
The posterior image also gives a complete image of the eye, from cornea to optic nerve. The ability to capture the previous
seconds of an ophthalmic US exam is very helpful since the echographer can replay and save specific frames as jpeg images
for patient data management. For more information how the LinscanUSB portable ultrasound system can provide posterior images, click the 12 MHz
image.
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