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Sunday
Sep262010

OCT primer

OCT, or ocular coherence tomography, has gone through a few iterations since its inception.  For eye imaging, the mainstay has been the time domain method.  With a high res scan, the time domain method can produce about 1 and 1/2 B scans per second.  This equals around 400 A scans per second.

With spectral domain HD imaging, you go from a peak of 1.5 scans/sec with time domain to almost 500 scans/sec with spectral domain.  This equals around 27,000 A scans per second.  Obviously with the new method, extremely detailed retinal maps can be obtained in a much faster timespan.

SD OCT imaging offers many advantages in terms of patient care.  This imaging technique does not utilize "ionizing radiation" as other medical imaging techniques such as MRI or CT scans.  While not a perfect analogy, this technique is more akin to ultrasound as far as its safety protocol.  No radiation or X-Ray aprons necessary...whew!

Improvements from a technical standpoint (firmware update for the Cirrus HD OCT), have allowed interesting developments in glaucoma management care, and are superior to what has been previously available from other manufacturers. 

To be clear, this is much more than a "fundus photo" that many local eye doctors offer.  This is a high definition imaging device that offers countless advantages over a simple digital camera image. 

more to come...

 

 

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