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Anatomical OCT
Also see: Clinical Application - Obstructive Sleep Apnoea
What is Anatomical OCT?
Anatomical OCT (aOCT) is a long-range scanning implementation of Optical Coherence
Tomography (OCT) that maps internal anatomy as opposed to the conventional
sub-surface morphology. It is used to provide endoscopic imaging of the anatomy of
large, hollow organs, at a greater scale than is typically possible with OCT.
It has been successfully applied to scanning of the upper airway, allowing the
generation of 3D models showing the anatomical shape of the airway during sleep studies.
A limiting factor on the axial scan range of OCT systems is the optical delay line
used in the low-coherence interferometer. By using a rapid-scanning frequency-domain
optical delay line, we have achieved a scanning range of more than several centimeters.
Clinical aOCT system
We have developed a clinical aOCT system in co-operation with researchers at the
West Australian Sleep Disorders Research Institute at Sir Charles Gairdner Hospital
(http://www.wasdri.org.au/).
The system consists of an endoscopic probe which is inserted into the patient through a
catheter. The probe head utilizes a Gradient Index (GRIN) lens to focus the optical beam,
and a small prism to redirect the beam perpendicular to the probe. A frequency-domain
optical delay line is used to acquire each A-scan, and the probe head is rotated through
360 degrees within the catheter for a complete scan of the anatomy.
 
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