Neurosurgical hand-held optical coherence tomography (OCT) forward-viewing probe
2012
A prototype neurosurgical hand-held optical coherence tomography (OCT) imaging probe has been developed to provide
micron resolution cross-sectional images of subsurface tissue during open surgery. This new ergonomic hand-held probe
has been designed based on our group's previous work on electrostatically driven optical fibers. It has been packaged
into a catheter probe in the familiar form factor of the clinically accepted Bayonet shaped neurosurgical non-imaging
Doppler ultrasound probes. The optical design was optimized using ZEMAX simulation. Optical properties of the probe
were tested to yield an ~20 um spot size, 5 mm working distance and a 3.5 mm field of view. The scan frequency can be
increased or decreased by changing the applied voltage. Typically a scan frequency of less than 60Hz is chosen to keep
the applied voltage to less than 2000V. The axial resolution of the probe was ~15 um (in air) as determined by the OCT
system. A custom-triggering methodology has been developed to provide continuous stable imaging, which is crucial for
clinical utility. Feasibility of this probe, in combination with a 1310 nm swept source OCT system was tested and images
are presented to highlight the usefulness of such a forward viewing handheld OCT imaging probe. Knowledge gained
from this research will lay the foundation for developing new OCT technologies for endovascular management of
cerebral aneurysms and transsphenoidal neuroendoscopic treatment of pituitary tumors.
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