Tech Briefs Magazine - November 2021 - PIT-17

light-source itself has an inferior
design. Reliance on calibrations to
" fix " the light source design can lead
to the produced image looking overprocessed.
Addi tion ally, if the ISP
must have memory allocated to calibrations,
there is a risk of increasing
the latency of the vision system, limiting
robotic performance.
Finally, after the light engine,
illumination, imaging optics, and
camera firm ware are designed,
proper testing is required. Often
the illumination system components
require 100% inspection and
calibration on the sources in capital
equipment and laparoscopes as
well. These tests require operating
the device under test in a variety of conditions
using specialized targets to measure
color accuracy, uniformity, and power output.
Designing a system to automate these
tests reduces the risk for part-to-part and
tester-to-tester variability, ensuring product
standards are maintained in the field.
These test stations require detailed
mechanical, system, and software design to
ensure they have successful deployment
on manufacturing floors.
Test target being used to measure the image quality of a surgical
endoscope.
There are other considerations
for
endoscopy, or flexible scope applications.
These devices often have more limitations
on space available for illumination,
may only have 2D imaging, be single-use,
or other caveats not pertaining to the
parameters presented in the article. For
small-diameter and single-use devices,
plastic fibers, LEDs in the tip and other,
more-compact solutions, can enable a
successful product, in which different
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design considerations and risk-mitigations
are considered.
To summarize, the development
of the illumination components
for robotics surgery systems is a
complex process. One should start
from a complete understanding of
the clinical application and build
off that understanding. If one is
designing a robotic system for
white light and NIR applications,
we recommend a design based on
utilizing a high-NA fiber with a
light engine installed in the capital
equipment. To achieve the broadest
illumination angle, the use of
high-NA fibers to deliver light to
the tip of the device is recommended.
This is the most concise design
approach that avoids an overly complex
design. Other solutions can lead to gaps
in functionality, resulting in a workaround
design.
This article was written by Jonathan Brand,
Optical Systems Engineer, and Neil Anderson,
PhD, VP Sales and Marketing, Gray Optics
(Portland, ME). For more information, contact
Neil Anderson at neil@grayoptics.com, or visit
http://info.hotims.com/79419-223.
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Tech Briefs Magazine - November 2021

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