Endoscopy 2022; 54(S 01): S168-S169
DOI: 10.1055/s-0042-1745019
Abstracts | ESGE Days 2022
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ACCURACY IMPROVEMENT OF RECONSTRUCTED 3-DIMENSIONAL COLONOSCOPE DISPLAY APPLYING FIBER BRAGG GRATING SENSOR

J. Park
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
B. Keum
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
J. Shim
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
G. Park
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
J. Yoon
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
E.J. Bang
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
K.W. Lee
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
S.H. Kim
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
H.J. Jeon
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
J.M. Lee
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
H.S. Choi
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
E.S. Kim
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
Y.T. Jeen
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
H.S. Lee
1   Korea University Anam Hospital, Seoul, Korea, Republic of
,
H.J. Chun
1   Korea University Anam Hospital, Seoul, Korea, Republic of
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Aims Fiber brag grating (FBG) sensor is a detector that irradiates a laser to the core fiber of an optic fiber and measures the difference in wavelength due to changes in the length and strain of the fiber. However, there was a problem in realizing an accurate colonoscope shape in 3-dimensional (3D) display due to a signal generated from a site not inserted into the colonoscope. Therefore, this study aims to increase the precision of the length and shape of the 3D colonoscope by applying the technology of selectively turning the sensor on/off based on the anus using the FBG sensor.

Methods 3D colonoscope display was manufactured and compared in three different ways in vitro. First, an instrument was manufactured to measure the length of the inserted endoscope in the colon by converting the amount of rotation into the insertion length using a roller. In the second, the shape of the colonoscope was displayed by measuring the change in sine wave according to the colonoscope, which went through magnet coil in front of the anus. Thirdly, the shape of the colonoscope was displayed using a phantom colonoscope model with the fixed point in the anus as a reference.

Results

Table 1

1. measure the length automatically according to the amount of rotation of the roller

the operation of the sensor of external endoscope showed instability in the overall endoscope-shaped display, causing inconvenience to manuevebility.

2. method using the magnetic coil was able to measure the inserted length by changing the magnetic field

it showed limitation in realizing the exact shape of the endoscope due to the low sensitivity.

3. phantom model

the anus was set as a reference to detect the minimum wavelength change, and the length and colonoscope were implemented with minimal errors in 3-D reconstruction.

Conclusions Colonoscopy using a sensor was most effective and showed feasibility when the anus was expressed as a fixed point. Further clinical study using FBG sensor is expected to be needed in the near future.



Publication History

Article published online:
14 April 2022

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