Adaptive camera calibration for a focus adjustable liquid lens in fiber optic endoscopy

2021 ◽  
Author(s):  
Lennart Hinz ◽  
Markus Kästner ◽  
Eduard Reithmeier
Keyword(s):  
Camera Calibration ◽  
Fiber Optic ◽  
Liquid Lens ◽  
Optic Endoscopy

scholarly journals Intraoperative Fiber-Optic Endoscopy for Ventricular Catheter Insertion

2001 ◽  
Vol 28 (1) ◽  
pp. 56-60 ◽  
Author(s):  
Philip V. Theodosopoulos ◽  
Aviva Abosch ◽  
Michael W. McDermott
Keyword(s):  
Fiber Optic ◽  
Catheter Placement ◽  
Ventricular Catheter ◽  
Neurosurgical Procedure ◽  
Significant Difference ◽  
Catheter Tip ◽  
Endoscopic Guidance ◽  
Ventricular Catheters ◽  
Tip Position ◽  
Optic Endoscopy

ABSTRACT:Objective:Ventricular catheter placement is a common neurosurgical procedure often resulting in inaccurate intraventricular positioning. We conducted a comparison of the accuracy of endoscopic and conventional ventricular catheter placement in adults.Methods:A retrospective analysis of data was performed on 37 consecutive patients undergoing ventriculo-peritoneal shunt (VPS) insertion with endoscopy and 40 randomly selected, unmatched patients undergoing VPS insertion without endoscopy, for the treatment of hydrocephalus of varied etiology. A grading system for catheter tip position was developed consisting of five intraventricular zones, V1-V5, and three intraparenchymal zones, A, B, C. Zones V1 for the frontal approaches and V1 or V2 for the occipital approaches were the optimal catheter tip locations. Postoperative scans of each patient were used to grade the accuracy of ventricular catheter placement.Results:Seventy-six percent of all endoscopic ventricular catheters were in zone V1 and 100% were within zones V1-V3. No endoscopically inserted catheters were observed in zones V4, V5 or intraparenchymally. Thirty-eight percent of the conventionally placed catheters were in zone V1, 53% in zones V1-3 and 15% intraparenchymally. There was a statistically significant difference in the percentage of catheters in optimal location versus in any other location, favoring endoscopic guidance (p<0.001).Conclusion:We conclude that endoscopic ventricular catheter placement provides improved positioning accuracy than conventional techniques.

A liquid lens switching-based motionless variable fiber-optic delay line

2018 ◽  
Vol 42 ◽  
pp. 29-33
Author(s):  
Tariq Shamim Khwaja ◽  
Syed Azer Reza ◽  
Mumtaz Sheikh
Keyword(s):  
Delay Line ◽  
Fiber Optic ◽  
Liquid Lens

Fiber Optic Endoscopy: Gastroscopy

Rural Surgery ◽  
2011 ◽  
pp. 35-39
Author(s):  
Matthias W. Wichmann ◽  
Fritz W. Spelsberg
Keyword(s):  
Fiber Optic ◽  
Optic Endoscopy

Fiber Optic Endoscopy

1963 ◽  
Vol 90 (3) ◽  
pp. 324-334 ◽  
Author(s):  
Frederick J. Wallace
Keyword(s):  
Fiber Optic ◽  
Optic Endoscopy

Fiber Optic Endoscopy: Bronchoscopy

Rural Surgery ◽  
2011 ◽  
pp. 31-34
Author(s):  
Matthias W. Wichmann ◽  
Fritz W. Spelsberg
Keyword(s):  
Fiber Optic ◽  
Optic Endoscopy

Quantitative phase imaging with epi-mode illumination for fiber-optic endoscopy

2020 ◽  
Author(s):  
Zhe Guang ◽  
Patrick B. Ledwig ◽  
Paloma Casteleiro Costa ◽  
Francisco E. Robles
Keyword(s):  
Fiber Optic ◽  
Phase Imaging ◽  
Quantitative Phase Imaging ◽  
Quantitative Phase ◽  
Optic Endoscopy

Mechanisms of Airway Obstruction in Robin Sequence: Implications for Treatment

1992 ◽  
Vol 29 (3) ◽  
pp. 224-231 ◽  
Author(s):  
Aaron E. Sher
Keyword(s):  
Airway Obstruction ◽  
Fiber Optic ◽  
Upper Airway ◽  
Upper Airway Obstruction ◽  
Robin Sequence ◽  
Flexible Fiber ◽  
Optic Endoscopy

Though the problems associated with Robin sequence may be numerous, especially if the primary cause of the sequence is a multiple anomaly syndrome, the most acute problems in affected newborns Is upper airway obstruction. Until recently It has been tacitly assumed that glossoptosis is always the cause of the airway obstruction. More recent evidence has shown that the sources of airway obstruction are multiple and the cause of apnea heterogeneous. The purpose of this paper is to report the mechanisms of upper airway obstruction In 53 Infants with Robin sequence. The use of flexible fiber optic endoscopy to specify treatment is discussed in detail.

scholarly journals An all-fiber-optic endoscopy platform for simultaneous OCT and fluorescence imaging

2012 ◽  
Vol 3 (11) ◽  
pp. 2851 ◽  
Author(s):  
Jessica Mavadia ◽  
Jiefeng Xi ◽  
Yongping Chen ◽  
Xingde Li
Keyword(s):  
Fluorescence Imaging ◽  
Fiber Optic ◽  
Optic Endoscopy
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