Value of a laser guidance system for CT interventions: a phantom study

1999 ◽  
Vol 9 (1) ◽  
pp. 137-140 ◽  
Author(s):  
V. Jacobi ◽  
A. Thalhammer ◽  
J. Kirchner
Keyword(s):  
Phantom Study ◽  
Guidance System ◽  
Laser Guidance

Development of laser guidance system for UAV

2021 ◽  
Vol 2021.59 (0) ◽  
pp. 10a1
Author(s):  
Naoki KAMIO ◽  
Masafumi MIWA ◽  
Yusuke TAKEUCHI
Keyword(s):  
Guidance System ◽  
Laser Guidance

scholarly journals A Concept of a Compact and Inexpensive Device for Controlling Weeds with Laser Beams

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1616
Author(s):  
Ildar Rakhmatulin ◽  
Christian Andreasen
Keyword(s):  
Neural Network ◽  
Decision Model ◽  
Control Device ◽  
Guidance System ◽  
Laser Beams ◽  
Laser Guidance ◽  
Couch Grass ◽  
Elytrigia Repens ◽  
Weed Plants ◽  
Plant Length

A prototype of a relatively cheap laser-based weeding device was developed and tested on couch grass (Elytrigia repens (L.) Desv. ex Nevski) mixed with tomatoes. Three types of laser were used (0.3 W, 1 W, and 5 W). A neural network was trained to identify the weed plants, and a laser guidance system estimated the coordinates of the weed. An algorithm was developed to estimate the energy necessary to harm the weed plants. We also developed a decision model for the weed control device. The energy required to damage a plant depended on the diameter of the plant which was related to plant length. The 1 W laser was not sufficient to eliminate all weed plants and required too long exposure time. The 5 W laser was more efficient but also harmed the crop if the laser beam became split into two during the weeding process. There were several challenges with the device, which needs to be improved upon. In particular, the time of exposure needs to be reduced significantly. Still, the research showed that it is possible to develop a concept for laser weeding using relatively cheap equipment, which can work in complicated situations where weeds and crop are mixed.

Development of new laser guidance system which improves accuracy of image-guided biopsy

1997 ◽  
Vol 4 (12) ◽  
pp. 844-845
Author(s):  
F. Scott Pereles ◽  
Evan C. Unger ◽  
Michael R. Baker ◽  
Elizabeth A. Krupinski
Keyword(s):  
Guidance System ◽  
Laser Guidance ◽  
Image Guided ◽  
Guided Biopsy

scholarly journals CIGuide: in situ augmented reality laser guidance

2019 ◽  
Vol 15 (1) ◽  
pp. 49-57
Author(s):  
Zoltán Bárdosi ◽  
Christian Plattner ◽  
Yusuf Özbek ◽  
Thomas Hofmann ◽  
Srdjan Milosavljevic ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Skull Base ◽  
Visual Cues ◽  
Needle Insertion ◽  
Guidance System ◽  
Laser Guidance ◽  
End Effector ◽  
Magnetic Tracking ◽  
Lateral Skull Base

Abstract Purpose  A robotic intraoperative laser guidance system with hybrid optic-magnetic tracking for skull base surgery is presented. It provides in situ augmented reality guidance for microscopic interventions at the lateral skull base with minimal mental and workload overhead on surgeons working without a monitor and dedicated pointing tools. Methods  Three components were developed: a registration tool (Rhinospider), a hybrid magneto-optic-tracked robotic feedback control scheme and a modified robotic end-effector. Rhinospider optimizes registration of patient and preoperative CT data by excluding user errors in fiducial localization with magnetic tracking. The hybrid controller uses an integrated microscope HD camera for robotic control with a guidance beam shining on a dual plate setup avoiding magnetic field distortions. A robotic needle insertion platform (iSYS Medizintechnik GmbH, Austria) was modified to position a laser beam with high precision in a surgical scene compatible to microscopic surgery. Results  System accuracy was evaluated quantitatively at various target positions on a phantom. The accuracy found is 1.2 mm ± 0.5 mm. Errors are primarily due to magnetic tracking. This application accuracy seems suitable for most surgical procedures in the lateral skull base. The system was evaluated quantitatively during a mastoidectomy of an anatomic head specimen and was judged useful by the surgeon. Conclusion  A hybrid robotic laser guidance system with direct visual feedback is proposed for navigated drilling and intraoperative structure localization. The system provides visual cues directly on/in the patient anatomy, reducing the standard limitations of AR visualizations like depth perception. The custom- built end-effector for the iSYS robot is transparent to using surgical microscopes and compatible with magnetic tracking. The cadaver experiment showed that guidance was accurate and that the end-effector is unobtrusive. This laser guidance has potential to aid the surgeon in finding the optimal mastoidectomy trajectory in more difficult interventions.

Potentials of a new laser guidance system for percutaneous musculoskeletal procedures

1998 ◽  
Vol 27 (1) ◽  
pp. 18-21 ◽  
Author(s):  
F. S. Pereles ◽  
H. T. Ozgur ◽  
P. J. Lund ◽  
E. C. Unger
Keyword(s):  
Guidance System ◽  
Laser Guidance

scholarly journals Survey on Laser Guided Missile Systems and Implementation by Developing a Laser Guidance System

2021 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Gopisetty Srinivas ◽  
Harish Kumar Gowda ◽  
Harshitha C. Gowda ◽  
Jyothi S. T. ◽  
Ravi Shankar D. ◽  
...  
Keyword(s):  
Guidance System ◽  
Laser Guidance

Design and Prototype Development of Quadrant Estimation Unit for Laser Beam Rider Guidance System

2020 ◽  
Vol 9 (03) ◽  
pp. 24970-24977
Author(s):  
Dr. Gunti Avinash ◽  
Saiseshu Reddy ◽  
P. Vijaya Poojitha
Keyword(s):  
Laser Beam ◽  
Beam Quality ◽  
Low Cost ◽  
Essential Element ◽  
Guidance System ◽  
Target Space ◽  
Laser Guidance ◽  
Atmospheric Transmission ◽  
Silicon Photodiode ◽  
Prototype Development

With the development of science and technology, precision-strike weapons are been considered to be important for winning victory and defending the country during war (or) attack. Laser guidance is one of the major methods to execute precision-strike in modern warfare. At present, the problems faced at the primary stage of Laser guidance has been solved with endeavors of countries. Several technical aspects of laser-beam riding guided system have been mature, such as atmosphere penetration of laser beam, clutter inhibition on ground, laser irradiator, encoding and decoding of laser beam. Further, laser beam quality, equal output power and atmospheric transmission properties are qualified for warfare situation. Riding guidance instrument is a crucial element of Laser-beam riding guided system and also in Radar-beam riding guiding system, and is also a essential element of airborne, vehicle-mounted and individual weapon. The optical system mainly consists of sighting module and laser-beam guided module. Photo detector (Quadrant detector) is the most important sensing device, and also the key to acquire the coordinate information of target space. Currently, in consideration of the 1064 nm of wavelength applied in all the semi-active laser guided weapons systems, lithium drifting silicon photodiode which is sensitive to 1064 nm of wavelength is used in photoelectric detector. Compared to Solid and gas laser, diode laser has many merits such as small volume, simple construction, light weight, long life, low cost and easy modulation.  The present work includes the study of Various ATGM, their guidance mechanism, particularly laser beam rider guidance. Study has been carried to understand the composition and operating principle of Laser-beam riding guided system. The present work also deals with prototype development of quadrant estimation unit required for Laser beam rider guidance.

Copperhead semi-active laser guidance system development

1978 ◽  
Author(s):  
R. NULK ◽  
H. PASTRICK ◽  
P. MORRISON
Keyword(s):  
System Development ◽  
Guidance System ◽  
Laser Guidance ◽  
Active Laser
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