A5023460291- Optical Coherence Tomography Applications
- Retinal and Macular Surgery
- Retinal Imaging and Analysis
- Corneal surgery and disorders
- Soft Robotics and Applications
- Control Systems and Identification
- Sensor Technology and Measurement Systems
- Historical Studies of Medieval Iberia
- Medieval Architecture and Archaeology
- Comparative constitutional jurisprudence studies
- Fault Detection and Control Systems
- Image and Object Detection Techniques
- Photoacoustic and Ultrasonic Imaging
- Laser Design and Applications
- Gastrointestinal disorders and treatments
- Robotics and Sensor-Based Localization
- Archaeological and Historical Studies
- Augmented Reality Applications
- Advanced Vision and Imaging
- Medical Image Segmentation Techniques
- Gallbladder and Bile Duct Disorders
- Glaucoma and retinal disorders
- Religious and Theological Studies
- Pancreatitis Pathology and Treatment
- Laser Material Processing Techniques
University of Cauca
2020
Leibniz University Hannover
2012-2015
In recent years, bone-attached robots and microstereotactic frames have attracted increasing interest due to the promising targeting accuracy they provide. Such devices attach a patient's skull via bone anchors, which are used as landmarks during intervention planning well. However, simulation results reveal, performance of such mechanisms is limited by errors occurring localization their anchors in preoperatively acquired computed tomography images. Therefore, it desirable identify most...
Laser surgery has gained clinical importance due to numerous advantages including contact-free processing, arbitrary cutting geometries, and high precision.However, online process control remains a challenge for widespread use.Therefore, we established combined setup of pulsed Er:YAG laser ( = 2940 nm) an optical coherence tomography (OCT) 930 in situ monitoring hard tissue ablation.The facilitates interactive the ablation depth remaining strength through resolution OCT.The 3D OCT data-set,...
We present a novel one-step calibration methodology for geometrical distortion correction optical coherence tomography (OCT). A standard especially designed OCT is introduced, which consists of an array inverse pyramidal structures. The use multiple landmarks situated on four different height levels the pyramids allow performing 3D calibration. procedure itself based parametric model beam propagation. It validated by experimental results and enables reduction systematic errors more than one...
Designing a Kalman filter requires knowledge about the stochastic part of system. Thus, disturbances affecting states and measurements should be known. However, in practical application these are usually unknown. In this contribution modification autocovariance least-square method is presented. This converts measurement process noise covariance estimation problem into least squares functional, which can solved with Landweber iteration to regularize illposed problem. Then, tuned gain...
This contribution compares two approaches for the geometric calibration of an optical coherence tomography (OCT) which forms part a medical navigation system. For this purpose, one step and multi is performed with self-produced 3D reference structure high-accurate 6 degrees freedom (DoF) parallel robot, respectively. These landmark-based calibrations are based on identification parameterized grey-box OCT model. We show in experimental results that both methods reduce systematic errors by...
Optical techniques are utilized in robot aided surgery as navigation tools to guide surgical instruments. The advantages a reduction of severe damage during and post-surgical trauma. A common approach is place spherical markers inside the operating field, which can be detected by 3D imaging device, order determine position patient with respect instrument. coherence tomography (OCT) not only capable detecting these kind artificial landmarks, but also natural features within field bone. For...
Introducción. La colecistectomía laparoscópica es el tratamiento estándar para la colecistitis aguda. En pacientes con coledocolitiasis, colangiopancreatografía retrógrada endoscópica de elección. Se ha reportado que, después este procedimiento endoscópico, más difícil y son mayores las tasas conversión, hemorragia tiempo operatorio. El objetivo estudio fue determinar si en nuestro medio colecistectomías laparoscópicas posteriores a endoscópico presentan complicaciones posquirúrgicas mayor...
This article presents a one step geometric calibration for an optical coherence tomography (OCT) which forms part of medical navigation system. The 3D landmark-based with self-produced reference structure is based on the identification parameterized grey-box OCT model. We show in experimental results by comparing common measurement errors field surgery before and after calibration, that proposed methodology reduces systematic more than order magnitude. Due to its simplicity, can be carried...
In recent years, optical coherence tomography (OCT) has gained increasing attention not only as an imaging device, but also a navigation system for surgical interventions. This approach demands to register intraoperative OCT pre-operative computed (CT) data. this study, we evaluate algorithms multi-modal image registration of and CT data human temporal bone specimen. We focus on similarity measures that are common in field, e.g., normalized mutual information, cross correlation, iterative...
The choice of a navigation system highly depends on the medical intervention and its accuracy demands. most commonly used systems for image guided surgery (IGS) are based optical magnetic tracking systems. This paper compares two in terms accuracy: state art triangulation-based (OT) coherence tomography (OCT). We use an experimental setup with combined OCT cutting laser, external OT. simulate robotic assisted surgical intervention, including planning, navigation, processing, compare...