scholarly journals Observations And Experiments For The Definition Of A New Robotic Device Dedicated To CT, CBCT And MRI-Guided Percutaneous Procedures

2018 ◽  
Author(s):  
Antoine Pfeil ◽  
Laurent Barbe ◽  
Benoit Wach ◽  
Roberto Luigi Cazzato ◽  
Afshin Gangi ◽  
...  
Keyword(s):  
Robotic Device ◽  
Percutaneous Procedures ◽  
Mri Guided ◽  
Definition Of

scholarly journals Interventional MR elastography for MRI‐guided percutaneous procedures

2016 ◽  
Vol 75 (3) ◽  
pp. 1110-1118 ◽  
Author(s):  
Nadège Corbin ◽  
Jonathan Vappou ◽  
Elodie Breton ◽  
Quentin Boehler ◽  
Laurent Barbé ◽  
...  
Keyword(s):  
Mr Elastography ◽  
Percutaneous Procedures ◽  
Interventional Mr ◽  
Mri Guided

Assessment of the Accuracy of Optical Shape Sensing for Needle Tracking Interventions

2017 ◽  
Vol 11 (3) ◽  
Author(s):  
Koushik Kanti Mandal ◽  
Francois Parent ◽  
Raman Kashyap ◽  
Sylvain Martel ◽  
Samuel Kadoury
Keyword(s):  
Optical Fibers ◽  
Liver Tumors ◽  
Tracking System ◽  
Ground Truth ◽  
Guidance System ◽  
Tracking Accuracy ◽  
Percutaneous Procedures ◽  
Fbg Sensors ◽  
Mri Guided ◽  
Similar Accuracy

Accurate needle guidance is essential for a number of magnetic resonance imaging (MRI)-guided percutaneous procedures, such as radiofrequency ablation (RFA) of metastatic liver tumors. A promising technology to obtain real-time tracking of the shape and tip of a needle is by using high-frequency (up to 20 kHz) fiber Bragg grating (FBG) sensors embedded in optical fibers, which are insensitive to external magnetic fields. We fabricated an MRI-compatible needle designed for percutaneous procedures with a series of FBG sensors which would be tracked in an image-guidance system, allowing to display the needle shape within a navigation image. A series of phantom experiments demonstrated needle tip tracking errors of 1.05 ± 0.08 mm for a needle deflection up to 16.82 mm on a ground-truth model and showed nearly similar accuracy to electromagnetic (EM) tracking (i.e., 0.89 ± 0.09 mm). We demonstrated feasibility of the FBG-based tracking system for MRI-guided interventions with differences under 1 mm between tracking systems. This study establishes the needle tracking accuracy of FBG needle tracking for image-guided procedures.

scholarly journals MRI-guided definition of cerebrospinal fluid distribution around cranial and sacral nerves: implications for brain tumors and craniospinal irradiation

2019 ◽  
Vol 58 (12) ◽  
pp. 1740-1744
Author(s):  
Amber M. Wood ◽  
Maarten H. Lequin ◽  
Marielle M. Philippens ◽  
Enrica Seravalli ◽  
Sabine L. Plasschaert ◽  
...  
Keyword(s):  
Cerebrospinal Fluid ◽  
Brain Tumors ◽  
Craniospinal Irradiation ◽  
Fluid Distribution ◽  
Sacral Nerves ◽  
Mri Guided ◽  
Definition Of

Using NASREM for real-time sensory interactive robot control

Robotica ◽  
1994 ◽  
Vol 12 (2) ◽  
pp. 127-135 ◽  
Author(s):  
R. Lumia
Keyword(s):  
Real Time ◽  
System Architecture ◽  
Robot Control ◽  
Control Experiment ◽  
Reference Model ◽  
Space Station ◽  
Robotic Device ◽  
Control Computer ◽  
Definition Of ◽  
Control System Architecture

SUMMARYThe Flight Telerobotic Servicer (FTS) is a robotic device which will be used to build and maintain Space Station Freedom. The FTS is expected to evolve from its initial capability of teleoperation toward greater autonomy by taking advantage of advances in technology as they become available. In order to support this evolution, NASA has chosen the NASA/NIST Standard Reference model for Telerobot Control System Architecture (NASREM) as the FTS functional architecture. As a result of the definition of generic interfaces in NASREM, the system can be modified without major impact. Consequently, different approaches to solve a problem can be tested easily. This paper describes the implementation of NASREM in the NIST laboratory. The approach is to build a flexible testbed to enhance research in robot control, computer vision, and related areas. To illustrate the real-time aspects of the implementation, a sensory interactive motion control experiment will be described.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

2.2. Working Group 2: Conceptual Definitions of Reference Coordinate Systems for Earth Dynamics

1975 ◽  
Vol 26 ◽  
pp. 21-26
Keyword(s):  
Coordinate System ◽  
Working Group ◽  
General Character ◽  
Coordinate Systems ◽  
Reference Coordinate System ◽  
Group 2 ◽  
Definition Of ◽  
Earth Dynamics

An ideal definition of a reference coordinate system should meet the following general requirements:1. It should be as conceptually simple as possible, so its philosophy is well understood by the users.2. It should imply as few physical assumptions as possible. Wherever they are necessary, such assumptions should be of a very general character and, in particular, they should not be dependent upon astronomical and geophysical detailed theories.3. It should suggest a materialization that is dynamically stable and is accessible to observations with the required accuracy.

Symbiotic Stars at Optical, Infrared and Radio Wavelengths

1979 ◽  
Vol 46 ◽  
pp. 125-149 ◽  
Author(s):  
David A. Allen
Keyword(s):  
Temperature Regime ◽  
Type Star ◽  
Stellar Systems ◽  
Symbiotic Stars ◽  
Lower Excitation ◽  
Definition Of ◽  
Original Type

No paper of this nature should begin without a definition of symbiotic stars. It was Paul Merrill who, borrowing on his botanical background, coined the termsymbioticto describe apparently single stellar systems which combine the TiO absorption of M giants (temperature regime ≲ 3500 K) with He II emission (temperature regime ≳ 100,000 K). He and Milton Humason had in 1932 first drawn attention to three such stars: AX Per, CI Cyg and RW Hya. At the conclusion of the Mount Wilson Ha emission survey nearly a dozen had been identified, and Z And had become their type star. The numbers slowly grew, as much because the definition widened to include lower-excitation specimens as because new examples of the original type were found. In 1970 Wackerling listed 30; this was the last compendium of symbiotic stars published.

Sign in / Sign up

Export Citation Format

Share Document