Simultaneous Physiological Motion Cancellation and Depth Adaptation in Flexible Endoscopy

2009 ◽  
Vol 56 (9) ◽  
pp. 2322-2326 ◽  
Author(s):  
L. Ott ◽  
F. Nageotte ◽  
P. Zanne ◽  
M. de Mathelin
Keyword(s):  
Flexible Endoscopy ◽  
Physiological Motion

scholarly journals A role-based component architecture for computer assisted interventions: illustration for electromagnetic tracking and robotized motion rejection in flexible endoscopy

2009 ◽  
Author(s):  
Jean-baptiste Fasquel ◽  
Guillaume Chabre ◽  
Philippe Zanne ◽  
Stéphane Nicolau ◽  
Vincent Agnus ◽  
...  
Keyword(s):  
Software Architecture ◽  
Flexible Endoscopy ◽  
Computer Assisted ◽  
Electromagnetic Tracking ◽  
Independent Components ◽  
Component Architecture ◽  
Physiological Motion ◽  
Software Coupling ◽  
Role Based ◽  
Glue Code

This paper presents an original role-based software architecture facilitating the flexible composition, configuration and collaboration of separated components in the field of computer assisted interventions. Roles, which can be seen as methods dynamically attached to objects, are embedded in components, to limit build level dependencies and improve flexibility. An appropriate component definition and composition language is proposed to declare softwares, without any specific initialization or glue code, this remaining a challenging issue in component oriented programming. The potential of this architecture is illustrated for a software coupling electromagnetic tracking with a robotized system dedicated to the physiological motion rejection in flexible endoscopy. This software consists in several independent components with are combined at runtime thanks to a concise XML-based declaration.

scholarly journals Robotic Assistance to Flexible Endoscopy by Physiological-Motion Tracking

2011 ◽  
Vol 27 (2) ◽  
pp. 346-359 ◽  
Author(s):  
L Ott ◽  
F Nageotte ◽  
P Zanne ◽  
M de Mathelin
Keyword(s):  
Motion Tracking ◽  
Flexible Endoscopy ◽  
Robotic Assistance ◽  
Physiological Motion

Gaze-contingent Robotic Flexible Endoscopy

2019 ◽  
Author(s):  
K K Kogkas ◽  
◽  
B Glover ◽  
N Patel ◽  
A Darzi ◽  
...  
Keyword(s):  
Flexible Endoscopy

scholarly journals Imaging coronary plaques using 3D motion-compensated [18F]NaF PET/MR

2021 ◽  
Author(s):  
Johannes Mayer ◽  
Thomas-Heinrich Wurster ◽  
Tobias Schaeffter ◽  
Ulf Landmesser ◽  
Andreas Morguet ◽  
...  
Keyword(s):  
Attenuation Correction ◽  
Free Breathing ◽  
Cardiac Motion ◽  
Water Fraction ◽  
3 Dimensional ◽  
Background Ratio ◽  
Motion Models ◽  
Physiological Motion ◽  
Atherosclerosis Imaging ◽  
Novel Applications

Abstract Background Cardiac PET has recently found novel applications in coronary atherosclerosis imaging using [18F]NaF as a radiotracer, highlighting vulnerable plaques. However, the resulting uptakes are relatively small, and cardiac motion and respiration-induced movement of the heart can impair the reconstructed images due to motion blurring and attenuation correction mismatches. This study aimed to apply an MR-based motion compensation framework to [18F]NaF data yielding high-resolution motion-compensated PET and MR images. Methods Free-breathing 3-dimensional Dixon MR data were acquired, retrospectively binned into multiple respiratory and cardiac motion states, and split into fat and water fraction using a model-based reconstruction framework. From the dynamic MR reconstructions, both a non-rigid cardiorespiratory motion model and a motion-resolved attenuation map were generated and applied to the PET data to improve image quality. The approach was tested in 10 patients and focal tracer hotspots were evaluated concerning their target-to-background ratio, contrast-to-background ratio, and their diameter. Results MR-based motion models were successfully applied to compensate for physiological motion in both PET and MR. Target-to-background ratios of identified plaques improved by 7 ± 7%, contrast-to-background ratios by 26 ± 38%, and the plaque diameter decreased by −22 ± 18%. MR-based dynamic attenuation correction strongly reduced attenuation correction artefacts and was not affected by stent-related signal voids in the underlying MR reconstructions. Conclusions The MR-based motion correction framework presented here can improve the target-to-background, contrast-to-background, and width of focal tracer hotspots in the coronary system. The dynamic attenuation correction could effectively mitigate the risk of attenuation correction artefacts in the coronaries at the lung-soft tissue boundary. In combination, this could enable a more reproducible and reliable plaque localisation.

Adenoid measurement accuracy: A comparison of lateral skull film, flexible endoscopy, and intraoperative rigid endoscopy (gold standard)

2021 ◽  
Author(s):  
Nattha Pisutsiri ◽  
Vannipa Vathanophas ◽  
Panrasee Boonyabut ◽  
Sirion Tritrakarn ◽  
Nichanun Vitayaudom ◽  
...  
Keyword(s):  
Gold Standard ◽  
Measurement Accuracy ◽  
Flexible Endoscopy ◽  
Rigid Endoscopy
Sign in / Sign up

Export Citation Format

Share Document