Artifact quantification of venous stents in the MRI environment: Differences between braided and laser-cut designs

Venous thromboembolism is associated with significant morbidity and mortality if left untreated. Anticoagulation is the cornerstone of treatment. Venous stents are a relatively newer entity that are increasingly being used to treat venous stenosis/occlusion. It is a safe procedure, but complications include vein rupture, arterial puncture, retroperitoneal bleeding, and in-stent thrombosis. Stent migration is a rare but potentially fatal complication. We present a case of venous stent embolization to the heart that presented as a non-ST segment elevation myocardial infarction.

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Transforming a pre‐existing MRI environment into an interventional cardiac MRI suite.

Journal of Cardiovascular Electrophysiology ◽

10.1111/jce.15128 ◽

2021 ◽

Author(s):

Geertruida P. Bijvoet ◽

Robert J. Holtackers ◽

Jouke Smink ◽

Tom Lloyd ◽

Cristy L.M. den Hombergh ◽

...

Keyword(s):

Cardiac Mri ◽

Mri Environment

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Robot-assisted MRI-guided prostatic interventions

Robotica ◽

10.1017/s026357470999066x ◽

2009 ◽

Vol 28 (2) ◽

pp. 215-234 ◽

Cited By ~ 22

Author(s):

Andrew A. Goldenberg ◽

John Trachtenberg ◽

Yang Yi ◽

Robert Weersink ◽

Marshall S. Sussman ◽

...

Keyword(s):

Thermal Ablation ◽

Pulse Sequences ◽

Robot Assisted ◽

Surgical Ablation ◽

Image Guided ◽

Surgical Tool ◽

Mri Environment ◽

Focal Ablation ◽

Mri Guided ◽

Magnetic Resonance Imaging Mri

SUMMARYThis paper reports on recent progress made toward the development of a new magnetic resonance imaging (MRI)-compatible robot-assisted surgical system for closed-bore image-guided prostatic interventions: thermal ablation, radioactive seed implants (brachytherapy), and biopsy. Each type of intervention will be performed with a different image-guided, robot-based surgical tool mounted on the same MRI-guided robot through a modular trocar. The first stage of this development addresses only laser-based focal ablation. The robot mechanical structure, modular surgical trocar, control architecture, and current stage of performance evaluation in the MRI environment are presented. The robot actuators are ultrasonic motors. A methodology of using such motors in the MRI environment is presented. The robot prototype with surgical ablation tool is undergoing tests on phantoms in the MRI bore. The tests cover MRI compatibility, image visualization, robot accuracy, and thermal mapping. To date, (i) the images are artifact- and noise-free for certain scanning pulse sequences; (ii) the robot tip positioning error is less than 1.2 mm even at positions closer than 0.3 m from the MRI isocenter; (iii) penetration toward the target is image-monitored in near-real time; and (iv) thermal ablation and temperature mapping are achieved using a laser delivered on an optical fiber and MRI, respectively.

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Abstract No. 141 Double-barrel iliocaval reconstruction using novel closed-cell dedicated venous stents

Journal of Vascular and Interventional Radiology ◽

10.1016/j.jvir.2021.03.147 ◽

2021 ◽

Vol 32 (5) ◽

pp. S63

Author(s):

R. Korff ◽

J. Titano ◽

V. Bishay ◽

A. Fischman ◽

F. Nowakowski ◽

...

Keyword(s):

Closed Cell ◽

Venous Stents

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Radiographic Findings of Distressed Venous Stents and Inferior Vena Cava Filters: Clinical Implications

American Journal of Roentgenology ◽

10.2214/ajr.16.17750 ◽

2017 ◽

Vol 209 (5) ◽

pp. 1150-1157

Author(s):

Jeffrey Forris Beecham Chick ◽

Steven D. Abramowitz ◽

Matthew L. Osher ◽

Minhaj S. Khaja ◽

Kyle J. Cooper ◽

...

Keyword(s):

Inferior Vena Cava ◽

Inferior Vena ◽

Vena Cava ◽

Clinical Implications ◽

Radiographic Findings ◽

Inferior Vena Cava Filters ◽

Vena Cava Filters ◽

Venous Stents

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Large-scale functional integration, rather than functional dissociation along dorsal and ventral streams, underlies visual perception and action

10.1101/609487 ◽

2019 ◽

Author(s):

Dipanjan Ray ◽

Nilambari Hajare ◽

Dipanjan Roy ◽

Arpan Banerjee

Keyword(s):

Visual Perception ◽

Large Scale ◽

Premotor Cortex ◽

Functional Integration ◽

Predictive Coding ◽

Dorsal Stream ◽

Brain Regions ◽

Neural Pathways ◽

Healthy Human ◽

Mri Environment

AbstractVisual dual stream theory posits that two distinct neural pathways of specific functional significance originate from primary visual areas and reach the inferior temporal (ventral) and posterior parietal areas (dorsal). However, there are several unresolved questions concerning the fundamental aspects of this theory. For example, is the functional dissociation between ventral and dorsal stream driven by features in input stimuli or is it driven by categorical differences between visuo-perceptual and visuo-motor functions? Is the dual stream rigid or flexible? What is the nature of the interactions between two streams? We addressed these questions using fMRI recordings on healthy human volunteers and employing stimuli and tasks that can tease out the divergence between visuo-perceptual and visuo-motor models of dual stream theory. fMRI scans were repeated after seven practice sessions that were conducted in a non-MRI environment to investigate the effects of neuroplasticity. Brain activation analysis supports an input-based functional dissociation and existence of context-dependent neuroplasticity in dual stream areas. Intriguingly, premotor cortex activation was observed in the position perception task and distributed deactivated regions were observed in all perception tasks thus, warranting a network level analysis. Dynamic causal modelling (DCM) analysis incorporating activated and deactivated brain areas during perception tasks indicates that the brain dynamics during visual perception and actions could be interpreted within the framework of predictive coding. Effectively, the network level findings point towards the existence of more intricate context-driven functional networks selective of “what” and “where” information rather than segregated streams of processing along ventral and dorsal brain regions.

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Choosing the Most Appropriate Treatment Option for Pelvic Venous Disease: Stenting versus Embolization

Seminars in Interventional Radiology ◽

10.1055/s-0041-1727104 ◽

2021 ◽

Vol 38 (02) ◽

pp. 182-188

Author(s):

Mari E. Tanaka ◽

Oleksandra Kutsenko ◽

Gloria Salazar

Keyword(s):

Treatment Option ◽

Pelvic Pain ◽

Chronic Venous Disease ◽

Venous Disease ◽

Central Venous ◽

Central Venous Stenosis ◽

Appropriate Treatment ◽

Ongoing Development ◽

Venous Stents ◽

Vein Reflux

AbstractPelvic venous disease (PeVD) in women encompasses a wide variety of entities all resulting in pelvic pain and varices. Successful treatment with percutaneous interventions is dependent on identifying underlying factors contributing to the disease and addressing them with either embolization of incompetent veins or stenting for venous stenoses. There are a multitude of embolization methods with marked practice heterogeneity. Moreover, with the ongoing development of dedicated venous stents in the treatment of chronic venous disease, there are more opportunities to consider this modality for the treatment of PeVD, as many patients present with combined vein reflux and central venous stenosis. The necessity to address both and the order of interventions in these patients is still to be elucidated. Here, we describe when to choose stenting or embolization for PeVD, their limitations, and our practice and identify further areas of research in this field.

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