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4 results on '"Kulik, Tomas"'

1. Towards Secure Digital Twins

Author

Kulik, Tomas, Gomes, Cláudio, Macedo, Hugo Daniel, Hallerstede, Stefan, Larsen, Peter Gorm, Margaria, Tiziana, and Steffen, Bernhard

Subjects
Security model, Cyber security, Digital twins
Abstract

Advanced digital technology is finding its way into industrial production and control systems. This led to development of further concepts such as digital shadow and digital twin. In the former an accurate model of the cyber-physical system (CPS) is used to monitor it virtually, while the latter provides a possibility to adapt the CPS’s behavior. These developments are often welcome from the operators perspective, however they also pose new challenges in terms of cyber security: an operator could be led to believe the system is operating correctly due to the represented digital image while the CPS is under a cyber attack. In this paper we investigate several cyber security challenges of the digital twin technology and discuss potential mitigations for these challenges based on well established practices within the area of industrial control systems. We further describe the potential cyber attacks and mitigations using a semi-formal notation based on problem frames, we suggest in order to simplify the communication about cyber security challenges of digital twins between different stakeholders. This is shown within a context of a small case study. Finally we outline areas of research for the development of secure digital twin technology.

Published
2022
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3. Periprocedural 3D imaging of the left atrium and esophagus: comparison of different protocols of 3D rotational angiography of the left atrium and esophagus in group of 547 consecutive patients undergoing catheter ablation of the complex atrial arrhythmias.

Author

Starek Z, Lehar F, Jez J, Wolf J, Kulik T, Zbankova A, and Novak M

Subjects
Aged, Atrial Fibrillation physiopathology, Body Mass Index, Computer Simulation, Contrast Media administration & dosage, Female, Heart Atria physiopathology, Humans, Iohexol administration & dosage, Iohexol analogs & derivatives, Male, Middle Aged, Models, Cardiovascular, Predictive Value of Tests, Reproducibility of Results, Retrospective Studies, Angiography methods, Atrial Fibrillation diagnostic imaging, Atrial Fibrillation surgery, Catheter Ablation, Esophagus diagnostic imaging, Heart Atria diagnostic imaging, Heart Atria surgery, Imaging, Three-Dimensional, Radiographic Image Interpretation, Computer-Assisted
Abstract

A new method in creating 3D models of the left atrium (LA) and esophagus before catheter ablation of atrial arrhythmias is 3D rotational angiography (3DRA) of the LA. The purpose of this retrospective study was to test various acquisition protocols of the 3DRA and attempt to define the parameters influencing the success of the protocols. From August 2010 to November 2014, 3DRA of the LA using the Philips Allura FD 10 X-ray system was performed in 547 consecutive patients using right atrial and left atrial protocols. Visualization of the esophagus was performed after oral administration of a contrast agent. Patients were monitored for success (creation of a useful 3D models) and evaluated for a number of parameters affecting the success of 3DRA. The success of the RA protocol was 88.89 % with and 91.91 % without esophagus imaging. The success of the LA protocol was 97.42 % with and 94.54 % without esophagus imaging. The only factor reducing the success of the RA protocol was BMI; the LA protocol was not influenced by any factor. Ventricular fibrillation induced in two patients was successfully treated with defibrillation. 3DRA of the LA is a reliable method that supports catheter ablation of complex atrial arrhythmias. The LA protocol with esophagus imaging was significantly more reliable than the RA protocol; the other protocols were comparable. The RA protocol may be negatively affected by high BMI. Simultaneous imaging of the esophagus is safe and feasible, and the LA protocol can be recommended.

Published
2016
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4. Rotational angiography of left ventricle to guide ventricular tachycardia ablation.

Author

Wolf J, Starek Z, Jez J, Lehar F, Lukasova M, Kulik T, and Novak M

Subjects
Aged, Contrast Media, Feasibility Studies, Female, Humans, Imaging, Three-Dimensional, Male, Middle Aged, Pilot Projects, Predictive Value of Tests, Radiographic Image Interpretation, Computer-Assisted, Treatment Outcome, Catheter Ablation, Coronary Angiography methods, Heart Ventricles diagnostic imaging, Heart Ventricles surgery, Radiography, Interventional methods, Tachycardia, Ventricular diagnostic imaging, Tachycardia, Ventricular surgery
Abstract

Three-dimensional rotational angiography (3 DRA) is a novel imaging method introduced to guide complex catheter ablations of the left atrium. Our aim was to investigate the feasibility of the method in visualization of left ventricular anatomy and to develop a corresponding protocol for guidance of ventricular tachycardia ablation. We performed 3D rotational angiography in 13 patients using a direct left atrial protocol for data acquisition and the 3D reconstruction of the left ventricle was achieved in all patients. Clinical data comparison has proved lower use of radiation and contrast medium during 3 DRA-guided ablations as compared to CT-guided procedures.

Published
2015
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