Mr. Alexis Puvrez Profile

Alexis Puvrez

at KU Leuven

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Publications (2)

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SPIE Journal Paper | 29 May 2024

Phantom study of augmented reality framework to assist epicardial punctures

Kobe Bamps, Jeroen Bertels, Lennert Minten, Alexis Puvrez, Walter Coudyzer, Stijn De Buck, Joris Ector

JMI, Vol. 11, Issue 03, 035002, (May 2024) https://doi.org/10.1117/12.10.1117/1.JMI.11.3.035002

KEYWORDS: Augmented reality, Autoregressive models, Error analysis, Head-mounted displays, Computed tomography, Calibration, Skin, Electrocardiography, Accuracy assessment, 3D modeling

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PurposeThe objective of this study is to evaluate the accuracy of an augmented reality (AR) system in improving guidance, accuracy, and visualization during the subxiphoidal approach for epicardial ablation.ApproachAn AR application was developed to project real-time needle trajectories and patient-specific 3D organs using the Hololens 2. Additionally, needle tracking was implemented to offer real-time feedback to the operator, facilitating needle navigation. The AR application was evaluated through three different experiments: examining overlay accuracy, assessing puncture accuracy, and performing pre-clinical evaluations on a phantom.ResultsThe results of the overlay accuracy assessment for the AR system yielded 2.36±2.04 mm. Additionally, the puncture accuracy utilizing the AR system yielded 1.02±2.41 mm. During the pre-clinical evaluation on the phantom, needle puncture with AR guidance showed 7.43±2.73 mm, whereas needle puncture without AR guidance showed 22.62±9.37 mm.ConclusionsOverall, the AR platform has the potential to enhance the accuracy of percutaneous epicardial access for mapping and ablation of cardiac arrhythmias, thereby reducing complications and improving patient outcomes. The significance of this study lies in the potential of AR guidance to enhance the accuracy and safety of percutaneous epicardial access.

Proceedings Article | 3 April 2023 Poster + Paper

Augmented reality guidance platform for epicardial access: a phantom study

Kobe Bamps, Jeroen Bertels, Lennert Minten, Alexis Puvrez, Walter Coudyzer, Stijn De Buck, Joris Ector

Proceedings Volume 12466, 124661S (2023) https://doi.org/10.1117/12.2653902

KEYWORDS: Augmented reality, Autoregressive models, Calibration, Head-mounted displays, Skin, Ablation, Visualization, 3D tracking, Cameras, 3D modeling

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Percutaneous epicardial access for epicardial ablation and mapping of cardiac arrhythmias is being performed more and more often. Unfortunately, complications such as injury to surrounding structures have been reported. Despite the current imaging techniques, it is still difficult to guarantee sufficient ablation accuracy. Head-Mounted-Display (HMD) Augmented Reality (AR) overlay and guidance has the potential to reduce the risk of complications. The objective of this study was to evaluate the accuracy and performance of an AR-guided epicardial puncture for catheter ablation of ventricular tachycardia. An AR software tool was designed to render real-time needle trajectories and 3D patient-specific organs. Registration of preoperative data is realized by attaching four AR patterns to the skin of the patient. Needle tracking is realized by attaching one AR pattern to the end of the needle’s base. The ideal trajectory through the pericardial space and patient-specific organs was planned and segmented on preoperative CT. The application’s accuracy was evaluated in a phantom study. Seven operators performed needle puncture with and without the use of the AR system. Placements errors were measured on postprocedural CT. With the use of the proposed AR-based guidance, post procedure CT revealed an error at the puncture site of 3.67±2.78 mm. At the epicardial interface, the error increased to 7.78±2.36 mm. The angle of the actual trajectory deviated on average 4.82±1.48◦ from the planned trajectory. The execution time was on average 34.0 ± 25.1 s, hence introducing no significant delay at an overall superior performance level compared to without AR-guided puncturing. The proposed AR platform has the potential to facilitate percutaneous epicardial access for epicardial ablation and mapping of cardiac arrhythmias by improving needle insertion accuracy.

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