Visual Support for Interactive Post‐Interventional Assessment of Radiofrequency Ablation Therapy

Rieder, Christian; Weihusen, Andreas; Schumann, Christian; Zidowitz, Stephan; Peitgen, Heinz‐Otto

doi:10.1111/j.1467-8659.2009.01665.x

Cited by 28 publications

(23 citation statements)

References 27 publications

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“…In the research of Rieder et al [45], the tumour map is used as a visualisation and interaction technique for evaluation of post-interventional coagulation areas resulting from radiofrequency ablation. Based on our previous studies of the comparison of MWA and radiofrequency ablation [46], we consider that this tumour mapping technique is equally applicable to evaluating post-interventional coagulation areas resulting from MWA.…”

Section: Planning Navigation and Evaluationmentioning

confidence: 99%

“…This zone is the optimal simulation MWA result inside the safety margin. Based on the research of Rieder et al [45], the GUI of 3D visualisation for operational evaluation is shown in Figure 7.…”

Section: Planning Navigation and Evaluationmentioning

confidence: 99%

“…A safety margin is regarded as 5 mm around the tumour surface in the evaluation system for MWA. To evaluate the simulation MWA result, three coagulation zones in the spatial extent of the tumour are determined based on the research of Rieder et al [45] (see Figure 6). The traffic light colour scheme is also used to describe the ablation state.…”

Section: Planning Navigation and Evaluationmentioning

confidence: 99%

“…The tumour map is a pseudo-cylindrical mapping of the tumour surface onto a 2D image. This technique is used for a combined visualisation of all ablation zones of the tumour allowing a reliable therapy evaluation [45]. A safety margin is regarded as 5 mm around the tumour surface in the evaluation system for MWA.…”

Section: Planning Navigation and Evaluationmentioning

confidence: 99%

See 3 more Smart Citations

A simulator for percutaneous hepatic microwave thermal ablation under ultrasound guidance

Xue

Wang

et al. 2014

International Journal of Hyperthermia

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The purpose of this study was to provide a simulation therapy environment for microwave thermal ablation (MWA) under the guidance of ultrasound, and to present an inexpensive and portable simulator built on real patient-based pre-operative computed tomography (CT) data. We established an experimental simulation system for teaching MWA and present the results of a preliminary evaluation of the simulator's realism and utility for training. The system comprises physical elements of an electromagnetic tracking device and an abdominal phantom, and software elements providing three-dimensional (3D) image processing tools, real-time navigation functions and objective evaluation function module. Details of the novel aspects of this system are presented, including a portable electromagnetic tracking device, adoption of real patient-based pre-operative CT data of liver, operation simulation of MWA, and recording and playback of the operation simulation. Patients with liver cancer were selected for evaluation of the clinical application value of the experimental simulation system. A total of 50 consultant interventional radiologists and 20 specialist registrars in radiology rated the simulator's hardware reality and overall ergonomics. Results show that the simulator system we describe can be used as a training tool for MWA. It enables training with real patient cases prior to surgery, and it can provide a realistic simulation of the actual procedure.

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Section: Planning Navigation and Evaluationmentioning

confidence: 99%

Section: Planning Navigation and Evaluationmentioning

confidence: 99%

Section: Planning Navigation and Evaluationmentioning

confidence: 99%

Section: Planning Navigation and Evaluationmentioning

confidence: 99%

See 2 more Smart Citations

A simulator for percutaneous hepatic microwave thermal ablation under ultrasound guidance

Xue

Wang

et al. 2014

International Journal of Hyperthermia

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“…As soon as the analysis of the spike signals indicates that the MER electrodes are in the target region, green beads are rendered that draw attention to those structures. Furthermore, this color coding resembles the traffic light color scheme proposed by Rieder et al [30], which intuitively assigns green to good areas, while red is assigned to bad areas. To further reduce visual clutter only one bead is rendered for all electrodes.…”

Section: Additions To the Contextual Viewmentioning

confidence: 99%

Guiding Deep Brain Stimulation interventions by fusing multimodal uncertainty regions

Böck

Lang²,

Evangelista

et al. 2013

2013 IEEE Pacific Visualization Symposium (PacificVis)

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Deep Brain Stimulation (DBS) is a surgical intervention that is known to reduce or eliminate the symptoms of common movement disorders, such as Parkinson's disease, dystonia, or tremor. During the intervention the surgeon places electrodes inside of the patient's brain to stimulate specific regions. Since these regions span only a couple of millimeters, and electrode misplacement has severe consequences, reliable and accurate navigation is of great importance. Usually the surgeon relies on fused CT and MRI data sets, as well as direct feedback from the patient. More recently Microelectrode Recordings (MER), which support navigation by measuring the electric field of the patient's brain, are also used. We propose a visualization system that fuses the different modalities: imaging data, MER and patient checks, as well as the related uncertainties, in an intuitive way to present placement-related information in a consistent view with the goal of supporting the surgeon in the final placement of the stimulating electrode. We will describe the design considerations for our system, the technical realization, present the outcome of the proposed system, and provide an evaluation.

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Characterization of 2450‐MHz microwave thermal coagulation zone based on characteristic length growth model and shape variation factor

Gao

Wang

et al. 2019

Int J RF Microw Comput Aided Eng

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It is critical for microwave ablation (MWA) treatment planning to evaluate the changes of thermal coagulation zones. In MWA procedures, the shapes and sizes of thermal coagulation zones are gradually evolving over time. To this end, a novel characterization and mapping method of thermal coagulation zones is presented in this article. Firstly, finite element method (FEM) models of temperature distributions for 40, 45, 50, 55, and 60 W microwave ablations were built to derive thermal ablation data of ex vivo porcine livers and were compared with experimental results. Secondly, growth models of characteristic lengths were fitted. Finally, characterization functions of thermal coagulation zones were developed using these growth models. In addition, shape variation factors were incorporated to handle the minor shape variations of thermal coagulation zones. Experimental results showed that these characterization functions could accurately represent the changes of thermal coagulation zones. The standard deviations between prediction results and simulated values were less than 1 mm. The comparative results were statistically analyzed by paired t test (P > 0.05), indicating no significant differences. The proposed method can simply and effectively predict the changes of MWA coagulation zones with time, thus providing reliable coagulation dimensions for the thermal ablation therapies. K E Y W O R D S2-D mapping, coagulation zone, growth model, microwave ablation, shape variation factor 1 | INTRODUCTION MWA has become a widely accepted minimally-invasive procedure for the treatment of liver tumors, 1 with benefits of faster heating rates, larger coagulation zones, and shorter treatment time. 2 All tumor cells are destroyed by high-frequency electromagnetic waves emitted from a thin microwave (MW) antenna. Common clinical MWA devices include 915-and 2450-MHz applicators. However, the efficacy of MWA treatment is still left to the experiences of clinicians and the applications of medical imaging techniques. 3 Open problems delaying MWA clinical applications are mainly linked to the inability to accurately predict and control the growing coagulation zone. 4 For most ablative techniques such as MWA and RFA, thermal-induced tumor coagulation necrosis will occur instantly at temperatures of 55 C or higher. 5,6 In the treatment of liver tumors, the temperature of 54 C is often selected as the thermal coagulation threshold. 7,8 Therefore, in this work, we focus on accurately characterizing the shapes and sizes of 54 C isothermal surface (IS-54) to ensure the success of the treatment of liver tumors.MWA treatment planning is important for liver tumor thermal ablations. The optimized treatment schemes require "conformal" coverage of the tumors, with a safety margin of 5 to 10 mm, and minimized damages of surrounding normal tissues. 9 In the current MWA treatment planning, the estimation of thermal coagulation zones is questionable, because only some simplified coagulation models are superimposed on the liver tumors to obtain the abla...

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Visual Support for Interactive Post‐Interventional Assessment of Radiofrequency Ablation Therapy

Cited by 28 publications

References 27 publications

A simulator for percutaneous hepatic microwave thermal ablation under ultrasound guidance

A simulator for percutaneous hepatic microwave thermal ablation under ultrasound guidance

Guiding Deep Brain Stimulation interventions by fusing multimodal uncertainty regions

Characterization of 2450‐MHz microwave thermal coagulation zone based on characteristic length growth model and shape variation factor

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