Biomechanical simulation of the vitreous humor in the eye using an Enhanced ChainMail Algorithm

Schill, Markus A.; Gibson, Sarah F. Frisken; Bender, Hans-Joachim; Männer, Reinhard

doi:10.1007/bfb0056254

Cited by 29 publications

(31 citation statements)

References 3 publications

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“…Moreover, the dependency of propagation speed on material stiffness has to be taken into account. This is achieved by prioritizing the deformation propagation through chainmail elements of higher stiffness [3].…”

Section: Methodsmentioning

confidence: 99%

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Tissue-specific transformation model for CT-images

Bartelheimer

Teske

Bendl

et al. 2017

Current Directions in Biomedical Engineering

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During radiotherapy, posture changes and volume changing deformations like growing or shrinking tissue result in anatomical deformations. The basis for investigating the impact of such deformations on dose uncertainties, are model-based tools for deformation analysis. In this context, we propose a transformation model based on the information of CT-images, which allows an on-the-fly calculation of voxel volumes. Our model is based on the concept of the chainmail algorithm and describes deformation on voxellevel. With an exemplary input of a set of landmark pairs, generated by a kinematic head-and-neck skeleton model, CTimages (512x512x126 voxel) can be deformed with an onthe-fly volume calculation in less than 70s. The volume calculation delivers insight into model-characteristic volume changes and is a prerequisite for implementing tissue growth and shrinkage.

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Section: Methodsmentioning

confidence: 99%

“…It was enhanced to handle heterogeneous tissue [3] with material properties assigned according to pixel densities in medical images [4]. A limitation of the above chainmail algorithms is the inability to model inter-element rotation.…”

Section: Introductionmentioning

confidence: 99%

Tissue-specific transformation model for CT-images

Bartelheimer

Teske

Bendl

et al. 2017

Current Directions in Biomedical Engineering

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“…Based on 3D-ChainMail [2] an Enhanced ChainMail algorithm for the simulation of inhomogeous materials was developed [8]. This algorithm was successfully tested and will be used in the simulator for the modeling of the vitreous humor.…”

Section: Biomechanicsmentioning

confidence: 99%

EyeSi – A Simulator for Intra-ocular Surgery

Schill

Wagner

Hennen

et al. 1999

Medical Image Computing and Computer-Assisted Intervention – MICCAI’99

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Abstract. We present a computer-based medical workstation for the simulation of a vitrectomy that allows training and rehearsal of eye surgeons. The surgeon manipulates two original instruments inside a cardanically suspended mechanical model of the eye. The instrument positions are tracked by CCD cameras and monitored by a PC which then renders the scenery using a computer graphical model of the eye and the instruments. Stereoscopic images are presented to the user through two small LCD displays that are mounted to the system and emulate the stereo microscope used in real operations. The simulator offers the training of intra-ocular navigation as well as first approaches to interaction with pathological tissues using mass-spring and 3D-ChainMail models. All operations (tracking, rendering, collision detection, tissue manipulation) are computed in real-time on a PC.

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“…As the complication rate depends on the level of experience of the surgeon in question, it is desirable to learn complicated microsurgical steps in vitreoretinal surgery in experimental models prior to performing surgery in patients. It was therefore the purpose of the present study to evaluate the efficacy of a computerized in vitro training device intended to help inexperienced ophthalmic surgeons gain experience and skills in the early phase of their surgical learning period (Schill et al 1998(Schill et al , 1999(Schill et al , 2000Wagner et al 2001). …”

Section: Introductionmentioning

confidence: 99%

Computer‐assisted training system for pars plana vitrectomy

Jonas

Rabethge

Bender

2003

Acta Ophthalmologica Scandinavica

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ABSTRACT.Purpose: To evaluate whether microsurgical steps in vitreoretinal surgery can be taught by a computer-assisted training system. Methods: This prospective, randomized experimental study included 14 ophthalmic residents and medical students who were completely inexperienced in microsurgery. They were randomized into two groups. The study group underwent training programmes in a computer-assisted training system for simulation of pars plana vitrectomy. The control group did not participate in any in vitro training. In the second phase of the study, participants of both groups performed a pars plana vitrectomy in three pig eyes, which included picking a metallic foreign body from the retinal surface. Results: The amount of retinal detachment and the number of retinal defects at the end of the vitrectomies were smaller, the time needed to remove the foreign body was shorter, the number of retinal lesions associated with the foreign body removal was lower, and the mark given was better in the trained study group than in the untrained group. The relatively small number of study participants did not allow the differences between the study and control groups to reach the 5% level of error probability. Conclusions: In an animal model, training by a computer-based medical work station for simulation of pars plana vitrectomy showed better outcome measures for trained study participants compared with untrained study participants. Future studies may show whether further refinements of such training programmes will result in statistically significantly better results in surgical outcome parameters.

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Biomechanical simulation of the vitreous humor in the eye using an Enhanced ChainMail Algorithm

Cited by 29 publications

References 3 publications

Tissue-specific transformation model for CT-images

Tissue-specific transformation model for CT-images

EyeSi – A Simulator for Intra-ocular Surgery

Computer‐assisted training system for pars plana vitrectomy

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