Towards a realistic echographic simulator

d'Aulignac, D.; Laugier, Christian; Troccaz, Jocelyne; Vieira, Sandra

doi:10.1016/j.media.2005.02.001

Cited by 17 publications

(6 citation statements)

References 13 publications

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“…Training simulators are currently used in many areas such as aeronautics [10], and also in medicine as an instruction tool or as a medical support for surgery [11], [12], [13], [14], [15]. In the field of obstetrics and gynecology, a large survey of existing medical training simulators has been conducted by Gardner [16], [17] and one more specific to childbirth modeling by Li [6].…”

Section: State Of the Artmentioning

confidence: 99%

Biomechanical simulation of the fetal descent without imposed theoretical trajectory

Buttin

Zara

Shariat

et al. 2013

Computer Methods and Programs in Biomedicine

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Abstract-The medical training concerning childbirth for young obstetricians involves performing real deliveries, under supervision. This medical procedure becomes more complicated when instrumented deliveries requiring the use of forceps or suction cups become necessary. For this reason, the use of a versatile, configurable childbirth simulator, taking into account different anatomical and pathological cases, would provide an important benefit in the training of obstetricians, and improve medical procedures. The production of this type of simulator should be generally based on a computerized birth simulation, enabling the computation of the reproductive organs of the parturient woman and fetal interactions as well as the calculation of efforts produced during the second stage of labor. However, apart from the commercially available robotized dummy simulators, very few virtual training tools using computational technologies have been developed. Unfortunately, all of these simulators approximate the expulsive forces of childbirth by imposing a pre-computed fetal trajectory. They have rather limited possibilities and would be unlikely to meet the versatility requirements described above. Besides, much research work has been carried out to simulate precisely birth-induced pelvic floor dysfunction and organ prolapse, with damage to levator ani muscles. All these simulators perform a detailed modeling of the levator ani muscles in interaction with a rigid fetal head, at high computational cost. However, they do not take into consideration many pelvic organs involved in the process of childbirth.To reconcile the accuracy of results and computation time, we propose an approach that lies between the two classes of simulator described above in order to perform a realistic simulation of the descent of the fetus through the birth canal. In this paper we present the first stage of this work by focusing on the geometrical and biomechanical modeling of the main organs involved (i. e. the uterus, abdomen and pelvis of the parturient woman interacting with the fetus) based on the laws of continuum mechanics. At this stage, to verify the correctness of our hypothesis, we use finite element analysis, because of its reliability, precision and stability. In sum, our study improves work performed on childbirth simulators because:• our childbirth model takes into account all the major organs involved in birth process, thus enabling many childbirth scenarios to be considered, • fetal head is not treated as a rigid body and its motion is computed by taking into account realistic boundary conditions, i. e. we do not impose a pre-computed fetal trajectory, • we take into account the cyclic uterine contractions as well as voluntary efforts produced by the muscles of the abdomen, • a slight pressure is added inside the abdomen, representing the residual muscle tone.

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Section: State Of the Artmentioning

confidence: 99%

Biomechanical simulation of the fetal descent without imposed theoretical trajectory

Buttin

Zara

Shariat

et al. 2013

Computer Methods and Programs in Biomedicine

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“…Fast synthesis of ultrasound images in soft tissues under deformation will facilitate the development of training simulators. With this goal, a DVT diagnosis simulator was proposed in [8], [9]. It simulates the probe pressure by first slicing an image from the 3D ultrasound data set and then applying a 2D elastic deformation using quadtree-splines to this image.…”

Section: Introductionmentioning

confidence: 99%

Fast B-Mode Ultrasound Image Simulation of Deformed Tissue

Göksel

Salcudean

2007

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Abstract-This paper presents a fast image synthesis procedure inside elastic volumes under deformation simulated by the finite element method (FEM). Given the node displacements of a mesh and the 3D image voxel data of a volume prior to deformation, the method maps the image pixels, to be synthesized, from the deformed configuration back to the nominal pre-deformed configuration, where the pixel intensities are obtained easily through interpolation in the regular-grid structure of the voxel volume. This mapping requires the identification of the mesh element enclosing each image pixel, in order to use its corresponding shape function for smooth interpolation. To accelerate this point location operation, a fast method of marking the projection of the deformed mesh on the image pixels at every frame is introduced.In order to evaluate our method, a deformable tissue phantom was constructed and its 3D ultrasound volume was acquired in its nominal state. B-mode images of the phantom were then synthesized under the simulated deformation of an ultrasound probe. Results show that realistic B-mode images can be simulated in real-time with the proposed technique, even under large deformations. The technique is also implemented on a real-time system for ultrasound exploration with deformation.

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“…In the literature, there have been image slicing implementations without taking deformation into account [5,7,8,9]. Also, there have been in-plane image deformation strategies for image registration, deformation correction for volume reconstruction [3,4], and a training simulation for DVT [10,11]. However, to the extent of our knowledge, our implementation is the first real-time image slicer inside 3D deformation models.…”

Section: Discussionmentioning

confidence: 99%

“…Due to speckle and other directional imaging artifacts, a deformed tissue does not necessarily generate the exact same nominal gray-values at its displaced position. Nevertheless, this assumption has been employed in many applications in the literature [3,4,5,7,8,9,10,11], with success. The speckle pattern (mainly its visual continuity) is also a major criterion in evaluating the realism of synthesized images.…”

Section: Discussionmentioning

confidence: 99%

“…Fast synthesis of ultrasound images in soft tissues under deformation will facilitate the development of training simulators. With this goal, a DVT diagnosis simulator was proposed in [10,11]. It simulates the probe pressure by first slicing an image from the 3D ultrasound data set and then applying a 2D in-plane elastic deformation using quadtree-splines to this image.…”

Section: Introductionmentioning

confidence: 99%

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Real-Time Synthesis of Image Slices in Deformed Tissue from Nominal Volume Images

Göksel

Salcudean

Medical Image Computing and Computer-Assisted Intervention – MICCAI 2007

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This paper presents a fast image synthesis procedure for elastic volumes under deformation. Given the node displacements of a mesh and the 3D image voxel data of an undeformed volume, the method maps the image plane pixels to be synthesized from the deformed configuration back to the nominal pre-deformed configuration, where the pixel intensities are obtained easily through interpolation in the regular-grid structure of the voxel volume. For smooth interpolation, this mapping requires the identification of the mesh element enclosing each image pixel. To accelerate this point location procedure, a fast method of marking the image pixels is employed by finding the intersection of the mesh and the image, and marking this intersection on the image pixels using Bresenham's line drawing algorithm. A deformable tissue phantom was constructed, it was modeled using the finite element method, and its 3D ultrasound volume was acquired in its undeformed state. Actual B-mode images of the phantom under deformation by the ultrasound probe were then compared with the corresponding synthesized images simulated for the same deformations. Results show that realistic images can be synthesized in real-time using the proposed technique.

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Towards a realistic echographic simulator

Cited by 17 publications

References 13 publications

Biomechanical simulation of the fetal descent without imposed theoretical trajectory

Biomechanical simulation of the fetal descent without imposed theoretical trajectory

Fast B-Mode Ultrasound Image Simulation of Deformed Tissue

Real-Time Synthesis of Image Slices in Deformed Tissue from Nominal Volume Images

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