The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

C. Mautalen - One of the best experts on this subject based on the ideXlab platform.

  • Discrimination of total Body bone mineral density measured by dexa in vertebral osteoporosis
    Calcified Tissue International, 1995
    Co-Authors: A. Bagur, E. Vega, C. Mautalen
    Abstract:

    The assessment of bone mineral density (BMD) is the usual study to detect patients at risk for developing osteoporosis. The aim of this study was to compare the discriminative ability of total Body BMD and its different subregions with the more usual measurements of BMD of the lumbar spine and femoral neck in women with osteoporotic fractures of the spine. The BMD was determined in 61 osteoporotic (at least one vertebral wedge fracture visible in the lateral X-ray film of the thoracic or lumbar spine) and 61 age-matched control women. Measurements were made by dual X-ray absortiometry (DXA) with a total Body Scanner. The BMD of the osteoporotic women was significantly lower at all skeletal areas compared with control ( P

Wu Xian-feng - One of the best experts on this subject based on the ideXlab platform.

  • Virtual Simulation of 3D Whole Body Scanner
    Computer Simulation, 2004
    Co-Authors: Wu Xian-feng
    Abstract:

    With the advent of 3D in computer science, the function of 3D whole Body Scanner is more remarkable. The acquisition of 3D information of the Body surface is prior to the construction of 3D human Body models. In this paper, a system simulation method of the 3D whole Body Scanner based on the structured light is proposed. The image sequence with laser stripes is obtained by 3D Studio MAX. The sequence is from the motion of the Scanners. Then the 3D reconstruction is implemented via the simulation data. The key steps include the extraction of the stripe center (adaptive threshold method), the acquisition of range image, and the merge of the multi-Scanner data. The experimental results are satisfactory, and the complete contour line is obtained so that the simulation method is proved to be reasonable and effective.

Renée Lampe - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of adolescent idiopathic scoliosis from Body Scanner image by finite element simulations.
    PloS one, 2021
    Co-Authors: Alexander T. D. Grünwald, Susmita Roy, Ana Alves-pinto, Renée Lampe
    Abstract:

    Adolescent idiopathic scoliosis, is a three-dimensional spinal deformity characterized by lateral curvature and axial rotation around the vertical Body axis of the spine, the cause of which is yet unknown. The fast progression entails regular clinical monitoring, including X-rays. Here we present an approach to evaluate scoliosis from the three-dimensional image of a patient's torso, captured by an ionizing radiation free Body Scanner, in combination with a model of the ribcage and spine. A skeletal structure of the ribcage and vertebral column was modelled with computer aided designed software and was used as an initial structure for macroscopic finite element method simulations. The basic vertebral column model was created for an adult female in an upright position. The model was then used to simulate the patient specific scoliotic spine configurations. The simulations showed that a lateral translation of a vertebral Body results in an effective axial rotation and could reproduce the spinal curvatures. The combined method of three-dimensional Body scan and finite element model simulations thus provide quantitative anatomical information about the position, rotation and inclination of the thoracic and lumbar vertebrae within a three-dimensional torso. Furthermore, the simulations showed unequal distributions of stress and strain profiles across the intervertebral discs, due to their distortions, which might help to further understand the pathogenesis of scoliosis.

  • A Noninvasive 3D Body Scanner and Software Tool towards Analysis of Scoliosis
    BioMed research international, 2019
    Co-Authors: Susmita Roy, Alexander T. D. Grünwald, Ana Alves-pinto, Robert Maier, Daniel Cremers, Daniela Pfeiffer, Renée Lampe
    Abstract:

    Purpose. Children with neurological disorders, such as cerebral palsy (CP), have a high risk of developing scoliosis during growth. The fast progression of scoliosis implies in several cases frequent clinical and X-ray examinations. We present an ionizing radiation-free, noncontacting method to estimate the trajectory of the vertebral column and to potentially facilitate medical diagnosis in cases where an X-ray examination is not indicated. Methods. A Body Scanner and corresponding analysis software tools have been developed to get 3D surface scans of patient torsos and to analyze their spinal curvatures. The trajectory of the vertebral column has been deduced from the Body contours at different transverse sectional planes along the vertical torso axis. In order to verify the present methods, we have analyzed twenty-five torso contours, extracted from computer tomography (CT) images of patients who had a CT scan for other medical reasons, but incidentally also showed a scoliosis. The software tools therefore process data from the Body Scanner as well as X-ray or CT images. Results. The methods presented show good results in the estimations of the lateral deviation of the spine for mild and moderate scoliosis. The partial mismatch for severe cases is associated with a less accurate estimation of the rotation of the vertebrae around the vertical Body axis in these cases. In addition, distinct torso contour shapes, in the transverse sections, have been characterized according to the severity of the scoliosis. Conclusion. The hardware and software tools are a first step towards an ionizing radiation-free analysis of progression of scoliosis. However, further improvements of the analysis methods and tests on a larger number of data sets with diverse types of scoliosis are necessary, before its introduction into clinical application as a supplementary tool to conventional examinations.

Patrick B Wilson - One of the best experts on this subject based on the ideXlab platform.

A. Bagur - One of the best experts on this subject based on the ideXlab platform.

  • Discrimination of total Body bone mineral density measured by dexa in vertebral osteoporosis
    Calcified Tissue International, 1995
    Co-Authors: A. Bagur, E. Vega, C. Mautalen
    Abstract:

    The assessment of bone mineral density (BMD) is the usual study to detect patients at risk for developing osteoporosis. The aim of this study was to compare the discriminative ability of total Body BMD and its different subregions with the more usual measurements of BMD of the lumbar spine and femoral neck in women with osteoporotic fractures of the spine. The BMD was determined in 61 osteoporotic (at least one vertebral wedge fracture visible in the lateral X-ray film of the thoracic or lumbar spine) and 61 age-matched control women. Measurements were made by dual X-ray absortiometry (DXA) with a total Body Scanner. The BMD of the osteoporotic women was significantly lower at all skeletal areas compared with control ( P