8/24/2023 0 Comments Metaimage volumeMake a video tutorial of the presented exampleĪdd scale parameter, in case when ct-image data and FE mesh are defined in different units (e.g. Kelvin Smith PhD Scholarship is acknowledged for providing financial support for this research. The authors are particularly grateful to the staff of the Small Animal Hospital, where the CT scans of the equine metacarpal bone were performed. ![]() This user module has been co-developed by the School of Engineering and the Weipers Centre Equine Hospital, School of Veterinary Medicine at the University of Glasgow. Contact us cmatg if you need any help or comments. If you like to work and modify this user module, you can fork this repository, do pull requests, see. Feel free to add changes, including improving this documentation. If you like contribute to this module (or MoFEM library) you are welcome. Subsequently, parameter study procedure presented for the small sphere example can be followed, in order to achieve similar mass of the model as the actual object (if can be measured). Results with increased order of approximation (left) and density gradient on cross section of a mapped bone (right) With a little effort CT-scan data can be resampled, cropped or even created e.g. It is extremly easy to use and extendable. For such purposes simple script mhd_merger.cpp was implemented. Subsequently, all this data has to be merged to obtain one consistent image for the FE model or density mapping. Instead, multiple indvidual scans can be performed in order to collect all required data. Sometimes it is impossible to scan long object in a CT-scanner with high resolution at once. The approach involves minimizing the following expression:į=\int_ In order to produce smooth, continuous (H1 space) density field least squares approximation is proposed. Distance of the integration points is calculated in BoneRemodeling::SurfaceKDTree class, subsequently it is used for density calculation at Gauss points in BoneRemodeling::OpCalulatefRhoAtGaussPts. Thanks to this, voxels involved into Partial Volume Effects will not be taken into consideration during collection data for integration points. When -dist_tol parameter is used, sampling cube at every integration close to the mesh surface will be shifted by value equal to -cube_size defined. Sampling cubes on the surface of mesh are shifted towards inside of the object. For example:Įffect of the dist_tol parameter. For density mapping simple MetaImage is used, its consists raw file that stores value of each voxel and MetaHeader file (. ![]() MetaImage is the text-based tagged file format for medical images included in MoFEM library. All input files used in this example can be found in the example directory. Subsequently two parameters (a,b) for linear image data - density field relation has to by defined, otherwise direct CT values from the image will be mapped.įollowing description and line commands are in presumption that users parent working directory is users_modules/bone_remodelling/ in build directory. 3D Slicer or by the conversion of standard DICOM format to Metafile by means of many available converters, like MRIConvert. It can be usually exported from the program that was used for segmentation e.g. In order to conduct mapping the user has to provide CT scan data in. ![]() raw (3D image) and corresponding finite elements mesh (. This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.Workflow diagram.
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