30 June 1993 Synthetic tomographic image phantom for 3D validation
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Abstract
Fabricated anatomic models are used in presurgical planning and in the creation of custom cranial prostheses. To more carefully examine the differences between the original bone geometry and the fabricated model, we created a synthetic digital image phantom composed of hemi-spherical and hemi- parallelpiped solids rendered into a multi-image CT volume dataset. The computer program that created the phantom allows the dataset to contain an unlimited number of these solids either isolated or overlapping. Because of the image element's simple geometry, we can calculate the theoretical volume and measure the rasterized (sampled) volume during 3-D image synthesis. Subsequent reconstruction and measurement provides a means to determine the 3- D reconstruction volume, surface area, and linear measurement error. The phantom dataset (28 slices of a three hemispheres and one hemi-parallelpiped with .5 X .5 X 1.5 millimeter voxels) yielded 212, 342 surface triangles when subjected to 3-D segmentation and surface reconstruction. A rapid prototyping model was created and measurements taken to compare the accuracy and precision of the model process. These measurements are compared with an actual patient skull bone model and a scan of a dried mandible to obtain a partitioning of the error. All tests showed an accuracy of less than .55 millimeter (< 1%).
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Nicholas J. Mankovich, Howard Baik, Hans A. Baumgartner, John B. Hiller, "Synthetic tomographic image phantom for 3D validation", Proc. SPIE 1897, Medical Imaging 1993: Image Capture, Formatting, and Display, (30 June 1993); doi: 10.1117/12.146964; https://doi.org/10.1117/12.146964
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