Abstract
In this work we calculate the ratio between scattered and transmitted photons (STRR) by a water cylinder reaching a detector matrix element (DME) in a flat array of detectors, similar to the used in cone beam tomography (CBCT), as a function of the field of view (FOV) and the irradiated volume of the scanned object. We perform the calculation by obtaining an equation to determine the scattered and transmitted radiation and building a computer code in order to calculate the contribution of all voxels of the sample. We compare calculated results with the shades of gray in a central slice of a tomography obtained from a cylindrical glass container filled with distilled water.The tomography was performed with an I-CAT tomograph (Imaging Science International), from the Department of Dental Clinic – Oral Radiology, Universidade Federal de Juiz de Fora. The shade of gray (voxel gray value – VGV) was obtained using the software provided with the I-CAT.The experimental results show a general behavior compatible with theoretical previsions attesting the validity of the method used to calculate the scattering contributions from simple scattering theories in cone beam tomography.The results also attest to the impossibility of obtaining Hounsfield values from a CBCT.
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