Impact of field of view on Cone Beam Computed Tomography voxel density value: A Systematic review

Abstract

Objective: This systematic review was to criticize the impact of field of view on cone beam computed tomography voxel density value based on analysis of the literature reported the effect of field of view on cone beam computed tomography voxel density value directly or indirectly.Methods: Searches were done on Medline, Embase libraries via PubMed search engine, and on Cochrane library via its engine. Mesh keywords were used to ensure detection of potential variation. Considering the following criteria. Inclusion criteria: Studies with clear specifications of the machine used, with clear exposure parameters (Kvp, mA, FOV size and voxel size), having a gold standard for comparison. Exclusion criteria, Studies with fixed FOV. Review articles. Case study Results: Analysis of the search was done on two levels. The first was by titles and abstracts. The second, re-analysis of the accepted studies. Those included underwent data extraction, summarized in a table with headings: title, first author, journal, publication' year, machines' numbers, kind, and exposure parameters. Conclusion:Several points was as an answer for our research question. The field of view is one of the most important factors influencing VDV of CBCT and image quality. Regarding the size of FOV. It is directly proportional to the amount of radiation the patient expose to, it should be small to maximize spatial resolution, large enough to enclose the entire patient thus avoid the truncation of data in axial slice, cupping artifacts. Accuracy of VDV is related to the object location in the center of FOV.