الفهرس 
Introduction and Review of LiteratureOnly 14 pages are availabe for public view
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Abstract
The purpose of this study was to evaluate the impact of field of view on cone beam computed tomography voxel density value. It was a systematic review that looked at three databases Medline, Scopus and Embase. After several systematic steps, including selecting studies that match the characteristics required for the study, and then removing repeated studies among the databases. Numerous studies in literature examined the factors influencing the image quality in the CBCT imaging modality. Our research summed in total 13405 studies, 10279 from Pub Med and 1337 from Cochrane and 1789 from Embase. 13000 duplicates digitally and manually have been removed; the remaining articles were 405. Search in first stage was by the titles and excluded 120 papers while left 285 articles, then search in the second stage done by abstracts which excluded 200 abandoning 85 to be evaluated in the final stage of search as shown in table 1. The manuscript was included and downloaded for further study at the final stage if the abstract at this stage was ambiguous or produced an equivocal result.7 papers out of 85 were the outcome of the last stage as shown in figure 1 the PRISMA Flow chart. The included seven research papers underwent a data extraction step in which the study was summarized in a table with the following headings: title, first author, name of the journal, year of publication, number and kind of machines used as shown in table 3. These articles also underwent a process of risk of bias assessment as shown in table 2.
Multiple investigations have focused on examining the image quality parameters of CBCT to allow the dentist to benefit from its accuracy and potentiality to the maximum. One of the most important determinants that have been looked over was FOV as it was found to be directly connected to voxel density value, moreover the patient radiation exposure.
In the time of assessment, the impact of FOV on VDV and so the image quality, some investigators have fixed all other parameters that could interfere with the measurement of FOV effect, hence they got the most accurate results could be achieved.
Other examiners could not achieve this results as long as they could not fix all other parameters interlacing with the FOV due to various reasons, overlapping the voxel size factor with the FOV parameter, deficit of certain voxel sizes in different FOVs or limited FOV sizes in certain types of used machines, hence their results were ambiguous and need further investigation for its reliability.
Finally, the only thing agreed upon by all the studies included in our systematic review was the importance of the FOV as a primary substational parameter affecting the image quality of CBCT and the
Interest in choosing the smallest possible field of view suitable for medical need in clinics to obtain the highest possible quality and the least exposure of the patient to radiation.
As well as researchers concerned with this factor phrased that it should be chosen as small as possible terminating the reason to attain the best resolution required and to the ALARA concept.