Effect of the Field of View Size on CBCT Artifacts Caused by the Presence of Metal Objects in the Exomass

Background and Aim. This study aimed to assess the effect of the size of the field of view (FOV) on cone-beam computed tomography (CBCT) artifacts caused by metal objects in the exomass. Materials and Methods. In this in vitro experimental study, titanium implants, teeth with cobalt-chromium (Co-Cr)...

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Published in:International journal of dentistry 2022, Vol.2022, p.1-10
Main Authors: Safi, Yaser, Ghazizadeh Ahsaie, Mitra, Jafarian Amiri, Maede
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Language:English
Subjects:
Canine teeth
Chromium
Cobalt
Computed tomography
Dental implants
Mandible
Polypropylene
Potassium phosphate
Radiation
Scanners
Software
Teeth
Titanium
Tomography
Visual field
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description Background and Aim. This study aimed to assess the effect of the size of the field of view (FOV) on cone-beam computed tomography (CBCT) artifacts caused by metal objects in the exomass. Materials and Methods. In this in vitro experimental study, titanium implants, teeth with cobalt-chromium (Co-Cr) intracanal posts, and teeth with mesio-occluso-distal (MOD) amalgam restorations were placed in an empty socket of the extracted third molar of a human mandible. These metallic materials were differently arranged in the exomass (zone outside of the FOV). A polypropylene tube containing dipotassium phosphate was placed in the empty socket of the right canine tooth in a dry human mandible. CBCT scans were taken with a NewTom VGI (Verona, Italy) scanner using a 6 × 6 cm and an 8 × 8 cm FOV. The histogram tool of OnDemand software (Cybermed, Seoul, Korea) was used to select circles with a 1.5 mm diameter as the (ROI) at the center of the homogenous solution of dipotassium phosphate tube on the axial plane. The mean gray value (GV) and its standard deviation (SD) in the region of interest (ROI) were calculated (P>0.05). The data were analyzed by SPSS 26. Results. The reduction in the size of the FOV significantly decreased the mean GV (P
doi_str_mv 10.1155/2022/2071108
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This study aimed to assess the effect of the size of the field of view (FOV) on cone-beam computed tomography (CBCT) artifacts caused by metal objects in the exomass. Materials and Methods. In this in vitro experimental study, titanium implants, teeth with cobalt-chromium (Co-Cr) intracanal posts, and teeth with mesio-occluso-distal (MOD) amalgam restorations were placed in an empty socket of the extracted third molar of a human mandible. These metallic materials were differently arranged in the exomass (zone outside of the FOV). A polypropylene tube containing dipotassium phosphate was placed in the empty socket of the right canine tooth in a dry human mandible. CBCT scans were taken with a NewTom VGI (Verona, Italy) scanner using a 6 × 6 cm and an 8 × 8 cm FOV. The histogram tool of OnDemand software (Cybermed, Seoul, Korea) was used to select circles with a 1.5 mm diameter as the (ROI) at the center of the homogenous solution of dipotassium phosphate tube on the axial plane. The mean gray value (GV) and its standard deviation (SD) in the region of interest (ROI) were calculated (P&gt;0.05). The data were analyzed by SPSS 26. Results. The reduction in the size of the FOV significantly decreased the mean GV (P&lt;0.001). Metal objects in the exomass significantly decreased the mean GV (P&lt;0.001), and minimum mean GV and maximum SD were recorded for amalgam, followed by Co-Cr intracanal posts, and titanium implants. The unilateral presence of a metal object was associated with a higher mean GV and lower SD (P&lt;0.001). Conclusion. Using a smaller FOV increases the size of the exomass, which may negatively affect the image quality. Metal objects in the exomass decrease the GV of CBCT scans and adversely affect the image quality.</description><identifier>ISSN: 1687-8728</identifier><identifier>EISSN: 1687-8736</identifier><identifier>DOI: 10.1155/2022/2071108</identifier><language>eng</language><publisher>New York: Hindawi</publisher><subject>Canine teeth ; Chromium ; Cobalt ; Computed tomography ; Dental implants ; Mandible ; Polypropylene ; Potassium phosphate ; Radiation ; Scanners ; Software ; Teeth ; Titanium ; Tomography ; Visual field</subject><ispartof>International journal of dentistry, 2022, Vol.2022, p.1-10</ispartof><rights>Copyright © 2022 Yaser Safi et al.</rights><rights>Copyright © 2022 Yaser Safi et al. This is an open access article distributed under the Creative Commons Attribution License (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 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This study aimed to assess the effect of the size of the field of view (FOV) on cone-beam computed tomography (CBCT) artifacts caused by metal objects in the exomass. Materials and Methods. In this in vitro experimental study, titanium implants, teeth with cobalt-chromium (Co-Cr) intracanal posts, and teeth with mesio-occluso-distal (MOD) amalgam restorations were placed in an empty socket of the extracted third molar of a human mandible. These metallic materials were differently arranged in the exomass (zone outside of the FOV). A polypropylene tube containing dipotassium phosphate was placed in the empty socket of the right canine tooth in a dry human mandible. CBCT scans were taken with a NewTom VGI (Verona, Italy) scanner using a 6 × 6 cm and an 8 × 8 cm FOV. The histogram tool of OnDemand software (Cybermed, Seoul, Korea) was used to select circles with a 1.5 mm diameter as the (ROI) at the center of the homogenous solution of dipotassium phosphate tube on the axial plane. The mean gray value (GV) and its standard deviation (SD) in the region of interest (ROI) were calculated (P&gt;0.05). The data were analyzed by SPSS 26. Results. The reduction in the size of the FOV significantly decreased the mean GV (P&lt;0.001). Metal objects in the exomass significantly decreased the mean GV (P&lt;0.001), and minimum mean GV and maximum SD were recorded for amalgam, followed by Co-Cr intracanal posts, and titanium implants. The unilateral presence of a metal object was associated with a higher mean GV and lower SD (P&lt;0.001). Conclusion. Using a smaller FOV increases the size of the exomass, which may negatively affect the image quality. 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This study aimed to assess the effect of the size of the field of view (FOV) on cone-beam computed tomography (CBCT) artifacts caused by metal objects in the exomass. Materials and Methods. In this in vitro experimental study, titanium implants, teeth with cobalt-chromium (Co-Cr) intracanal posts, and teeth with mesio-occluso-distal (MOD) amalgam restorations were placed in an empty socket of the extracted third molar of a human mandible. These metallic materials were differently arranged in the exomass (zone outside of the FOV). A polypropylene tube containing dipotassium phosphate was placed in the empty socket of the right canine tooth in a dry human mandible. CBCT scans were taken with a NewTom VGI (Verona, Italy) scanner using a 6 × 6 cm and an 8 × 8 cm FOV. The histogram tool of OnDemand software (Cybermed, Seoul, Korea) was used to select circles with a 1.5 mm diameter as the (ROI) at the center of the homogenous solution of dipotassium phosphate tube on the axial plane. The mean gray value (GV) and its standard deviation (SD) in the region of interest (ROI) were calculated (P&gt;0.05). The data were analyzed by SPSS 26. Results. The reduction in the size of the FOV significantly decreased the mean GV (P&lt;0.001). Metal objects in the exomass significantly decreased the mean GV (P&lt;0.001), and minimum mean GV and maximum SD were recorded for amalgam, followed by Co-Cr intracanal posts, and titanium implants. The unilateral presence of a metal object was associated with a higher mean GV and lower SD (P&lt;0.001). Conclusion. Using a smaller FOV increases the size of the exomass, which may negatively affect the image quality. Metal objects in the exomass decrease the GV of CBCT scans and adversely affect the image quality.</abstract><cop>New York</cop><pub>Hindawi</pub><doi>10.1155/2022/2071108</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0003-3200-0905</orcidid><orcidid>https://orcid.org/0000-0001-7028-748X</orcidid><orcidid>https://orcid.org/0000-0002-0686-5879</orcidid><oa>free_for_read</oa></addata></record>
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source Wiley Online Library Open Access; Publicly Available Content Database; PubMed Central
subjects Canine teeth
Chromium
Cobalt
Computed tomography
Dental implants
Mandible
Polypropylene
Potassium phosphate
Radiation
Scanners
Software
Teeth
Titanium
Tomography
Visual field
title Effect of the Field of View Size on CBCT Artifacts Caused by the Presence of Metal Objects in the Exomass
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