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Relationship between Hounsfield Unit in CT Scan and Gray Scale in CBCT.

Razi T, Niknami M, Alavi Ghazani F - J Dent Res Dent Clin Dent Prospects (2014)

Bottom Line: In this descriptive study, the head of a sheep was scanned with 3 CBCT and one medical CT scanner.Gray scales and HUs were detected on images.Results.

View Article: PubMed Central - PubMed

Affiliation: Assistant Professor, Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.

ABSTRACT
Background and aims. Cone-beam computed tomography (CBCT) is an imaging system which has many advantages over computed tomography (CT). In CT scan, Hounsfield Unit (HU) is proportional to the degree of x-ray attenuation by the tissue. In CBCT, the degree of x-ray attenuation is shown by gray scale (voxel value). The aim of the present study was to investigate the relationship between gray scale in CBCT) and Hounsfield Unit (HU) in CT scan. Materials and methods. In this descriptive study, the head of a sheep was scanned with 3 CBCT and one medical CT scanner. Gray scales and HUs were detected on images. Reconstructed data were analyzed to investigate relationship between CBCT gray scales and HUs. Results. A strong correlation between gray scales of CBCT and HUs of CT scan was determined. Conclusion. Considering the fact that gray scale in CBCT is the criteria in measurement of bone density before implant treatments, it is recommended because of the lower dose and cost compared to CT scan.

No MeSH data available.


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Mentions: In Newtom VG, R2 was calculated at 0.997 and the equation of the regression was HU = 14.621 + 1.088 × gray scale (Figure 1). In Scanora Soredex, R2 was estimated at 0.989 and the equation of the regression was HU = −24.052 + 1.146 × gray scale and the relationship was linear (Figure 2). In Planmeca, R2 = 0.979 and the equation of the regression was HU = −61.098 + 1.178 × gray scale (Figure 3).


Relationship between Hounsfield Unit in CT Scan and Gray Scale in CBCT.

Razi T, Niknami M, Alavi Ghazani F - J Dent Res Dent Clin Dent Prospects (2014)

© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4120902&req=5

Mentions: In Newtom VG, R2 was calculated at 0.997 and the equation of the regression was HU = 14.621 + 1.088 × gray scale (Figure 1). In Scanora Soredex, R2 was estimated at 0.989 and the equation of the regression was HU = −24.052 + 1.146 × gray scale and the relationship was linear (Figure 2). In Planmeca, R2 = 0.979 and the equation of the regression was HU = −61.098 + 1.178 × gray scale (Figure 3).

Bottom Line: In this descriptive study, the head of a sheep was scanned with 3 CBCT and one medical CT scanner.Gray scales and HUs were detected on images.Results.

View Article: PubMed Central - PubMed

Affiliation: Assistant Professor, Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.

ABSTRACT
Background and aims. Cone-beam computed tomography (CBCT) is an imaging system which has many advantages over computed tomography (CT). In CT scan, Hounsfield Unit (HU) is proportional to the degree of x-ray attenuation by the tissue. In CBCT, the degree of x-ray attenuation is shown by gray scale (voxel value). The aim of the present study was to investigate the relationship between gray scale in CBCT) and Hounsfield Unit (HU) in CT scan. Materials and methods. In this descriptive study, the head of a sheep was scanned with 3 CBCT and one medical CT scanner. Gray scales and HUs were detected on images. Reconstructed data were analyzed to investigate relationship between CBCT gray scales and HUs. Results. A strong correlation between gray scales of CBCT and HUs of CT scan was determined. Conclusion. Considering the fact that gray scale in CBCT is the criteria in measurement of bone density before implant treatments, it is recommended because of the lower dose and cost compared to CT scan.

No MeSH data available.