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Correlation between pixel values in a cone-beam computed tomographic scanner and the computed tomographic values in a
Jira Chindasombatjaroen1, Naoya Kakimoto, Hiroaki Shimamoto
1Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, Osaka, Japan.
Cone-beam computed tomography (CBCT) pixel values strongly correlate with multidetector row CT values. Linear functions can convert CBCT pixel values to CT values, enhancing imaging consistency.
Area of Science:
- Radiology
- Medical Imaging
- Quantitative Imaging
Background:
- Cone-beam computed tomography (CBCT) and multidetector row CT (MDCT) are advanced imaging modalities.
- Standardizing quantitative data between CBCT and MDCT is crucial for accurate analysis.
Purpose of the Study:
- To investigate the correlation between CBCT pixel values and MDCT computed tomographic (CT) values.
- To determine the linearity of this relationship across varying imaging parameters.
Main Methods:
- A phantom with varying contrast concentrations was scanned using both CBCT and MDCT scanners.
- ImageJ software was used to measure pixel values and CT values.
- Pearson correlation coefficient and regression analysis were employed.
Main Results:
- A statistically significant correlation (P < 0.0001) was observed between CBCT pixel values and MDCT CT values.
- A linear relationship was identified between the values obtained from both scanners at all tested parameters.
Conclusions:
- CBCT pixel values and MDCT CT values exhibit a high correlation and linear relationship.
- Linear conversion functions can be reliably applied to transform CBCT pixel values to CT values, facilitating cross-modality comparisons.
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