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Computed gray levels in multislice and cone-beam computed tomography.

Fabiane Azeredo¹, Luciane Macedo de Menezes, Reyes Enciso

¹Department of Orthodontics, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics

|July 2, 2013

Summary

Software programs did not affect computed tomography (CT) and cone-beam CT (CBCT) gray levels. However, gray level discrepancies exist between different CT and CBCT scanners, necessitating caution during image interpretation.

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Area of Science:

Radiology
Medical Imaging
Dental Imaging

Background:

Gray level in computed tomography (CT) reflects x-ray attenuation and tissue density.
Cone-beam CT (CBCT) and multislice spiral CT are key imaging modalities.
Understanding gray level consistency across devices and software is crucial for accurate assessment.

Purpose of the Study:

To investigate the relationship between computed gray levels in CBCT and CT scanners.
To evaluate the influence of different software programs on gray level measurements.
To assess the repeatability and variability of gray level measurements across devices.

Main Methods:

Six materials were scanned using 3 CBCT and 1 CT scanner.
Gray levels were measured using 5 different imaging software programs.
Statistical analyses, including intraclass correlation coefficients and ANOVA, were employed.

Main Results:

No significant differences in mean gray levels were found across the 5 software programs.
Significant differences in gray levels were observed between different scanners for all materials (P < 0.001).

Conclusions:

Software programs demonstrated reliability and did not impact CT and CBCT gray level measurements.
Discrepancies in gray levels exist between different CT and CBCT scanners.
Caution is advised when interpreting CBCT images due to inter-scanner gray level variations.