Avaliação comparativa dos coeficientes de Hounsfield entre a tomografia computadorizada de feixe cônico e tomografia multislice / Comparative evaluation of the coefficients of Hounsfield between cone computed tomography and multislice CT

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

11/02/2011

RESUMO

The aim of this study was to compare the attenuation coefficients (Hounsfield Unit) in both cone-beam computed tomography (CT) and multislice CT images. The 40-channel CT scanner (SOMATOM Sensation 40 - Siemens) was used to obtain images (n=20) of macerated mandibles considering the following protocol: axial slices of 0.7 mm in thickness and an interval of 0.5 mm between cuts. This same sample was submitted to i-CAT cone-beam CT scanner (Imaging Sciences International): axial slices of 0.2 mm in thickness and a field of view of 8 cm. Images were analyzed by means of computer software - XoranCat (cone-beam CT scan) and the Syngo CT (multislice CT scan) - the latter of which was considered Gold Standard. Coordinates X and Y and the HU tool were used for the measurements. Data were submitted to the descriptive statistical analysis and the paired sample t-test. A mean value of 313.13 HU was obtained for Multislice CT and 418.06 HU for the cone-beam CT (p<0.001). The attenuation coefficient values obtained for the cone-beam CT were overestimated when compared to those for the multislice CT. Since no correspondence was found among the data sampled, cone-beam CT offers no credibility for the dentist to evaluate bone during planning of implant and/or maxillofacial complex surgery

ASSUNTO(S)

tomography x-ray computed boned density tomografia computadorizada por raios x densidade óssea

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