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Il Giornale Italiano di Radiologia Medica 2018 Novembre-Dicembre;5(6):734-7

DOI: 10.23736/S2283-8376.18.00141-9


language: Italian

Application of 3D segmentation methods on CT images to the morphological and metric analysis of the frontal sinuses for surgical purposes

Michaela CELLINA 1 , Daniele GIBELLI 2, Cristina ROSTI 1, Federica LEONE 1, Elena BELLONI 3, Fabrizio CALLIADA 4, Chiarella SFORZA 2, Giancarlo OLIVA 1

1 Reparto di Radiologia, Ospedale Fatebenefratelli, ASST Fatebenefratelli Sacco, Milano, Italia; 2 Dipartimento di Scienze Biomediche per la Salute, Università degli Studi di Milano, Milano, Italia; 3 Reparto di Radiologia, Ospedale Civile, Vigevano, Pavia, Italia; 4 Reparto di Radiologia, Fondazione IRCCS Policlinico San Matteo, Pavia, Italia


BACKGROUND: The variability of shapes and sizes constitutes a fundamental property of the frontal sinuses and has an enormous importance in different surgical fields, especially in endoscopy. The diffusion of the methods of segmentation from CT images can provide a fundamental approach for the detailed study of the morphology of these structures through their three-dimensional visualization. The aim of this study is to evaluate the shape and volume of the frontal sinuses by analyzing the respective three-dimensional models segmented by CT examinations.
METHODS: Twenty subjects (10 males and 10 females) undergoing CT scan of the head were selected from a hospital database. The right and left frontal sinuses belonging to the same patient were segmented by ITK-SNAP program and the obtained models were automatically overlapped on those of the other subjects based on the smaller point-on-point distance between the two surfaces, for a total of 110 overlays (equally divided between males and females). The volume of the right and left frontal sinus of each subject was calculated. The root mean square (RMS) values of the point-to-point distances and the calculated volumes were compared by two-way ANOVA tests to evaluate the possible influence of sex and side (P<0,05).
RESULTS: In male subjects, the mean RMS value was 2,64±1,19 mm on the right, 2,52±1,43 mm on the left, females 2,25±1,27 mm on the right, 2,55±1,54 mm on the left. The mean volume of the right and left frontal sinus was equal to 3,016±2,101 cm3 and 3,963±1,952 cm3, respectively, while in women the same values were equal to 2,954±1,108 cm3 and 3,622±2,266 cm3. Neither the RMS values nor the volumes showed statistically significant differences with respect to sex or side (P>0,05).
CONCLUSIONS: This study describes a means of morphological and quantitative assessment of the frontal sinuses in the surgical field.

KEY WORDS: Frontal sinus - Endoscopy - X-ray computed tomography

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