IADR Abstract Archives

Influence of Tongue/Mandible Volume Ratio to Airway in OSA Patients

Study objectives: To investigate the influence on the upper airway of the size ratio of tongue and mandible (T/M ratio) with 3D reconstructed models from Computed Tomography (CT) data. Subjects and Methods: The subjects were 40 OSA male patients. The age of the patients ranged from 25 to 77 years, with an average age of 52.6±12.5 years. The Body Mass Index (BMI) of the patients ranged from 20.1 to 35.8 kg/m2, with an average BMI of 25.4±3.4 kg/m2. All patients underwent a full-night polysomnography. The mean AHI for our subjects was 23.6 ± 18.3 events per hour. CT imaging examinations were carried out in each patient. The mandible and airway within this slab were segmented based on Hounsfield units, automatically or semi-automatically, and their volume was calculated from the number of voxels. The tongue was carefully outlined, and the inside of the tongue was smeared on each of the axial, frontal and sagittal planes with a semi-automatic segmentation tool. The T/M ratio was calculated from the volume of the mandible and the tongue. In addition, we investigated simple correlations between our anatomical variables and BMI, age, and AHI with Spearman's test. Results: In this study, the mean tongue and mandible volume were 78990±10607.8 mm3 and87806±12079.6 mm3, respectively. There was a significant negative correlation between BMI and airway volume (p=.014). There was a significant positive correlation between BMI and tongue volume, T/M ratio (p=.002, p=.023). There were no significant correlations between AHI and other variables. Airway volume did not significantly correlate with mandible volume or tongue volume. On the other hand, there was a negative correlation between airway volume and T/M ratio (p=.046). Conclusion: We estimate that the alteration of T/M ratio due to increased BMI is likely to be involved in the development of OSA.
IADR/PER General Session
2010 IADR/PER General Session (Barcelona, Spain)
Barcelona, Spain
2010
27
Diagnostic Sciences
  • Shigeta, Yuko  ( Tsurumi University, Yokohama, N/A, Japan )
  • Ogawa, Takumi  ( Tsurumi University, Yokohama, N/A, Japan )
  • Ando, Eriko  ( Tsurumi University, Yokohama, N/A, Japan )
  • Enciso, Reyes  ( University of Southern California, Los Angeles, CA, USA )
  • Clark, Glenn T.  ( University of Southern California, Los Angeles, CA, USA )
  • Oral Session
    Computed Tomography and Magnetic Resonance Imaging
    07/14/2010