Hounsfield Unit Density Measurements of Revision Mastoidectomy Cases
This data includes Hounsfield Unit Measurements of Temporal Bone CT scans of patients who had revision mastoidectomy operations between April 2013 and March 2019. The aim was to determine if there was any statistically significant difference in terms of Hounsfield Unit Densities between patients who were found to have cholesteatoma and those that were deemed cholesteatoma-free during surgery. Measurements were done separately by a team of otorhinolaryngologists (ORL) and radiologists (Rad) blinded to the patients cholesteatoma status. A Region of Interest (ROI) circle of 5 mm2 was placed at the aditus ad antrum level in axial slices. Additionally same measurement was done in one upper adjacent and one lower adjacent axial slice. Three different measurements were noted separately for two teams: 1) Initial measurements at aditus level (AditusORL and AditusRad), 2) Smallest of three measurements (SmallestORL and SmallestRad) 3) Mean of three measurements (MeanORL and MeanRad). In statistical analysis no statistically significant difference was noted in termes of Hounsifeld Unit Densities in neither ORLs nor Rads measurements between cholestatoma and non-cholesteatoma groups.
Steps to reproduce
Preoperative CT scans of patients undergoing revision mastoidectomy with suspicion of cholestatoma could be evaluated to reproduce our data. CT scans should show complete opacification at aditus ad antrum level. Aditus ad antrum level was found in axial slices using the anatomical reference point for antrum which is lateral semicircular canal. ROI circle should be placed at this level with a area of 5 mm2. In our analysis measurements were done on Infinitt PACS Viewer Software (Infinitt North America, Phillipsburg, NJ).