How to reliably evaluate middle ear diseases? Comparison of different methods of post-processing based on multislice computed tomography examination.
CONCLUSIONS
Multislice computed tomography (MSCT) virtual endoscopy was useful in evaluating mainly post-traumatic and postoperative cases. In other pathological conditions axial images and MPR reformations were most useful.


OBJECTIVE
Evaluation of cross-sectional images, multiplanar 2-D reformations, 3-D reconstructions and virtual endoscopy (VE) in assessment of the middle ear in inflammatory diseases, trauma, otosclerosis and tumours. Comparison of each method and correlation with surgical findings.


METHODS
Investigations were carried out in 80 patients with middle ear pathology. In each case MSCT of the petrous bone was performed. In addition to cross-sectional native scans, frontal and sagittal images were achieved using MPR reconstructions. 3-D volume rendering (VR) and VE images were also generated. The value of native scans information, 2-D, 3-D reconstructions and VE of the tympanic cavity structures was assessed in comparison to intraoperative findings.


RESULTS
MPR reconstructions were most useful in the assessment of skull base trauma, skull base tumours and in cases of chronic middle ear inflammation. Highly vascularized tumours, disruption of ossicular chain and stapes prosthesis were best evaluated on 3-D reconstructions. Axial images proved to be the best for otosclerosis interpretation.
Trojanowska
A
A
Department of Radiology, University Medical School of Lublin, Lublin, Poland. agnieszka30@yahoo.com
Trojanowski
P
P
Olszanski
W
W
Klatka
J
J
Drop
A
A
D000328:Adult; D000368:Aged; D004427:Ear Diseases / Q000000981:diagnostic imaging*; D004428:Ear Neoplasms / Q000000981:diagnostic imaging; D004432:Ear, Middle / Q000000981:diagnostic imaging* / Q000293:injuries; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D010033:Otitis Media / Q000000981:diagnostic imaging; D010040:Otosclerosis / Q000000981:diagnostic imaging; D038781:Otoscopy; D010579:Petrous Bone / Q000000981:diagnostic imaging; D012680:Sensitivity and Specificity; D019291:Skull Base / Q000000981:diagnostic imaging / Q000293:injuries; D019292:Skull Base Neoplasms / Q000000981:diagnostic imaging; D012887:Skull Fractures / Q000000981:diagnostic imaging; D036542:Tomography, Spiral Computed; D014584:User-Computer Interface