Jahanbakhsh, Javid
(2016)
Inner ear morphometry on high resolution computed
tomography in patients with sensorineural hearing loss.
Masters thesis, Universiti Sains Malaysia.
Abstract
Materials and methods: A retrospective study was conducted from May 2012 till August
2015 in the Department of Radiology, Hospital Universiti Sains Malaysia. Patients with
sensorineural hearing loss who was referred for computed tomography of the temporal bone
were selected in the study group. All scans were performed on Siemens 128-slices CT
scanner Somatom Definition 128-slice with high-resolution scanning protocol. All the images
were reconstructed to bone window. Patient who had computed computed tomography of the
temporal bone for other indications with normal contralateral ear were taken as a control
group. Three inner ear structures (vestibular width, cochlear basal turn and lateral
semicircular canal bony island width) were measured on axial image on diagnostic
workstation). The measurements were repeated three times and average of these
measurements were taken. Measurements were randomly selected and validated by an
experienced radiologist to minimize bias.
Results: Fifty ears from 28 patients with SNHL (22 patients with bilateral disease and 6
patients with unilateral) were included in this study. Gross abnormality of inner ear detected
on HRCT in 5 ears (3 patients) of SNHL were excluded. A total of 45 ears were selected in
both study and control groups. Twenty-five ears from patients with SNHL were male patient
and 20 ears were female, same as control group. Age range for patients with SNHL was 2 to
23 years old with mean of 9.98 years old. The age range for control group was 2 to 76 years
old with mean of 29.55 years. The mean (standard deviation) width of cochlear was 0.190 cm
(0.017 cm), vestibular was 0.330 cm (0.039 cm) and lateral semicircular bone island width
was 0.362cm (0.566 cm) of patients with SNHL. There were no significantly different of
mean of these measurements with control group (P value > 0.05).
Conclusions: The morphometry of cochlear, vestibular and lateral semicircular bone island
width are not reliably differentiating between SNHL and non SNHL patients.
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