![]() The improved image of the ROI image in Fig. In order to improve the image quality of an ROI image, a resizing procedure was implemented using an interpolation kernel, particularly a Lanczos-2 kernel. Since the ROI images had a low resolution (about 25×25 pixels), a resolution improvement was required for a suitable examination. ![]() The region of interest (ROI) in the images including the IAC was extracted by a radiologist manually. A sample of the image used in this study is shown in Fig. Obtained image was converted into a 512×512 raw gray level image by removing the Digital Imaging and Communications in Medicine (DICOM) header information. Selected standard images at the level of posterior and superior semi-circular canals confluens (V shape appearance) were used for image analysis. In the control group, all the selection criteria stated above, except having a tinnitus complaint, were applied. Data for the control group were obtained from the radiology department, and informed consent was obtained from the patients. All the cases included in the study were informed about their diseases and the tests to be performed.Ĭases admitted to the radiology clinic for routine cranial MRI and having no pathology in their MRIs were included as the control group. The selection criteria were as follows: having tinnitus complaint for at least for six months, having a normal ENT examination, having no hearing to possibly cause tinnitus (hearing threshold lower than 30 dB in pure sound audiogram, having a normal high frequency audiometry), having no ENT pathology to possibly cause tinnitus (such as Meniere's disease, causes of objective tinnitus, and otosclerosis), and having no systemic disease or a known neuropsychiatric disease. Otorhinolaryngological examinations and routine audiological, biochemical and imaging tests were normal in all of the cases. Seventy-eight cases selected with random sampling method with no gender or sociologic discrimination among patients presenting to the ENT clinic with tinnitus in both ears between February 2010 and July 2011 were included in the study. The aim of the present study was to evaluate the internal acoustic canal and the nerves in it to determine possible structural differences in patients presenting to the outpatient clinic of the ear, nose, and throat (ENT) department with the complaint of subjective tinnitus with no known causes. Up to date, no study has been performed to assess the natural form of the structure of the canal and the contents of it. Ĭomputerized tomography and magnetic resonance imaging (MRI) procedures recommended in evaluating the IAC help identifying pathologies inside the canal rather than the ones in the canal itself. Since the etiological causes of subjective tinnitus are extremely variable, much more studies have to be performed to find actual causes and effective treatment methods. The etiology of tinnitus has not been completely understood despite all the developments in the area of modern medicine. Non-pulsatile tinnitus is nearly always subjective. One of the most frequent causes of non-pulsatile tinnitus is cerebello-pontine junction neoplasms while the most frequent cause is acoustic neurinomas. ![]() ![]() Subjective tinnitus is observed more frequently (internal auditory canal pathology, presbycusis, acoustic trauma, Meniere's disease, otosclerosis, labyrinthitis, effusion, ossicle system deformities, cholesteatoma, tumors, external auditory canal pathology, metabolic, neurologic, and psychological causes). Objective tinnitus usually has a vascular origin (dural arterio-venous malformation, carotid-cavernous fistula, and arteriovenous malformation of the vascular structures of the neck). Tinnitus may be classified as "pulsatile-non-pulsatile" or "objective-subjective." Subjective tinnitus is heard by the patient only, whereas objective tinnitus is the ringing or humming sound heard by both the examining physician and the patient. Ringing or humming of one or both ears without any stimulus is called "tinnitus." Its prevalence is 7%-32% in the general population. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |