The effect of the cranial bone CT numbers on the brain CT numbers was statistically significant. Bilateral symmetry was particularly good and because of fewer films, radiation exposure was considerably less with orthopantomography. Stapedial imagings of 3-D CT in normal ears showed the same findings as those recorded in temporal bone. To demonstrate the value of multi detector computed tomography MDCT and magnetic resonance imaging MRI in the preoperative work up of temporal bone tumors and to present, especially, CT and MR image fusion for surgical planning and performance in computer assisted navigated neurosurgery of temporal bone tumors. Enlarged vestibular aqueduct was found in 10 ears with sensorineural deafness SD and 2 ears without SD. Our novel pediatric 3D temporal bone training model is a viable, low-cost training option for previously inaccessible pediatric temporal bone training.

Ossicular imagings of the temporal bone in 3-D were reconstructed as if the malleus, incus and stapes were observed under microscope. It can be usefully employed as a template for the production of interactive educational materials, offering JavaScript and providing suitable input for classes. HRCT and MR images of the temporal bone including its normal anatomy, tumors, trauma, inflammation, anomalies and vascular diseases were used in this study. In the ossicular and inner ear lesions, oblique multiplanar images of the long axis of each ossicle was useful the detection of abnormality. Two patients sustained temporal bone fractures after closed head trauma, and developed unilateral otologic symptoms consistent with SCD.

This decreases the likelihood of surgical mishap and improves teaching.


We have been developing a temporal bone dissection simulator based on actual clinical cases for training otolaryngology bome in this delicate procedure. Congenital external auditory canal atresia and stenosis: Figure 1 A, B: The middle ear, and especially the boe, was large and widely pneumatized.


The interrater reliability was 0. A systematic approach to interpretation of computed tomography scans prior to surgery of middle ear cholesteatoma. Conclusion High-resolution CT of the temporal bone provides accurate depiction of lesions explaining the clinical symptoms and helps guide management.

hrct temporal bone thesis

CT and MRI of the temporal bone. In vivo differences do not seem to be as large as suggested in several previous studies. Although some of the abnormalities are visible even in plain films, consistent use of conventional tomography or CT is necessary for correct diagnosis.

Role of High Resolution Computed Tomography in Evaluation of Pathologies of Temporal Bone

Images from a high-resolution CT of a normal temporal bone were converted into stereolithography files via commercially available software, with image conversion tempotal print settings adjusted to achieve optimal print quality. In measuring the brain CT numbers, it is desirable that consideration be given to the cranial bone CT numbers.

hrct temporal bone thesis

In all detectable cases, the canal for the labyrinthine segment of the facial nerve was revealed as one which traversed anterolateralIy, from the anterosuperior portion of the fundus of the internal auditory canal. Therefore, delays may ensue in both diagnosis and treatment of bilateral facial paralysis.

Sigmoid sinus anomaly was detected in patients There were only 2 patients that were accurately diagnosed by HRCT. Nerve canals at the fundus of the internal auditory canal on high-resolution temporal bone CT. In 6 patients who had purely conductive hearing loss, CT revealed various ossicular chain abnormality. The course of the facial nerve was abnormal in four cases, and abnormality of the auditory canal was noted in one.

Eur J Radiol ; We discuss the establishment of a temporal bone laboratory in the Department of Anatomy in the University College Cork, from the timely preparation and preservation of the tissue to remporal disposal.

This probably indicates that the patients come to hospital relatively late and are reluctant for initial treatment [ 10 ]. To explore the high resolution CT image of temporal bone in infants with hearing loss, and its value in evaluating the cause of hearing loss.


Role of High Resolution Computed Tomography in Evaluation of Pathologies of Temporal Bone

CBCT provides comparable image quality to conventional CT for temporal bone anatomical sites in cadaveric specimens. Computed tomography of the temporal bone and orbit.

Is It Obsolete Today? At operation, the lateral limit of the bone removal of the posterior internal auditory canal was determined on the basis of preoperative computed tomography of the temporal bone.

This had transdural intracerebral spread with a large component of solid theiss matrix but no peripheral calcific rim. In a patient with a normal ear, well-developed mastoid cavity, a part of the handle and the head of the malleus, the incudomalleal joint, the short limb, body and a part of the long limb thesiis the incus and the round window niche were demonstrated.

Coronal CT, MRI plain and contrast images of the left temporal bone show soft tissue mass hrcf cochlear promontory with enhancement following contrast – glomus tympanicum Click here to view. Microtia and significant auricular malformation: Sheep temporal bone is a good alternative due to morphological similarities, easy to procure and less cost.

CT scans play an important role in diagnosis and differential diagnosis of occipital bone pacchionian depression. Similar results were found by Alzoubi et al.

hrct temporal bone thesis

Three otologists graded the use of routine preoperative planning provided by MED-EL and that of operating on the 3D printed bone of the patient.