Jun 09, 20 imaging of petrous bone part 1 anatomy dr mamdouh mahfouz. Interactive webbased learning module on ct of the temporal. Imaging of petrous bone part 1 anatomy dr mamdouh mahfouz. Separates the descending portion from the horizontal tympanic segment. Aug 30, 2017 how to read a temporal bone ct temporal bone made ridiculously simple a systematic axial approach thank each one of you for making it happen. The lower seven cranial nerves and the major vessels to and from the brain traverse the temporal bone. To identify pathologically important anatomical landmarks of the temporal bone on ct to provide an overview of the common pathologies affecting the temporal bone background many general radiologists and trainees fear the anatomy and pathology of the temporal bone due to its complex configuration, complicated nomenclature and minute. On a lateral view of the temporal bone, such as figure 1. Tympanic part of temporal bone radiology reference article. The ct of the sinuses focuses in on the sinuses though the radiation goes through the entire skull and generally covers the entire set of sinuses sphenoid, maxillary, frontal, ethmoid. Axial ct images show the normal anatomy of the temporal bone from inferior a to superior g. Bacon 1 involvement of the ossicular chain by temporal bone dis. Temporal bone or skull base erosion were best seen on ct at bone algorithm. Ct and mr imaging are essential crosssectional imaging modalities for assessment of temporal bone anatomy and pathology.
The temporal bones are situated at the sides and base of the skull, and lateral to the temporal lobes of the cerebral cortex. For scans done on children or patients requiring restraint device immobilization, it is optimal to view a coronal mpr image to rule out motion before discharging patient. Ct temporal bone with iv contrast img 14158 acquisition a reconstruction reformation other note. Planes of scanning axial 30 degrees to anthropological base line parallel to lateral scc. Its lower portion connects with the mandible or jawbone to allow the mouth to open and close. An interactive webbased learning module on the temporal bone has been developed. An understanding of temporal bone anatomy is crucial in evaluating patients with trauma for temporal bone. Temporal bone anatomy and imaging features of common. Radiation dose in temporal bone ct imaging can be high due to the requirement of high spatial resolution. Ct imaging anatomy and pathology in multiple imaging planes is very well depicted. The temporal bones are paired bones that help make up the sides and base of the skull cranium. Computed tomographic anatomy of the temporal bone american. Hrct temporal bone anatomy slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Introduction temporal bone is a composite structure consisting of tympanic bone, mastoid process, squama and petrosa. If you continue browsing the site, you agree to the use of cookies on this website. Temporal bone fractures are subdivided into petrous apex and nonpetrous apex fractures. Computed tomography imaging technique and normal computed. Multidetector row ct images, including reformations, better delineate temporal bone anatomy than do singledetector row ct images. The tympanic part of the temporal bone is situated inferiorly to the squamous part and anteriorly to the mastoid part the tympanic part surrounds the external auditory meatus, forming the anterior wall, floor and some of the posterior wall of the bony external acoustic meatus. Ultrahighresolution ct scan of the temporal bone springerlink. Axial sequential ct images of normal temporal bone normal structures.
The middle ear and the bony labyrinth are breached. As temporal bone computed tomography ct has become more sophisticated, more abnormalities of the middle and inner ear have been found. The aim of this presentation is to demonstrate imaging findings of common diseases of the temporal bone. The temporal bones were scanned in the direct axial and coronal planes using high resolution thin slices without contrast. The anatomy of temporal bone is more conspicuous on uhrct than on convct because of its ultrahighresolution detector. Imaging of temporal bone trauma geisel school of medicine.
Pdf basic and advanced temporal bone anatomy using different. Mr with and without infusion provided excellent delineation of softtissue tumor margins, muscle infiltration. With the recent development of highresolution computed tomography ct, there is a growing need to explore the full potential of this new method in demonstrating the detailed anatomy of the temporal bone. The temporal bone is situated on the sides and the base of the cranium and lateral to the temporal lobe of the cerebrum. Styloid process eventhough is closely associated with temporal bone, is not considered as a part of it. Imaging of the temporal bone has recently been advanced with multidetector ct and highfield mr imaging to the point where radiologists and clinicians must familiarize themselves with anatomy that was previously not resolvable on older generation scanners. Ct is the imaging modality of choice for most of the pathologic conditions of the temporal bone, especially for those of the middle ear.
Cross sectional imaging of the ear and temporal bone ncbi. Ct evaluation of the temporal bone ossicles by using oblique reformations. This places them lateralto the side ofthe temporal lobes of the brains cerebral cortex, ensuring that the cranium is properly supported and protecting the important structures there. In addition, this bone surrounds the middle and inner portions of the ear.
Radiologic and audiologic findings in the temporal bone of. Iac internal auditory canal, ica internal carotid artery, lscc. It shows normal temporal bone anatomy in four imaging planes. How to read a temporal bone ct temporal bone made ridiculously simple a systematic axial approach thank each one of you for making it happen. Aug 22, 2018 according to both observers, stapedius tendon was more clearly visualized using uhrct than convct p ct scanners. Some structures are discussed in more detail with emphasis on related pathology. The lower portion of the bone articulates with the mandible, forming the temporomandibular joint of the jaw. This atlas allows you to scroll through ct slices of the temporal bone in four different planes. The temporal bone provides structural support for the skull, while protecting the cerebrum of the brain and surrounding membranes. Pdf basic and advanced temporal bone anatomy using. Click download or read online button to get temporal bone book now.
The first is the mastoid process, an inferior projection of bone, palpable just behind the ear. This portion of the temporal bone is located posteriorly. Any information contained in this pdf file is automatically generated from digital. Petrous apex fractures tend to involve the iac and cochlea, explaining the higher prevalence of cn vii and viii dysfunction than with nonpetrous apex fractures fig. Ct evaluation of the temporal bone ossicles by using oblique. It contains the middle and inner portions of the ear, and is crossed by the majority of the cranial nerves. Because of its superior contrast resolution, ct was able to demonstrate numerous structures, such as the tympanic membrane, ossicles, and supporting structures, hitherto never or poorly visualized by any other method. The temporal bones are overlaid by the sides of the head known as the temples, and house the structures of the ears. Anatomy of the petrous bone ct atlas of human anatomy using crosssectional imaging we have created an atlas of the temporal bone which is an educational tool for studying the normal anatomy of the petrous bone based on an mdct exam of the axial and coronal of the ear and petrous bone.
Combined surgical approaches temporal craniotomy and mastoidectomy by neurosurgical and otological teams are recommended for meningiomas originating in the temporal bone. The orbital ct will cover the eye sockets and those. Diagnosis and surgical intervention in this area require sufficient clinical information and a thorough knowledge of the anatomy of the temporal bone 1 2 3. Pdf to master the detailed ct anatomy of the middle and inner ear to make use of several recognizable figures as landmarks for positioning. A must read for all who interpret temporal bone imaging studies. The temporal bone contributes to the lower lateral walls of the skull. Sections parallel to the hard palate direct coronal plane patient head extended in prone or supine with 105 degree plane is perpendicular to the lateral scc sections are parallel to posterior wall of maxillary sinus. Anatomy and inflammatory and neoplastic processes1 from a clinicalradiologic standpoint, there are a limited number of structures and disease entities in the temporal bone with which one must be familiar in order to proficiently interpret a computed tomographic or. A fracture line arrow traverses the temporal bone obliquely, with features of both transverse and longitudinal type fractures. For this purpose, dry skulls with intact ossicles were scanned in axial and coronal projections. Temporal bone download ebook pdf, epub, tuebl, mobi. Apr 15, 2020 the temporal bone articulates with a number of other flat bones of the skull at joints called sutures.
Computed tomography temporal bone anatomy technique. Understanding the anatomy of the temporal bone has always been, is and will be a difficult task for doctors of various specialities. Computed tomography ct of the temporal bone is an important diagnostic imaging tool. The detailed ct anatomy of the temporal bone was documented, complemented by images from live patients. It is helpful to examine the region in an organized and sys tematic fashion, going through the same checklist of key structures each time. Basic and advanced temporal bone anatomy using different figures as landmarks. Lesions that arise within or involve the iac can be considered together with lesions affecting the cpa cistern. This gallery of images presents the anatomy of the temporal bone by means of ctscan reconstructions. Full text get a printable copy pdf file of the complete article 4.
Ct imaging of temporal bone can be done by mdct or cone beam ct. The temporal bone is one of the most important calvarial and skull base bones. On the right, the external auditory canal, mastoid complexes, and middle ear, including the ossicles and pneumatization are normal. Axial thinsection ct image of the temporal bone in a motor vehicle accident victim and complex hearing loss. Normal ct anatomy normal anatomic structures of the temporal bone as seen on axial and coronal thinsection ct are demonstrated in figs. In this study, we assessed whether ct imaging of the temporal bone by using an ultrahighresolution scan mode combined with iterative reconstruction provides higher spatial resolution and lower image noise than a zaxis ultrahighresolution mode.
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