Volume of Mastoid Pneumatization: Three-Dimensional Reconstruction with Ultrahigh-Resolution Computed Tomography

Luntz, Michał; Malatskey, Shelton; Barmeir, Elisha; Tan, Mark; Ruimi, David

doi:10.1177/000348940111000516

Cited by 35 publications

(29 citation statements)

References 7 publications

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“…The developed equations show that this is true only true for ears derived from a population where the tympanum/MACS ratio of effective blood perfusion (related to surface area) per unit volume, M, is less than 1. Geometrical considerations show that the surface area per unit volume ratio of the MACS is much greater than that for the tympanum, and consequently, if M<1, blood perfusion per unit surface area must be much less for the MACS when compared to the tympanum [1,14,[37][38][39].…”

Section: Discussionmentioning

confidence: 99%

The mastoid as a functional rate-limiter of middle ear pressure change

Doyle

2007

International Journal of Pediatric Otorhinolaryngology

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Section: Discussionmentioning

confidence: 99%

The mastoid as a functional rate-limiter of middle ear pressure change

Doyle

2007

International Journal of Pediatric Otorhinolaryngology

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“…The mastoid pneumatization and its measurement has also been studied earlier [3,4]. In a multiracial country like Malaysia it is an advantage to do racial comparison studies with regards to the pneumatization of these structures as these should apply to the most common Asian races in general.…”

Section: Introductionmentioning

confidence: 99%

Pneumatization of Mastoid Air Cells, Temporal Bone, Ethmoid and Sphenoid Sinuses. Any Correlation?

Hindi

Alazzawi

Raman

et al. 2014

Indian J Otolaryngol Head Neck Surg

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The aim of this study is to assess the pneumatization of the paranasal sinuses (PNS) and other parts of temporal bone such as mastoid air cells and to investigate if there was any association between the aeration of these structures among the three major ethnic groups in Malaysia (Malay, Chinese, Indian) as this would be representative of Asia. A retrospective review of 150 computed tomography (CT) scans of PNS and temporal bones was done and analysed. The pneumatization of each area was obtained and compared using statistical analysis. Patients with a history of previous medical or surgical problems in the intended areas were excluded from the study. The pneumatization of the mastoid air cells and other temporal bone parts were noted to be symmetrical in more than 75 %. There was a positive correlation between the pneumatization of mastoid air cells and that of the sphenoid sinus. The prevalence of Agger nasi, Haller's and Onodi cells was observed to be significantly higher in the Chinese group. Preoperative assessment of the temporal bone and PNS with CT scan may be helpful in the evaluation of their anatomical landmark and decrease the possibility of surgical complications related to 3D structures.

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“…An alternative is to scan the mastoid bone through X-ray computed tomography (CT), and consider the walls of the mastoid air cell system as a surrogate to the very thin mucosa invisible on clinical CT scans. The volume of gas occupied within the mastoid air cells, also important to estimate when investigating how well a mastoid is pneumatized, is though easier to estimate using X-ray CT and has been reported in several studies [84,17,37,48,54,64,77,88].…”

Section: Forewordmentioning

confidence: 99%

Structural properties of the mastoid using image analysis and visualization

Cros¹

2017

Linköping Studies in Science and Technology. Dissertations

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Volume rendering of a 3D shape analysis where medial balls are fitting the mastoid air cell system of a human temporal bone specimen, overlaid over a manually cropped version of the original data. The different colours represent the different size classes: from very small in dark blue to vary large in purple. The bone is rendered with a modified transfer function so as to reveal the micro-channels.Copyright © 2017 Olivier Cros, unless otherwise noted. AbstractThe mastoid, located in the temporal bone, houses an air cell system whose cells have a variation in size that can go far below current conventional clinical CT scanner resolution. Therefore, the mastoid air cell system is only partially represented in a clinical CT scan. Where the conventional clinical CT scanner lacks level of minute details, micro-CT scanning provides an overwhelming amount of fine details. The temporal bone being one of the most complex in the human body, visualization of micro-CT scanning of this bone awakens the curiosity of the experimenter, especially with the correct visualization settings.This thesis first presents a statistical analysis determining the surface area to volume ratio of the mastoid air cell system of human temporal bone, from micro-CT scanning using methods previously applied for conventional clinical CT scans. The study compared current results with previous studies, with successive downsampling the data down to a resolution found in conventional clinical CT scans. The results from the statistical analysis showed that all the small mastoid air cells, that cannot be detected in conventional clinical CT scans, do heavily contribute to the estimation of the surface area, and in consequence to the estimation of the surface area to volume ratio by a factor of about 2.6. Such a result further strengthens the idea of the mastoid to play an active role in pressure regulation and gas exchange.Discovery of micro-channels through specific use of a non-traditional transfer function was then reported, where a qualitative and a quantitative preanalysis were performed and reported. To gain more knowledge about these micro-channels, a local structure tensor analysis was applied where structures are described in terms of planar, tubular, or isotropic structures. The results from this structural tensor analysis suggest these micro-channels to potentially be part of a more complex framework, which hypothetically would provide a separate blood supply for the mucosa lining the mastoid air cell system.The knowledge gained from analysing the micro-channels as locally providing blood to the mucosa, led to the consideration of how inflammation of the mucosa could impact the pneumatization of the mastoid air cell system. Though very primitive, a 3D shape analysis of the mastoid air cell system was carried out. The mastoid air cell system was first represented in a compact form through a medial axis, from which medial balls could be used. The medial balls, representative of how large the mastoid air cells can be locally, were used in two co...

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Volume of Mastoid Pneumatization: Three-Dimensional Reconstruction with Ultrahigh-Resolution Computed Tomography

Cited by 35 publications

References 7 publications

The mastoid as a functional rate-limiter of middle ear pressure change

The mastoid as a functional rate-limiter of middle ear pressure change

Pneumatization of Mastoid Air Cells, Temporal Bone, Ethmoid and Sphenoid Sinuses. Any Correlation?

Structural properties of the mastoid using image analysis and visualization

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