scholarly journals Are Hounsfield Unit Measurements of Bony Absorption Changes in Cholesteatoma Helpful?

2021 ◽  
Author(s):  
Shay Shemesh ◽  
Judith Luckman ◽  
Tal Marom ◽  
Oded Kraus ◽  
Sharon Ovnat Tamir
Keyword(s):  
Computed Tomography ◽  
Retrospective Study ◽  
Middle Ear ◽  
Early Stage ◽  
Hounsfield Unit ◽  
Lateral Semicircular Canal ◽  
High Resolution Computed Tomography ◽  
Fallopian Canal ◽  
Ear Ossicles ◽  
Bony Erosion

Abstract Introduction High-resolution computed tomography (HRCT) scans of the temporal bone are used to assess the bony erosion of the middle-ear structures whenever cholesteatoma is suspected. Objective To study the differences in HRCT Hounsfield unit (HU) index measurements of middle-ear bony structures between an ears with and without cholesteatoma. Methods A retrospective study of 59 patients who underwent surgery due to unilateral cholesteatoma. The HRCT HU index of the scutum, of three middle-ear ossicles, of the lateral semicircular canal (LSCC), and of the fallopian canal was measured in both ears. A comparison was made between the cholesteatoma and the non-cholesteatomatous ear (control). All measurements were conducted by an otolaryngologist. To assess the interobserver bias, 10% of the samples were randomly and independently assessed by another otolaryngologist and a neuroradiologist who were blinded. Results The average HU index was lower in the ear with cholesteatoma when compared with the non-cholesteatomatous ear. While the differences were statistically significant regarding the measurements of the scutum (516.02 ± 311.693 versus 855.64 ± 389.999; p = 0.001), the malleus (1049.44 ± 481.765 versus 1413.47 ± 313.376; p = 0.01), and the incus (498.03 ± 264.184 versus 714.25 ± 405.631; p = 0.001), the differences in the measurements of the LSCC (1042.34 ± 301.066 versus 1154.53 ± 359.609; p = 0.69) and of the fallopian canal (467.19 ± 221.556 versus 543.51 ± 263.573; p = 0.108) were not significantly different between both groups. The stapes was immeasurable in both groups due to its small size. Conclusion Hounsfield unit index measurements are a useful tool that may aid in the diagnosis of early-stage cholesteatoma.

scholarly journals Radio-surgical correlation of chronic suppurative otitis media

2019 ◽  
Vol 6 (1) ◽  
pp. 118
Author(s):  
Yogeesha B. S. ◽  
Nagaraj Maradi ◽  
Ravi Shekhar ◽  
Rohini D. Urs
Keyword(s):  
Otitis Media ◽  
Middle Ear ◽  
Predictive Value ◽  
Ossicular Chain ◽  
Chronic Suppurative Otitis Media ◽  
High Resolution Computed Tomography ◽  
Suppurative Otitis Media ◽  
Fallopian Canal ◽  
Ear Ossicles ◽  
Kappa Value

<p class="abstract"><strong>Background:</strong> Chronic suppurative otitis media (CSOM) because of disease nature and location of vital structures like middle ear ossicles, facial nerve, and lateral semicircular canal poses clinical as well as radiological challenge in diagnosis, especially the squamosal variety. Hence this study to evaluate radio-surgical correlation in cases of CSOM.</p><p class="abstract"><strong>Methods:</strong> We retrospectively analysed 92 case records who met the inclusion criteria. Their pre-operative high-resolution computed tomography (HRCT) temporal bone imaging was evaluated for erosion of the ossicular chain and the fallopian canal. This was correlated with the surgical findings noted intra-operatively. The appropriate statistical analysis was carried out. The radio-surgical correlation was evaluated by Cohen’s kappa value.  </p><p class="abstract"><strong>Results:</strong> The kappa value for status of ossicular chain was 0.805 and 0.384 for status of fallopian canal. HRCT imaging had a positive predictive value and negative predictive value of 94.3% and 85.3% respectively, in detecting ossicular chain erosion. In detecting fallopian canal erosion, HRCT showed a sensitivity of 33.3%. Analysing the individual ossicles, we found kappa to be 0.266 for malleus, 0.463 for incus and 0.827 for stapes.</p><p class="abstract"><strong>Conclusions:</strong> There was excellent radio-surgical correlation for ossicular chain erosion while it was poor for fallopian canal erosion. HRCT showed excellent radio-surgical correlation for stapes, moderate for incus and poor for malleus. In-spite of its shortcomings in differentiating cholesteatoma and non-cholesteatomatous pathologies of the middle ear cleft, HRCT imaging plays a key role in assessing the status of the ossicles and fallopian canal.</p><p> </p>

Biometry of the normal stapes using stapes axial plane, high-resolution computed tomography

2014 ◽  
Vol 128 (5) ◽  
pp. 425-430 ◽  
Author(s):  
J Rousset ◽  
M Garetier ◽  
J-C Gentric ◽  
S Chinellato ◽  
C Barberot ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Retrospective Study ◽  
Semicircular Canal ◽  
Axial Plane ◽  
Lateral Semicircular Canal ◽  
High Resolution Computed Tomography ◽  
Computed Tomography Scans ◽  
Joint Width ◽  
Plane Versus ◽  
Incudostapedial Joint

AbstractObjective:The stapes is difficult to analyse on computed tomography because of the small size of its components and its oblique orientation. The stapes axial plane, parallel to the superstructure, seems optimal for this purpose. The present study assessed the position of the stapes axial plane with respect to the usual axial plane including the lateral semicircular canal, and sought to measure the main dimensions of the stapes.Methods:This retrospective study comprised 208 computed tomography scans of normal ears. Stapes length and width, footplate thickness and incudostapedial joint width were measured.Results:The stapes axial plane was directed upward, outward (44°) and forward (12°) with respect to the lateral semicircular canal plane. Mean head-to-footplate distance was 3.7 mm and mean superstructure width was 2.7 mm. Mean footplate thickness was 0.27 mm on stapes axial plane versus 0.48 mm on lateral semicircular canal plane. Incudostapedial joint width was systematically less than 0.7 mm.Conclusion:Stapes dimensions on stapes axial plane were close to anatomical data, particularly for footplate thickness.

scholarly journals Radiomics of high-resolution computed tomography for the differentiation between cholesteatoma and middle ear inflammation: effects of post-reconstruction methods in a dual-center study

2020 ◽  
Author(s):  
Christophe T. Arendt ◽  
Doris Leithner ◽  
Marius E. Mayerhoefer ◽  
Peter Gibbs ◽  
Christian Czerny ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Middle Ear ◽  
Characteristic Curve ◽  
High Resolution Computed Tomography ◽  
Probability Of Error ◽  
Haar Wavelet Transform ◽  
Reconstruction Methods ◽  
The Impact ◽  
Center Study

Abstract Objectives To evaluate the performance of radiomic features extracted from high-resolution computed tomography (HRCT) for the differentiation between cholesteatoma and middle ear inflammation (MEI), and to investigate the impact of post-reconstruction harmonization and data resampling. Methods One hundred patients were included in this retrospective dual-center study: 48 with histology-proven cholesteatoma (center A: 23; center B: 25) and 52 with MEI (A: 27; B: 25). Radiomic features (co-occurrence and run-length matrix, absolute gradient, autoregressive model, Haar wavelet transform) were extracted from manually defined 2D-ROIs. The ten best features for lesion differentiation were selected using probability of error and average correlation coefficients. A multi-layer perceptron feed-forward artificial neural network (MLP-ANN) was used for radiomics-based classification, with histopathology serving as the reference standard (70% of cases for training, 30% for validation). The analysis was performed five times each on (a) unmodified data and on data that were (b) resampled to the same matrix size, and (c) corrected for acquisition protocol differences using ComBat harmonization. Results Using unmodified data, the MLP-ANN classification yielded an overall median area under the receiver operating characteristic curve (AUC) of 0.78 (0.72–0.84). Using original data from center A and resampled data from center B, an overall median AUC of 0.88 (0.82–0.99) was yielded, while using ComBat harmonized data, an overall median AUC of 0.89 (0.79–0.92) was revealed. Conclusion Radiomic features extracted from HRCT differentiate between cholesteatoma and MEI. When using multi-centric data obtained with differences in CT acquisition parameters, data resampling and ComBat post-reconstruction harmonization clearly improve radiomics-based lesion classification. Key Points • Unenhanced high-resolution CT coupled with radiomics analysis may be useful for the differentiation between cholesteatoma and middle ear inflammation. • Pooling of data extracted from inhomogeneous CT datasets does not appear meaningful without further post-processing. • When using multi-centric CT data obtained with differences in acquisition parameters, post-reconstruction harmonization and data resampling clearly improve radiomics-based soft-tissue differentiation.

The incidence of tympanogenic labyrinthitis ossificans

2014 ◽  
Vol 128 (7) ◽  
pp. 618-620 ◽  
Author(s):  
H-Y Lin ◽  
Y-K Fan ◽  
K-C Wu ◽  
M-T Shu ◽  
C-C Yang ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Head And Neck Cancer ◽  
Cochlear Implants ◽  
Semicircular Canal ◽  
Lateral Semicircular Canal ◽  
Posterior Semicircular Canal ◽  
High Resolution Computed Tomography ◽  
Labyrinthitis Ossificans ◽  
Computed Tomography Scans ◽  
History Of

AbstractObjective:To estimate the incidence of tympanogenic labyrinthitis ossificans.Methods:The records of patients treated with mastoidectomy for various tympanogenic aetiologies from January 2007 to December 2011 were retrospectively reviewed. Patients whose high-resolution computed tomography scans showed evidence of labyrinthine calcification of the temporal bone were enrolled. Patients with a history of head and neck cancer, meningitis, and otosclerosis, and patients with cochlear implants, were excluded from this study.Results:A total of 195 patients were enrolled in this study; 4 of the patients presented with calcification in the inner ear. Therefore, the incidence of tympanogenic labyrinthitis ossification was 2 per cent. The computed tomography findings revealed: (1) cochlear calcifications of the basal and middle turn in two patients; and (2) vestibular, superior semicircular canal, posterior semicircular canal and lateral semicircular canal calcification in one, four, three and two patients, respectively.Conclusion:The incidence of tympanogenic labyrinthitis ossification in patients who had undergone a mastoidectomy was 2 per cent.

Visualization of the middle ear with high resolution computed tomography and superfine fiberoptic videomicroendoscopy

1998 ◽  
Vol 255 (6) ◽  
pp. 277-280 ◽  
Author(s):  
T. S. Karhuketo ◽  
P. S. Dastidar ◽  
E. M. Laasonen ◽  
M. M. Sipilä ◽  
H. J. Puhakka
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Middle Ear ◽  
High Resolution Computed Tomography

3D image of the middle ear ossicles: three protocols of post-processing based on multislice computed tomography

2010 ◽  
Vol 268 (5) ◽  
pp. 677-683 ◽  
Author(s):  
Li-chun Zhang ◽  
Yan Sha ◽  
Zheng-min Wang ◽  
Dao-tian Luo ◽  
Wen-hu Huang ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Middle Ear ◽  
Multislice Computed Tomography ◽  
3D Image ◽  
Post Processing ◽  
Ear Ossicles

The Role of High Resolution Computed Tomography in Evaluating Disease of the Middle Ear

1982 ◽  
Vol 6 (4) ◽  
pp. 711-720 ◽  
Author(s):  
Chat Virapongse ◽  
Stephen L. G. Rothman ◽  
Clarence Sasaki ◽  
E. Leon Kier
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Middle Ear ◽  
High Resolution Computed Tomography

scholarly journals COMPUTER AIDED THREE-DIMENSIONAL RECONSTRUCTION AND MODELING OF MIDDLE EAR BIOMECHANICS BY HIGH-RESOLUTION COMPUTED TOMOGRAPHY AND FINITE ELEMENT ANALYSIS

2006 ◽  
Vol 18 (05) ◽  
pp. 214-221 ◽  
Author(s):  
CHIA-FONE LEE ◽  
PEIR-RONG CHEN ◽  
WEN-JENG LEE ◽  
JYH-HORNG CHEN ◽  
TIEN-CHEN LIU
Keyword(s):  
Computed Tomography ◽  
Finite Element Analysis ◽  
Finite Element ◽  
High Resolution ◽  
Temporal Bone ◽  
Middle Ear ◽  
Histological Section ◽  
Slice Thickness ◽  
High Resolution Computed Tomography ◽  
Element Analysis

In order to present a systematic and practical approach that uses high-resolution computed tomography (HRCT) to derive models of the middle ear for finite element analysis (FEA). This prospective study included 31 subjects with normal hearing and no previous otological disorders. Temporal bone images obtained from 15 right ears and 16 left ears were used for evaluation and reconstruction. High-resolution computed tomography of temporal bone was performed using simultaneous acquisition of 16 sections with a collimated slice thickness of 0.625 mm. All images were transferred to an Amira visualization system for 3D reconstruction. The created 3-D model was translated into two commercial modeling packages, Patran and ANSYS, for finite element analysis. The characteristic dimensions of the model were measured and compared with previous published histological section data. This result confirms that the geometric model created by the proposed method is accurate except the tympanic membrane is thicker than that of histological section method. No obvious difference in the geometrical dimension between right and left ossicles was found (p > 0.05). The 3D model created by finite element method and predicted umbo and stapes displacements are close to the bounds of the experimental curves of Nishihara's, Huber's, and Gan's data across the frequency range of 100-8000 Hz. The model includes a description of the geometry of the middle ear components, and dynamic equations of vibration. The proposed method is quick, practical, low cost and most importantly, non-invasive as compared with histological section methods.

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