Evaluation of a temporal bone prototype by experts in otology

2014 ◽  
Vol 128 (7) ◽  
pp. 586-590 ◽  
Author(s):  
M Chenebaux ◽  
E Lescanne ◽  
A Robier ◽  
S Kim ◽  
D Bakhos
Keyword(s):  
Temporal Bone ◽  
Drilling Process ◽  
Bone Drilling ◽  
Posterior Semicircular Canal ◽  
Satisfaction Rate ◽  
Computed Tomography Images ◽  
Item Questionnaire ◽  
Drilling Technique ◽  
Temporal Bones

AbstractBackground:Inexperienced otologists require training on the temporal bone drilling process, prior to any surgical activity. The shortage of cadaveric temporal bones exerts pressure to create realistic physical prototypes. This paper describes the evaluation by otology experts of a specially developed temporal bone resin model.Methods:Computed tomography images were transformed into digital files, and anatomically identical right temporal bone models were created using stereolithography. These hand-painted resin prototypes were sent to 25 otologists, accompanied by a 20-item questionnaire.Results:Satisfaction rate was 92 per cent. The overall prototype score was 48.87 out of 60. Average scores were: 12.63 out of 15 for anatomy-morphology, 6.98 out of 9 for quality of drilling, 16.74 out of 21 for identification of anatomical elements and 7.41 out of 9 for stages of drilling. Limitations of the model included an excessively vivid facial nerve colour and difficulty in identifying the posterior semicircular canal. Disadvantages related to the thickness of the resin and its residues were identified.Conclusion:The prototype appears to provide an attractive solution to the shortage of cadaveric temporal bones. However, interest in the model for drilling technique training for inexperienced otologists has not yet been assessed.

Cholesteatoma in three dimensions: a teaching tool and an aid to improved pre-operative consent

2009 ◽  
Vol 124 (2) ◽  
pp. 126-131 ◽  
Author(s):  
D P Morris ◽  
R G Van Wijhe
Keyword(s):  
Temporal Bone ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Teaching Tool ◽  
Surgical Experience ◽  
Teaching Programme ◽  
Computed Tomography Images ◽  
Three Dimensional Models ◽  
Temporal Bones ◽  
User Friendly

AbstractBackground:Otological surgeons face two recurring challenges. Firstly, we must foster an appreciation of the complex, three-dimensional anatomy of the temporal bone in order to enable our trainees to operate safely and independently. Secondly, we must explain to our patients the necessity for surgery which carries the potential for serious complication.Methods:Amira® software was applied to pre-operative computed tomography images of temporal bones with cholesteatoma, to create three-dimensional computer images. Normal structures and cholesteatoma were displayed in a user-friendly, interactive format, allowing both trainee and patient to visualise disease and important structures within the temporal bone.Results:Three cases, and their three-dimensional computer models are presented. Zoom, rotation and transparency functions complemented the three-dimensional effect.Conclusion:These three-dimensional models provided a useful adjunct to cadaveric temporal bone dissection and surgical experience for our residents' teaching programme. Also, patients with cholesteatoma reported a better understanding of their pre-operative condition when the models were used during the consenting process.

scholarly journals Risk of Posterior Semicircular Canal Trauma when using a Retrosigmoid approach for Acoustic Neuroma Surgery and role of Endoscopy: An Imaging Study

2018 ◽  
Vol 97 (1-2) ◽  
pp. 24-30 ◽  
Author(s):  
Ali Kouhi ◽  
Varasteh Vakili Zarch ◽  
Ali Pouyan
Keyword(s):  
Temporal Bone ◽  
Semicircular Canal ◽  
Internal Auditory Canal ◽  
Imaging Study ◽  
Hearing Preservation ◽  
Neoplastic Disease ◽  
Posterior Semicircular Canal ◽  
Temporal Bone Ct ◽  
Temporal Bones

The rate of hearing preservation after vestibular schwannoma surgery is variable and is not as high as expected, possibly due to injuries to the posterior semicircular canal while exposing the tumor. The aim of this study was to estimate the risk of posterior semicircular canal injuries using temporal bone computed tomography (CT) scan findings. Temporal bone CT scans of 30 patients selected between 2013 and 2015 were studied. The median age of the patients was 40 years. Two planes were studied: (1) the axial plane that shows the common crus of the posterior semicircular canal and (2) the coronal plane that shows the two crura of the posterior semicircular canal. Five lines were drawn and four angles and three distances were measured. In this study, we divided the patients into three groups consisting of 10 patients each: (1) patients with no evidence of inflammatory or neoplastic disease, (2) those with chronic ear disease, and (3) those with vestibular schwannomas. The portion of the internal auditory canal that was exposed by drilling while preserving the posterior semicircular canal was 53 to 64% and 61 ± 9% in whole temporal bones in the three groups. The mean angle of vision with an endoscope was less than 105° in 56% of cases, which means even with a 30° endoscope, the fundus could not be visualized. Therefore, according to our data, it seemed impossible to expose the whole length of the internal auditory canal from the porus to the fundus without causing injury to the posterior semicircular canal. However, the use of endoscopes may help to prevent injury.

scholarly journals Risk of Posterior Semicircular Canal Trauma When Using a Retrosigmoid Approach for Acoustic Neuroma Surgery and Role of Endoscopy: An Imaging Study

2018 ◽  
Vol 97 (1-2) ◽  
pp. 24-30
Author(s):  
Ali Kouhi ◽  
Varasteh Vakili Zarch ◽  
Ali Pouyan
Keyword(s):  
Temporal Bone ◽  
Semicircular Canal ◽  
Internal Auditory Canal ◽  
Imaging Study ◽  
Hearing Preservation ◽  
Neoplastic Disease ◽  
Posterior Semicircular Canal ◽  
Temporal Bone Ct ◽  
Temporal Bones

The rate of hearing preservation after vestibular schwannoma surgery is variable and is not as high as expected, possibly due to injuries to the posterior semicircular canal while exposing the tumor. The aim of this study was to estimate the risk of posterior semicircular canal injuries using temporal bone computed tomography (CT) scan findings. Temporal bone CT scans of 30 patients selected between 2013 and 2015 were studied. The median age of the patients was 40 years. Two planes were studied: (1) the axial plane that shows the common crus of the posterior semicircular canal and (2) the coronal plane that shows the two crura of the posterior semicircular canal. Five lines were drawn and four angles and three distances were measured. In this study, we divided the patients into three groups consisting of 10 patients each: (1) patients with no evidence of inflammatory or neoplastic disease, (2) those with chronic ear disease, and (3) those with vestibular schwannomas. The portion of the internal auditory canal that was exposed by drilling while preserving the posterior semicircular canal was 53 to 64% and 61 ± 9% in whole temporal bones in the three groups. The mean angle of vision with an endoscope was less than 105° in 56% of cases, which means even with a 30° endoscope, the fundus could not be visualized. Therefore, according to our data, it seemed impossible to expose the whole length of the internal auditory canal from the porus to the fundus without causing injury to the posterior semicircular canal. However, the use of endoscopes may help to prevent injury.

scholarly journals The effect of virtual reality on temporal bone anatomy evaluation and performance

2021 ◽  
Author(s):  
Tomi Timonen ◽  
Aarno Dietz ◽  
Pia Linder ◽  
Antti Lehtimäki ◽  
Heikki Löppönen ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Temporal Bone ◽  
User Experience ◽  
Anatomical Landmarks ◽  
Expert Group ◽  
Cross Sectional ◽  
Performance Time ◽  
Computed Tomography Images ◽  
Temporal Bone Anatomy ◽  
Temporal Bones

Abstract Purpose There is only limited data on the application of virtual reality (VR) for the evaluation of temporal bone anatomy. The aim of the present study was to compare the VR environment to traditional cross-sectional viewing of computed tomography images in a simulated preoperative planning setting in novice and expert surgeons. Methods A novice (n = 5) and an expert group (n = 5), based on their otosurgery experience, were created. The participants were asked to identify 24 anatomical landmarks, perform 11 distance measurements between surgically relevant anatomical structures and 10 fiducial markers on five cadaver temporal bones in both VR environment and cross-sectional viewings in PACS interface. The data on performance time and user-experience (i.e., subjective validation) were collected. Results The novice group made significantly more errors (p < 0.001) and with significantly longer performance time (p = 0.001) in cross-sectional viewing than the expert group. In the VR environment, there was no significant differences (errors and time) between the groups. The performance of novices improved faster in the VR. The novices showed significantly faster task performance (p = 0.003) and a trend towards fewer errors (p = 0.054) in VR compared to cross-sectional viewing. No such difference between the methods were observed in the expert group. The mean overall scores of user-experience were significantly higher for VR than cross-sectional viewing in both groups (p < 0.001). Conclusion In the VR environment, novices performed the anatomical evaluation of temporal bone faster and with fewer errors than in the traditional cross-sectional viewing, which supports its efficiency for the evaluation of complex anatomy.

scholarly journals Study of Sigmoid Sinus Variations in the Temporal Bone by Micro Dissection and its Classification – A Cadaveric Study

2019 ◽  
Vol 23 (03) ◽  
pp. e311-e316 ◽  
Author(s):  
Anup Singh ◽  
David Victor Kumar Irugu ◽  
Kapil Sikka ◽  
Hitesh Verma ◽  
Alok Thakar
Keyword(s):  
Temporal Bone ◽  
Semicircular Canal ◽  
Sigmoid Sinus ◽  
Point Of View ◽  
Posterior Semicircular Canal ◽  
Mastoid Pneumatization ◽  
Clinical Point ◽  
Temporal Bones ◽  
Grade Iii

Introduction Sigmoid sinus (SS) variations have been classified variously in the literature. These classifications suffer from some form of shortcoming from a clinical point of view for their application. Objective We propose a clinically relevant classification of the SS in relation to the posterior semicircular canal (PSCC) and to the exposure of the presigmoid dural plate. The positioning of the SS was analyzed with reference to the volume of the mastoid and to the level of mastoid pneumatization. Methods A total of 94 formalin-preserved human cadaveric temporal bones were microdissected to carry out a complete mastoidectomy. The SS, the presigmoid dural plate, and the PSCC were exposed, and the position of the former was analyzed in relation to the latter two in order to classify the position of the SS into three grades. Results Grade I had the best exposure of the presigmoid dura and of the PSCC, while grade III had the poorest exposure of the presigmoid dura and of the PSCC. Grade I SS was associated with good pneumatization and higher mastoid volumes compared with grades II and III. Conclusions The SS exhibits considerable anatomic variability. A favorable positioning of the SS is associated with a large mastoid volume and pneumatization. A careful preoperative study of the imaging may help in understanding the positioning of the SS and the safety of various transmastoid approaches.

Importance of a dedicated neuroradiologist in reporting high-resolution computed tomography for otosclerosis: a retrospective comparison study of 40 patients

2017 ◽  
Vol 131 (6) ◽  
pp. 492-496 ◽  
Author(s):  
H Kanona ◽  
I Rana ◽  
C Offiah ◽  
N Patel
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Temporal Bone ◽  
Correct Identification ◽  
Bone Imaging ◽  
High Resolution Computed Tomography ◽  
Imaging Protocol ◽  
Computed Tomography Images ◽  
Temporal Bone Imaging ◽  
Temporal Bones

AbstractObjectives:This study aimed to compare the reporting of high-resolution computed tomography of temporal bones for otosclerosis by general radiologists and a neuroradiologist within a local National Health Service Trust.Methods:A retrospective case review of 36 high-resolution temporal bone computed tomography images obtained between 2008 and 2015 from 40 otosclerosis patients (surgically confirmed) was performed in a district general hospital setting. The main outcome measures were correct identification of otosclerosis by high-resolution computed tomography and adherence to the petrous temporal bone imaging protocol.Results:Correct diagnosis rates were significantly different when made by general radiologists vs a neuroradiologist (p < 0.0001; two-tailed Fisher's exact test). None of the high-resolution computed tomography scans adhered to the temporal bone imaging protocol.Conclusion:The use of high-resolution computed tomography for suspected otosclerosis is helpful for diagnosis, disease staging, obtaining informed consent, surgical planning and prognosis. This study suggests that radiological detection of otosclerotic changes by high-resolution computed tomography of the temporal bone is significantly better when performed by a dedicated neuroradiologist than by a general radiologist. Use of a standardised temporal bone computed tomography protocol is recommended to provide consistently high-quality images for maximising disease detection.

A Study of Picosecond-Laser Drilling Technique in Ceramics

2014 ◽  
Vol 1082 ◽  
pp. 117-122
Author(s):  
Ying Lu Hu ◽  
Wang Bin ◽  
Bo Lu ◽  
Qian Tao Cao ◽  
Chao Yang ◽  
...  
Keyword(s):  
Processing Speed ◽  
Laser Processing ◽  
Laser Power ◽  
Picosecond Laser ◽  
Lower Surface ◽  
Drilling Process ◽  
Laser Machine ◽  
Drilling Technique ◽  
The Difference

In this paper, the technique of drilling process with picosecond(ps) laser is studiedinAl2O3 ceramics. The defocus method is used to drill the ceramic slice, which is able to improve thedrilling ratio of depth to diameter.It is found out that the best location ofthis ps-laser is about0.15mm under the lower surface of workpiece,demonstrating the difference from nanosecond(ns)-laser machinein the respective ofdefocusing.The impact of the power and the processing speed isinvestigated on the quality of the drilling. For ps-laser machine,a smaller and high qualitythrough-holeis achievable by increasing the power of laser and reducing the speed of process, withthe ratio of depth to diameter from 3.12 to 4.27.The ratio can be further increased upto 6.25,throughoptimization of these three parameters: defocusing amount, laser power and laser processing speed.

Otologic Histopathology of Fabry's Disease

1989 ◽  
Vol 98 (5) ◽  
pp. 359-363 ◽  
Author(s):  
Patricia A. Schachern ◽  
Michael M. Paparella ◽  
Donald A. Shea ◽  
Tae H. Yoon
Keyword(s):  
Temporal Bone ◽  
Ganglion Cells ◽  
Spiral Ganglion ◽  
Cell Loss ◽  
The Body ◽  
Spiral Ligament ◽  
Fabry’S Disease ◽  
Fabry's Disease ◽  
Temporal Bones ◽  
Spiral Ganglia

Fabry's disease is a rare progressive X-linked recessive disorder of glycosphingolipid metabolism. The accumulation of glycosphingolipids occurs in virtually all areas of the body, including the endothelial, perithelial, and smooth-muscle cells of blood vessels, the ganglion cells of the autonomic nervous system, and the glomeruli and tubules of the kidney. Although otologic symptoms have been described in these patients, to our knowledge there have been no temporal bone histopathologic reports. We describe the clinical histories, audiometric results, and temporal bone findings of two patients with this rare disorder. Both patients demonstrated a bilateral sloping sensorineural hearing loss audiometrically. Middle ear findings of seropurulent effusions and hyperplastic mucosa were seen in all four temporal bones. Strial and spiral ligament atrophy in all turns, and hair cell loss mainly in the basal turns, were also common findings. The number of spiral ganglion cells was reduced in all temporal bones; however, evidence of glycosphingolipid accumulation was not observed in the spiral ganglia.

scholarly journals Temporal Bone Pathology in Maxillary Sinus Carcinoma; A Study of 25 Temporal Bones.

1991 ◽  
Vol 84 (9) ◽  
pp. 1259-1265 ◽  
Author(s):  
Yasuyuki Ohira ◽  
Kimitaka Kaga ◽  
Keiyu Uebo ◽  
Akira Kodama
Keyword(s):  
Maxillary Sinus ◽  
Temporal Bone ◽  
Bone Pathology ◽  
Temporal Bones

Translation and validation of the first time fathers questionnaire into Persian

2021 ◽  
Vol 29 (10) ◽  
pp. 572-578
Author(s):  
Khadijeh Dodel ◽  
Giti Ozgoli ◽  
Aasa Premberg ◽  
Nillofar Ghasemi ◽  
Sedigheh Sedigh Mobarakabadi ◽  
...  
Keyword(s):  
Cronbach’S Alpha ◽  
Labor Support ◽  
Four Dimensions ◽  
Cronbach's Alpha ◽  
Item Questionnaire ◽  
Confirmatory Factor ◽  
First Time ◽  
Translation And Validation ◽  
Item Distribution

Background/Aims The presence of fathers during labour and birth can have favourable outcomes for the health of the mother, father and infant. However, there are few studies on fathers' experiences while being present during labour and birth, which necessitates the development of a valid questionnaire for this purpose. The aim of this study was to translate and culturally adapt the first time fathers questionnaire into Persian. Methods A total of 220 first-time fathers at private midwifery counseling centers were given a translated questionnaire to complete. Forward-backward translation of the questionnaire was conducted and content, face and construct validity were examined. After extracting factors and item distribution, confirmatory factor analysis was performed. Cronbach's alpha was used for reliability. Results A valid 19-item questionnaire with four dimensions, ‘worry’, ‘acceptance and support during labor’, ‘support during and after birth’, and ‘preparedness’ was obtained. The Cronbach's alpha was 0.78. Conclusions The Persian questionnaire is valid and reliable for examining the experiences of first-time fathers. It can be employed to evaluate fathers' experiences during labour and birth in midwifery services planning to promote quality of care during childbirth.

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