Application of Curved MPR Algorithm to High  Resolution 3 Dimensional T2 Weighted CISS  Images for Virtual Uncoiling of Membranous  Cochlea as an Aid for Cochlear Morphometry

Joish, Upendra Kumar; Kavitha, Y

doi:10.7860/jcdr/2017/23206.9456

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Extensive literature is also available regarding inner ear measurement for the diagnosis of inner ear malformations and surgical planning of electrode implantation. [6][7][8] Inner ear malformations are recognized by imaging in about 20% of children with congenital sensorineural hearing loss. Normal development of the inner ear structures can be affected by many factors, including genetic anomalies as well as environmental destructive causes (ischemic, infectious, radiation and more).…”

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confidence: 99%

High-resolution 3 T magnetic resonance findings in cochlear hypoplasias and incomplete partition anomalies: a pictorial essay

Talenti

Manara

Brotto

et al. 2018

BJR

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Main purposes for cross-sectional imaging in patients with sensorineural hearing loss (SNHL) are: to identify a possible malformation of the inner ear, define the anatomy of the temporal bone, study the auditory pathway from the cochlear nerve to the auditory cortex, identify associated brain anomalies and identify prognostic factors. 1 MRI with three-dimensional (3D) heavily T 2 weighted gradient-echo sequence allows a spatial resolution of up to 0.4 mm. Sagittal, coronal and oblique reconstructions can be performed. This means that not only cochlear and facial nerves can be better displayed, but also the modiolus, lamina spiralis and interscalar septum (ISS) can be visualized in details (Figure 1). 2 High-resolution CT is not able to show neither early cochlear obliteration nor central causes of hearing loss, 3 but is still necessary for pre-operative assessment of cochlear implants. 4 Of note, cone beam CT is an increasingly used tool that has shown to be able not only to assess middle ear and ossicular anomalies with superior performances compared to multidetector CT, but also to depict inner ear structures with extraordinary anatomical detail and with lower radiation dose. 5

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confidence: 99%

High-resolution 3 T magnetic resonance findings in cochlear hypoplasias and incomplete partition anomalies: a pictorial essay

Talenti

Manara

Brotto

et al. 2018

BJR

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“…MRI has been used to measure CDL and its main advantage is that it is more capable of indicating perilymphatic obstructions (31,32). When applied to constructive interference in steady state (CISS) protocol MRI scans, the cMPR reconstruction algorithm is useful in obtaining appropriate quality images of the membranous cochlea for accurate measurements (33). Furthermore, Otoplan is mainly designed for normal cochlea with 2.5 turns and the CDL is automatically predicted using the formula CDL ¼ 2.62Â(AÀ1) Âlog[1þU/235].…”

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confidence: 99%

Cochlear Duct Length Calculation: Comparison Between Using Otoplan and Curved Multiplanar Reconstruction in Nonmalformed Cochlea

Chen¹,

Tan

Jiang

et al. 2021

Otology &Amp; Neurotology

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Objective: To describe a new method to measure the cochlear parameters using Otoplan software, and to compare it with the traditional method using curved multiplanar reconstruction (cMPR). Study Design: Retrospective analysis using internal consistency reliability and paired sample t test. Setting: Tertiary referral center Patients: Thirty-four patients including 68 ears from a clinical trial were retrospectively reviewed. Main Outcome Measures: The length, width, height (distances A, B, H), and cochlear duct length of each cochlea were measured independently using two modalities: Otoplan and cMPR. Internal consistency reliability of the two modalities was analyzed. The time spent on each measurement was also recorded. Results: Otoplan software was compatible with all radiological data in this series. Distances A, B, and H showed no significant differences between Otoplan (9.33 AE 0.365, 6.6 1 AE 0 .35 9, an d 2.9 1 AE 0.312 mm) and cMPR (9.32 AE 0.314, 6.59 AE 0.342, and 2.93 AE 0.250 mm). The average cochlear duct length calculated by Otoplan was 34.37 AE 1.481 mm, which was not significantly different from that calculated by cMPR (34.55 AE 1.903mm, p ¼ 0.215). The measurements with Otoplan had better internal consistency reliability compared with those by cMPR, and measurements with a higher peak kilovoltage (140 kVp) CT scan showed further higher internal consistency reliability . Time spent on each cochlea by Otoplan was 5.9 AE 0.69 min, significantly shorter than that by cMPR (9.3 AE 0.72 min). Conclusion: Otoplan provides more rapid and reliable measurement of the cochlea than cMPR. Furthermore, it can be easily used in the laptop computer.

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“…Cochlear implant surgery requires accurate knowledge of the cochlear duct length (CDL) as the basis in treatment planning. The literature reveals varying percentages of interindividual differences between CDL according to gender (1,2), ethnicity (1)(2)(3) and imaging modality (4)(5)(6) used to determine CDL. Over-insertion of the electrode during cochlea implant surgery may result in trauma to the cochlear structure and loss of residual hearing (7,8).…”

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confidence: 99%

Determination of Cochlear Duct Length With 3DVersusTwo-dimensional Methods: A Retrospective Clinical Study of Imaging by Computed Tomography and Cone Beam Computed Tomography

Waldeck

Falck

Chapot

et al. 2021

In Vivo

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Background: The aim of this study was to compare three different methods for measurement of cochlear duct length (CDL) in the clinical setting for two different imaging modalities, namely computed tomography (CT) and cone-beam computed tomography (CBCT). Patients and Methods: One hundred temporal bone data sets (CT: n=50; CBCT: n=50) of non-malformed cochleae were retrospectively analyzed using three different CDL estimation techniques: 3D curved multiplanar reconstruction (cMPR), 2D cMPR and the A-value formula. Results: The data sets belonged to 60 patients (34 males, 26 females; mean age=50.28±18.58 years). For both imaging modalities, application of the 3D cMPR estimation technique led to significantly greater mean CDL values than the two-dimensional methods (p<0.0083). The CDL measurements viewed in CT imaging software were significantly shorter than the corresponding CBCT measurements (p<0.05). Using a linear mixed model, differences in CDL by sex (p=0.796), age (p=0.377) and side of ear (p=0.690) were not significant. Conclusion: The 3D cMPR technique was found to provide the most accurate in vivo CDL measurement in non-malformed cochlea in both CT and CBCT imaging compared to 2D methods. The study results also suggest that the higher spatial resolution in CBCT imaging results in more precise CDL determination than in CT.

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Application of Curved MPR Algorithm to High Resolution 3 Dimensional T2 Weighted CISS Images for Virtual Uncoiling of Membranous Cochlea as an Aid for Cochlear Morphometry

Cited by 3 publications

References 7 publications

High-resolution 3 T magnetic resonance findings in cochlear hypoplasias and incomplete partition anomalies: a pictorial essay

High-resolution 3 T magnetic resonance findings in cochlear hypoplasias and incomplete partition anomalies: a pictorial essay

Cochlear Duct Length Calculation: Comparison Between Using Otoplan and Curved Multiplanar Reconstruction in Nonmalformed Cochlea

Determination of Cochlear Duct Length With 3DVersusTwo-dimensional Methods: A Retrospective Clinical Study of Imaging by Computed Tomography and Cone Beam Computed Tomography

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