Imaging of the temporal bone

Touska, Philip; Connor, Steve

doi:10.1016/j.crad.2020.06.013

Cited by 11 publications

(16 citation statements)

References 153 publications

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“…The maximum level of contrast is reached between 3.5 and 4.5 h after IV administration [14,15]. Thin slice isotropic 3D TSE FLAIR is currently the most frequently applied IV post-Gd EH imaging sequence [1][2][3][4][5][6]. It is a robust sequence, requiring no postprocessing, with a very high diagnostic accuracy for the detection of EH and asymmetrical PE in patient with definite MD [2][3][4][5][6].…”

Section: Discussionmentioning

confidence: 99%

“…In the past decade, it has become feasible to discriminate endolymphatic hydrops (EH)-the morphological substrate of Menière's disease (MD)-using delayed post-gadolinium (Gd) magnetic resonance imaging (MRI) [1][2][3][4][5][6]. Combining additional image markers with EH such as the degree of perilymphatic enhancement (PE) has recently been described as highly specific for MD [3,5].…”

Section: Introductionmentioning

confidence: 99%

“…Whereas, originally, 3D REAL IR was a single sequence developed for the IT administration of Gd-in which by adapting the inversion time endolymphatic space, perilymphatic space, and surrounding bone can be separately visualized-it has nowadays evolved for IV Gd use into a process of subtraction of imaging series with a different inversion time and/or a heavily T2-weighted MR cisternography (MRC) sequence [7][8][9][10]. 3D TSE FLAIR does not require this complex postprocessing involving subtraction of imaging series like 3D REAL IR sequences, being time-consuming, and with potential misregistration [2,6]. Heavily T2-weighted 3D FLAIR (hT 2 w-3D-FLAIR) sequence with constant flip angle (CFA) has previously been reported in 2 small patient groups as being more sensitive to low concentrations of Gd enabling visualization of EH [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Comparison between 3D SPACE FLAIR and 3D TSE FLAIR in Menière’s disease

et al. 2022

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Purpose Heavily T2-weighted 3D FLAIR (hT2w-3D-FLAIR) sequence with constant flip angle (CFA) has been reported as being more sensitive to low concentrations of gadolinium (Gd) enabling endolymphatic hydrops (EH) visualization. The purpose of this study was to compare signal-to-noise (SNR) ratio, detection rate of EH, and increased perilymphatic enhancement (PE) as well as diagnostic accuracy in diagnosing definite Menière’s disease (MD), using 3D-SPACE FLAIR versus conventional 3D-TSE FLAIR. Methods This retrospective study included 29 definite MD patients who underwent a 4-h delayed intravenous (IV) Gd-enhanced 3D-TSE FLAIR and 3D-SPACE FLAIR MRI between February 2019 and February 2020. MR images were qualitatively and quantitatively analyzed twice by 2 experienced head and neck radiologists. Qualitative assessment included grading of cochlear and vestibular EH and visual comparison of PE. Quantitative assessment of PE was performed by placing a region of interest (ROI) and ratio calculation in the basal turn of the cochlea and the brainstem. Results The intra- and inter-reader reliability for grading of EH and PE was excellent (0.7 < kappa < 0.9) for 3D-SPACE FLAIR and exceeded the values for 3D-TSE FLAIR (0.5 < kappa < 0.9) The combination of EH and visual assessment of PE has the highest diagnostic accuracy in diagnosing definite MD on 3D-SPACE FLAIR with a sensitivity of 0.91 and a specificity of 0.98 resulting in a sensitivity raise of 6% compared to 3D-TSE FLAIR. Conclusion Four-hour delayed IV Gd-enhanced 3D-SPACE FLAIR sequence has a higher sensitivity and reproducibility than 3D-TSE FLAIR for the visualization of EH and increased PE in definite MD patients.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison between 3D SPACE FLAIR and 3D TSE FLAIR in Menière’s disease

et al. 2022

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“…Técnicas de imágenes ponderadas en secuencia de Diffusion-Weighted Imaging (DWI), basadas en la secuencia convencional spin-eco (SE) ponderada en T2, se han vuelto populares en la identificación del colesteatoma debido a su mayor precisión y adquisición más corta en relación con la RM contrastada 16 . La introducción de imágenes non-Echo-Planar Imaging (non-EPI-DWI) ha permitido obtener cortes más delgados con mínimos artefactos, logrando optimizar la detección de lesiones pequeñas, con sensibilidad y especificidad mayor al 90% 7,16,17,[19][20][21] . De este modo, esta sería una técnica confiable para el diagnóstico tanto de colesteatoma y la evaluación de sus complicaciones, contribuyendo al otorrinolaringólogo en la toma de decisiones.…”

Section: Discussionunclassified

Colesteatoma de oído con complicación intracraneana en contexto de pandemia COVID-19: Reporte de caso clínico y revisión de literatura

Navarro¹,

Hidalgo²,

Sepulveda

et al. 2021

Rev. Otorrinolaringol. Cir. Cabeza Cuello

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“…Pathologies of the middle and inner ear, such as malformations, inflammation, trauma and especially cancer can be assessed precisely for preoperative planning [1]. High positive and negative predictive values of up to 91% for intraoperative findings involving middle ear structures-i.e., ossicles or the round window-as well as the extent of cholesteatoma and neoplasms have been described in earlier studies on high-resolution CTs of the temporal bone [2][3][4][5]. Otologic surgeons, therefore, prefer high-resolution CTs to avoid image noise and the blurred visualization of subtle temporal bone structures.…”

Section: Introductionmentioning

confidence: 99%

ALADA Dose Optimization in the Computed Tomography of the Temporal Bone: The Diagnostic Potential of Different Low-Dose CT Protocols

et al. 2021

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Objective: Repeated computed tomography (CT) is essential for diagnosis, surgical planning and follow-up in patients with middle and inner ear pathology. Dose reduction to “as low as diagnostically acceptable” (ALADA) is preferable but challenging. We aimed to compare the diagnostic quality of images of subtle temporal bone structures produced with low doses (LD) and reference protocols (RP). Methods: Two formalin-fixed human cadaver heads were scanned using a 64-slice CT scanner and cone-beam CT (CBCT). The protocols were: RP (120 kV, 250 mA, CTDIvol 83.72 mGy), LD1 (100 kV, 80 mA, CTDIvol 26.79 mGy), LD2 (100 kV, 35 mA, CTDIvol 7.66 mGy), LD3 (80 kV, 40 mA, CTDIvol 4.82 mGy), and CBCT standard protocol. Temporal bone structures were assessed using a 5-point scale. Results: A median score of ≥2 was achieved with protocols such as the tendons of m. tensor tympani (RP/LD1/LD2/CBCT) and m. stapedius (CBCT), the incudostapedial joint (RP/LD1/CBCT), the incudomalleolar joint (RP/LD1/LD2/CBCT), the stapes feet (RP/LD1/CBCT), the stapes head (RP/LD1/LD2/CBCT), the tympanic membrane (RP/LD1/LD2/CBCT), the lamina spiralis ossea (none), the chorda tympani (RP/LD1/CBCT), and the modiolus (RP/LD1/LD2/CBCT). Adaptive statistical iterative reconstructions did not show advantages over the filtered back projection. Conclusions: LD protocols using a CTDIvol of 7.66 mGy may be sufficient for the identification of temporal bone structures.

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Imaging of the temporal bone

Cited by 11 publications

References 153 publications

Comparison between 3D SPACE FLAIR and 3D TSE FLAIR in Menière’s disease

Comparison between 3D SPACE FLAIR and 3D TSE FLAIR in Menière’s disease

Colesteatoma de oído con complicación intracraneana en contexto de pandemia COVID-19: Reporte de caso clínico y revisión de literatura

ALADA Dose Optimization in the Computed Tomography of the Temporal Bone: The Diagnostic Potential of Different Low-Dose CT Protocols

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