7.0 Tesla MRI tractography in patients with trigeminal neuralgia

Moon, Hyeong Cheol; You, Soon-Tae; Baek, Hyeon Man; Jeon, Young Jai; Park, Chan-A; Cheong, Jei Jun; Lee, Youn Joo; Park, Young Seok

doi:10.1016/j.mri.2017.12.033

Cited by 30 publications

(23 citation statements)

References 44 publications

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“…Additionally, the continuous development of surface coils and scanning at higher field strengths may provide additional SNR boost to optimize spatial resolution, reducing the need for alternative processing solutions. These improvements, however, come at the expense of increased cost and, in the case of 7.0T scanning, increased susceptibility to distortion and field inhomogeneities …”

Section: Discussionmentioning

confidence: 99%

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Denoising of diffusion MRI improves peripheral nerve conspicuity and reproducibility

Sneag

Zochowski

Tan

et al. 2019

Magnetic Resonance Imaging

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Background Quantitative diffusion MRI is a promising technique for evaluating peripheral nerve integrity but low signal‐to‐noise ratio (SNR) can impede measurement accuracy. Purpose To evaluate principal component analysis (PCA) and generalized spherical deconvolution (genSD) denoising techniques to improve within‐subject reproducibility and peripheral nerve conspicuity. Study Type Prospective. Subjects Seven healthy volunteers and three peripheral neuropathy patients. Field Strength/Sequence 3T/multiband single‐shot echo planar diffusion sequence using multishell 55‐direction scheme. Assessment Images were processed using four methods: "original" (no denoising), "average" (10 repetitions), "PCA‐only," and "PCA + genSD." Tibial and common peroneal nerve segmentations and masks were generated from volunteer diffusion data. Quantitative (SNR and contrast‐to‐noise ratio [CNR]) values were calculated. Three radiologists qualitatively evaluated nerve conspicuity for each method. The two denoising methods were also performed in three patients with peripheral neuropathies. Statistical Tests For healthy volunteers, calculations included SNR and CNRFA (computed using FA values). Coefficient of variation (CV%) of CNRFA quantified within‐subject reproducibility. Groups were compared with two‐sample t‐tests (significance P < 0.05; two‐tailed, Bonferroni‐corrected). Odds ratios (ORs) quantified the relative rates of each of three radiologists confidently identifying a nerve, per slice, for the four methods. Results "PCA + genSD" yielded the highest SNR (meanoverall = 14.83 ± 1.99) and tibial and common peroneal nerve CNRFA (meantibial = 3.45, meanperoneal = 2.34) compared to "original" (P SNR < 0.001; P CNR = 0.011) and "PCA‐only" (P SNR < 0.001, P CNR < 0.001). "PCA + genSD" had higher within‐subject reproducibility (low CV%) for tibial (6.04 ± 1.98) and common peroneal nerves (8.27 ± 2.75) compared to "original" and "PCA‐only." The mean FA was higher for "original" than "average" (P < 0.001), but did not differ significantly between "average" and "PCA + genSD" (P = 0.14). "PCA + genSD" had higher tibial and common peroneal nerve conspicuity than "PCA‐only" (ORtibial = 2.50, P < 0.001; ORperoneal = 1.86, P < 0.001) and "original" (ORtibial = 2.73, P < 0.001; ORperoneal = 2.43, P < 0.001). Data Conclusion PCA + genSD denoising method improved SNR, CNRFA, and within‐subject reproducibility (CV%) without biasing FA and nerve conspicuity. This technique holds promise for facilitating more reliable, unbiased diffusion measurements of peripheral nerves. Level of Evidence: 2 Technical Efficacy Stage: 1 J. Magn. Reson. Imaging 2020;51:1128–1137.

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Section: Discussionmentioning

confidence: 99%

“…These improvements, however, come at the expense of increased cost 37 and, in the case of 7.0T scanning, increased susceptibility to distortion and field inhomogeneities. 37,38…”

Section: Limitations and Conclusionmentioning

confidence: 99%

Denoising of diffusion MRI improves peripheral nerve conspicuity and reproducibility

Sneag

Zochowski

Tan

et al. 2019

Magnetic Resonance Imaging

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“…Fourth, the FN by perform diffusion tensor imaging (DTI) was not evaluated. In many previous articles, cranial nerves were depicted using DTI . More recently, Henssen et al reported that trigeminal pathways in postmortem human brainstems could be delineated using track density imaging and tractography at 11.7T MRI .…”

Section: Discussionmentioning

confidence: 99%

Facial nerve atrophy in patients with amyotrophic lateral sclerosis: Evaluation with fast imaging employing steady‐state acquisition (FIESTA)

Miyata

Kakeda

Hashimoto

et al. 2019

Magnetic Resonance Imaging

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Background In amyotrophic lateral sclerosis (ALS), motor neurons in the brainstem markedly deplete, whereas sensory neurons are less severely affected. Purpose To determine whether facial nerve (FN) measurement on 3D fast imaging employing steady‐state acquisition (FIESTA) is useful for ALS diagnosis. Study Type Retrospective. Subjects Fifteen ALS patients and 16 controls. Field Strength/Sequence 3T FIESTA MR. Assessment The cross‐sectional area of the FN and cochlear nerve (CN) were measured, and the FN/CN ratio (FCR) was assessed. For qualitative assessment, the FN cross‐sectional area was compared with that of the CN and the following scores were assigned: score 1 (large), the FN is larger than the CN; score 2 (almost equal), the size difference between the FN and CN is within 10%; score 3 (small), the FN is smaller than the CN (10–50%); score 4 (significantly small), size of the FN is less than half the size of the CN. Statistical Tests The differences in FCR between the ALS patients and the controls were tested using the Wilcoxon Mann–Whitney U‐test. For the qualitative and quantitative assessments, we performed a receiver operating characteristic analysis for the diagnosis of ALS with an abnormal finding as score 3 or 4. Results The mean FCR was significantly smaller for ALS patients (0.71 ± 0.17) than for controls (0.95 ± 0.08) (P < 0.001) and the area under the curve was 0.93. When an FN score was 3 or 4, indicative of FN atrophy, the sensitivity and specificity values of FIESTA for discriminating ALS patients from controls were 93.3% (14/15) and 90.0% (18/20), respectively. Data Conclusion The FN atrophy revealed on FIESTA, which may reflect lower motor neuron impairment in ALS, allowed us to distinguish ALS patients from controls with a high degree of accuracy. Level of Evidence: 3 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2020;51:757–766.

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“…Therefore, 7T TOF may be particularly useful for patients with trigeminal neuralgia in whom lower-field scanning fails to confirm vascular compression. Although studies have applied 7T MR imaging to trigeminal imaging, 66 no 7T study has coupled high-resolution TOF with structural or diffusion MR imaging to characterize neurovascular compression. Fusion of structural and high-resolution TOF imaging in trigeminal neuralgia is possible (Fig 4).…”

Section: Neurovascular Pathologymentioning

confidence: 99%

Emerging Use of Ultra-High-Field 7T MRI in the Study of Intracranial Vascularity: State of the Field and Future Directions

Rutland¹,

Delman

Gill³

et al. 2019

AJNR Am J Neuroradiol

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Cerebrovascular disease is a major source of mortality that commonly requires neurosurgical intervention. MR imaging is the preferred technique for imaging cerebrovascular structures, as well as regions of pathology that include microbleeds and ischemia. Advanced MR imaging sequences such as time-of-flight, susceptibility-weighted imaging, and 3D T2-weighted sequences have demonstrated excellent depiction of arterial and venous structures with and without contrast administration. While the advantages of 3T compared with 1.5T have been described, the role of ultra-high-field (7T) MR imaging in neurovascular imaging remains poorly understood. In the present review, we examine emerging neurosurgical applications of 7T MR imaging in vascular imaging of diverse conditions and discuss current limitations and future directions for this technique.

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7.0 Tesla MRI tractography in patients with trigeminal neuralgia

Cited by 30 publications

References 44 publications

Denoising of diffusion MRI improves peripheral nerve conspicuity and reproducibility

Denoising of diffusion MRI improves peripheral nerve conspicuity and reproducibility

Facial nerve atrophy in patients with amyotrophic lateral sclerosis: Evaluation with fast imaging employing steady‐state acquisition (FIESTA)

Emerging Use of Ultra-High-Field 7T MRI in the Study of Intracranial Vascularity: State of the Field and Future Directions

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7.0 Tesla MRI tractography in patients with trigeminal neuralgia

Cited by 30 publications

References 44 publications

Denoising of diffusion MRI improves peripheral nerve conspicuity and reproducibility

Denoising of diffusion MRI improves peripheral nerve conspicuity and reproducibility

Facial nerve atrophy in patients with amyotrophic lateral sclerosis: Evaluation with fast imaging employing steady‐state acquisition (FIESTA)

Emerging Use of Ultra-High-Field 7T MRI in the Study of Intracranial Vascularity: State of the Field and Future Directions

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7.0 Tesla MRI tractography in patients with trigeminal neuralgia