Reduced-Distortion Diffusion MRI of the Craniovertebral Junction

Iima, Mami; Yamamoto, Akira; Brion, V.; Okada, Tomohisa; Kanagaki, Mitsunori; Togashi, Kaori; Bihan, Denis Le

doi:10.3174/ajnr.a2969

Cited by 19 publications

(11 citation statements)

References 31 publications

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“…However, particularly when addressing skull base, frontopolar and brainstem structures for WMT, susceptibility artifacts and distortion related to the echo-planar imaging (EPI) diffusion MRI acquisition are of high importance (Treiber et al, 2016). Recent studies have addressed this challenge at the acquisition level using readout-segmented (RS) EPI, which was shown to significantly reduce distortions at the expense of increased acquisition time (Ginat et al, 2014, Iima et al, 2012, Koyasu et al, 2014). …”

Section: Infratentorialmentioning

confidence: 99%

White matter tractography for neurosurgical planning: A topography-based review of the current state of the art

Essayed

Zhang

Unadkat

et al. 2017

NeuroImage: Clinical

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166

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We perform a review of the literature in the field of white matter tractography for neurosurgical planning, focusing on those works where tractography was correlated with clinical information such as patient outcome, clinical functional testing, or electro-cortical stimulation. We organize the review by anatomical location in the brain and by surgical procedure, including both supratentorial and infratentorial pathologies, and excluding spinal cord applications. Where possible, we discuss implications of tractography for clinical care, as well as clinically relevant technical considerations regarding the tractography methods.We find that tractography is a valuable tool in variable situations in modern neurosurgery. Our survey of recent reports demonstrates multiple potentially successful applications of white matter tractography in neurosurgery, with progress towards overcoming clinical challenges of standardization and interpretation.

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Section: Infratentorialmentioning

confidence: 99%

White matter tractography for neurosurgical planning: A topography-based review of the current state of the art

Essayed

Zhang

Unadkat

et al. 2017

NeuroImage: Clinical

181

166

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“…As a result, susceptibility artifacts and a low sig-DWI of Prostate multiple segments in the readout direction. The superiority of this approach has been found in DWI and diffusion tensor imaging in some clinical settings, including examinations of the pediatric brain [18], stroke patients [19], skull base [20], brainstem and cranial nerves [21], craniovertebral junction [22], and breast [23]. To our knowledge, no studies have compared GRAPPA-accelerated rs-EPI DWI and GRAPPA-accelerated ss-EPI DWI in the visualization of the prostate during 3-T MRI.…”

mentioning

confidence: 99%

Feasibility Study of 3-T DWI of the Prostate: Readout-Segmented Versus Single-Shot Echo-Planar Imaging

Wang

Deng

et al. 2015

American Journal of Roentgenology

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G e nit ou r i n a r y I m ag i ng • O r ig i n a l Re s e a rc h AJR 2015; 205:70-76 0361-803X/15/2051-70 OBJECTIVE. The purpose of this prospective study was to assess the clinical utility of generalized autocalibrating partial parallel acquisition (GRAPPA)-accelerated readoutsegmented echo-planar imaging (rs-EPI) DWI and compare it with standard single-shot EPI ( ss-EPI) DWI in visualization of the prostate during 3-T MRI.SUBJECTS AND METHODS. One hundred sixteen consecutively registered patients (mean age, 63.5 years; range 24-93 years) underwent 3-T MRI that included rs-EPI DWI and standard ss-EPI DWI with identical FOVs, slices, acceleration factors, b values, and image postprocessing procedure. The datasets were independently evaluated by two blinded radiologists. Images were evaluated for sharpness, anatomic distortion, imaging contrast, lesion conspicuity, detailed anatomic visualization, and overall image quality on a 5-point Likert scale (1, nondiagnostic; 5, excellent).RESULTS. The kappa values were 0.73 for image sharpness, 0.71 for anatomic distortion, 0.54 for imaging contrast, 0.56 for lesion conspicuity, 0.61 for detailed anatomic visualization, and 0.63 for overall image quality (all p < 0.05), indicating moderate to substantial agreement between the two observers. The mean Likert scores for standard ss-EPI and rs-EPI were as follows: image sharpness, 2.9 and 4.6; distortion level, 2.8 and 4.4; contrast, 3.1 and 3.8; lesion conspicuity, 3.0 and 4.0; structure, 3.1 and 4.2; and overall image quality, 3.1 and 4.2. The rs-EPI DWI sequence was associated with significantly better image quality and fewer susceptibility artifacts than was ss-EPI (all p < 0.05). The rs-EPI sequence was considered better overall in 90% of cases.CONCLUSION. The technique of rs-EPI DWI combined with GRAPPA enables robust prostate imaging with high image quality and may provide great benefit in routine clinical practice. Li et al. DWI of Prostate Genitourinary Imaging Original Research Downloaded from www.ajronline.org by NYU Langone Med Ctr-Sch of Med on 07/02/15 from IP address 128.122.253.228. Copyright ARRS. For personal use only; all rights reserved AJR:205, July 2015

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“…RS-EPI can reduce acquisition time by partitioning the k -space into segments along the readout direction, and parallel imaging can reduce the echo train length, thus reducing image distortions with higher resolution and reducing blurring from T2/T2* signal intensity decay compared with SS-EPI [26]. The superiority of RS-EPI has been demonstrated for diffusion imaging of areas that are prone to strong susceptibility artifacts, such as the pediatric brain [27], breast [28], and craniovertebral junction [29]. The application of RS-EPI DTI in the cisternal segment of CN V was confirmed in this study.…”

Section: Discussionmentioning

confidence: 99%

Using Diffusion Tensor Imaging to Evaluate Microstructural Changes and Outcomes after Radiofrequency Rhizotomy of Trigeminal Nerves in Patients with Trigeminal Neuralgia

et al. 2016

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Trigeminal neuralgia is characterized by facial pain that may be sudden, intense, and recurrent. Our aim was to investigate microstructural tissue changes of the trigeminal nerve in patients with trigeminal neuralgia resulting from neurovascular compression by diffusion tensor imaging, and to test the predictive value of diffusion tensor imaging for determining outcomes after radiofrequency rhizotomy. Forty-three patients with trigeminal neuralgia were recruited, and diffusion tensor imaging was performed before radiofrequency rhizotomy. By selecting the cisternal segment of the trigeminal nerve manually, we measured the volume of trigeminal nerve, fractional anisotropy, apparent diffusion coefficient, axial diffusivity, and radial diffusivity. The apparent diffusion coefficient and mean value of fractional anisotropy, axial diffusivity, and radial diffusivity were compared between the affected and normal side in the same patient, and were correlated with pre-rhizotomy and post-rhizotomy visual analogue scale pain scores. The results showed the affected side had significantly decreased fractional anisotropy, increased apparent diffusion coefficient and radial diffusivity, and no significant change of axial diffusivity. The volume of the trigeminal nerve on affected side was also significantly smaller. There was a trend of fractional anisotropy reduction and visual analogue scale pain score reduction (P = 0.072). The results suggest that demyelination without axonal injury, and decreased size of the trigeminal nerve, are the microstructural abnormalities of the trigeminal nerve in patients with trigeminal neuralgia caused by neurovascular compression. The application of diffusion tensor imaging in understanding the pathophysiology of trigeminal neuralgia, and predicting the treatment effect has potential and warrants further study.

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Reduced-Distortion Diffusion MRI of the Craniovertebral Junction

Cited by 19 publications

References 31 publications

White matter tractography for neurosurgical planning: A topography-based review of the current state of the art

White matter tractography for neurosurgical planning: A topography-based review of the current state of the art

Feasibility Study of 3-T DWI of the Prostate: Readout-Segmented Versus Single-Shot Echo-Planar Imaging

Using Diffusion Tensor Imaging to Evaluate Microstructural Changes and Outcomes after Radiofrequency Rhizotomy of Trigeminal Nerves in Patients with Trigeminal Neuralgia

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