3D MR Neurography

Khalilzadeh, Omid; Fayad, Laura M.; Ahlawat, Shivani

doi:10.1055/s-0041-1730909

Cited by 17 publications

(10 citation statements)

References 52 publications

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“…15). 49,50 Whereas 2D FSE can typically be optimized to provide higher in-plane spatial resolution orthogonal to the nerve course, higher through-plane (~1 mm) can more easily be achieved with 3D imaging to depict the longitudinal course of the nerves 49 . To reduce scan time, 3D STIR-FSE sequences are typically compatible with techniques to reduce the FOV (eg, outer volume suppression) 44,46 …”

Section: Technical Considerationsmentioning

confidence: 99%

“…49,50 Whereas 2D FSE can typically be optimized to provide higher in-plane spatial resolution orthogonal to the nerve course, higher through-plane (~1 mm) can more easily be achieved with 3D imaging to depict the longitudinal course of the nerves. 49 To reduce scan time, 3D STIR-FSE sequences are typically compatible with techniques to reduce the FOV (eg, outer volume suppression). 44,46 Imaging Around Metal Brachial plexus MRN is sometimes performed around orthopedic metallic hardware (eg, clavicular fixation plate and screws or a total shoulder arthroplasty), resulting in susceptibility artifacts that may obscure normal anatomy and pathological changes (Fig.…”

Section: D Imagingmentioning

confidence: 99%

“…Using 3D FSE/TSE imaging (CUBE, SPACE, VISTA) in the BP region can help delineate pathology, especially when acquired isotropically and reformatted in orthogonal or curved planes. 49 In particular, curved multiplanar reformations created from isotropic 3D MRN acquisitions are valuable to referring physicians and for preoperative planning and can be used for cinematic, 3D rendering (Fig. 15).…”

Section: D Imagingmentioning

confidence: 99%

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Brachial Plexus Magnetic Resonance Neurography

et al. 2022

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Magnetic resonance neurography of the brachial plexus (BP) is challenging owing to its complex anatomy and technical obstacles around this anatomic region. Magnetic resonance techniques to improve image quality center around increasing nerve-to-background contrast ratio and mitigating imaging artifacts. General considerations include unilateral imaging of the BP at 3.0 T, appropriate selection and placement of surface coils, and optimization of pulse sequences. Technical considerations to improve nerve conspicuity include fat, vascular, and respiratory artifact suppression techniques; metal artifact reduction techniques; and 3-dimensional sequences. Specific optimization of these techniques for BP magnetic resonance neurography greatly improves image quality and diagnostic confidence to help guide nonoperative and operative management.

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Section: Technical Considerationsmentioning

confidence: 99%

Section: D Imagingmentioning

confidence: 99%

Section: D Imagingmentioning

confidence: 99%

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Brachial Plexus Magnetic Resonance Neurography

et al. 2022

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“…Furthermore, maximum intensity projection method (MIP) can be used for post processing of the 3D images to highlight nerve abnormalities (signal changes, continuity, nerve enlargement and compression, presence of intrinsic or extrinsic tumors) and tissues in their surroundings (muscle signal changes consistent with denervation, muscle atrophy, presence of pseudomeningocele in nerve root avulsions, haematomas, etc.) and to illustratively demonstrate peripheral nerve tracts in multiple planes ( 15 , 16 ). While playing a crucial role in examining the peripheral neuropathies, conventional and advanced MRN techniques cannot provide any information about the state of the nerve tracts in terms of their function.…”

Section: Introductionmentioning

confidence: 99%

Magnetic resonance tractography of the brachial plexus: step-by-step

Ibrahim¹,

Škoch²,

Herynek³

et al. 2022

Quant Imaging Med Surg

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Background: Magnetic resonance (MR) tractography of the brachial plexus (BP) is challenging due to different factors such as motion artifacts, pulsation artifacts, signal-to-noise ratio, spatial resolution; eddy currents induced geometric distortions, sequence parameters and choice of used coils. Notably challenging is the separation of the peripheral nerve bundles and skeletal muscles as both structures have similar fractional anisotropy values. We proposed an algorithm for robust visualization and assessment of BP root bundles using the segmentation of the spinal cord (SSC, C4-T1) as seed points for the initial starting area for the fibre tracking algorithm.Methods: Twenty-seven healthy volunteers and four patients with root avulsions underwent magnetic resonance imaging (MRI) examinations on a 3T MR scanner with optimized measurement protocols for diffusion-weighted images and coronal T2 weighted 3D short-term inversion recovery sampling perfection with application optimized contrast using varying flip angle evaluation sequences used for BP fibre reconstruction and MR neurography (MRN). The fibre bundles reconstruction was optimized in terms of eliminating the skeletal muscle fibres contamination using the SSC and the tracking threshold of the normalized quantitative anisotropy (NQA) on reconstruction of the BP. In our study, the NQA parameter has been used for fiber tracking instead of fractional anisotropy (FA). The diffusion data were processed in individual C4-T1 root bundles using the generalized q-sampling imaging (GQI) algorithm. Calculated diffusion parameters were statistically analysed using the two-sample t-test. The MRN was performed in MedINRIA and post-processed using the maximum intensity projection (MIP) method to demonstrate BP root bundles in multiple planes.Results: In control subjects, no significant effect of laterality in diffusion parameters was found (P>0.05) in the BP. In the central part of the BP, a significant difference between control subjects and patients at P=0.02 was found in the NQA values. Other diffusion parameters were not significantly different.Conclusions: Using NQA instead of FA in the proposed algorithm allowed for a better separation of muscle and root nerve bundles. The presented algorithm yields a high quality reconstruction of the BP bundles that may be helpful both in research and clinical practice.

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“…Images acquired with MRN provide a highly accurate depiction of the relationships between lesions and the nerve architecture, and the technique makes it possible to visualize neuromuscular alterations directly, thus facilitating an objective evaluation of the consequences of neuromuscular pathology (3) . In addition, highresolution isotropic volumetric 3D MRN enables multiplanar depiction of peripheral nerves, as well as allowing anatomical and functional characterization of various neural diseases (4) . In summary, imaging techniques ranging from ultrasound to highresolution isotropic 3D volumetric MRN are essential to evaluate conditions and diseases affecting the peripheral nerves, including entrapments, trauma, inflammatory or infectious neuropathies, and neoplasms.…”

mentioning

confidence: 99%

Imaging evaluation of peripheral nerves

Canella

2023

Radiol Bras

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3D MR Neurography

Cited by 17 publications

References 52 publications

Brachial Plexus Magnetic Resonance Neurography

Brachial Plexus Magnetic Resonance Neurography

Magnetic resonance tractography of the brachial plexus: step-by-step

Imaging evaluation of peripheral nerves

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