Bezier surface reformation: an original visualization technique of cervical nerve roots on myelographic CT

Yoshioka, Naoki; Hayashi, Naoto; Akahane, Masaaki; Yoshikawa, Tsuneo; Takeshita, Katsushi; Ohtomo, Kuni

doi:10.1007/s11604-006-0067-5

Cited by 6 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A Bezier surface is a parametric surface defined by mathematic formulas in terms of a set of control points. Yoshioka et al (36) developed interactive software to generate Bezier surface reformatted images from CT myelographic volume data. An operator plots several control points along nerve roots, and Bezier surface reformatted images are automatically obtained by depicting the corresponding pixel on the cubic Bezier patches.…”

Section: Radiographics Bezier Surface Reformationmentioning

confidence: 99%

Brachial Plexus Injury: Clinical Manifestations, Conventional Imaging Findings, and the Latest Imaging Techniques

Yoshikawa¹,

Hayashi²,

Yamamoto³

et al. 2006

RadioGraphics

Self Cite

175

132

View full text Add to dashboard Cite

Brachial plexus injury (BPI) is a severe neurologic injury that causes functional impairment of the affected upper limb. Imaging studies play an essential role in differentiating between preganglionic and postganglionic injuries, a distinction that is crucial for optimal treatment planning. Findings at standard myelography, computed tomographic (CT) myelography, and conventional magnetic resonance (MR) imaging help determine the location and severity of injuries. MR imaging sometimes demonstrates signal intensity changes in the spinal cord, and enhancement of nerve roots and paraspinal muscles at MR imaging indicates the presence of root avulsion injuries. New techniques including MR myelography, diffusion-weighted neurography, and Bezier surface reformation can also be useful in the evaluation and management of BPI. MR myelography with state-of-the-art technology yields remarkably high-quality images, although it cannot replace CT myelography entirely. Diffusion-weighted neurography is a cutting-edge technique for visualizing postganglionic nerve roots. Bezier surface reformation allows the depiction of entire intradural nerve roots on a single image. CT myelography appears to be the preferred initial imaging modality, with standard myelography and contrast material-enhanced MR imaging being recommended as additional studies. Work-up will vary depending on the equipment used, the management policy of peripheral nerve surgeons, and, most important, the individual patient.

show abstract

Section: Radiographics Bezier Surface Reformationmentioning

confidence: 99%

Brachial Plexus Injury: Clinical Manifestations, Conventional Imaging Findings, and the Latest Imaging Techniques

Yoshikawa¹,

Hayashi²,

Yamamoto³

et al. 2006

RadioGraphics

Self Cite

175

132

View full text Add to dashboard Cite

show abstract

“…As CT-M is invasive and means exposing these, often young, patients to high doses of ionising radiation, this type of imaging should also be reserved to patients with contraindication to MRI. A new modality that recently showed high feasibility in the assessment of cervical nerve roots is Bezier surface technique, which enables reformatting volumetric data obtained at CT-myelography to depict the individual nerve root in a single image [11,12]. However, most of these modalities are new and their role in the work-up of brachial plexus injury is not yet well established.…”

Section: Introductionmentioning

confidence: 99%

Advanced radiological work-up as an adjunct to decision in early reconstructive surgery in brachial plexus injuries

Abul-Kasim

Backman

Björkman

et al. 2014

J Brachial Plex Peripher Nerve Inj

View full text Add to dashboard Cite

BackgroundAs neurophysiologic tests may not reveal the extent of brachial plexus injury at the early stage, the role of early radiological work-up has become increasingly important. The aim of the study was to evaluate the concordance between the radiological and clinical findings with the intraoperative findings in adult patients with brachial plexus injuries.MethodsSeven consecutive male patients (median age 33; range 15-61) with brachial plexus injuries, caused by motor cycle accidents in 5/7 patients, who underwent extensive radiological work-up with magnetic resonance imaging (MRI), computed tomography myelography (CT-M) or both were included in this retrospective study. A total of 34 spinal nerve roots were evaluated by neuroradiologists at two different occasions. The degree of agreement between the radiological findings of every individual nerve root and the intraoperative findings was estimated by calculation of kappa coefficient (К-value). Using the operative findings as a gold standard, the accuracy, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of the clinical findings and the radiological findings were estimated.ResultsThe diagnostic accuracy of radiological findings was 88% compared with 65% for the clinical findings. The concordance between the radiological findings and the intraoperative findings was substantial (К = 0.76) compared with only fair (К = 0.34) for the clinical findings. There were two false positive and two false negative radiological findings (sensitivity and PPV of 0.90; specificity and NPV of 0.87).ConclusionsThe advanced optimized radiological work-up used showed high reliability and substantial agreement with the intraoperative findings in adult patients with brachial plexus injury.

show abstract

Magnetic resonance imaging in brachial plexus injury

Caranci¹,

Briganti²,

Porta³

et al. 2013

Musculoskelet Surg

View full text Add to dashboard Cite

Brachial plexus injury represents the most severe nerve injury of the extremities. While obstetric brachial plexus injury has showed a reduction in the number of cases due to the improvements in obstetric care, brachial plexus injury in the adult is an increasingly common clinical problem. The therapeutic measures depend on the pathologic condition and the location of the injury: Preganglionic avulsions are usually not amenable to surgical repair; function of some denervated muscles can be restored with nerve transfers from intercostals or accessory nerves and contralateral C7 transfer. Postganglionic avulsions are repaired with excision of the damaged segment and nerve autograft between nerve ends or followed up conservatively. Magnetic resonance imaging is the modality of choice for depicting the anatomy and pathology of the brachial plexus: It demonstrates the location of the nerve damage (crucial for optimal treatment planning), depicts the nerve continuity (with or without neuroma formation), or may show a completely disrupted/avulsed nerve, thereby aiding in nerve-injury grading for preoperative planning. Computed tomography myelography has the advantage of a higher spatial resolution in demonstration of nerve roots compared with MR myelography; however, it is invasive and shows some difficulties in the depiction of some pseudomeningoceles with little or no communication with the dural sac.

show abstract

Bezier surface reformation: an original visualization technique of cervical nerve roots on myelographic CT

Abstract: The BSR technique of cervical myelographic CT enables simultaneous display of multiple cervical nerve roots in one image. BSR is a feasible technique for the assessment of the cervical nerve roots.

Cited by 6 publications

References 7 publications

Brachial Plexus Injury: Clinical Manifestations, Conventional Imaging Findings, and the Latest Imaging Techniques

Brachial Plexus Injury: Clinical Manifestations, Conventional Imaging Findings, and the Latest Imaging Techniques

Advanced radiological work-up as an adjunct to decision in early reconstructive surgery in brachial plexus injuries

Magnetic resonance imaging in brachial plexus injury

Contact Info

Product

Resources

About