scholarly journals High-Resolution 3D-Constructive Interference in Steady-State MR Imaging and 3D Time-of-Flight MR Angiography in Neurovascular Compression: A Comparison between 3T and 1.5T

2012 ◽  
Vol 33 (7) ◽  
pp. 1251-1256 ◽  
Author(s):  
M. Garcia ◽  
R. Naraghi ◽  
T. Zumbrunn ◽  
J. Rösch ◽  
P. Hastreiter ◽  
...  
Keyword(s):  
Steady State ◽  
High Resolution ◽  
Mr Imaging ◽  
Mr Angiography ◽  
Time Of Flight ◽  
Neurovascular Compression ◽  
Constructive Interference

scholarly journals Esophageal carcinoma: Evaluation with high-resolution three-dimensional constructive interference in steady state MR imaging in vitro

2006 ◽  
Vol 24 (6) ◽  
pp. 1326-1332 ◽  
Author(s):  
Ichiro Yamada ◽  
Yosuke Izumi ◽  
Tatsuyuki Kawano ◽  
Norio Yoshino ◽  
Akemi Tetsumura ◽  
...  
Keyword(s):  
Steady State ◽  
High Resolution ◽  
Mr Imaging ◽  
Esophageal Carcinoma ◽  
Three Dimensional ◽  
Constructive Interference

Preoperative single-slab 3D time-of-flight magnetic resonance angiography predicts development of new cerebral ischemic events after carotid endarterectomy

2009 ◽  
Vol 111 (1) ◽  
pp. 141-146 ◽  
Author(s):  
Taro Suzuki ◽  
Kuniaki Ogasawara ◽  
Ryonoshin Hirooka ◽  
Makoto Sasaki ◽  
Masakazu Kobayashi ◽  
...  
Keyword(s):  
At Risk ◽  
Mr Imaging ◽  
Carotid Endarterectomy ◽  
Signal Intensity ◽  
Mr Angiography ◽  
Time Of Flight ◽  
Neurological Deficits ◽  
Patients At Risk ◽  
Cerebral Ischemic ◽  
Ischemic Events

Object Preoperative impairment of cerebral hemodynamics predicts the development of new cerebral ischemic events after carotid endarterectomy (CEA), including neurological deficits and cerebral ischemic lesions on diffusion weighted MR imaging. Furthermore, the signal intensity of the middle cerebral artery (MCA) on single-slab 3D time-of-flight MR angiography (MRA) can assess hemodynamic impairment in the cerebral hemisphere. The purpose of the present study was to determine whether, on preoperative MR angiography, the signal intensity of the MCA can be used to identify patients at risk for development of cerebral ischemic events after CEA. Methods The signal intensity of the MCA ipsilateral to CEA on preoperative MR angiography was graded according to the ability to visualize the MCA in 106 patients with unilateral internal carotid artery stenosis (≥ 70%). Diffusion weighted MR imaging was performed within 3 days of and 24 hours after surgery. The presence or absence of new postoperative neurological deficits was also evaluated. Results Cerebral ischemic events after CEA were observed in 16 patients. Reduced signal intensity of the MCA on preoperative MR angiography was the only significant independent predictor of postoperative cerebral ischemic events. When the reduced MCA signal intensity on preoperative MR angiography was defined as an impairment in cerebral hemodynamics, MR angiography grading resulted in an 88% sensitivity and 63% specificity, with a 30% positive- and a 97% negative-predictive value for the development of postoperative cerebral ischemic events. Conclusions Signal intensity of the MCA on preoperative single-slab 3D time-of-flight MR angiography is useful for identifying patients at risk for cerebral ischemic events after CEA.

Holocord Hydrosyringomyelia with Terminal Myelocystocele Revealed by Constructive Interference in Steady-State MR Imaging

2008 ◽  
Vol 44 (6) ◽  
pp. 509-512 ◽  
Author(s):  
Kimiaki Hashiguchi ◽  
Takato Morioka ◽  
Kazuhiro Samura ◽  
Fumiaki Yoshida ◽  
Yasushi Miyagi ◽  
...  
Keyword(s):  
Steady State ◽  
Mr Imaging ◽  
Constructive Interference ◽  
Terminal Myelocystocele

High resolution time-of-flight MR-angiography at 7 T exploiting VERSE saturation, compressed sensing and segmentation

2019 ◽  
Vol 63 ◽  
pp. 193-204 ◽  
Author(s):  
Christian R. Meixner ◽  
Patrick Liebig ◽  
Peter Speier ◽  
Christoph Forman ◽  
Bernhard Hensel ◽  
...  
Keyword(s):  
High Resolution ◽  
Compressed Sensing ◽  
Mr Angiography ◽  
Time Of Flight ◽  
Resolution Time

Preoperative magnetic resonance imaging in Type 2 trigeminal neuralgia

2010 ◽  
Vol 113 (3) ◽  
pp. 511-515 ◽  
Author(s):  
Andrew C. Zacest ◽  
Stephen T. Magill ◽  
Jonathan Miller ◽  
Kim J. Burchiel
Keyword(s):  
High Resolution ◽  
Mr Imaging ◽  
Facial Pain ◽  
Neurovascular Compression ◽  
Imaging Reconstruction ◽  
Group A ◽  
Group B ◽  
3D Mr Imaging

Object Trigeminal neuralgia (TN) is a neuropathic pain syndrome that is often associated with neurovascular compression of the trigeminal nerve and may be effectively treated with microvascular decompression (MVD). The authors used high-resolution MR imaging with 3D reconstruction in patients with constant facial pain (Type 2 TN) to determine the presence/absence of neurovascular compression and thus a potential MVD benefit. They retrospectively contacted patients to evaluate outcome. Methods All patients who reported spontaneous onset of constant facial pain (Type 2 TN), which occurred at least 50% of the time, who had undergone high-resolution 3-T MR imaging with 3D reconstruction were retrospectively selected for this study. Clinical history, facial pain questionnaire data, physical examination findings, and results from 3-T 3D MR imaging reconstruction were recorded for all patients. Intraoperative findings and clinical pain outcome were recorded for all patients who underwent MVD. Results Data obtained in 27 patients were assessed. On the basis of history and 3D MR imaging reconstruction findings, 13 patients were selected for MVD (Group A) and 14 underwent conservative treatment (Group B). Typical or suspected artery- or vein-induced neurovascular compression was predicted preoperatively in 100% of Group A patients and in 0% of Group B patients. At the time of MVD, definitive neurovascular compression was confirmed in 11 (84.6%) of 13 Group A patients. Following MVD, facial pain was completely relieved in 3 (23%), improved in 7 (53.8%), and no better in 3 (23%) of 13 Group A patients. A history of episodic (Type 1 TN) pain at any time was reported in 100 and 50% of Group A and Group B patients, respectively. A Type 1 TN pain component was reportedly improved/relieved in all Group A patients, but the Type 2 TN pain component was improved in only 7 (53.8%) of 13 patients. The mean postoperative follow-up duration was 13 months. Conclusions High-resolution 3D MR imaging reconstruction in patients with constant facial pain (Type 2 TN) can help determine the presence/absence of neurovascular compression. Surgical selection based on both clinical and radiological criteria has the potential to improve surgical outcome in patients with Type 2 TN who may potentially benefit from MVD. However, even in such selected patients, pain relief is likely to be incomplete.

Volumetric myelographic magnetic resonance imaging to localize difficult-to-find spinal dural arteriovenous fistulas

2011 ◽  
Vol 14 (3) ◽  
pp. 398-404 ◽  
Author(s):  
Jonathan M. Morris ◽  
Timothy J. Kaufmann ◽  
Norbert G. Campeau ◽  
Harry J. Cloft ◽  
Giuseppe Lanzino
Keyword(s):  
Magnetic Resonance Imaging ◽  
Steady State ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Mr Angiography ◽  
Three Dimensional ◽  
Resonance Imaging ◽  
Arteriovenous Fistulas ◽  
Dural Arteriovenous Fistulas ◽  
Spinal Dural Arteriovenous Fistulas

Although more prevalent in males in the 6th and 7th decade of life, spinal dural arteriovenous fistulas (SDAVFs) are an uncommon cause of progressive myelopathy. Magnetic resonance imaging and more recently Gd bolus MR angiography have been used to diagnose, radiographically define, and preprocedurally localize the contributing lumbar artery. Three-dimensional myelographic MR imaging sequences have recently been developed for anatomical evaluation of the spinal canal. The authors describe 3 recent cases in which volumetric myelographic MR imaging with a 3D phase-cycled fast imaging employing steady state acquisition (PC-FIESTA) and a 3D constructive interference steady state (CISS) technique were particularly useful not only for documenting an SDAVF, but also for providing localization when CT angiography, MR imaging, MR angiography, and spinal angiography failed to localize the fistula. In a patient harboring an SDAVF at T-4, surgical exploration was performed based on the constellation of findings on the PC-FIESTA images as well as the fact that the spinal segments leading to T-4 were the only ones that the authors were unable to catheterize. In a second patient, who harbored an SDAVF at T-6, after 2 separate angiograms failed to demonstrate the fistula, careful assessment of the CISS images led the authors to focus a third angiogram on the left T-6 intercostal artery and to perform superselective microcatheterization. In a third patient with an SDAVF originating from the lateral sacral branch, the PC-FIESTA sequence demonstrated the arterialized vein extending into the S-1 foramen, leading to a second angiogram and superselective internal iliac injections. The authors concluded that myelographic MR imaging sequences can be useful not only as an aid to diagnosis but also for localization of an SDAVF in complex cases.

Three-dimensional constructive interference in steady-state magnetic resonance imaging in syringomyelia: advantages over conventional imaging

2008 ◽  
Vol 8 (5) ◽  
pp. 429-435 ◽  
Author(s):  
Florian Roser ◽  
Florian H. Ebner ◽  
Søren Danz ◽  
Felix Riether ◽  
Rainer Ritz ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Steady State ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Preoperative Evaluation ◽  
Motion Artifacts ◽  
Csf Flow ◽  
Constructive Interference ◽  
Detection Rates ◽  
Mr Sequences

Object Neuroradiology has become indispensable in detecting the pathophysiology in syringomyelia. Constructive interference in steady-state (CISS) magnetic resonance (MR) imaging can provide superior contrast at the sub-arachnoid tissue borders. As this region is critical in preoperative evaluation, the authors hypothesized that CISS imaging would provide superior assessment of syrinx pathology and surgical planning. Methods Based on records collected from a database of 130 patients with syringomyelia treated at the authors' institution, 59 patients were prospectively evaluated with complete neuroradiological examinations. In addition to routine acquisitions with FLAIR, T1- and T2-weighted, and contrast-enhanced MR imaging series, the authors obtained sagittal cardiac-gated sequences to visualize cerebrospinal fluid (CSF) pulsations and axial 3D CISS MR sequences to detect focal arachnoid webs. Statistical qualitative and quantitative evaluations of spinal cord/CSF contrast, spinal cord/CSF delineation, motion artifacts, and artifacts induced by pulsatile CSF flow were performed. Results The 3D CISS MR sequences demonstrated a contrast-to-noise ratio significantly better than any other routine imaging sequence (p < 0.001). Moreover, 3D CISS imaging can detect more subarachnoid webs and cavitations in the syrinx than T2-weighted MR imaging with less flow-void artifact. The limitation of 3D CISS imaging is a susceptibility to motion artifacts that can cause reduced spatial resolution. Lengthy acquisition times for axial segments can be reduced with multiplanar reconstruction of 3D CISS–generated sagittal images. Conclusions Constructive interference in steady-state imaging is the MR sequence of choice in the preoperative evaluation of syringomyelia, allowing significantly higher detection rates of focal subarachnoid webs, whereas standard T2-weighted MR imaging shows turbulent CSF flow voids. Constructive interference in steady-state MR imaging enables the neurosurgeon to accurately identify cases requiring decompression for obstructed CSF. Motion artifacts can be eliminated with technical variations.

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