scholarly journals Magnetic resonance angiography and perfusion mapping by arterial spin labeling using Fourier transform–based velocity‐selective pulse trains: Examination on a commercial perfusion phantom

2021 ◽  
Author(s):  
Feng Xu ◽  
Dan Zhu ◽  
Hongli Fan ◽  
Hanzhang Lu ◽  
Dapeng Liu ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Arterial Spin Labeling ◽  
Spin Labeling ◽  
Pulse Trains ◽  
Selective Pulse

Vessel segmentation in 4D arterial spin labeling magnetic resonance angiography images of the brain

2017 ◽  
Author(s):  
Renzo Phellan ◽  
Thomas Lindner ◽  
Alexandre X. Falcão ◽  
Nils D. Forkert
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Arterial Spin Labeling ◽  
Spin Labeling ◽  
Vessel Segmentation ◽  
The Brain

scholarly journals Vessel-encoded dynamic magnetic resonance angiography using arterial spin labeling

2010 ◽  
Vol 64 (3) ◽  
pp. 698-706 ◽  
Author(s):  
Thomas W. Okell ◽  
Michael A. Chappell ◽  
Mark W. Woolrich ◽  
Matthias Günther ◽  
David A. Feinberg ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Arterial Spin Labeling ◽  
Spin Labeling ◽  
Dynamic Magnetic Resonance

Abstract WP61: A Novel Application of Four-dimensional Magnetic Resonance Angiography Using Arterial Spin Labeling for Assessment of Postoperative Cerebral Hemodynamic Changes in Moyamoya Disease

Stroke ◽  
2016 ◽  
Vol 47 (suppl_1) ◽  
Author(s):  
Haruto Uchino ◽  
Masaki Ito ◽  
Ken Kazumata ◽  
Kiyohiro Houkin
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Moyamoya Disease ◽  
Arterial Spin Labeling ◽  
Early Time ◽  
Spin Labeling ◽  
Postoperative Management ◽  
Cerebral Hemodynamics ◽  
Hemodynamic Changes ◽  
Tof Mra

Introduction: Recently, four-dimensional magnetic resonance angiography without contrast enhancement using arterial spin labeling (ASL-4D MRA) has become available to visualize the intracranial arteries. However, few reports are available about the efficacy of ASL-4D MRA in moyamoya disease (MMD). Hypothesis: We hypothesized that postoperative hemodynamic changes in MMD patients could be evaluated using ASL-4D MRA. Methods: This study included 26 hemispheres of 21 patients who underwent combined direct and indirect revascularization for MMD. ASL-4D MRA was serially performed before and after surgery. We assessed the time phases where signals of the arteries were detected on ASL-4D MRA in order to analyze perioperative changes in cerebral hemodynamics. Results: The signals of the anastomosed arteries on ASL-4D MRA were detected and disappeared at significantly earlier time phase after surgery than before. This change in acute period was moderated in chronic period after surgery. Postoperative hyperperfusion was observed in 12 of 26 hemispheres within 7 days after surgery. The signals of the arteries were detected significantly earlier in hemispheres with hyperperfusion than those without. In cases with hyperperfusion, ASL-4D MRA demonstrated high intensity of peripheral middle cerebral artery (MCA) around anastomosed region in early time phase (Figure). This “early hyperintensity of MCA” was observed in all cases with hyperperfusion and corresponded to the timing of the occurrence of hyperperfusion. Furthermore, this hyperperfusion-specific sign could not be detected by routine TOF MRA. Conclusions: Noninvasive ASL-4D MRA successfully evaluated perioperative dynamic changes of cerebral blood flow and the effect of surgical revascularization in MMD. This next generation modality could also visualize cerebral hemodynamics in cases with postoperative hyperperfusion and would be quite useful for appropriate postoperative management.

scholarly journals Arterial Spin Labeling Imaging of a Giant Aneurysm Leading to Subarachnoid Hemorrhage following Cerebral Infarction

2018 ◽  
Vol 10 (1) ◽  
pp. 66-71 ◽  
Author(s):  
Tatsuya Ueno ◽  
Tatsuya Sasaki ◽  
Masatoshi Iwamura ◽  
Tomoya Kon ◽  
Jin-ichi Nunomura ◽  
...  
Keyword(s):  
Subarachnoid Hemorrhage ◽  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Cerebral Infarction ◽  
Arterial Spin Labeling ◽  
Giant Aneurysm ◽  
Spin Labeling ◽  
Left Internal Carotid Artery ◽  
Hyperintense Signal ◽  
Aneurysm Thrombosis

An 83-year-old Japanese man was admitted with dysarthria and right hemiparesis. He had had a large intracranial aneurysm on the left internal carotid artery 5 years before admission and had been followed up under conservative treatment. On admission, diffusion-weighted imaging revealed a hyperintense signal on the left anterior choroidal artery territory. Time-of-flight magnetic resonance angiography demonstrated poor visibility of the middle and anterior cerebral arteries and the inferior giant aneurysm, suggesting distal emboli from aneurysm thrombosis or a reduction of blood outflow due to aneurysm thrombosis. Arterial spin labeling (ASL) signal increased in the giant aneurysm, suggesting blood stagnation within the aneurysmal sac, and decreased in the left hemisphere. We diagnosed cerebral infarction due to aneurysm thrombosis, and started antithrombotic therapy. On day 2, he suddenly died of subarachnoid hemorrhage due to rupturing of the giant aneurysm. When thrombosis occurs in a giant aneurysm, increasing ASL signal within the aneurysm and decreasing ASL signal with poor visibility on magnetic resonance angiography in the same arterial territory may indicate the danger of impending rupture of the giant aneurysm.

Evaluation of Intracranial Arteriovenous Malformations With Four-Dimensional Arterial-Spin Labeling–Based 3-T Magnetic Resonance Angiography

2016 ◽  
Vol 40 (2) ◽  
pp. 290-296 ◽  
Author(s):  
Yasuhiko Iryo ◽  
Toshinori Hirai ◽  
Masanobu Nakamura ◽  
Takayuki Kawano ◽  
Yasuyuki Kaku ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Arterial Spin Labeling ◽  
Arteriovenous Malformations ◽  
Spin Labeling ◽  
Intracranial Arteriovenous Malformations

scholarly journals Vessel‐encoded dynamic magnetic resonance angiography using arterial spin labeling

2010 ◽  
Vol 64 (2) ◽  
pp. 430-438 ◽  
Author(s):  
Thomas W. Okell ◽  
Michael A. Chappell ◽  
Mark W. Woolrich ◽  
Matthias Günther ◽  
David A. Feinberg ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Arterial Spin Labeling ◽  
Spin Labeling ◽  
Dynamic Magnetic Resonance
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