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Arterial Spin-Labeling Magnetic Resonance Imaging After Revascularization of Moyamoya Disease
Arterial spin labeling (ASL) magnetic resonance imaging (MRI) is a technique for depicting cerebral perfusion without contrast medium. The purpose of this study was to determine whether ASL can be used to detect hyperperfusion after revascularization for moyamoya disease as effectively as N-isopropyl-[123I]β-iodoamphetamine (123I-IMP) single-photon emission computed tomography (SPECT). Fifteen consecutive patients with moyamoya disease were included in the study. All patients underwent surgical revascularization. Postoperatively, regional cerebral blood flow (rCBF) was measured by flow-sensitive alternating inversion reco...
Source: Journal of Stroke and Cerebrovascular Diseases - June 21, 2012 Category: Neurology Authors: Toshiya Sugino, Takeshi Mikami, Kei Miyata, Kengo Suzuki, Kiyohiro Houkin, Nobuhiro Mikuni Tags: Original Articles Source Type: research

Penumbral Imaging by Using Perfusion Computed Tomography and Perfusion-Weighted Magnetic Resonance Imaging: Current Concepts
Perfusion computed tomography and perfusion-weighted magnetic resonance imaging are used to evaluate the extent of the area with ischemic penumbra; however, different parameters, algorithms, and software packages show significant discrepancies in the size of perfusion abnormalities, which should be minimized. Recently, cross-validation studies were performed using digital phantoms and have elucidated the precision and reliability of various penumbral imaging techniques. These research initiatives can promote further multicenter trials on recanalization therapies by providing accurate inclusion/exclusion criteria for approp...
Source: Journal of Stroke and Cerebrovascular Diseases - November 14, 2012 Category: Neurology Authors: Makoto Sasaki, Kohsuke Kudo, Soren Christensen, Fumio Yamashita, Jonathan Goodwin, Satomi Higuchi, Akira Ogawa Tags: Review Articles Source Type: research

123I-IMP-SPECT in a Patient with Cerebral Proliferative Angiopathy: A Case Report
We describe cerebral perfusion abnormalities in a patient with CPA by using N-isopropyl-p-[123I] iodoamphetamine single-photon emission computed tomography (123I-IMP-SPECT) and perfusion-weighted magnetic resonance imaging. The patient, a 13-year-old boy, had reversible focal neurological deficits unrelated to cerebral hemorrhage. 123I-IMP-SPECT at resting state showed preserved uptake within the vascular lesion, yet lower uptake in the area adjacent to the lesion. In addition, acetazolamide-stressed 123I-IMP-SPECT exhibited severely impaired cerebrovascular reactivity over the affected hemisphere, suggesting that his foca...
Source: Journal of Stroke and Cerebrovascular Diseases - July 8, 2013 Category: Neurology Authors: Tomomi Kimiwada, Toshiaki Hayashi, Reizo Shirane, Teiji Tominaga Tags: Case Reports Source Type: research

Cerebral Blood Flow and Oxygen Metabolism Measurements Using Positron Emission Tomography on the First Day after Carotid Artery Stenting
Conclusions: CAS increases cerebral perfusion and improves hemodynamic compromise in patients with symptomatic ICA stenosis. Although we could not clarify the usefulness of PET before and on the first day after CAS in predicting HPS, a high preoperative OEF is related to postoperative marked CBF increase and might be used as a predictor of HPS. Patients with greater hemodynamic compromise with a high preoperative OEF should be managed carefully to prevent HPS, but they have a greater chance of CBF increase after CAS.
Source: Journal of Stroke and Cerebrovascular Diseases - October 11, 2013 Category: Neurology Authors: Nobuyuki Kawai, Tetsuhiro Hatakeyama, Masanobu Okauchi, Masahiko Kawanishi, Atsushi Shindo, Nobuyuki Kudomi, Yuka Yamamoto, Yoshihiro Nishiyama, Takashi Tamiya Tags: Original Articles Source Type: research

Retrosplenial Amnesia without Topographic Disorientation Caused by a Lesion in the Nondominant Hemisphere
We report the case of a 68-year-old right-handed man who was admitted to our hospital because of sudden onset of headache. On admission, he presented with left homonymous hemianopsia, disorientation, and recent memory disturbance; however, he had normal remote memory and digit span. He was able to recall the room layout of his house and describe the route from the nearest station to his home on a map. However, at the hospital, he sometimes lost his way because of amnesia. Computed tomography (CT) and magnetic resonance imaging revealed a subcortical hematoma in the right occipital forceps and the parietal lobe, involving t...
Source: Journal of Stroke and Cerebrovascular Diseases - April 22, 2013 Category: Neurology Authors: Shinichiro Maeshima, Aiko Osawa, Fumitaka Yamane, Tomoyuki Yoshihara, Ryuzaburo Kanazawa, Shoichiro Ishihara Tags: Original Articles Source Type: research

Cerebral Perfusion Change of Venous Hypertension on Near-Infrared Spectroscopy Signals after Operation for Dural Arteriovenous Fistula
We report 1 case of dural AVF with retrograde leptomeningeal venous drainage. Cerebral hemodynamics were monitored using near-infrared spectroscopy imaging before, during, and after the 2-stage operative treatment. Preoperative functional near-infrared spectroscopy (fNIRS) showed an increase in deoxyhemoglobin (HbR) during a motor task. After partial coil embolization of the shunt points (stage 1), HbR increased during the first half of the task and decreased later, whereas oxyhemoglobin (HbO2) decreased in the first half of the task and increased later. After complete embolization (stage 2), fNIRS showed a pattern similar...
Source: Journal of Stroke and Cerebrovascular Diseases - August 19, 2013 Category: Neurology Authors: Satoka Shidoh, Takenori Akiyama, Takayuki Ohira, Kazunari Yoshida Tags: Original Articles Source Type: research

Neurologic Improvement without Angiographic Improvement after Antithyroid Therapy in a Patient with Moyamoya Syndrome
This report is unique in the point of neurologic recovery of the moyamoya patient right after initiation of antithyroid medication without radiological improvement.
Source: Journal of Stroke and Cerebrovascular Diseases - October 10, 2013 Category: Neurology Authors: Akiko Ishigami, Kazunori Toyoda, Rieko Suzuki, Fumio Miyashita, Koji Iihara, Kazuo Minematsu Tags: Case Reports Source Type: research

Blood–Brain Barrier Breakdown in Reduced Uterine Perfusion Pressure: A Possible Model of Posterior Reversible Encephalopathy Syndrome
Background: Posterior reversible encephalopathy syndrome (PRES) is a clinical entity characterized by headaches, altered mental status, seizures, and visual disturbances and is associated with white matter vasogenic edema. There are no experimental models to study PRES brain changes.Methods: Twenty-eight pregnant Wistar rats were divided into 4 groups of 7: (1) pregnant-control; (2) reduced uterine perfusion pressure (RUPP); (3) invasive blood pressure (IBP); and (4) reduced uterine perfusion pressure plus invasive blood pressure (RUPP-IBP). The RUPP and RUPP-IBP groups were submitted to a reduction of uterine perfusion pr...
Source: Journal of Stroke and Cerebrovascular Diseases - August 11, 2014 Category: Neurology Authors: Luiz Carlos Porcello Marrone, Giovani Gadonski, Gabriela de Oliveira Laguna, Carlos Eduardo Poli-de-Figueiredo, Bartira Ercilia Pinheiro da Costa, Maria Francisca Torres Lopes, João Pedro Farina Brunelli, Luciano Passamani Diogo, Antônio Carlos Huf Marr Tags: Original Articles Source Type: research

Comparison of Cerebral Blood Flow Data Obtained by Computed Tomography (CT) Perfusion with that Obtained by Xenon CT Using 320-Row CT
In this study, we have compared CBF ratios as well as CBF values obtained from CTP–CBF data to those obtained from XeCT–CBF data for the same patients to determine CTP–CBF parameters that can be used for interpatient comparisons.
Source: Journal of Stroke and Cerebrovascular Diseases - January 2, 2015 Category: Neurology Authors: Satoshi Takahashi, Yoshio Tanizaki, Hiroaki Kimura, Kazunori Akaji, Tadashige Kano, Kentaro Suzuki, Youhei Takayama, Takao Kanzawa, Satoka Shidoh, Masaki Nakazawa, Kazunari Yoshida, Ban Mihara Source Type: research

Nonconvulsive Partial Status Epilepticus Mimicking Recurrent Infarction Revealed by Diffusion-weighted and Arterial Spin Labeling Perfusion Magnetic Resonance Images
“Non-convulsive” partial status epilepticus (SE) is an important pathologic condition that should be differentiated from cerebral infarction. Herein, we reported 2 patients who had partial SE associated with old infarction in the right parietal lobe. Each patient had 2 episodes of left hemiparesis and hemisensory disturbance without convulsion. On diffusion-weighted magnetic resonance images (DW-MRI), a hyperintense lesion was noted in the cortex around the old infarction lesion, and recurrent infarction was suspected.
Source: Journal of Stroke and Cerebrovascular Diseases - February 24, 2015 Category: Neurology Authors: Yuka Kanazawa, Takato Morioka, Shuji Arakawa, Yoshihiko Furuta, Asako Nakanishi, Takanari Kitazono Source Type: research

Prediction of Cerebrovascular Reserve Capacity by Computed Tomography Perfusion Using 320-Row Computed Tomography
Acetazolamide loading has been the “gold standard” for evaluating cerebrovascular reserve capacity (CVRC). However, life-threatening side effects of acetazolamide have recently been reported. The aim of the study was to identify alternative methods for evaluating CVRC.
Source: Journal of Stroke and Cerebrovascular Diseases - March 25, 2015 Category: Neurology Authors: Satoshi Takahashi, Yoshio Tanizaki, Hiroaki Kimura, Kazunori Akaji, Tadashige Kano, Kentaro Suzuki, Youhei Takayama, Takao Kanzawa, Satoka Shidoh, Masaki Nakazawa, Kazunari Yoshida, Ban Mihara Source Type: research

X-ray Angiography Perfusion Analysis for the Balloon Occlusion Test of the Internal Carotid Artery
A perfusion study should be performed during the balloon occlusion test (BOT) to prevent ischemic events after therapeutic carotid occlusion. We evaluated the efficacy of X-ray angiography perfusion analysis during the BOT.
Source: Journal of Stroke and Cerebrovascular Diseases - April 11, 2015 Category: Neurology Authors: Katsunori Asai, Hirotoshi Imamura, Yohei Mineharu, Shoichi Tani, Hidemitsu Adachi, Osamu Narumi, Shinsuke Sato, Chiaki Sakai, Nobuyuki Sakai Source Type: research

Visualization of Regional Cerebral Blood Flow Dynamics during Cortical Venous Occlusion using Laser Speckle Contrast Imaging in a Rat Model
Cerebral venous ischemia (CVI) is a rare but potentially significant complication of neurosurgical procedures. However, it is still unclear how cerebral venous occlusion (VO) affects regional cerebral blood flow (rCBF) dynamics. To elucidate its pathophysiology in detail, we examined the real-time perfusion dynamics during adjacent vein occlusions using laser speckle contrast imaging (LSCI) in a rat 2-vein occlusion model.
Source: Journal of Stroke and Cerebrovascular Diseases - July 25, 2015 Category: Neurology Authors: Yasuhiro Takeshima, Hitoshi Miyake, Ichiro Nakagawa, Yasushi Motoyama, Young-Su Park, Hiroyuki Nakase Source Type: research

Arterial Spin Labeling Perfusion Magnetic Resonance Image with Dual Postlabeling Delay: A Correlative Study with Acetazolamide Loading I-Iodoamphetamine Single-Photon Emission Computed Tomography
Perfusion magnetic resonance image with arterial spin labeling (ASL) provides a completely noninvasive measurement of cerebral blood flow (CBF). However, arterial transient times can have a marked effect on the ASL signal. For example, a single postlabeling delay (PLD) of 1.5 seconds underestimates the slowly streaming collateral pathways that maintain the cerebrovascular reserve (CVR). To overcome this limitation, we developed a dual PLD method.
Source: Journal of Stroke and Cerebrovascular Diseases - September 16, 2015 Category: Neurology Authors: Sei Haga, Takato Morioka, Takafumi Shimogawa, Tomoaki Akiyama, Kei Murao, Yuka Kanazawa, Tetsuro Sayama, Shuji Arakawa Source Type: research

Epileptic Ictal Hyperperfusion on Arterial Spin Labeling Perfusion and Diffusion-Weighted Magnetic Resonance Images in Posterior Reversible Encephalopathy Syndrome
The hemodynamic state of the posterior dominant vasogenic edema in posterior reversible encephalopathy syndrome (PRES) is controversial. The aim of this retrospective study was to examine the contribution of epileptic ictal hyperperfusion in patients with PRES using combined magnetic resonance perfusion imaging with arterial spin labeling (ASL) and diffusion-weighted magnetic resonance imaging (MRI).
Source: Journal of Stroke and Cerebrovascular Diseases - October 27, 2015 Category: Neurology Authors: Kayo Wakisaka, Takato Morioka, Takafumi Shimogawa, Kei Murao, Yuka Kanazawa, Noriko Hagiwara, Shuji Arakawa Source Type: research

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