Masahiko Sakamoto

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The current study evaluated the signal characteristics of susceptibility weighted imaging (SWI) of arteriovenous malformation (AVM), especially for draining veins. For this purpose, we identified the draining veins of the AVM on angiography and evaluated the signal on magnitude image for SWI (SWI-mag) and minimum intensity projection image (SWI-minIP).(More)
PURPOSE To preoperatively visualize the course of the facial nerve, which is displaced by vestibular schwannoma, using diffusion tensor (DT) tractography, and to evaluate the agreement with surgical findings. MATERIALS AND METHODS The subjects were eight patients with vestibular schwannoma who had undergone removal surgery. DT MR images were obtained and(More)
RATIONALE AND OBJECTIVES The torcular herophili, or "confluence of the sinuses," shows various configurations with other venous sinuses, as revealed by angiography. The aims of this study were to evaluate anatomic variations of this confluence and to assess their clinical relevance using three-dimensional (3D) computed tomographic (CT) venography. (More)
BACKGROUND AND PURPOSE Visual defect due to optic radiation injury is a complication of temporal lobectomy for temporal epilepsy. To investigate whether diffusion tensor imaging can delineate the changes in optic radiations after lobectomy, we evaluated parameters on tensor images for optic radiations and correlated them with visual defect. METHODS We(More)
PURPOSE This study accessed the feasibility of using tractography-based analysis to evaluate the apparent diffusion coefficient (ADC) and fractional anisotropy (FA) of three cerebellar peduncles in subtypes of spinocerebellar degenerative disease. MATERIALS AND METHODS We examined 7 cases of dentatorubro-pallidoluysian atrophy (DRPLA), 4 cases of multiple(More)
BACKGROUND Retrograde leptomeningeal venous drainage (RLVD) in dural arteriovenous fistulas (DAVFs) is associated with intracerebral hemorrhage and nonhemorrhagic neurological deficits or death. Angiographic evidence of RLVD is a definite indication for treatment, but less invasive methods of identifying RLVD are required. OBJECTIVE To evaluate the(More)
Abdominal aortic aneurysm (AAA) is commonly associated with coronary artery disease (CAD). Eleven patients underwent the combined operation of coronary artery bypass grafting (CABG) on the beating heart and AAA repair: 10 underwent off pump CABG and 1 patient required centrifugal pump and pulmonary assist with closed circuit because of unstable(More)
PURPOSE This study discusses prominent signal intensity of T(1)/T(2) prolongation of subcortical white matter within the anterior temporal region in premature infant brains that radiologists may encounter when interpreting conventional screening MRIs. MATERIALS AND METHODS T(1)- and T(2)-weighted images of 69 preterm and term infants with no neurological(More)
PURPOSE The present study aimed to identify the types of curved lesions that are difficult to place Carotid Wallstent (CWS). MATERIALS AND METHODS The study targeted 31 consecutive carotid artery (CA) stenosis underwent carotid artery stenting using CWS. CWS placement success rate, stenosis location, lesion tortuosity, and relationship with stent(More)
The purpose of this study was to assess the usefulness of signs (“Sukeroku sign” and “dent internal-capsule sign”) for the recognition of subthalamic nucleus (STN). Five Parkinson’s disease cases in which there was a successful placement of deep brain stimulation (DBS) electrodes at the STN were retrospectively reviewed. Five radiologists who were not(More)