No abstract

The main contribution of this paper is to develop a method for alleviating fatigue during handling medium-weight objects and augmenting our endurance by affecting our weight perception with augmented reality technology. To assist people to lift medium-weight objects without a complex structure or various costs, we focus on the phenomenon that our weight perception during handling objects is affected by visual properties. Our hypothesis is that this illusionary effect in weight perception can be applied to reduce fatigue while handling medium-weight objects without mechatronics-based physical assistance.In this paper, we propose an augmented reality system that changes the brightness value of an object in order to reduce fatigue while handling the object. We conducted two fundamental experiments to investigate the effectiveness of the proposed system. Our results suggested that the system eliminates the need to use excess energy for handling objects and reduces fatigue during the handling task.

We report three cases in which endovascular treatment (EVT) was performed for anterior circulation large vessel occlusion (LVO) beyond 24 h from the onset of stroke. Case 1 experienced left hemispatial neglect and gait disorder due to right internal cerebral artery (ICA) occlusion and underlying atherosclerosis. After percutaneous transluminal angioplasty (PTA), revascularization with mild stenosis was achieved. Case 2 complained of reduced activity, motor aphasia, and right-sided hemiparesis due to left middle cerebral artery occlusion. After thrombectomy using a retrieval stent, revascularization with M1 stenosis and distal perfusion delay was observed, which improved after PTA. Case 3 arrived at our hospital 30 h after the onset of dysarthria and gait disturbance due to left ICA occlusion. Since the symptoms were mild, medical treatment was started; however, the patient's symptoms deteriorated 6 h later, and EVT was required. After thrombectomy using a retrieval stent, revascularization was achieved. LVO pathophysiology beyond 24 h of stroke onset varies and may require multimodal treatment. Preserving the pyramidal tract may lead to favorable outcomes, even in cases of anterior circulation LVO. EVT may be effective for anterior circulation LVO because, in some patients, infarct volume continues to increase >24 h after stroke onset.

This paper propose and evaluate the Reliving Past Scene Experience system using augmented reality technology. This system overlays past scenes in video materials onto the real environment and makes users to experience how the camera operator captured the scene by inducing them to move as in the same way as the operator. By inducing users to move in the same way as the camera operator unconsciously, the system make them feel as if they look around in the past scene on their own will. For this purpose we proposed three induction techniques: induction for preventing unintentional movements, starting to move and appropriate rotation. We implemented these in a system which relives videos of old railways and exhibited it at THE RAILWAY MUSEUM for two weeks. Results of analyzing users' operational log and questionnaires suggest that proposed system and interaction techniques are effective to relive past scene experiences in real environment.

Background: Spinal cord infarction is a rare but serious complication of neurointervention that has been rarely documented. An association between spinal cord infarction and the placement of large bore catheters in the vertebral artery (VA) has been mentioned, but the precise etiology remains unclear. Case Description: A 72-year-old female presented with the right hemiparesis and left thermal hypoalgesia directly after endovascular coil embolization for an unruptured basilar tip aneurysm. Magnetic resonance imaging demonstrated right-sided upper cervical (C2-3) spinal cord infarction. Conventional bilateral vertebral angiograms revealed no opacification of the anterior spinal arteries. Cone-beam computed tomography showed a watershed area of radiculomedullary arteries that was correlated with the extent of the ischemic lesion. Thus, the spinal cord ischemia may have had multifactorial causes combined with reduced perfusion pressure to the spinal cord, which was caused by the placement of the guiding catheter in the VA and intensive hypotension during general anesthesia. Conclusion: Spinal cord infarction should be recognized as a serious complication of endovascular treatment involving posterior circulation.