A total of 130 patients with metastatic brain tumors were treated with the Gamma Knife; 85 had multiple lesions. The marginal dose was 14-30 Gy for the initial 20 cases during the first 6 months. Thereafter, we increased the marginal dose to between 25 and 30 Gy for the last 110 cases. The follow-up period ranged from 1 to 49 months (mean 9 months). The… (More)
To evaluate the effect of radiosurgery on angiographically occult vascular malformations (AOVMs), 9 patients treated with Gamma Knife surgery were followed up for 21-37 months. Eight patients had bleeding episodes, 1 had uncontrollable epilepsy. Rebleeding occurred in 3 AOVMs 5 or 6 months after treatment. One patient experienced transient radiation-induced… (More)
We developed optical interconnect technologies, i.e., an optical mid-plane, high-density connector, and a compact transceiver for future servers that enable high-bandwidth and dense integration. Using these technologies, 1500 optical connections and 37.5 Tb/s of bandwidth were built in a blade-server form factor.
Both regional cerebral blood flow (rCBF) and regional vascular reserve (rVR) in ten childhood Moyamoya disease were quantified pre- and post-operatively by autoradiographic processing using single photon emission computed tomography (SPECT) and N-isopropyl-rho-iodoamphetamine (IMP) (IMP-ARG method) to estimate hemodynamic effectiveness of surgical… (More)
The identification of intermediate filaments within immature cells is valuable as a means to investigate neuronal and glial differentiation. The purpose of this study is to investigate the time of appearance of neuron and glia within rat embryo by identifying cell-specific intermediate filaments. Pregnant rat were daily sacrificed from day 9-20 of… (More)
An 18-year-old male admitted to our hospital suffered left temporal subcortical hemorrhage. No abnormality was demonstrated on carotid or vertebral angiography at that time. On the day following the onset, left frontotemporal craniotomy was performed and the subcortical hematoma was evacuated. No vascular malformation was found despite careful… (More)
Computed tomography-guided stereotactic aspiration has been carried out in 20 patients with hypertensive pontine hemorrhage. A Komai computed tomography-guided stereotactic apparatus and a suboccipital transcerebellar approach were used. The entire operative procedures were performed under local anesthesia or neuroleptanalgesia in the semilateral position.… (More)
We developed a new rating scale, Kohnan Vegetative Score, to measure severity and small clinical changes in vegetative state patients. It has 7 items corresponding to the conditions of vegetative state by Japanese Society of Neurosurgery: motor function, food ingestion, urination and defecation, eye movement, vocalization, communication, and facial… (More)