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Treatment of moving targets with scanned particle beams results in local over- and under-dosage due to interplay of beam and target motion. To mitigate the impact of respiratory motion, a motion tracking system has been developed and integrated in the therapy control system at Gesellschaft für Schwerionenforschung. The system adapts pencil beam positions as(More)
PURPOSE The use of motion mitigation techniques such as tracking and gating in particle therapy requires real-time knowledge of tumor position with millimeter precision. The aim of this phantom-based study was to evaluate the option of diagnostic ultrasound (US) imaging (sonography) as real-time motion detection method for scanned heavy ion beam irradiation(More)
The technical performance of an integrated three-dimensional carbon ion pencil beam tracking system that was developed at GSI was investigated in phantom studies. Aim of the beam tracking system is to accurately treat tumours that are subject to respiratory motion with scanned ion beams. The current system provides real-time control of ion pencil beams to(More)
PURPOSE To demonstrate mitigation of the interplay effects of scanned particle beams and residual target motion within a gating window by increased overlap of pencil beams. METHODS AND MATERIALS Lateral overlap was increased by increasing the pencil beam widths or by decreasing the distance between the pencil beams (scan grid). Longitudinal overlap was(More)
 Calcification in vestibular schwannoma is extremely rare. A 36-year-old man presented with a history of decreased hearing on the left since childhood. Computed tomography showed a left cerebellopontine angle lesion protruding into the porus acousticus and enlarging the internal auditory meatus, with significant deposits of calcification. Histological and(More)
We determine the polarized gluon distribution ∆g(x) by a global analysis using current DIS and π0 asymmetry data. The π0 data from RHIC-Spin experiments provide a strong constraint on ∆g(x), so that its uncertainty is reduced. However, a sign problem appears in the analysis using π0 data, which means that positive and negative distributions are allowed for(More)
Incidence of von Hippel-Lindau disease among hemangioblastomas is important clinical information affecting the management of hemangioblastomas. Studies from Western countries reported 36–40% for the incidence, but no report has been made on the Japanese population. To investigate the incidence in Japan, we retrospectively analyzed all hemangioblastoma(More)
Snapping syndrome rarely occurs at the knee joint. This is the first report of snapping pes syndrome after total knee arthroplasty. Surgeons should be aware of the presence of such a case and pay attention to the fact that snapping symptoms could be caused by a residual bony prominence and a change in alignment after total knee arthroplasty. Level of(More)
Two cases of primary choroid plexus papilloma originating in the cerebellopontine angle (CPA) are reported. Both papillomas were encapsulated and strongly adhering to a choroid plexus tuft protruding from the foramen of Luschka. Successful removal of the tumour was achieved in each case. Surgical strategy, neuroradiological manifestations, and the(More)
¶ A rare case of a ruptured internal carotid artery (ICA) aneurysm, with ICA stenosis and moyamoya vessels, was diagnosed in a young female patient after radiotherapy for optic glioma. Retrospective analysis revealed that an extraordinarily high dose of radiation (110 Gy) had been delivered to the area around the ICA in two therapeutic sessions. Clipping(More)