Topological effects of the superconducting vortex state in a TaSe3 ring crystal : Observation of magnetic torque oscillations

We measured the magnetic torque of the ring-shaped crystals of TaSe3 by using piezoresistive cantilevers to investigate the superconducting topological properties. We measured three ring samples and we observed that the magnetic torque of the ring crystals oscillates with increasing external magnetic field. The magnetic periods of Sample A (radius: 37.9 μm), Sample B (24.5 μm), and Sample C (15.6 μm) were 2.16 ± 6.6 x 10^[-2] G, 4.69 ± 1.8 x 10^[-1] G, and 5.44 ± 3.8 x 10^[-1] G, respectively. We found that hundreds of vortices collectively and simultaneously penetrated the ring crystal. When such a phenomenon occurs, it is natural that the vortices in the ring crystal would be positioned along the circumference. From these results, we suggest that vortices exist as cylinder vortices in the rings, and this phenomenon provides unambiguous experimental evidence of the topological effect in a superconductor

An unusually large osteochondroma of the mandibular angle: a case report

Abstract Background Osteochondroma is a benign bone tumor that can occur in both the mesenchymal and craniofacial bones. However, craniofacial osteochondromas are extremely rare, because the mandible develops by intramembranous ossification rather than by endochondral ossification. Case presentation The most common site of craniofacial osteochondroma is the mandibular condyle, followed by the coronoid process. In the present study, we have described the case of a 64-year-old Japanese man with an unusually large osteochondroma located on the internal angle of the mandibular body. Clinical, radiological, pathological, and treatment-related aspects are discussed with respect to the tumor origins. Conclusions In the medical literature, there have been few reports of large osteochondromas of the mandibular angle with no clinical symptoms

A comprehensive study on electrically floating PET insert for efficient RF penetrability at 3 T MRI system

A comprehensive experimental study has been conducted on the geometrical aspects of electrically floating radio frequency (RF) penetrable PET inserts to improve the RF penetration efficiency for acceptable MR imaging performance. Several one ring and two ring PET insert prototypes were used to do experiments in a 700-mm bore diameter 3 T clinical MRI system with a homogeneous cylindrical phantom. Study results provide guidance for optimized PET ring design for efficient RF field penetration inside the shielded ring.ISMRM 2018 Annual Meetin

Geometry optimization of electrically floating PET inserts for improved RF

添付の通

A case of adult-onset xanthogranuloma of the tongue

Xanthogranuloma is a granulomatous lesion associated with histiocytic proliferation and lipid accumulation. It occurs as solitary or multiple smooth-surfaced papules or nodules. It generally appears on the skin in infancy and childhood, in which case it is known as juvenile xanthogranuloma, although a few adult-onset cases have also been reported. Adult-onset cases are known as adult-onset xanthogranuloma, and adult-onset xanthogranuloma of the tongue is extremely rare. The disease is difficult to diagnose clinically; it is instead diagnosed histopathologically in most cases. We herein report a case of adult-onset xanthogranuloma of the tongue

Clinical Diagnostic Imaging Study of Osteoradionecrosis of the Jaw: A Retrospective Study

Radiation therapy (RT) plays a significant role in the management of head and neck malignancies. This study aimed to review the clinical symptoms and various imaging findings of osteoradionecrosis (ORN) and provide a clinical perspective on the development of ORN. The retrospective cohort was composed of 57 sites in 54 patients who had a history of RT and suspected ORN and 48 sites in 45 patients who were confirmed to have ORN. Image analyses included computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET)/CT, bone scintigraphy, and single-photon emission CT (SPECT). The irradiated tissue was damaged by RT, and the extent of damage was correlated with clinical symptoms. The bone marrow showed sclerotic changes and the devitalized bone showed bone resorption after invasive stimulation. Chronic trismus and pathological fracture are considered severe conditions, typically occurring in the last stage of ORN. Furthermore, neurological symptoms were an important sign of tumor recurrence, since diagnostic imaging was difficult. The possible treatment options vary depending on the stage of ORN. We speculate that bone sclerosis reactions and bone resorption are sequential reactions that seem to be protective measures of the bone to radiation injury