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Yusuke Uchinami(Yusuke Uchinami ),Koichi Yasuda(Koichi Yasuda ),Hideki Minatogawa(Hideki Minatogawa ),Yasuhiro Dekura(Yasuhiro Dekura ),Noboru Nishikawa(Noboru Nishikawa ),Rumiko Kinoshita(Rumiko Kino 대한방사선종양학회 2024 Radiation Oncology Journal Vol.42 No.1
Purpose: To investigate the clinical significance of adaptive radiotherapy (ART) in locally advanced nasopharyngeal carcinoma treated with intensity-modulated radiotherapy (IMRT). Materials and Methods: Eligible patients were treated with concurrent chemoradiotherapy using IMRT. Planning computed tomography in ART was performed during radiotherapy, and replanning was performed. Since ART was started in May 2011 (ART group), patients who were treated without ART up to April 2011 (non-ART group) were used as the historical control. The Kaplan-Meier method was used to calculate overall survival (OS), locoregional recurrence-free survival (LRFS), progression-free survival (PFS), and distant metastasis-free survival (DMFS). LRFS for the primary tumor (LRFS_P) and regional lymph node (LRFS_LN) were also studied for more detailed analysis. Statistical significance was evaluated using the log-rank test for survival. Results: The ART group tended to have higher radiation doses. The median follow-up period was 127 months (range, 10 to 211 months) in the non-ART group and 61.5 months (range, 5 to 129 months) in the ART group. Compared to the non-ART group, the ART group showed significantly higher 5-year PFS (53.8% vs. 81.3%, p = 0.015) and LRFS (61.2% vs. 85.3%, p = 0.024), but not OS (80.7% vs. 80.8%, p = 0.941) and DMFS (84.6% vs. 92.7%, p = 0.255). Five-year LRFS_P was higher in the ART group (61.3% vs. 90.6%, p = 0.005), but LRFS_LN did not show a significant difference (91.9% vs. 96.2%, p = 0.541). Conclusion: Although there were differences in the patient backgrounds between the two groups, this study suggests the potential effectiveness of ART in improving locoregional control, especially in the primary tumor.
Fabrication of 8Cr-2W ferritic steel tile for reduction in toroidal magnetic field ripple on JT-60U
yusuke Kudo,K. Masaki,M. Honda,N. Miya,R. Takahashi,S. Jitsukawa,S. Sakurai,T. Sawai,T. Sasajima,T. Hayashi,Y. Suzuki 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The objectives are to fabricate the ferritic steel for the reduction in the toroidal magnetic field ripple on JT-60U. The ferritic steel (8Cr-2W-0.2V) is selected by saturated magnetization and fabrication processes with more than 20 tons melting are reported. Although the magnetic properties of the plates fabricated are clarified, the little variation is observed but the saturated magnetization is lower than expected. Additional material conditions are clarified to improve the saturated magnetization without degradation of mechanical properties but it is decided not to adapt this process on grounds of cost-effectivenessP
Yusuke Azuma,Shuichi Onami 대한의용생체공학회 2014 Biomedical Engineering Letters (BMEL) Vol.4 No.4
In recent years, development of image processing methodshas rapidly progressed to automatically identify spatiotemporaldynamics of embryonic cells in Caenorhabditis elegans. Themethods allow quantitative and high-throughput analysis formolecular dynamics during embryogenesis. In turn, theanalyzed dynamics can be merged onto a reference embryo,providing an integrated view of embryogenesis. This integrationis enabled by invariant embryogenesis of C. elegans, whichis the most unique advantage offered by this organism. Therefore, the key point in the development of the methodsis how to take advantage of this feature. In this article, wereview a series of development of such methods and theirapplications. First, we describe basic image processing methodsthat are the basis for development of cell identificationmethods. Next, we describe methods that have succeeded toidentify cells in images and their performance. Finally, wereview studies that have employed cell identificationmethods to analyze the variability of cellular dynamics, cellcellcontacts and cell fate determination. Together withadvances in imaging technologies to measure moleculardynamics and computational methods to identify suchdynamics with high accuracy, the unique system of invariantembryogenesis in C. elegans will be invaluable to studydevelopmental mechanisms. Therefore, it is important tounderstand the ever developing technologies and theirresults.
Response of a Plate-type Thermoluminescence Dosimeter to a Therapeutic Carbon Beam
Yusuke Koba,Shigekazu Fukuda,Kiyomitsu Shinsho,Genichiro Wakabayashi,Satoshi Tamatsu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
In order to measure the three-dimensional dose distribution in X-ray radiotherapy, we developeda plate-type thermoluminescence dosimeter (TLD) using the TL phosphor Li3B7O12:Cu, which hasZeff = 7.42 and a density of 1.01 gcm−3. This detector was expected on useful application inadvanced X-ray radiotherapies such as intensity-modulated ratiation therapy (IMRT) etc., becauseit can obtain 3D dose measurements simply and quickly with a single exposure. In this paper, wereport the response of this plate-type TLD to a therapeutic carbon beam at the Heavy Ion MedicalAccelerator in Chiba (HIMAC). Using a plate heater and charge coupled device (CCD) camera, wecaptured thermoluminescence images of plate-type TLDs irradiated by a therapeutic carbon beam. The TL intensity was measured at each water equivalent depth and compared with output of theionization chamber. The relative TL efficiency of this TLD as 60Co gamma-ray equivalent decreasedgradually with increasing dose-averaged linear-energy-transfer (LET), reaching about 20% at theBragg peak of 290 MeV/u carbon ions.
Yusuke Kurebayashi,Junichi Otaki 한국간호과학회 2021 한국간호과학회 학술대회 Vol.2021 No.10
Aim(s): Schizophrenia shows social impairment that is generally treated by psychopharmacotherapy. Recently, because therapy shows efficacy only for psychopathological symptoms, physical exercise for patients with schizophrenia is under development to improve cognition based on results from several studies. However, whether physical exercise improves social functioning remains unclear. Therefore, this study analyzed the cross-sectional correlation between physical activity and social functioning in inpatients with schizophrenia. Method(s): Inpatients with schizophrenia were recruited from a psychiatric hospital in Japan. We investigated demographics, psychopathological symptoms using the Positive and Negative Syndrome Scale (PANSS), physical activity using a tri-axial accelerometer HJA-750C, and social functioning using the Life Assessment Scale for the Mentally Ill (LASMI) and the Rehabilitation Evaluation Hall and Baker (Rehab). Lower LASMI and Rehab scores indicate better function. We performed Spearman’s rank-correlation analysis. Result(s): Seven inpatients completed to the survey. The average age, illness duration, and PANSS were 47.3 ± 13.8 years, 22.9 ± 13.7 years, and 78.6 ± 17.3, respectively. Walking calories were positively associated with the deviant behavior subscale (r= .926, p= .003) and the interpersonal relationship subscale (r= .786, p= .036). Walking time were also positively associated with the deviant behavior subscale (r= .926, p= .003) and the interpersonal relationship subscale (r= .786, p= .036). walking time more than 3 Mets (r= .926, p= .003) and steps (r= .849, p= .016) were positively associated with the deviant behavior subscale. Conclusion(s): Higher walking activity is associated with lower social functioning in this cross-sectional study. This cross-sectional relationship might be influenced by participants’ symptomatic severity. Patients who have severe symptom might tend to more move or walk and show severe social dysfunction especially on deviant behavior and interpersonal relationship. Therefore, future studies should examine the longitudinal association or the effect of the intervention. Furthermore, a large-scale study is also needed.
3D‑printed thermoplastic polyurethane for wearable breast hyperthermia
Yusuke Mukai,Sixian Li,Minyoung Suh 한국의류학회 2021 Fashion and Textiles Vol.8 No.1
Microwave breast hyperthermia is a class of cancer treatment, where breast temperature is elevated by a focused electromagnetic (EM) radiation to impair cancer cells. While the current mainstream in microwave breast hyperthermia is centered on bulky and rigid systems, wearable antennas would offer considerable benefits such as superior conformity to individual patient anatomy and better comfort. In this proposition, this paper presents 3D-printed flexible antenna prototypes for wearable breast hyperthermia applications. Since the dielectric properties are expected to dominate the antenna gain but could be influenced by the solid volume percentage, this work first investigates the relationship between the dielectric properties and solid volume percentage of a 3D-printed flexible filament. From this, it is found that with decrease in the solid volume percentage, the dielectric constant decreases following the classic theory of dielectric mixture. Based on this observation, optimal antennas are designed for substrates in different infill levels by running a 3D full-wave EM simulator and fabricated by 3D printing a polyurethane filament. Temperature elevations in a synthetic breast tissue are measured by a thermometer and are ~ 5.5 °C and ~ 3.2 °C at the 5 mm- and 7 mmdeep locations, respectively. The infill percentage makes little difference in the heating efficacy. Based on these findings, this translational study sheds light on the possibility of wearable breast hyperthermia with the 3D-printed flexible and conformal antennas.