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RISS 인기검색어
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- 저자 : Shinsaku Watanabe (검색결과 2 건)
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Yuichi Onishi,Shinichi Nakayama,Shinsaku Watanabe,Souichirou Kaneshige,Hajime Monzen,Kenji Matsumoto,Naoya Shintani,Takeshi Kamomae 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.1
We constructed seven intensity-modulated radiation therapy (IMRT) treatment plans for prostate cancer (49 irradiation fields which contained seven randomly-sampled patients and seven fields) and evaluated the dose distributions by using a radiochromic film (EBT3 film) and a 2D detector. We superposed the calculated dose distribution of the IMRT treatment plan on EBT3 film and the 2D detector results and then compared those with the -analysis pass rate. The relative positions of the beam and the detector were varied; the results of the analysis of the superior-inferior (SI) direction potentially differed, depending on the detector position, under an irradiation beam with the same fluence map. The detector was moved over a range of ±8 mm in the SI direction in 1-mm step increments, measurement were made at each position, and the results were analyzed. The -analysis compared the dose distributions from EBT3 film and the radiation treatment planning system (RTPS) for each patient and field; the pass rate with the -analysis from 98 to 100% was 2.04%. When we compared the dose distributions of the 2D detector and the RTPS, the pass rate from 98 to 100% was 63.2%. The mean values for the -analysis pass rates for EBT3 film and the 2D detector were 94.2 and 97.6%, respectively. Volume averaging of the data indicated a mean pass rate and standard deviation of 98.6 and 0.91%, respectively, and a pass rate of more than 96% for all positions. A 2D detector can, therefore, be used as an alternative apparatus for IMRT dose verification.
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( Motoyasu Kato ),( Yuta Arai ),( Hiroaki Motomura ),( Issei Sumiyoshi ),( Yusuke Ochi ),( Junko Watanabe ),( Hiroaki Ihara ),( Shinsaku Togo ),( Shinichi Sasaki ),( Kazuhisa Takahashi ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Background: Acute exacerbation of chronic fibrotic idiopathic interstitial pneumonia (AE-IIP) is associated with a high mortality rate. In 2016, the International Working Group classified the etiology of AE-IIP into idiopathic and triggered. Several factors can trigger AE-IIP; however, the triggers associated with the worst prognosis have not been identified. The aim of this study was to investigate the prognosis of patients with various types of AE-IIP, particularly infection-triggered, non-infection-triggered, and idiopathic AE-IIPs. Methods: We retrospectively collected data for 128 patients with chronic fibrotic IIP (CF-IIP) who were hospitalized because of respiratory failure during the period between April 2009 and March 2019 at Juntendo University Hospital. There were 79 patients who developed AE-IIP, and 21 patients who developed bacterial pneumonia combined with CF-IIP. AE-IIP was classified into idiopathic, infection-triggered, and non-infection-triggered. We analyzed differences in patient characteristics, examination findings, and prognosis among the types. Finally, we evaluated risk factors for early death due to AE-IIPs. Results: Idiopathic, infection-triggered, and non-infection-triggered AE-IIPs were diagnosed in 34, 25, and 20 patients, respectively. The survival time was significantly longer for bacterial pneumonia combined with IIP than for AE-IIP. Moreover, the survival time was significantly longer for infection-triggered AE-IIP than for idiopathic or non-infection-triggered AE-IIP. The mortality rate was significantly lower with infection-triggered AEIIP than with other types of AE-IIP. Finally, a multivariate analysis revealed that radiological findings at the time of onset of AE-IIPs and AE-IIP patterns were independent risk factors for early death. Conclusion: Our results suggest that patients with infection-triggered AE-IIP may have a better prognosis than those with other types of AE-IIP.
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