記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2967/jnmt.124.269096

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s12194-025-00887-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Dynamic WaveArc (DWA) is a technique used for continuous, non-coplanar volumetric-modulated arc therapy on the Vero4DRT platform. This study aimed to evaluate the application of single-isocenter DWA (SI-DWA) for treating multiple brain metastases by comparing dose distribution and irradiation time with multi-isocenter DWA (MI-DWA) through retrospective treatment planning. Treatment plans were developed for SI-DWA and MI-DWA in 14 cases with 3-5 brain metastases. Parameters assessed included target dose indices, such as conformity index (CI) of the planning target volume (PTV), volumes of normal brain excluding gross tumor volumes (GTVs) receiving a single dose equivalent of 14 Gy (V14), V30%, V20%, V10%, volumes of normal brain, including GTVs receiving a single dose equivalent of 12 Gy (V12), D2% for other organs at risk, and beam-on time. SI-DWA showed inferior CI, V14, and V12 values for lesions with PTV volumes <1 cc, whereas it performed equivalently to MI-DWA for lesions with PTV volumes ≥1 cc. SI-DWA resulted in higher volumes of normal brain receiving low doses compared to MI-DWA. SI-DWA exhibited significantly shorter beam-on times than MI-DWA. In conclusion, SI-DWA is an effective method for treating multiple brain metastases with PTV volumes ≥1 cc, offering an index of radiation-induced brain necrosis comparable with MI-DWA while allowing for shorter irradiation times.

DOI： 10.1093/jrr/rrae098

Open Access

PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）  

OBJECTIVES: The aim of this study was to evaluate an influence of post-processing scatter correction in portable abdominal radiography using a low ratio anti-scatter grid (grid). METHODS: To assess tube voltage on portable abdominal radiography, a burger phantom was used to measure for inverse of image quality figure (IQFinv). For evaluation of the influence on using or not the grid, IQFinv were measured. Abdominal phantom radiographies were assessed subjectively, in random order, by six radiologic technologists. The radiographies were performed without scatter correction [IG (-)] and with scatter correction at equivalent for grid ratio 6 [IG (6)] and 8 [IG (8)]. RESULTS: There was no significant decrease in IQFinv with 75 and 80 kV in comparison of 70 kV. Even processing scatter correction, IQFinv with using the grid was significantly higher than that without using the grid. The ability to detect nasogastric tube and stomach gas were significantly better in the scatter correction. Deviation index for IG (6) and IG (8) were significantly lower than that of IG (-). DISCUSSION: Portable abdominal radiographies will be improved image quality by utilizing scatter correction, although, it is necessary to consider the scatter correction processing as this may significant decrease deviation index in the practical situation. CONCLUSION: The post-processing scatter correction should be useful for detection nasogastric tube and stomach gas in portable abdominal radiography.

DOI： 10.6009/jjrt.2019_jsrt_75.9.885

PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）  

OBJECTIVES: The aim of this study was to evaluate the effectiveness of scatter correction in the portable chest radiography. METHODS: Digital radiographies were performed without anti-scatter grid (grid), with the scatter correction and with the grid ratio of 3 : 1 in this study. The scatter fraction and the detectability of low contrast signals were measured using the four acrylic phantoms of different thicknesses. The chest phantom radiographs were assessed subjectively, in random order, by six radiologic technologists. RESULTS: The scatter fraction was higher in the no-grid technique, and was lower for the grid technique. The detectability of low contrast signals did not significantly differ between the scatter correction and the grid technique (p>0.05). The area under the receiver operating characteristic curve for the grid technique was higher than that for the scatter correction technique (0.888 vs. 0.855), although no significant difference was found between the grid and the scatter correction technique (p> 0.05). The ability to detect the nasogastric tube was significantly better in the grid technique (p<0.001). DISCUSSION: In the scatter correction technique, the ability of scatter removal increased as the scatter fraction increased. The scatter correction technique was unnecessary to extremely accurate alignment. In addition, patient dose can be reduced by the scatter correction technique. CONCLUSIONS: It seemed to be effective for the scatter correction in the portable chest radiography.

DOI： 10.6009/jjrt.2016_jsrt_72.12.1207

PubMed

出版者・発行元：SPIE  

DOI： 10.1117/12.843890

記述言語：日本語   出版者・発行元：公益社団法人 日本放射線技術学会  

DOI： 10.18973/cigjsrt.33.2_63

記述言語：日本語   出版者・発行元：公益社団法人 日本放射線技術学会  

DOI： 10.6009/jjrt.66.379

DOI： 10.6009/jjrt.67.91_references_DOI_RfW7J87aen6V1zs90l8ne8jzQbB

CiNii Books

その他リンク： https://ndlsearch.ndl.go.jp/books/R000000004-I10687654

J-GLOBAL

記述言語：日本語   出版者・発行元：公益社団法人 日本放射線技術学会  

DOI： 10.18973/cigjsrt.29.2_100_2

開催年月日： 2024年10月 - 2024年11月

開催年月日： 2023年11月

開催年月日： 2022年11月

開催年月日： 2017年10月

開催年月日： 2017年8月