期刊:
International Journal of Radiation Oncology Biology Physics,2023年117(2, Supplement):e479-e480 ISSN:0360-3016
通讯作者:
Q. Ni
作者机构:
[Ni, Q.] Cent South Univ, Hunan Canc Hosp, Affiliated Canc Hosp, Dept Radiat Oncol,Xiangya Sch Med, Changsha, Peoples R China.;[Ni, Q.] Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.
通讯机构:
[Q. Ni] D;Department of Radiation Oncology, Hunan Cancer Hospital, Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, China
会议名称:
65th ANNUAL MEETING OF THE AMERICAN-SOCIETY-FOR-RADIATION-ONCOLOGY (ASTRO)
会议时间:
OCT 01-04, 2023
会议地点:
San Diego, CA
摘要:
To establish the different machine learning classification predict models of gamma pass rates for specific dosimetric verification of pelvic intensity modulated radiotherapy plan which based on the radiomic features and to explore the best prediction model.
Retrospective analysis of the 3D dosimetric verification results based on measurements with gamma pass rate criteria of 3%/2 mm and 10% dose threshold of 196 pelvic intensity-modulated radiotherapy plans was carried. Prediction models were established by extracting radiomic features data. Four machine learning algorithms, random forest, support vector machine, adaptive boosting and gradient boosting decision trees, were used to calculate the AUC value, sensitivity and specificity respectively. The classification performance of the four prediction models were evaluated.
The sensitivity and specificity of the random forest, support vector machine, adaptive boosting, and gradient boosting decision trees models were 0.93,0.85,0.93,0.96, and 0.38,0.69,0.46, and 0.46, respectively. The AUC values for the random forest model and the adaptive boosting model were 0.81 and 0.82, respectively, and the AUC values for the support vector machine and gradient boosting decision tree models were 0.87.
Machine learning methods based on radiomics can be used to establish a prediction model of gamma pass rate for specific dosimetric verification of pelvic intensity modulated radiotherapy. The classification performance of support vector machine model and gradient boosting decision trees model is better than that of random forest model and adaptive boosting model. The prediction model for a specific site is helpful to improve the performance of the model.
会议名称:
12th International Conference on Position Sensitive Detectors
会议时间:
SEP 12-17, 2021
会议地点:
Birmingham, ENGLAND
会议主办单位:
[Pritchard, J. L.;Velthuis, J. J.;Beck, L.;Li, Y.;De Sio, C.;Ballisat, L.;Duan, J.;Shi, Y.;Hugtenburg, R. P.] Univ Bristol, Sch Phys, Bristol BS8 1TL, Avon, England.^[Velthuis, J. J.;Hugtenburg, R. P.] Swansea Univ Med Sch, Dept Med Phys, Swansea SA2 8QA, W Glam, Wales.^[Velthuis, J. J.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.^[Hugtenburg, R. P.] Swansea Bay Univ Hlth Board, Dept Med Phys & Clin Engn, Swansea SA2 8QA, W Glam, Wales.
关键词:
Radiotherapy concepts;Solid state detectors;X-ray detectors;Image reconstruction in medical imaging
摘要:
A multileaf collimator (MLC) is an integral component in modern radiotherapy machines as it dynamically shapes the photon field used for patient treatment. Currently, the MLC leaves which collimate the treatment field are mechanically calibrated to +/- 1mm every 3 months and during pre-treatment calibration are calibrated to the mechanically set leaf positions. Leaf drift can occur between calibration dates and hence exceed the +/- 1mm tolerance. Pre-treatment verification, increases LINAC usage time so is seldom performed for each individual patient treatment, but instead for an acceptable sample of patients and/or treatment fractions. Independent real-time treatment verification is therefore desirable. We are developing a large area CMOS MAPS upstream of the patient to monitor MLC leaf positions for real-time treatment verification. CMOS MAPS are radiation hard for photon and electron irradiation, have high readout speeds and low attenuation which makes them an ideal upstream radiation detector for radiotherapy. Previously, we reported on leaf position reconstruction for single leaves using the Lassena, a 12 x 14 cm(2), three side buttable MAPS suitable for clinical deployment. Sobel operator based methods were used for edge reconstruction. It was shown that the correspondence between reconstructed and set leaf position was excellent and resolutions ranged between 60.6 +/- 8 and 109 +/- 12 mu m for a single central leaf with leaf extensions ranging from 1 to 35 mm using 0.3 sec of treatment beam time at 400MU/min. Here, we report on leaf edge reconstruction using updated methods for complex leaf configurations, as occur in clinical use. Results show that leaf positions can be reconstructed with resolutions of 62 +/- 6 mu m for single leaves and 86 +/- 16 mu m for adjacent leaves at the isocenter using 0.15 sec at 400 MU/min of treatment beam. These resolutions are significantly better than current calibration standards.
会议名称:
9th International Conference on High Levels of Environmental Radiation Areas - For Understanding Chronic Low-Dose-Rate Radiation Exposure Health Effects and Social Impacts
会议时间:
SEP 24-27, 2018
会议地点:
Hirosaki Univ, Aomori, JAPAN
会议主办单位:
Hirosaki Univ
摘要:
For more accurate measurement of the potential alpha energy concentration (PAEC) of radon progeny by the liquid scintillation counting (LSC) method, its counting efficiency was studied in this work. A radon progeny standard source was used to provide different concentrations of radon progeny, and the progeny collected on the sampling filters were measured with a low background liquid scintillation counter. The result showed that the quenching effect could not be ignored, and the counting efficiency was estimated to be 86.12%. The co-comparison experiments showed that the PAECs of radon progeny measured by the LSC methods were in generally consistent with those of other three methods. It indicates that for more accurate measurements of PAEC of radon progeny by using the LSC method, the counting efficiency should be well determined.
会议论文集名称:
IEEE Nuclear Science Symposium and Medical Imaging Conference
摘要:
There is a need for non-destructive assay of large concrete objects like bridges and buildings. Key issues are the thickness, density and reinforcement configuration as well as indications of cracks or delamination. Furthermore, changes in the condition of concrete structures like corrosion, degradation or cavitation and voids due to ageing can pose problems. Muon scattering tomography is a non-invasive method well suited to scan large concrete samples and detect low- and high-density inclusions such as iron bars or cracks/voids in concrete. The work presented here demonstrates that with muon scattering tomography it is possible to detect rebars of a volume of 894 +/- 386 cm(3) in a thick concrete floor. For iron volumes above 2 500 cm(3), the rebar volume can be reconstructed with a resolution of 5.4 +/- 0.3% and the relative uncertainty is better than 10%. It is also shown that it is possible to image rebar structures in reinforced concrete and distinguish between single and a double layer of a rebar grid. The method was developed using Monte Carlo simulations, but it is foreseen to compare simulated data to real data collected with our muon detection system in the future.
作者:
Mo, H. S.;Zhang, X. L.;Cheng, Z. F.*;Zhang, X. Y.;Yang, Z. J.;...
期刊:
Journal of Instrumentation,2019年14(10):C10022 ISSN:1748-0221
通讯作者:
Cheng, Z. F.
作者机构:
[Xu, Z. C.; Li, Q.; Mo, H. S.; Jiao, S. D.; Zhang, X. Y.; Yang, Z. J.; Zhou, Y. N.; Cheng, Z. F.] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Sch Elect & Elect Engn, Int Joint Res Lab Magnet Confinement Fus & Plasma, Wuhan 430074, Hubei, Peoples R China.;[Xu, Z. C.; Li, Q.; Mo, H. S.; Jiao, S. D.; Zhang, X. Y.; Yang, Z. J.; Zhou, Y. N.; J-TEXT Team; Cheng, Z. F.] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China.;[Zhang, X. L.] Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Guangdong, Peoples R China.;[Zhang, H. M.; Lyu, B.; He, L.] Chinese Acad Sci, Inst Plasma Phys, Hefei 230026, Anhui, Peoples R China.;[He, L.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构:
[Cheng, Z. F.] H;Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Sch Elect & Elect Engn, Int Joint Res Lab Magnet Confinement Fus & Plasma, Wuhan 430074, Hubei, Peoples R China.;Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China.
会议名称:
3rd European Conference on Plasma Diagnostics (ECPD)
会议时间:
MAY 06-10, 2019
会议地点:
Lisbon, PORTUGAL
会议主办单位:
[Mo, H. S.;Cheng, Z. F.;Zhang, X. Y.;Yang, Z. J.;Zhou, Y. N.;Jiao, S. D.;Li, Q.;Xu, Z. C.] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Sch Elect & Elect Engn, Int Joint Res Lab Magnet Confinement Fus & Plasma, Wuhan 430074, Hubei, Peoples R China.^[Mo, H. S.;Cheng, Z. F.;Zhang, X. Y.;Yang, Z. J.;Zhou, Y. N.;Jiao, S. D.;Li, Q.;Xu, Z. C.;J-TEXT Team] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China.^[Zhang, X. L.] Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Guangdong, Peoples R China.^[Zhang, H. M.;Lyu, B.;He, L.] Chinese Acad Sci, Inst Plasma Phys, Hefei 230026, Anhui, Peoples R China.^[He, L.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词:
Detector alignment and calibration methods (lasers, sources, particle-beams);Nuclear instruments and methods for hot plasma diagnostics;Radiation calculations
摘要:
A space-resolved Vacuum Ultraviolet (VUV) spectroscopy system based on a 1-meter normal incidence spectrometer has been developed on J-TEXT tokamak. To obtain the impurity emission profile, the Optical path and absolute intensity calibration are implemented. An alignment plate customized with several different shaped apertures is mounted between the entrance of the spectrometer and the tokamak. The exact viewing angle is identified via the on-site test. The collisional-radiative line ratio method based on the impurity transport code STRAHL is applied for the absolute intensity calibration. Pairs of lines with different upper energy levels for the same ions, e.g. C III 465 nm/C III 97.7 nm, C IV 580 nm/C IV 154.8 nm are chosen to achieve the calibration. A calibrated visible spectrometer is used to provide the absolute intensity of the visible branch. The line emission profile in the VUV range could be evaluated from the visible line via STRAHL and the atomic data from ADAS to take into account the effect of temperature on the ratio of the selected line pair. Based on the calibrated coefficient, the radial emission profiles of C III 97.7 nm and C IV 154.8 nm are obtained.
作者:
De Sio, C.*;Velthuis, J. J.;Beck, L.;Hugtenburg, R. P.;Pritchard, J. L.
作者机构:
[De Sio, C.; Beck, L.; Pritchard, J. L.] Univ Bristol, HH Wills Phys Lab, Sch Phys, Tyndall Ave, Bristol BS8 1TL, Avon, England.;[Hugtenburg, R. P.; Velthuis, J. J.] Univ Bristol, Sch Phys, Bristol BS8 1TL, Avon, England.;[Velthuis, J. J.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Hugtenburg, R. P.; Velthuis, J. J.] Swansea Univ, Sch Med, Swansea SA2 8PP, W Glam, Wales.;[Hugtenburg, R. P.] Abertawe Bro Morgannwg Univ Hosp Board, Dept Med Phys & Clin Engn, Swansea SA2 4QA, W Glam, Wales.
会议名称:
IEEE Nuclear Science Symposium / Medical Imaging Conference (NSS/MIC)
会议时间:
OCT 26-NOV 02, 2019
会议地点:
Manchester, ENGLAND
会议主办单位:
[De Sio, C.;Beck, L.;Pritchard, J. L.] Univ Bristol, HH Wills Phys Lab, Sch Phys, Tyndall Ave, Bristol BS8 1TL, Avon, England.^[Velthuis, J. J.;Hugtenburg, R. P.] Univ Bristol, Sch Phys, Bristol BS8 1TL, Avon, England.^[Velthuis, J. J.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.^[Velthuis, J. J.;Hugtenburg, R. P.] Swansea Univ, Sch Med, Swansea SA2 8PP, W Glam, Wales.^[Hugtenburg, R. P.] Abertawe Bro Morgannwg Univ Hosp Board, Dept Med Phys & Clin Engn, Swansea SA2 4QA, W Glam, Wales.
会议论文集名称:
IEEE Nuclear Science Symposium and Medical Imaging Conference
摘要:
Monolithic Active Pixel Sensor (MAPS) devices are an effective tool for upstream verification of Intensity Modulated Radio Therapy treatments. It is crucial to measure with high precision the positions of the Multi Leaf Collimators (MLC) used to shape the beam, in order to enhance the quality and safety of treatments. This work describes a two-step procedure applied to the problems of leaf detection and position reconstruction. This procedure represents the building block towards the definition of a real-time verification device capable of detecting and reconstructing the position of the MLC used in the everyday radiotherapy treatments. A Fully Convolutional Neural Network model is used to analyse the high-resolution images produced by Lassena MAPS devices in order to automatically detect the leaves. A Random Forest regression model is then applied to estimate the positions of the detected leaves. The dataset used in the experiments contains 1200 single-leaf images, referring to four leaf positions in the range 1 divided by 25 mm, split in training and test sets with the 80% and 20% of the total samples, respectively. Performance have been evaluated using the Dice loss coefficient for leaf detection, and mean squared error (MSE) as for leaf position estimation. The proposed approach obtained an average dice loss coefficient of 0.85 +/- 0.03 on the images in the test set; the MLC positions are estimated with a MSE of 0.04, and a resolution of 68 +/- 2 mu m on the same images.
作者:
Cooke, C.*;Velthuis, J. J.;Beck, L.;Martin, P.
作者机构:
[Martin, P.; Cooke, C.; Beck, L.; Velthuis, J. J.] Univ Bristol, HH Wills Phys Lab, Sch Phys, Tyndall Ave, Bristol BS8 1TL, Avon, England.;[Velthuis, J. J.] Univ South China, Sch Nucl Sci & Technol, 28 West Changsheng Rd, Hengyang, Peoples R China.
会议名称:
IEEE Nuclear Science Symposium / Medical Imaging Conference (NSS/MIC)
会议时间:
OCT 26-NOV 02, 2019
会议地点:
Manchester, ENGLAND
会议主办单位:
[Cooke, C.;Velthuis, J. J.;Beck, L.;Martin, P.] Univ Bristol, HH Wills Phys Lab, Sch Phys, Tyndall Ave, Bristol BS8 1TL, Avon, England.^[Velthuis, J. J.] Univ South China, Sch Nucl Sci & Technol, 28 West Changsheng Rd, Hengyang, Peoples R China.
会议论文集名称:
IEEE Nuclear Science Symposium and Medical Imaging Conference
摘要:
For homeland security applications, it is of high importance to locate radioactive sources. This is usually done using networks of sensors. We developed a technique to obtain the distance between the source and detector using a single detector without knowledge of the source activity. The percentage of detected counts in a radiation detector with energies lower than the photopeak is used to find the distance between the detector and stationary gamma source. This method has been tested using Geant4 simulations for Cs-137, Co-60 and U-235, and experimentally confirmed for Cs-137. A very strong correlation between the true distance and reconstructed distance was found. High and low air pressure simulations were also tested for Cs-137 and found to retain good distance resolution.
期刊:
Advances in Intelligent Systems and Computing,2019年778:68-76 ISSN:2194-5357
通讯作者:
Li, Pengcheng
作者机构:
[Jin, Xiao; Li, Pengcheng; Zhang, Li; Li, Xiaofang; Dai, Licao] Univ South China, Human Factor Inst, Hengyang 421001, Hunan, Peoples R China.;[Li, Pengcheng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构:
[Li, Pengcheng] U;Univ South China, Human Factor Inst, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
会议名称:
9th International Conference on Applied Human Factors and Ergonomics and the Affiliated Conferences (AHFE) / 2nd International Conference on Human Error, Reliability, Resilience, and Performance (HERRP)
会议时间:
JUL 21-25, 2018
会议地点:
Orlando, FL
会议主办单位:
[Li, Pengcheng;Li, Xiaofang;Dai, Licao;Zhang, Li;Jin, Xiao] Univ South China, Human Factor Inst, Hengyang 421001, Hunan, Peoples R China.^[Li, Pengcheng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称:
Advances in Intelligent Systems and Computing
关键词:
Digital nuclear power plants;Human factor event report;Performance Influencing Factors;Team situation awareness
摘要:
In the digital main control rooms (MCRs) of nuclear power plants (NPPs), the role and responsibility of operators as well as their communication ways are changed by the digitization of the human-machine interface, which leads to some new team situation awareness (TSA) errors and different error distribution. In order to identify the interaction mechanism among a team during collecting information and consistently understanding the system/component status, an team interaction model is established by field observation, video analysis, operator interview and event report analysis. Furthermore, the model-based TSA error classification is developed and the influencing factors of TSA error are identified. On this basis, a number of human factor event reports are analyzed and combining with statistical analysis to identify the main TSA errors and influencing factors in digital NPPs. It provides theoretical support for the prevention and control of TSA errors.
作者:
Pritchard, J. L.*;Velthuis, J. J.;Beck, L.;De Sio, C.;Hugtenburg, R. P.
作者机构:
[De Sio, C.; Hugtenburg, R. P.; Beck, L.; Pritchard, J. L.; Velthuis, J. J.] Univ Bristol, Sch Phys, Bristol BS8 1TL, Avon, England.;[Hugtenburg, R. P.; Velthuis, J. J.] Swansea Univ, Sch Med, Swansea SA2 8PP, W Glam, Wales.;[Velthuis, J. J.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Hugtenburg, R. P.] Abertawe Bro Morgannwg Univ Hosp Board, Dept Med Phys & Clin Engn, Swansea SA2 4QA, W Glam, Wales.
会议名称:
IEEE Nuclear Science Symposium / Medical Imaging Conference (NSS/MIC)
会议时间:
OCT 26-NOV 02, 2019
会议地点:
Manchester, ENGLAND
会议主办单位:
[Pritchard, J. L.;Velthuis, J. J.;Beck, L.;De Sio, C.;Hugtenburg, R. P.] Univ Bristol, Sch Phys, Bristol BS8 1TL, Avon, England.^[Velthuis, J. J.;Hugtenburg, R. P.] Swansea Univ, Sch Med, Swansea SA2 8PP, W Glam, Wales.^[Velthuis, J. J.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.^[Hugtenburg, R. P.] Abertawe Bro Morgannwg Univ Hosp Board, Dept Med Phys & Clin Engn, Swansea SA2 4QA, W Glam, Wales.
会议论文集名称:
IEEE Nuclear Science Symposium and Medical Imaging Conference
摘要:
Multileaf collimators (MLC) are an integral component in modern radiotherapy as they shape the X-ray treatment beam and therefore need to be closely controlled. Currently, MLC leaves are calibrated to +/- 1 mm every month, however leaves can drift beyond this during calibration dates and treatment verification only occurs pre-treatment. MAPS are radiation hard in photon and electron irradiation, have high readout speeds and low attenuation which makes them an ideal upstream radiation detector. Here, we report results using the Lassena MAPS, which is 12x14 cm(2), three side buttable and is capable of clinical deployment. We have previously shown that the Achilles MAPS can reconstruct 1 cm leaf edge positions with a 52 +/- 4 mu m precision in 0.1 s of treatment beam. The Achilles however, is sized 6x6 cm(2), is not buttable and hence, cannot be used for real time clinical monitoring. Additionally, Achillies has a pixel pitch of 14.5 mu m whilst the Lassena has a 50 mu m pixel pitch. The Lassena detector was placed in the treatment field of an Elekta Synergy LINAC and an MLC leaf of width 0.5 cm, positioned stepwise. Sobel-based methods were used to calculate leaf edge positions, resolutions and plot as a function of set leaf position. Correspondence between reconstructed and set leaf position was excellent and resolutions ranged between 52.9 +/- 8.5 mu m and 142 +/- 31.6 mu m for 0.3 s of treatment beam, which is significantly lower than the +/- 0.5 mm uncertainty in LINAC set position.
作者:
Yu, T.;Cao, P.*;Ji, X. Y.;Xie, L. K.;Huang, X. R.;...
期刊:
IEEE TRANSACTIONS ON NUCLEAR SCIENCE,2019年66(7):1095-1099 ISSN:0018-9499
通讯作者:
Cao, P.
作者机构:
[An, Q.; Feng, C. Q.; Liu, S. B.; Yu, T.; Huang, X. R.; Yu, L.; Cao, P.] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China.;[An, Q.; Feng, C. Q.; Liu, S. B.; Yu, T.; Huang, X. R.; Yu, L.; Cao, P.] Key Lab Particle Detect & Elect, Hefei 230026, Peoples R China.;[Xie, L. K.; Ji, X. Y.] Univ Sci & Technol China, Dept Engn & Appl Phys, Hefei 230026, Peoples R China.;[Zhang, L. Y.; Sun, Z. J.; Xie, L. K.; Fan, R. R.; Ji, X. Y.] State Key Lab Particle Detect & Elect, Hefei 230026, Peoples R China.;[Cui, Z. Q.; Bai, H. Y.; Jiang, H. Y.; Zhang, G. H.] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Inst Heavy Ion Phys, Beijing 100871, Peoples R China.
通讯机构:
[Cao, P.] U;Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China.
会议名称:
21st IEEE-Nuclear-and-Plasma-Sciences-Society (NPSS) Real Time (RT) Conference
会议时间:
JUN 09-15, 2018
会议地点:
Williamsburg, VA
会议主办单位:
[Yu, T.;Cao, P.;Huang, X. R.;An, Q.;Feng, C. Q.;Liu, S. B.;Yu, L.] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China.^[Yu, T.;Cao, P.;Huang, X. R.;An, Q.;Feng, C. Q.;Liu, S. B.;Yu, L.] Key Lab Particle Detect & Elect, Hefei 230026, Peoples R China.^[Ji, X. Y.;Xie, L. K.] Univ Sci & Technol China, Dept Engn & Appl Phys, Hefei 230026, Peoples R China.^[Ji, X. Y.;Xie, L. K.;Fan, R. R.;Sun, Z. J.;Zhang, L. Y.] State Key Lab Particle Detect & Elect, Hefei 230026, Peoples R China.^[Bai, H. Y.;Cui, Z. Q.;Jiang, H. Y.;Zhang, G. H.] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Inst Heavy Ion Phys, Beijing 100871, Peoples R China.^[Bao, J.;He, G. Z.;Huang, H. X.;Luan, G. Y.;Ren, J.;Ruan, X. C.;Tang, H. Q.;Wang, Q.;Wang, Z. H.;Wu, X. G.;Zhang, Q. W.;Zhong, Q. P.;Zhou, Z. Y.] China Inst Atom Energy, Beijing 102413, Peoples R China.^[Chen, Y. H.;Fan, R. R.;Gu, M. H.;He, Y. C.;Huang, W. L.;Ji, X. L.;Jiang, W.;Jing, H. T.;Kang, L.;Li, B.;Li, L.;Li, Q.;Li, X.;Ma, Y. L.;Ning, C. J.;Sun, H.;Sun, X. Y.;Sun, Z. J.;Tan, Z. X.;Tang, J. Y.;Wang, P. C.;Wang, Y. F.;Wang, Z.;Wu, Q. B.;Wu, X.;Yi, H.;Yu, Y. J.;Zhang, L. Y.;Zhang, J.;Zhou, L.;Zhu, K. J.] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.^[Chen, Y. H.;Fan, R. R.;Gu, M. H.;He, Y. C.;Huang, W. L.;Ji, X. L.;Jiang, W.;Jing, H. T.;Kang, L.;Li, B.;Li, L.;Li, Q.;Li, X.;Ma, Y. L.;Ning, C. J.;Sun, H.;Sun, X. Y.;Sun, Z. J.;Tan, Z. X.;Tang, J. Y.;Wang, P. C.;Wang, Y. F.;Wang, Z.;Wu, Q. B.;Wu, X.;Yi, H.;Yu, Y. J.;Zhang, L. Y.;Zhang, J.;Zhou, L.;Zhu, K. J.] Dongguan Neutron Sci Ctr, Dongguan 523803, Peoples R China.^[Cheng, P. J.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.^[Han, Z. J.;Liu, R.;Liu, X. Y.;Wen, J.;Wen, Z. W.;Yang, Y. W.] CAEP, Inst Nucl Phys & Chem, Mianyang 621900, Sichuan, Peoples R China.^[He, Y. F.] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.^[Song, Z. H.;Zhang, X. P.] Northwest Inst Nucl Technol, Xian 710000, Shaanxi, Peoples R China.^[Wang, T. F.] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100083, Peoples R China.^[Zhang, Q. M.;Zhao, Y. T.] Xi An Jiao Tong Univ, Dept Nucl Sci & Technol, Sch Energy & Power Engn, Xian 710049, Peoples R China.
作者机构:
[Wang, M.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Shan, D. C.; Liao, Y.] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
会议名称:
6th Global Conference on Materials Science and Engineering (CMSE)
会议时间:
OCT 24-27, 2017
会议地点:
Beijing, PEOPLES R CHINA
会议主办单位:
[Wang, M.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.^[Shan, D. C.;Liao, Y.] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称:
IOP Conference Series-Materials Science and Engineering
摘要:
In this paper, several mechanical responses of thermoplastic polyurethane (TPU) filled with nano-scale attapulgite (AT) particles, including cyclic loading-unloading behavior, dynamic mechanical behavior and stress relaxation have been investigated. With the addition of AT, it is noticed that the strength, modulus and stress relaxation time of TPU increased significantly compared to that of unfilled materials. It is also observed that, whether filled or unfilled TPU, pronounced inelastic mechanical features such as Mullins effect, residual strain and hysteresis, occurred mainly during the first load loop, but became more notable with AT increase.
摘要:
In this paper, a computer aided system is developed for analyzing and visualizing CT images with nasopharyngeal carcinoma. In the system, firstly, an effective registration method that combines global rigid registration algorithm and local multi-resolution symmetric Demons registration algorithm is applied to match the plain CT image and the contrast-enhanced CT image of the same patient. Secondly, a total probability map is generated to roughly locate the tumor and determine an initial seed in the tumor. Here, this map is derived from CT intensities of the plain CT image and the contrast-enhanced CT image of the same patient and from location of the nasopharynx. Thirdly, a region growing method with multi feature criteria is used to segment the tumor from the volume data. Finally, the tumor and head skin are reconstructed and visualized so that the size and location of tumor are displayed. The experimental results show that this system can be used as a medical auxiliary diagnostic tool for radiologists to observe the size and location of the tumor.
会议名称:
Conference on Calorimetry for the High Energy Frontier (CHEF)
会议时间:
OCT 02-06, 2017
会议地点:
Lyon, FRANCE
会议主办单位:
[Shen, C.;Xiao, D.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.^[Shen, C.;Wang, Y.;Han, D.;Zou, Z.;Li, Y.] Tsinghua Univ, Dept Engn Phys, Key Lab Particle & Radiat Imaging, Beijing 100084, Peoples R China.^[Zheng, X.] Univ Virginia, 382 McCormick Rd, Charlottesville, VA 22904 USA.^[Chen, J.] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
关键词:
Calorimeters;Particle identification methods
摘要:
A shashlik-type electromagnetic calorimeter will be produced in Hall A of Jefferson Laboratory for the Solenoidal Large Intensity Device (SoLID). Wavelength-shifting (WLS) fibers and clear fibers will be used as the light guide part of the calorimeter. The blue light from scintillators is converted into green light by WLS fibers and is carried out to the back of the calorimeters for readout. Since the magnetic field of SoLID reaches about 1.5 T behind the calorimeters, the design is to use clear fibers to further guide the light out of the solenoid for readout by PMTs. Therefore, it is important to study the perfomance of WLS and clear fibers. This paper describes a comparative test of two different WLS fibers and a light attenuation test for a clear fiber. The results show that the performance of the two WLS fibers is the same under large curvature bending, and that the bending has no effect on the light transmission through the clear fiber. In addition, a comparison test for two fiber end-face reflective materials is also reported. It reveals that the use of silver ink as a reflective material can increase the light yield by 30%. Thereby, an optimized prototype based on the above experimental results was built and the basic performance was tested.
摘要:
Thermal characteristics during startup of CSR1000 are directly related to the security of supercritical water reactors. The heat transfer model during power-raising phase is built according to the sliding pressure mode of CSR1000 and thermal characteristics of coolant and moderator are analyzed. The results show that, during the temperature-raising phase of startup, Coolant and moderator temperatures in inner assemblies increase with core power increase only. With increases of core power and feed-water flow rate, Coolant and moderator temperatures remain unchanged during power-raising phase. Thermal properties of the coolant change in the pseudo-critical temperature and the heat transfer deterioration occurs.
会议名称:
14th Topical Seminar on Innovative Particle and Radiation Detectors
会议时间:
OCT 03-06, 2016
会议地点:
Siena, ITALY
会议主办单位:
[Shen, C.;Wang, Y.;Han, D.;Zou, Z.;Li, Y.] Tsinghua Univ, Dept Engn Phys, Key Lab Particle & Radiat Imaging, Beijing 100084, Peoples R China.^[Shen, C.;Xiao, D.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.^[Zheng, X.] Univ Virginia, 382 McCormick Rd, Charlottesville, VA 22904 USA.^[Chen, J.] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
关键词:
Calorimeter methods;Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc);Particle identification methods;Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)