351
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O'Daniel J, Ren L, Yan H, Yin F. SU-E-T-70: A Protocol for Comprehensive Acceptance/Commissioning of Complex 3D QA Devices. Med Phys 2012. [DOI: 10.1118/1.4735126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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352
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Kearney V, Wang X, Gu X, Yan H, Zhen X, Jia X, Jiang S, Cervino L. SU-C-BRA-02: Evaluation of 2D DIR from CBCT to 4DCT Projections as a Tool for IGART. Med Phys 2012. [DOI: 10.1118/1.4734625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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353
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Yan H, Thomas A, Oldham M, Yin F. SU-E-T-381: Experimental Measurements of 3D Dose Distribution for a Moving Target Treated with IMRT and VMAT. Med Phys 2012. [DOI: 10.1118/1.4735468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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354
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Jia X, Yan H, Folkerts M, Jiang S. TU-A-213CD-01: GDRR: A GPU Tool for Cone-Beam CT Projection Simulations. Med Phys 2012. [DOI: 10.1118/1.4735880] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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355
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Zhen X, Yan H, Gu X, Zhou L, Jia X, Jiang S. WE-E-213CD-04: CT to Cone-Beam CT Deformable Registration With Simultaneous Intensity Correction. Med Phys 2012; 39:3960. [PMID: 28519987 DOI: 10.1118/1.4736160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE To develop and validate a robust CT to cone-beam (CBCT) deformable image registration algorithm that can handle CBCT artifacts and intensity inconsistency, and thus can yield accurate registration results. METHODS We propose a new algorithm called Deformation with Intensity Simultaneously Corrected (DISC). DISC distinguishes itself from the original demons by performing an intensity correction procedure on the CBCT image at every iteration step of demons registration. Specifically, the intensity correction of a voxel in CBCT is achieved by matching the first and the second moments of the image intensities inside a patch around this voxel with those on the CT image. It is expected that such a strategy can remove artifacts in the CBCT image, as well as ensuring the intensity consistency between the two modalities and hence facilitating the registration process. DISC is implemented on computer graphics processing units (GPUs) using the compute unified device architecture (CUDA) programming environment. The performance of DISC has been qualitatively and quantitatively evaluated on a simulated patient case and six head-and- neck cancer patient data. RESULTS Visual inspection shows that original demons distorts the tissues after registration, especially in regions which are heavily degraded by artifacts. DISC, on the other hand, can effectively register CT and CBCT image even in regions contaminated by severe artifacts. The intensity corrected CBCT that extracted from the last iteration of DISC is artifact-free and has similar histogram distribution with the deformed CT. CONCLUSIONS We have developed a robust CT to CBCT deformable image registration method that properly deals with the CBCT artifacts and intensity inconsistency, and thus yields accurate registration results. This work is supported in part by the University of California Lab Fees Research Program, the Master Research Agreement from Varian Medical Systems, Inc., and the grants from the National Natural Science Foundation of China (No.30970866).
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356
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Chang Z, Wu Q, Adamson J, Ren L, Bowsher J, Yan H, Thomas A, Yin F. SU-E-T-74: Assessing Effects of Ion Collection Efficiency in Flattening Filter-Free (FFF) Beams on Three TrueBeam Machines. Med Phys 2012. [DOI: 10.1118/1.4735130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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357
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Zhen X, Graves Y, Yan H, Zhou L, Jia X, Jiang S. WE-E-213CD-07: Deformable Registration Between CT and Truncated CBCT for Adaptive Therapy Dose Calculation. Med Phys 2012; 39:3961. [DOI: 10.1118/1.4736163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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358
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Wang X, Yan H, Cervino L, Jia X, Jiang S. TU-C-213CD-07: Explore Inherent Data Structure in Thoracic CBCT Projections Using Manifold Learning. Med Phys 2012. [DOI: 10.1118/1.4735934] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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359
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Wang X, Kearney V, Yan H, Jia X, Cervino L, Jiang S. TH-C-BRA-09: Robust 3D Lung Tumor Tracking Using Maximum Likelihood Estimation. Med Phys 2012. [DOI: 10.1118/1.4736325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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360
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Schneider DA, Harrington RD, Zhuang D, Yan H, Truscott TC, Dassanayake RP, O'Rourke KI. Disease-associated prion protein in neural and lymphoid tissues of mink (Mustela vison) inoculated with transmissible mink encephalopathy. J Comp Pathol 2012; 147:508-21. [PMID: 22595634 DOI: 10.1016/j.jcpa.2012.03.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 03/13/2012] [Accepted: 03/31/2012] [Indexed: 11/18/2022]
Abstract
Transmissible spongiform encephalopathies (TSEs) are diagnosed by immunodetection of disease-associated prion protein (PrP(d)). The distribution of PrP(d) within the body varies with the time-course of infection and between species, during interspecies transmission, as well as with prion strain. Mink are susceptible to a form of TSE known as transmissible mink encephalopathy (TME), presumed to arise due to consumption of feed contaminated with a single prion strain of ruminant origin. After extended passage of TME isolates in hamsters, two strains emerge, HY and DY, each of which is associated with unique structural isoforms of PrP(TME) and of which only the HY strain is associated with accumulation of PrP(TME) in lymphoid tissues. Information on the structural nature and lymphoid accumulation of PrP(TME) in mink is limited. In this study, 13 mink were challenged by intracerebral inoculation using late passage TME inoculum, after which brain and lymphoid tissues were collected at preclinical and clinical time points. The distribution and molecular nature of PrP(TME) was investigated by techniques including blotting of paraffin wax-embedded tissue and epitope mapping by western blotting. PrP(TME) was detected readily in the brain and retropharyngeal lymph node during preclinical infection, with delayed progression of accumulation within other lymphoid tissues. For comparison, three mink were inoculated by the oral route and examined during clinical disease. Accumulation of PrP(TME) in these mink was greater and more widespread, including follicles of rectoanal mucosa-associated lymphoid tissue. Western blot analyses revealed that PrP(TME) accumulating in the brain of mink is structurally most similar to that accumulating in the brain of hamsters infected with the DY strain. Collectively, the results of extended passage in mink are consistent with the presence of only a single strain of TME, the DY strain, capable of inducing accumulation of PrP(TME) in the lymphoid tissues of mink but not in hamsters. Thus, mink are a relevant animal model for further study of this unique strain, which ultimately may have been introduced through consumption of a TSE of ruminant origin.
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361
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Lane AD, Heffernan KS, Rossow LM, Fahs CA, Ranadive SM, Yan H, Baynard T, Wilund K, Fernhall B. Aortic reservoir function, estimated myocardial demand and coronary perfusion pressure following steady-state and interval exercise. Clin Physiol Funct Imaging 2012; 32:353-60. [DOI: 10.1111/j.1475-097x.2012.01136.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2011] [Accepted: 03/13/2012] [Indexed: 01/09/2023]
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362
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Collins BA, Cochran JE, Yan H, Gann E, Hub C, Fink R, Wang C, Schuettfort T, McNeill CR, Chabinyc ML, Ade H. Polarized X-ray scattering reveals non-crystalline orientational ordering in organic films. NATURE MATERIALS 2012; 11:536-43. [PMID: 22504534 DOI: 10.1038/nmat3310] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Accepted: 03/20/2012] [Indexed: 05/22/2023]
Abstract
Molecular orientation critically influences the mechanical, chemical, optical and electronic properties of organic materials. So far, molecular-scale ordering in soft matter could be characterized with X-ray or electron microscopy techniques only if the sample exhibited sufficient crystallinity. Here, we show that the resonant scattering of polarized soft X-rays (P-SoXS) by molecular orbitals is not limited by crystallinity and that it can be used to probe molecular orientation down to size scales of 10 nm. We first apply the technique on highly crystalline small-molecule thin films and subsequently use its high sensitivity to probe the impact of liquid-crystalline ordering on charge mobility in polymeric transistors. P-SoXS also reveals scattering anisotropy in amorphous domains of all-polymer organic solar cells where interfacial interactions pattern orientational alignment in the matrix phase, which probably plays an important role in the photophysics. The energy and q-dependence of the scattering anisotropy allows the identification of the composition and the degree of orientational order in the domains.
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363
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Gann E, Young AT, Collins BA, Yan H, Nasiatka J, Padmore HA, Ade H, Hexemer A, Wang C. Soft x-ray scattering facility at the Advanced Light Source with real-time data processing and analysis. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:045110. [PMID: 22559579 DOI: 10.1063/1.3701831] [Citation(s) in RCA: 196] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We present the development and characterization of a dedicated resonant soft x-ray scattering facility. Capable of operation over a wide energy range, the beamline and endstation are primarily used for scattering from soft matter systems around the carbon K-edge (∼285 eV). We describe the specialized design of the instrument and characteristics of the beamline. Operational characteristics of immediate interest to users such as polarization control, degree of higher harmonic spectral contamination, and detector noise are delineated. Of special interest is the development of a higher harmonic rejection system that improves the spectral purity of the x-ray beam. Special software and a user-friendly interface have been implemented to allow real-time data processing and preliminary data analysis simultaneous with data acquisition.
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364
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Yan H, Guo H. Efficiency and its bounds for thermal engines at maximum power using Newton's law of cooling. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:011146. [PMID: 22400551 DOI: 10.1103/physreve.85.011146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 09/29/2011] [Indexed: 05/31/2023]
Abstract
We study a thermal engine model for which Newton's cooling law is obeyed during heat transfer processes. The thermal efficiency and its bounds at maximum output power are derived and discussed. This model, though quite simple, can be applied not only to Carnot engines but also to four other types of engines. For the long thermal contact time limit, new bounds, tighter than what were known before, are obtained. In this case, this model can simulate Otto, Joule-Brayton, Diesel, and Atkinson engines. While in the short contact time limit, which corresponds to the Carnot cycle, the same efficiency bounds as that from Esposito et al. [Phys. Rev. Lett. 105, 150603 (2010)] are derived. In both cases, the thermal efficiency decreases as the ratio between the heat capacities of the working medium during heating and cooling stages increases. This might provide instructions for designing real engines.
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365
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Wang K, Yan H, Liu Y, Leng Z, Wang B, Zhao J. Increasing prevalence of HIV and syphilis but decreasing rate of self-reported unprotected anal intercourse among men who had sex with men in Harbin, China: results of five consecutive surveys from 2006 to 2010. Int J Epidemiol 2011; 41:423-32. [DOI: 10.1093/ije/dyr182] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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366
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Song Z, Hua Z, You Y, Zhai Z, Yan H. A case of borderline leprosy presenting with urticaria-like eruptions: are there lessons to be learned for allergists? Allergy 2011; 66:1622-4. [PMID: 21988321 DOI: 10.1111/j.1398-9995.2011.02733.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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367
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Zhang ML, Yan H, Pan G. Microbial degradation of microcystin-LR by Ralstonia solanacearum. ENVIRONMENTAL TECHNOLOGY 2011; 33:1779-1787. [PMID: 22439565 DOI: 10.1080/09593330.2011.556148] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A bacterial strain was isolated from Lake Dianchi (China) and its degradability and degradative pathways of the cyanobacterial toxin microcystin-LR (MC-LR) were studied. On the basis of morphological, physiological and biochemical tests, the strain was identified as Ralstonia solanacearum. The acute oral toxicity tests showed that Ralstonia solanacearum belongs to a non-toxic class. This bacterium degraded MC-LR at the rate of 9.4 mg/L per day, which was higher than those of the other bacterial strains reported in the literature. As for the degradative pathways, the results showed that the Adda-Arg peptide bond of MC-LR was initially hydrolysed by Ralstonia solanacearum to form a linear molecule as an intermediate. The intermediate product subsequently underwent a cyclisation reaction via dehydration to form a final product with a small peptide ring at one end of the molecule. These biodegradative pathways were different from those reported with other bacterial strains, suggesting that MC-LR may undergo different transformations, and different products were formed due to different compositions of bacteria present in natural lakes and reservoirs. These results suggest that there is a significant potential for Ralstonia solanacearum as a degrader for MC-LR removal from wastewater.
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368
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Rai MA, Chun Hao S, Blais ME, Rostron T, Zhang Y, Xu KY, Yan H, McMichael AJ, Dong T, Rowland-Jones S. HLA allele distributions and associations in a cohort of LTNPs from China. Retrovirology 2011. [PMCID: PMC3112801 DOI: 10.1186/1742-4690-8-s1-a84] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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369
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Ranadive SM, Fahs CA, Yan H, Rossow LM, Agiovlasitis S, Fernhall B. Comparison of the acute impact of maximal arm and leg aerobic exercise on arterial stiffness. Eur J Appl Physiol 2011; 112:2631-5. [PMID: 22083536 DOI: 10.1007/s00421-011-2238-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Accepted: 11/02/2011] [Indexed: 11/26/2022]
Abstract
Acute aerobic exercise decreases arterial stiffness based on the intensity of the exercise and the arterial segment studied. Arm exercise may differentially affect arterial stiffness compared to leg exercise but this has not been studied. We hypothesized that maximal aerobic exercise would reduce local peripheral pulse wave velocity i.e. femoral-dorsalis pedis (LPWV) following leg exercise and carotid-radial (APWV) following arm exercise without any crossover effect. The main purpose of the study is to compare the effects of maximal arm versus leg aerobic exercise on peripheral and central arterial stiffness. Fifteen healthy participants (9 males and 6 females, 25 ± 5 years) performed maximal arm-ergometer and leg-ergometer exercise in a randomized, crossover design. Peripheral and central pulse wave velocities (PWV) were obtained using applanation tonometry before and 10 min after each maximal exercise bout. 2 × 2 repeated measures analysis of variance was used to detect differences between conditions. There was a significant interaction in the APWV between the two exercise modes. However, there was no condition or interaction effect on LPWV following maximal arm versus leg exercise. There was no significant difference in central PWV between conditions or with time. There was no change in MAP (75 ± 6-77 ± 3) after maximal arm exercise as compared to the maximal leg exercise (73 ± 6-80 ± 2). Arm exercise produced a more generalized effect on arterial stiffness than leg exercise. The prescription of upper limb exercise may be considered for purposes of eliciting post-exercise systemic changes in arterial stiffness.
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370
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Li Z, Wang H, Lv S, Liu L, Guo W, Yuan M, Yan H, Zhao H, Lang S. Clinical comparative study on efficacy and safety for treatment of coronary heart disease with cobalt-base alloy bio absorbable polymer sirolimus-eluting stent and PARTNER stent. BRITISH HEART JOURNAL 2011. [DOI: 10.1136/heartjnl-2011-300867.435] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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371
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Liu W, Yan H, Lin W, Ahmad M, Cho B, Keall P, Luxton G, Xing L, Nath R. Optimizing Imaging Dose and Targeting Accuracy in IGRT for Real-time Radiographic Motion Tracking. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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372
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Zheng X, Huang Y, Wang Z, Yan H, Pan S, Wang H. Presumed cytomegalovirus-associated retrobulbar optic neuritis in a patient after allogeneic stem cell transplantation. Transpl Infect Dis 2011; 14:177-9. [PMID: 22093546 DOI: 10.1111/j.1399-3062.2011.00678.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 06/03/2011] [Accepted: 07/25/2011] [Indexed: 11/28/2022]
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373
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Yin F, Thomas A, Yan H, Vergalasova I, Adamovics J, Wu Q, Oldham M. SU-E-T-99: A Patient Specific QA Protocol for Verification of 4D Dosimetry. Med Phys 2011. [DOI: 10.1118/1.3612050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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374
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Malkowski S, Adhikari R, Hona B, Mattie C, Woods D, Yan H, Plaster B. Technique for high axial shielding factor performance of large-scale, thin, open-ended, cylindrical Metglas magnetic shields. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:075104. [PMID: 21806224 DOI: 10.1063/1.3605665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Metglas 2705M is a low-cost commercially available, high-permeability cobalt-based magnetic alloy, provided as a 5.08-cm wide and 20.3-μm thick ribbon foil. We present an optimized construction technique for single-shell, large-scale (human-size), thin, open-ended cylindrical Metglas magnetic shields. The measured dc axial and transverse magnetic shielding factors of our 0.61-m diameter and 1.83-m long shields in the Earth's magnetic field were 267 and 1500, for material thicknesses of only 122 μm (i.e., 6 foil layers). The axial shielding performance of our single-shell Metglas magnetic shields, obtained without the use of magnetic shaking techniques, is comparable to the performance of significantly thicker, multiple-shell, open-ended Metglas magnetic shields in comparable-magnitude, low-frequency applied external fields reported previously in the literature.
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375
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Yan H, Ahmad M, Nath R, Liu W. TH-E-220-05: Minimization of Imaging Dose for Real-Time Respiratory Motion Monitoring during Arc Therapy. Med Phys 2011. [DOI: 10.1118/1.3613612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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