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Mao W, Chen J, Zheng M, Wu B, Zhu Y. Initial Experience of Lung Transplantation at a Single Center in China. Transplant Proc 2013; 45:349-55. [DOI: 10.1016/j.transproceed.2012.02.045] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Revised: 01/31/2012] [Accepted: 02/14/2012] [Indexed: 01/20/2023]
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102
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Lu H, Mao W, Cheng Q, Cai J, Wang X, Zhang Y, Lou C, Qin J, Lei L, Yang H. Epidermal Growth Factor Receptor Mutation in Small Cell Lung Cancer Patients Detected by Mutant-Enriched Liquidchip Technology from Plasma. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)34075-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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103
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Xu Y, Mao W, Sun X, Zheng Y, Jiang Y, Liu J. Prognosis Impact of Postoperative Radiation in Patients with Radical Esophagectomy and Pathologic Lymph Nodes Positive Esophageal Cancer. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)33327-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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104
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Jiang L, Arhjoul L, Anderson J, Nedzi L, Solberg T, Mao W. SU-E-T-551: A Customized Plan Evaluation System for On-Line Adaptive Radiotherapy. Med Phys 2012; 39:3832. [DOI: 10.1118/1.4735640] [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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105
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Zhong Z, Cai Y, Guo X, Solberg T, Mao W. SU-E-J-112: A Splatting Method to Generate DRRs for Deformed CT Volume. Med Phys 2012; 39:3678. [PMID: 28519819 DOI: 10.1118/1.4734948] [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 an efficient algorithm for generating high-quality digitally reconstructed radiographs (DRRs) for regularly and irregularly sampled volumes based on a splatting method with dynamic elliptical Gaussian kernels, and to evaluate this method using ray tracing. METHODS The traditional ray tracing method, which takes every intersected voxel into account, produces high quality DRRs but is very time consuming. Additionally, it is not suitable for handling irregularly-sampled volumes since it always requires image re-sampling, which leads to inaccuracy. We present a splatting approach to compute the 'footprint function', facilitating efficient perspective projection of elliptical Gaussian kernels at very low cost. This reported framework allows dealing with both regularly and irregularly sampled volumes effectively and efficiently. An XCAT digital phantom was used to generate 3D chest volumes at different respiratory phases, and CT projections are generated using ray tracing and the splatting method, respectively. Normalized cross correlation (NCC) is applied to evaluate the DRR similarity of two methods. RESULTS Respiratory Phases one and four are used as volume datasets from the 4D XCAT digital phantom as they represent the lung at end inhale and end exhale, respectively. The dataset of Phase one is the basic regularly-sampled volume while the dataset of Phase four is deformed from that of Phase one, and resampled to a regularly sampled dataset for the ray tracing method. NCC between splatting and ray tracing DRRs are 0.9980 and 0.9977 for Phase one and Phase four, respectively. The calculation speed of the splatting method is 3 times faster than that of ray tracing. CONCLUSIONS Our splatting approach can generate high-quality DRRs efficiently, and is a good alternative for current DRR generation techniques for deformed volume datasets. This research is supported by CPRIT Individual Investigator Award RP110329.
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Arhjoul L, Jinag L, Solberg T, Despres P, Mao W. TH-F-211-04: A Fast Finite Size Pencil Beam Algorithm for Dose Calculation Using GPUs. Med Phys 2012. [DOI: 10.1118/1.4736400] [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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107
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Mao W, Jiang L, Arhjoul L, Foster R, Solberg T. SU-E-J-127: An Initial Application of Evaluating Lung Tumor Motion Throughout Radiotherapy. Med Phys 2012; 39:3681. [PMID: 28518894 DOI: 10.1118/1.4734963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE We present a novel method for evaluating lung tumor motion incorporating planning CT scan, imaging for patient localization, and during treatment delivery. METHODS Tumor motion is evaluated at three stages of the treatment process. Following the acquisition of 4D CT scans for treatment planning, tumors are contoured at one phase and registered to other phases to obtain tumor motion patterns. Tumor motion prior to each treatment is evaluated by identifying tumors directly on every raw projection of the daily localization CBCT scans. Finally, tumor motion during treatment is evaluated by analyzing MV treatment beam images. Every frame of image is evaluated as three components, each with separate DRRs: all non-moving structures, the tumor, and other moving structures. The locations of three components are determined though a registration process. In order to quantify tumor motion, the cumulated probability, the percentage of time when the tumor motion is equal to or smaller than a given range, is evaluated at every stage. RESULTS This methodology has been applied to five lung cancer patients undergoing radiotherapy. More than 5400 frames from MV treatment beam images and 24 CBCT scans were acquired from 12 fractions. Both the average tumor position and the cumulated probability with the range were evaluated. The tumor motion ranges are generally larger than those obtained from 4D CT. Significant variation in motion patterns was observed as well. CONCLUSIONS Information obtained from 4DCT is insufficient for motion assessment. In contrast, our novel methodology is capable of accurately characterizing lung tumor motion on a daily basis, without the need for implanted fiducial markers and without additional imaging dose. It provides daily verification that the tumor range is within prior estimates and covered by the treatment planning volume. This research is supported by CPRIT Individual Investigator Award RP110329.
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108
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Mao W, Gratch J. Modeling Social Causality and Responsibility Judgment in Multi-Agent Interactions. J ARTIF INTELL RES 2012. [DOI: 10.1613/jair.3526] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Social causality is the inference an entity makes about the social behavior of other entities and self. Besides physical cause and effect, social causality involves reasoning about epistemic states of agents and coercive circumstances. Based on such inference, responsibility judgment is the process whereby one singles out individuals to assign responsibility, credit or blame for multi-agent activities. Social causality and responsibility judgment are a key aspect of social intelligence, and a model for them facilitates the design and development of a variety of multi-agent interactive systems. Based on psychological attribution theory, this paper presents a domain-independent computational model to automate social inference and judgment process according to an agents causal knowledge and observations of interaction. We conduct experimental studies to empirically validate the computational model. The experimental results show that our model predicts human judgments of social attributions and makes inferences consistent with what most people do in their judgments. Therefore, the proposed model can be generically incorporated into an intelligent system to augment its social and cognitive functionality.
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Mao W, Oshima Y, Yamanaka Y, Fukuoka M, Sakai N. Mathematical simulation of liquid food pasteurization using far infrared radiation heating equipment. J FOOD ENG 2011. [DOI: 10.1016/j.jfoodeng.2011.05.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Zhang L, Liu S, Ji H, Zhang C, Deng C, Cao W, Mao W, Gao J. Inactivation of polyphenol oxidase from Pacific white shrimp by dense phase carbon dioxide. INNOV FOOD SCI EMERG 2011. [DOI: 10.1016/j.ifset.2011.05.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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111
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Mao W, Solberg T. TU-G-BRC-03: A Novel Markerless Technique for Real-Time Lung Tumor Tracking. Med Phys 2011. [DOI: 10.1118/1.3613232] [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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112
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Mao W, Xu Y, Liu J, Ma S, Zhou X, Chen Q, Zheng X, Du X. Pattern of recurrence after curative surgery in thoracic esophageal squamous cell carcinoma: A 6-year experience with 1,020 patients. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e14557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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113
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Fan Q, Fu J, Zhu Y, Mao W, Zhao P, Tian Y. The prognostic factors in cervical carcinoma treated by radical hysterectomy combined with pelvic radiotherapy. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e15584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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114
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Yang Y, Zhong Z, Guo X, Anderson J, Solberg T, Mao W. A Novel Markerless Technique to Evaluate Daily Lung Tumor Motion. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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115
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Jain S, Edwards M, Boike T, Anderson J, Rule W, Mao W, Ding C, Solberg T. Dosimetric Comparison of Single Fraction SBRT for Spinal Metastases using Linac-based IMRT vs. CyberKnife. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1840] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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116
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Mao W, Wei L, Tang Y, Li Y. P27-3 The Granger Causality changes in the EEG with depression in response to different facial expressions. Clin Neurophysiol 2010. [DOI: 10.1016/s1388-2457(10)61077-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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117
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Mao W, Wang J, Foster R, Song K, Solberg T. SU-GG-J-21: Direct Investigation of Geometric Coincidence among Calypso System, Onboard KV Imaging, and MV Treatment Beam Imaging. Med Phys 2010. [DOI: 10.1118/1.3468245] [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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118
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Huang L, Papiez L, Papiez E, Solberg T, Mao W, Ding C, Timmerman R. SU-GG-J-56: Can Four Dimensional Cone Beam Computed Tomography (4DCBCT) Improve the Patient Setup for Stereotactic Body Radiation Therapy. Med Phys 2010. [DOI: 10.1118/1.3468280] [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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119
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Wang J, Mao W, Solberg T. WE-E-201B-08: A Novel Scatter Correction Scheme for Cone-Beam Computed Tomography Using Moving 1D Blocker Strips. Med Phys 2010. [DOI: 10.1118/1.3469454] [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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120
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Mao W, Xu Y, JI Y, Sun X, Jiang H, Zhao P, Cheng J, Du X. The patterns of tumor locoregional recurrence in thoracic esophageal squamous cell carcinoma after curative surgery. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e14613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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121
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Wang X, Sun W, Zhu X, Li L, Du T, Mao W, Wu X, Wei H, Zhu S, Sun Y, Liu Y, Niu N, Wang Y, Liu Y. Paroxysmal kinesigenic choreoathetosis: evidence of linkage to the pericentromeric region of chromosome 16 in four Chinese families. Eur J Neurol 2010; 17:800-7. [PMID: 20158512 DOI: 10.1111/j.1468-1331.2009.02929.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Paroxysmal kinesigenic choreoathetosis (PKC) is an autosomal dominant condition characterized by abnormal involuntary movements precipitated by sudden movement. The pericentromeric region of chromosome 16 has been linked to PKC by several reports. This study was to localize and identify PKC gene in four Chinese PKC families. METHODS Genetic linkage mapping with eight markers spanning chromosome 16p12-q13 was performed in 43 family members. Genome-wide single nucleotide polymorphism (SNP) scans were performed on four individuals in Family 1 in which infantile convulsion (IC) was co-inherited with PKC. RESULTS Individuals in Family 1 presented with both IC and paroxysmal choreoathetosis (ICCA), and Families 2, 3, and 4 presented only with PKC. Evidence for linkage was found with a maximum two-point LOD score of 4.89 for D16S690 (theta = 0.0) and a maximum multipoint LOD score was 5.34 between D16S3080 and D16S3136. Haplotype analysis showed the disease locus was between D16S3093 and D16S3057. A total of 84 SNPs spanned on 16q12.1-q13 was not segregated with the PKC phenotype, which defined an unlinked region from rs9933187 to rs8044753. Thus, the critical region of the PKC gene is across the pericentromeric region of chromosome 16, and most likely maps to a region of 20.5 Mb (6.2 cM) between D16S3093 and rs9933187 (16p11.2-q12.1). CONCLUSION The assignment of the locus for PKC to the pericentromeric region of chromosome 16 is confirmed and putatively narrowed in the present study.
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Anderson J, Heinzerling J, Mao W, Papiez L, Abdulrahman R, Choy H, Solberg T, Timmerman R. 4D Cone Beam CT to Assess Daily Variation of Respiratory Motion after Abdominal Compression in Lung SBRT. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1451] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Du X, Zhu B, Hu G, Mao W, Wang S, Zhang H, Wang F, Shi Z. U-shape association between white blood cell count and the risk of diabetes in young Chinese adults. Diabet Med 2009; 26:955-60. [PMID: 19900225 DOI: 10.1111/j.1464-5491.2009.02801.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND Chronic low-grade inflammation is related to diabetes risk in population studies. Elevated levels of white blood cells (WBC) were related to the risk of diabetes in cross-sectional studies in the Chinese population. The objective of the study is to assess the prospective association between WBC and the risk of diabetes in the Chinese population. METHODS We examined 7445 manual workers aged 18-59 years free from diabetes at baseline. Fasting glucose concentrations and white cell count were measured at annual health examinations from 1997 to 2007. Anthropometric measurements were taken by health workers. In the present study, each participant had at least two measurements of fasting blood glucose. RESULTS During a mean of 4.94 years follow-up, 178 participants developed diabetes. After controlling for known risk factors for diabetes (age, gender, smoking, drinking, parental history of diabetes, body mass index, systolic blood pressure, hepatitis B surface antigen and liver function), a U-shaped association between WBC count and diabetes was found. The hazard ratios (HR) of diabetes across quartiles of WBC count were 1.87 (95% CI 1.15-3.05), 1.00, 1.46 (0.88-2.42) and 2.04 (1.28-3.25). The association was stronger among non-smokers: compared with the second quartile, the HR of diabetes for the first and fourth quartiles of WBC were 3.00 (1.28-7.03) and 3.16 (1.33-7.53). Adjusting for hepatitis B virus infection and liver function did not change the association. CONCLUSION Both low and high levels of WBC count were associated with an increased risk of diabetes in young workers.
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Speiser M, Medin P, Mao W, Papiez L, Gum F, Solberg T. PRELMINARY CHARACTERIZATION OF A DEDICATED IMAGE-GUIDED SBRT SYSTEM. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)72890-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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125
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Mao W, Foster R, Solberg T. SU-FF-J-29: Accuracy Evaluation of Using MV EPID and / Or Integrated KV Imaging System to Locate 3D Positions of Internal Fiducial Markers by a Calypso System. Med Phys 2009. [DOI: 10.1118/1.3181321] [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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126
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Mao W, Speiser M, Medin P, Papiez L, Solberg T, Xing L. SU-FF-J-44: Application of a Routine Geometric QA Tool for Integrated MV and KV Imaging Systems On Trilogy, Synergy, and Vero. Med Phys 2009. [DOI: 10.1118/1.3181336] [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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127
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Liu W, Wiersma RD, Mao W, Luxton G, Xing L. Real-time 3D internal marker tracking during arc radiotherapy by the use of combined MV-kV imaging. Phys Med Biol 2008; 53:7197-213. [PMID: 19043177 DOI: 10.1088/0031-9155/53/24/013] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
To minimize the adverse dosimetric effect caused by tumor motion, it is desirable to have real-time knowledge of the tumor position throughout the beam delivery process. A promising technique to realize the real-time image guided scheme in external beam radiation therapy is through the combined use of MV and onboard kV beam imaging. The success of this MV-kV triangulation approach for fixed-gantry radiation therapy has been demonstrated. With the increasing acceptance of modern arc radiotherapy in the clinics, a timely and clinically important question is whether the image guidance strategy can be extended to arc therapy to provide the urgently needed real-time tumor motion information. While conceptually feasible, there are a number of theoretical and practical issues specific to the arc delivery that need to be resolved before clinical implementation. The purpose of this work is to establish a robust procedure of system calibration for combined MV and kV imaging for internal marker tracking during arc delivery and to demonstrate the feasibility and accuracy of the technique. A commercially available LINAC equipped with an onboard kV imager and electronic portal imaging device (EPID) was used for the study. A custom built phantom with multiple ball bearings was used to calibrate the stereoscopic MV-kV imaging system to provide the transformation parameters from imaging pixels to 3D world coordinates. The accuracy of the fiducial tracking system was examined using a 4D motion phantom capable of moving in accordance with a pre-programmed trajectory. Overall, spatial accuracy of MV-kV fiducial tracking during the arc delivery process for normal adult breathing amplitude and period was found to be better than 1 mm. For fast motion, the results depended on the imaging frame rates. The RMS error ranged from approximately 0.5 mm for the normal adult breathing pattern to approximately 1.5 mm for more extreme cases with a low imaging frame rate of 3.4 Hz. In general, highly accurate real-time tracking of implanted markers using hybrid MV-kV imaging is achievable and the technique should be useful to improve the beam targeting accuracy of arc therapy.
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Mao W, Riaz N, Lee L, Wiersma R, Xing L. Four Clinical Issues of Tracking Multiple Moving Fiducials in Real-time based On Simultaneous Onboard kV and Treatment MV Imaging. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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129
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Dua N, Mao W, Lee L, Riaz N, Wiersma R, Hsu A, Luxton G, King C, Xing L. Using MV Treatment Beam Imaging to Monitor Prostate Motion in Near Real-time on a Conventional LINAC. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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130
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Wiersma R, Mao W, Xing L. Real-time Tracking of Implanted Fiducial Markers using Combined Onboard kV Fluoroscopy and MV EPID Imaging. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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131
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Xing L, Lee L, Mao W. IMRT Dose Reconstruction using Cone-beam CT and EPID-measured Leaf Sequence Files. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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132
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Riaz N, Agram P, Gudmundsson O, Wiersma R, Mao W, Xing L. Predicting Fiducial Motion in Respiratory Tumors for Image Guided Radiotherapy. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Yamanaka T, Kuribayashi T, Mao HK, Hemley R, Shu J, Liermann H, Yang W, Xiao YM, Dera P, Mao W. Ferroelectric and high–low spin transition by MEM using single-crystal and X-ray emission to 100 Gpa. Acta Crystallogr A 2008. [DOI: 10.1107/s010876730808046x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Riaz N, Wiersma R, Mao W, Xing L. TH-C-AUD C-07: Prediction of Fiducial Motion in Respiratory Tumors for Image-Guided Radiotherapy. Med Phys 2008. [DOI: 10.1118/1.2962853] [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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135
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Mao W, Riaz N, Lee K, Wiersma R, King C, Hsu A, Luxton G, Xing L. SU-DD-A3-03: Using Treatment Beam Imaging to Monitor Prostate Motion In Near Real-Time On a Conventional LINAC. Med Phys 2008. [DOI: 10.1118/1.2961364] [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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136
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Liu W, Mao W, Hsu A, Xing L. SU-GG-J-07: A Complete QA System to Locate Accurate Positions of X-Ray Source and Detector at Any Rotation Angle for MV Or KV Machine. Med Phys 2008. [DOI: 10.1118/1.2961564] [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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137
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Riaz N, Mao W, Wiersma R, Xing L. TU-FF-A3-06: Improving Tracking of Implanted Radio-Opaque Markers On MV and KV Imaging with Techniques From Computer Vision and Machine Learning. Med Phys 2008. [DOI: 10.1118/1.2962655] [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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138
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Lee K, Mao W, Xing L. WE-D-AUD B-05: The Use of EPID-Measured Leaf Sequence Files and On-Treatment Cone-Beam CT for Dose Reconstruction of IMRT Delivery. Med Phys 2008. [DOI: 10.1118/1.2962737] [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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139
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Liu W, Mao W, Wiersma R, Luxton G, Riaz N, Xing L. TH-C-AUD C-06: Nearly Real-Time Tumor-Position Monitoring During Arc Therapy with Combined MV and KV Imaging. Med Phys 2008. [DOI: 10.1118/1.2962852] [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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Wiersma R, Mao W, Riaz N, Xing L. SU-DD-A3-02: Real-Time Tracking of Implanted Fiducial Markers Using Combined KV and MV Imaging. Med Phys 2008. [DOI: 10.1118/1.2961363] [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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141
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Mao W, Riaz N, Lee K, Wiersma R, Xing L. WE-C-351-06: Tracking Multiple Moving Fiducials During Treatment Based On Simultaneous Onboard KV and Treatment MV Imaging. Med Phys 2008. [DOI: 10.1118/1.2962713] [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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Wiersma R, Riaz N, Mao W, Xing L. SU-GG-J-194: Use of Synchronized Beam Switching for Real-Time 3D KV-MV Internal Marker Tracking with Step-And-Shoot IMRT. Med Phys 2008. [DOI: 10.1118/1.2961743] [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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Mao W, Wiersma RD, Xing L. Fast internal marker tracking algorithm for onboard MV and kV imaging systems. Med Phys 2008; 35:1942-9. [PMID: 18561670 PMCID: PMC2809731 DOI: 10.1118/1.2905225] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Revised: 01/31/2008] [Accepted: 02/26/2008] [Indexed: 11/07/2022] Open
Abstract
Intrafraction organ motion can limit the advantage of highly conformal dose techniques such as intensity modulated radiation therapy (IMRT) due to target position uncertainty. To ensure high accuracy in beam targeting, real-time knowledge of the target location is highly desired throughout the beam delivery process. This knowledge can be gained through imaging of internally implanted radio-opaque markers with fluoroscopic or electronic portal imaging devices (EPID). In the case of MV based images, marker detection can be problematic due to the significantly lower contrast between different materials in comparison to their kV-based counterparts. This work presents a fully automated algorithm capable of detecting implanted metallic markers in both kV and MV images with high consistency. Using prior CT information, the algorithm predefines the volumetric search space without manual region-of-interest (ROI) selection by the user. Depending on the template selected, both spherical and cylindrical markers can be detected. Multiple markers can be simultaneously tracked without indexing confusion. Phantom studies show detection success rates of 100% for both kV and MV image data. In addition, application of the algorithm to real patient image data results in successful detection of all implanted markers for MV images. Near real-time operational speeds of approximately 10 frames/sec for the detection of five markers in a 1024 x 768 image are accomplished using an ordinary PC workstation.
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144
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Mao W, Xing L. Design of Multi-Purpose Phantom and Automated Software Analysis Tool for Quality Assurance of Onboard kV/MV Imaging System. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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145
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Mao W, Schuler MA, Berenbaum MR. Cytochrome P450s in Papilio multicaudatus and the transition from oligophagy to polyphagy in the Papilionidae. INSECT MOLECULAR BIOLOGY 2007; 16:481-90. [PMID: 17651237 DOI: 10.1111/j.1365-2583.2007.00741.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Although substrate-specific CYP6B1 and CYP6B3 enzymes in Papilio polyxenes contribute to specialization on furanocoumarin-containing host plants, CYP6B4 and CYP6B17 enzymes in the polyphagous Papilio glaucus and Papilio canadensis have a broader range of substrates. Papilio multicaudatus, an oligophage with one furanocoumarin-containing host, is putatively ancestral to polyphagous Papilio species. Furanocoumarin-inducible CYP6B33-CYP6B37 and CYP6AB6 were characterized from this species. Heterologous expression of CYP6B33 revealed furanocoumarin metabolism resembling that of CYP6B4-CYP6B17 enzymes from P. glaucus and P. canadensis. Molecular models of CYP6B33 and CYP6B4 indicate that seven conserved aromatic side chains stabilize their hydrophobic catalytic sites and that a Lys484-Ser484 substitution enlarges the CYP6B4 active site pocket to increase the predicted distance between the substrate and reactive oxygen relative to CYP6B1. Loss of specialization in this lineage may have resulted from relatively few mutational changes, allowing acquisition of broader catalytic activities without loss of ancestral furanocoumarin-metabolizing activities.
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146
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Mao W, Li T, Wink N, Xing L. TH-D-M100J-07: CT Image Registration in Sinogram Space. Med Phys 2007. [DOI: 10.1118/1.2761716] [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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147
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Mao W, Xing L. TH-D-M100J-05: A Phantom and Software Analysis Tool for Quality Assurance (QA) of LINAC with Onboard KV X-Ray Imaging Device. Med Phys 2007. [DOI: 10.1118/1.2761714] [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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148
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Wen XF, Yang G, Mao W, Thornton A, Liu J, Bast RC, Le XF. HER2 signaling modulates the equilibrium between pro- and antiangiogenic factors via distinct pathways: implications for HER2-targeted antibody therapy. Oncogene 2006; 25:6986-96. [PMID: 16715132 DOI: 10.1038/sj.onc.1209685] [Citation(s) in RCA: 129] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We determined the impact of HER2 signaling on two proangiogenic factors, vascular endothelial growth factor (VEGF) and interleukin-8 (IL-8), and on an antiangiogenic factor, thrombospondin-1 (TSP-1). Re-expression of HER2 in MCF-7 and T-47D breast cancer cells that endogenously express low levels of HER2 resulted in elevated expression of VEGF and IL-8 and decreased expression of TSP-1. Inhibition of HER2 with a humanized anti-HER2 antibody (trastuzumab, or Herceptin) or a retrovirus-mediated small interfering RNA against HER2 (siHER2) decreased VEGF and IL-8 expression, but increased TSP-1 expression in BT474 breast cancer cells that express high levels of HER2. These in vitro results were further evaluated by treatment of BT474 xenografts in immunosuppressed mice with trastuzumab. Trastuzumab inhibited growth of BT474 xenografts and decreased microvascular density associated with downregulation of VEGF and IL-8 and with upregulation of TSP-1 expression. Inhibiting the PI3K-AKT pathway decreased VEGF and IL-8 expression. AKT1 overexpession increased VEGF and IL-8 expression, but did not increase TSP-1 expression. A p38 kinase inhibitor, SB203580, instead blocked TSP-1 expression and a p38 activator, MKK6, increased TSP-1 expression. Trastuzumab stimulated sustained p38 activation and SB203580 attenuated the TSP-1 upregulation induced by trastuzumab. HER2 signaling therefore influences the equilibrium between pro- and antiangiogenic factors via distinct signaling pathways. Trastuzumab inhibits angiogenesis and tumor growth, at least in part, through activation of the HER2-p38-TSP-1 pathway and inhibition of the HER2-PI3K-AKT-VEGF/IL-8 pathway.
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MESH Headings
- Animals
- Antibodies, Monoclonal/pharmacology
- Antibodies, Monoclonal, Humanized
- Antineoplastic Agents/pharmacology
- Blotting, Western
- Female
- Humans
- Immunohistochemistry
- Interleukin-8/metabolism
- Mammary Neoplasms, Experimental/blood supply
- Mammary Neoplasms, Experimental/drug therapy
- Mammary Neoplasms, Experimental/metabolism
- Mice
- Mice, Nude
- Neovascularization, Pathologic/metabolism
- Oncogene Protein v-akt/metabolism
- Phosphatidylinositol 3-Kinases/metabolism
- Receptor, ErbB-2/antagonists & inhibitors
- Receptor, ErbB-2/immunology
- Receptor, ErbB-2/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Signal Transduction/drug effects
- Signal Transduction/physiology
- Thrombospondin 1/metabolism
- Transfection
- Trastuzumab
- Vascular Endothelial Growth Factor A/metabolism
- p38 Mitogen-Activated Protein Kinases/drug effects
- p38 Mitogen-Activated Protein Kinases/metabolism
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149
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Mao W, Rupasinghe S, Zangerl AR, Schuler MA, Berenbaum MR. Remarkable substrate-specificity of CYP6AB3 in Depressaria pastinacella, a highly specialized caterpillar. INSECT MOLECULAR BIOLOGY 2006; 15:169-79. [PMID: 16640727 DOI: 10.1111/j.1365-2583.2006.00623.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The parsnip webworm, Depressaria pastinacella, a specialist on two genera in Apiaceae, feeds exclusively on the furanocoumarin-containing reproductive structures of its host plants. This caterpillar relies principally on cytochrome P450-mediated detoxification for coping with the high concentrations of furanocoumarins in its diet. A cDNA encoding the furanocoumarin-inducible P450 CYP6AB3 from this species was coexpressed with house-fly NADPH P450 reductase in baculovirus-infected Sf9 cells and tested for binding and metabolism of the six furanocoumarins typically encountered in host plant tissues. Only imperatorin and bergapten bind in close proximity to the catalytic haem and only imperatorin is metabolized (V(max) and K(m) of 2.412 pmol/min per pmol P450 and 94.28 microm, respectively). Purification of the imperatorin metabolite by normal phase HPLC and characterization of its structure by MS-MS analysis indicate that CYP6AB3 initially epoxidizes the carbon-carbon pi-bond on the isoprenyl side chain on imperatorin. An improved molecular model for the CYP6AB3 protein based on this biochemical characterization and the recently defined mammalian CYP3A4 crystal structure provides insight into the remarkable substrate specificity of this protein.
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150
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Mao W, Watanabe M, Sakai N. Analysis of temperature distributions in Kamaboko during microwave heating. J FOOD ENG 2005. [DOI: 10.1016/j.jfoodeng.2004.10.045] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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