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Zhang Q, Driewer J, Wang S, Li S, Zhu X, Zheng D, Cao Y, Zhang J, Jamshidi A, Cox BW, Knisely JPS, Potters L, Klein EE. Accuracy evaluation of a six-degree-of-freedom couch using cone beam CT and IsoCal phantom with an in-house algorithm. Med Phys 2017; 44:3888-3898. [PMID: 28500790 DOI: 10.1002/mp.12342] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 04/24/2017] [Accepted: 05/03/2017] [Indexed: 12/25/2022] Open
Abstract
PURPOSE The accuracy of a six degree of freedom (6DoF) couch was evaluated using a novel method. METHODS Cone beam CT (CBCT) images of a 3D phantom (IsoCal) were acquired with different, known combinations of couch pitch and roll angles. Pitch and roll angles between the maximum allowable values of 357 and 3 degrees were tested in one degree increments. A total of 49 combinations were tested at 0 degrees of yaw (couch rotation angle). The 3D positions of 16 tungsten carbide ball bearings (BBs), each 4 mm in diameter and arranged in a known geometry within the IsoCal phantom, were determined in the 49 image sets with in-house software. The BB positions at different rotation angles were determined using a rotation matrix from the original BB positions at zero pitch and roll angles. A linear least squares fit method estimated the rotation angles and differences between detected and nominal rotation angles were calculated. This study was conducted for the case with and without extra weight on the couch. Couch walk shifts for the system were investigated using eight combinations of rotation, roll and pitch. RESULTS A total of 49 CBCT images with voxel sizes 0.5 × 0.5 × 1.0 mm3 were taken for the case without extra weight on the couch. The 16 BBs were determined to evaluate the isocenter translation and rotation differences between the calculated and nominal couch values. Among all 49 calculations, the maximum rotation angle differences were 0.10 degrees for pitch, 0.15 degrees for roll and 0.09 degrees for yaw. The corresponding mean and standard deviation values were 0.028 ± 0.032, -0.043 ± 0.058, and -0.009 ± 0.033 degrees. The maximum translation differences were 0.3 mm in the left-right direction, 0.5 mm in the anterior-posterior direction and 0.4 mm in the superior-inferior direction. The mean values and corresponding standard deviations were 0.07 ± 0.12, -0.05 ± 0.25, and -0.12±0.14 mm for the planes described above. With an 80 kg phantom on the couch, the maximum translation shift was 0.69 mm. The couch walk translation shifts were less than 0.1 mm and rotation shifts were less than 0.1 degree. CONCLUSIONS Errors of a new 6DoF couch were tested using CBCT images of a 3D phantom. The rotation errors were less than 0.3 degree and the translation errors were less than or equal to 0.8 mm in each direction. This level of accuracy is warranted for clinical radiotherapy utilization including stereotactic radiosurgery.
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Affiliation(s)
- Qinghui Zhang
- Department of Radiation Medicine, Northwell Health and Hofstra Northwell School of Medicine, New York, NY, 11042, USA
| | - Joseph Driewer
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Shuo Wang
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Sicong Li
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Xiaofeng Zhu
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Dandan Zheng
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Yijian Cao
- Department of Radiation Medicine, Northwell Health and Hofstra Northwell School of Medicine, New York, NY, 11042, USA
| | - Jiaju Zhang
- Department of Radiation Medicine, Northwell Health and Hofstra Northwell School of Medicine, New York, NY, 11042, USA
| | - Abolghassem Jamshidi
- Department of Radiation Medicine, Northwell Health and Hofstra Northwell School of Medicine, New York, NY, 11042, USA
| | - Brett W Cox
- Department of Radiation Medicine, Northwell Health and Hofstra Northwell School of Medicine, New York, NY, 11042, USA
| | - Jonathan P S Knisely
- Department of Radiation Medicine, Northwell Health and Hofstra Northwell School of Medicine, New York, NY, 11042, USA
| | - Louis Potters
- Department of Radiation Medicine, Northwell Health and Hofstra Northwell School of Medicine, New York, NY, 11042, USA
| | - Eric E Klein
- Department of Radiation Medicine, Northwell Health and Hofstra Northwell School of Medicine, New York, NY, 11042, USA
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Zvolanek K, Ma R, Zhou C, Liang X, Wang S, Verma V, Zhu X, Zhang Q, Driewer J, Lin C, Zhen W, Wahl A, Zhou SM, Zheng D. Still equivalent for dose calculation in the Monte Carlo era? A comparison of free breathing and average intensity projection CT datasets for lung SBRT using three generations of dose calculation algorithms. Med Phys 2017; 44:1939-1947. [DOI: 10.1002/mp.12193] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 02/20/2017] [Accepted: 02/27/2017] [Indexed: 01/26/2023] Open
Affiliation(s)
- Kristina Zvolanek
- Department of Biological Systems Engineering; University of Nebraska-Lincoln; Lincoln NE 68588 USA
| | - Rongtao Ma
- Department of Radiation Oncology; University of Nebraska Medical Center; Omaha NE 68198 USA
| | - Christina Zhou
- School of Biological Sciences; University of Chicago; Chicago IL 60637 USA
| | - Xiaoying Liang
- University of Florida Health Proton Therapy Institute; Jacksonville FL 32206 USA
| | - Shuo Wang
- Department of Radiation Oncology; University of Nebraska Medical Center; Omaha NE 68198 USA
| | - Vivek Verma
- Department of Radiation Oncology; University of Nebraska Medical Center; Omaha NE 68198 USA
| | - Xiaofeng Zhu
- Department of Radiation Oncology; Georgetown University Hospital; Washington DC 20007 USA
| | - Qinghui Zhang
- Department of Radiation Medicine; Northwell Health; New York NY 10040 USA
| | - Joseph Driewer
- Department of Radiation Oncology; Nebraska Methodist Hospital; Omaha NE 68114 USA
| | - Chi Lin
- Department of Radiation Oncology; University of Nebraska Medical Center; Omaha NE 68198 USA
| | - Weining Zhen
- Department of Radiation Oncology; University of Nebraska Medical Center; Omaha NE 68198 USA
| | - Andrew Wahl
- Department of Radiation Oncology; University of Nebraska Medical Center; Omaha NE 68198 USA
| | - Su-Min Zhou
- Department of Radiation Oncology; University of Nebraska Medical Center; Omaha NE 68198 USA
| | - Dandan Zheng
- Department of Radiation Oncology; University of Nebraska Medical Center; Omaha NE 68198 USA
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Zhu X, Driewer J, Li S, Verma V, Lei Y, Zhang M, Zhang Q, Zheng D, Cullip T, Chang SX, Wang AZ, Zhou S, Enke CA. Technical Note: Fabricating Cerrobend grids with 3D printing for spatially modulated radiation therapy: A feasibility study. Med Phys 2016; 42:6269-73. [PMID: 26520719 DOI: 10.1118/1.4932223] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
PURPOSE Grid therapy has promising applications in the radiation treatment of large tumors. However, research and applications of grid therapy are limited by the accessibility of the specialized blocks that produce the grid of pencil-like radiation beams. In this study, a Cerrobend grid block was fabricated using the 3D printing technique. METHODS A grid block mold was designed with flared tubes which follow the divergence of the beam. The mold was 3D printed using a resin with the working temperature below 230 °C. The melted Cerrobend liquid at 120 °C was cast into the resin mold to yield a block with a thickness of 7.4 cm. At the isocenter plane, the grid had a hexagonal pattern, with each pencil beam diameter of 1.4 cm; the distance between the beam centers was 2.1 cm. RESULTS The dosimetric properties of the grid block were studied using small field dosimeters: a pinpoint ionization chamber and a stereotactic diode. For a 6 MV photon beam, its valley-to-peak ratio was 20% at dmax and 30% at 10 cm depth; the output factor was 84.9% at dmax and 65.1% at 10 cm depth. CONCLUSIONS This study demonstrates that it is feasible to implement 3D printing technique in applying grid therapy in clinic.
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Affiliation(s)
- Xiaofeng Zhu
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
| | - Joseph Driewer
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
| | - Sicong Li
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
| | - Vivek Verma
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
| | - Yu Lei
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
| | - Mutian Zhang
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
| | - Qinghui Zhang
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
| | - Dandan Zheng
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
| | - Timothy Cullip
- Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514
| | - Sha X Chang
- Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514
| | - Andrew Z Wang
- Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514
| | - Sumin Zhou
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
| | - Charles A Enke
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska 68154
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Halabi T, Lu HM, Bernard DA, Chu JCH, Kirk MC, Hamilton RJ, Lei Y, Driewer J. Automated survey of 8000 plan checks at eight facilities. Med Phys 2016; 43:4966. [DOI: 10.1118/1.4959999] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zhu X, Cai J, Lian J, Driewer J, Chang S, Li S, Verma V, Lei Y, Wang S, Zheng D, Zhang M, Zhang Q, Zhou S, Enke C. A Touchless Tool to Improve Gated Radiation Therapy: Thermal Camera Based Breathing Phase Monitoring. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bennion N, Driewer J, Jacobs K, Poole M, McMahon R, Wilson K, Denniston K, Zhen W, Yager A, Enke C. SU-E-T-452: Identifying Inefficiencies in Radiation Oncology Workflow and Prioritizing Solutions for Process Improvement and Patient Safety. Med Phys 2015. [DOI: 10.1118/1.4924814] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zhou S, Zhu X, Zhang M, Zheng D, Zhang Q, Lei Y, Li S, Driewer J, Wang S, Enke C. SU-E-T-56: A Novel Approach to Computing Expected Value and Variance of Point Dose From Non-Gated Radiotherapy Delivery. Med Phys 2015. [DOI: 10.1118/1.4924417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zhou S, Zhu X, Zhang M, Zheng D, Lei Y, Zhang Q, Li S, Driewer J, Wang S, Enke C. SU-E-T-508: Internal Organ Motion Effect On Radiation Dose to a Point Under Half-Beam Block Match Line. Med Phys 2015. [DOI: 10.1118/1.4924870] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zheng D, Zhen W, Lei Y, Denniston K, Driewer J, Zhang Q, Zhu X, Wang S, Zhou S. SU-E-J-180: Imaging-Based ITV May Provide Insufficient Internal Margin for Lung SBRT Patients with Tumor Misalignments Between 3D and 4D Planning CTs. Med Phys 2015. [DOI: 10.1118/1.4924265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Driewer J, Burchell M, Fowler Z, Lei Y, Morgan B, Zheng D, Zhou S. MO-DE-BRA-01: Enhancing Radiation Physics Instruction Through Gamification and E-Learning. Med Phys 2015. [DOI: 10.1118/1.4925336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Lei Y, Zheng D, Wang S, Zhu X, Zhang Q, Li S, Driewer J, Zhou S. SU-E-T-440: Gain Calibration Stability Study of a MV Flat-Panel-Detector (FPD) On Siemens ARTISTE Linac. Med Phys 2015. [DOI: 10.1118/1.4924801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zhu X, Driewer J, Lei Y, Zheng D, Li S, Cullip T, Chang S, Zhang Q, Zhang M, Zhou S. SU-E-T-419: Fabricating Cerrobend Grids with 3D Printing for Spatially Modulated Radiation Therapy: A Feasibility Study. Med Phys 2015. [DOI: 10.1118/1.4924780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zhang Q, Driewer J, Wang S, Li S, Zheng D, Zhu X, Zhen W, Wahl A, Lin C, Thompson R, Zhou S, Enke C. SU-E-J-46: Evaluation of the Accuracy of a Six Degree of Freedom Robotic Couch Using ConeBeam CT Images of the Isocal Phantom. Med Phys 2015. [DOI: 10.1118/1.4924133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Wang S, Driewer J, Zheng D, Lei Y, Zhang Q, Zhu X, Li S, Enke C, Xu B, Zhou S. SU-E-T-460: Impact of the LINAC Repetition Rate On a High-Resolution Liquid Ionization Chamber Array for Patient-Specific QA. Med Phys 2015. [DOI: 10.1118/1.4924822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Mazur T, Xiao Z, Driewer J, Wang Y, Li H. WE-AB-BRB-05: Toward a 2D Water-Equivalent Dosimetry Panel Using KCl:Eu2+. Med Phys 2015. [DOI: 10.1118/1.4925846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zhang Q, Zheng D, Lei Y, Morgan B, Driewer J, Zhang M, Li S, Zhou S, Zhen W, Thompson R, Wahl A, Lin C, Enke C. A new variable for SRS plan quality evaluation based on normal tissue sparing: the effect of prescription isodose levels. Br J Radiol 2014; 87:20140362. [PMID: 25226047 DOI: 10.1259/bjr.20140362] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE A new dosimetric variable, dose-dropping speed (DDS), was proposed and used to evaluate normal tissue sparing among stereotactic radiosurgery (SRS) plans with different prescription isodose lines. METHODS 40 plans were generated for 8 intracranial SRS cases, prescribing to isodose levels (IDLs) ranging from 50% to 90% in 10% increments. Whilst maintaining similar coverage and conformity, plans at different IDLs were evaluated in terms of normal tissue sparing using the proposed DDS. The DDS was defined as the greater decay coefficient in a double exponential decay fit of the dose drop-off outside the planning target volume (PTV), which models the steep portion of the drop-off. Provided that the prescription dose covers the whole PTV, a greater DDS indicates better normal tissue sparing. RESULTS Among all plans, the DDS was found to be the lowest for the prescription at 90% IDL and the highest for the prescription at 60% or 70%. The beam profile slope change in the penumbra and its field size dependence were explored and given as the physical basis of the findings. CONCLUSION A variable was proposed for SRS plan quality evaluation. Using this measure, prescriptions at 60% and 70% IDLs were found to provide best normal tissue sparing. ADVANCES IN KNOWLEDGE A new variable was proposed based on which normal tissue sparing was quantitatively evaluated, comparing different prescription IDLs in SRS.
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Affiliation(s)
- Q Zhang
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE, USA
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Zhang Q, Zheng D, Lei Y, Driewer J, Morgan B, Zhang M, Li S, Zhou S, Zhen W, Thompson R, Wahl A, Lin C, Enke C. Dosimetric Effect of Prescription Isodose Line Selection on Normal Tissues in SRS and SRT Treatment Planning. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Zheng D, Gan H, Zhen W, Lin C, Driewer J, Wahl A, Zhou S. Is PTV Still Appropriate for Prescription Specification in Monte Carlo SBRT Lung Planning? Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Driewer J. Encyclopaedia of Medical Physics (2 volumes). Med Phys 2014. [DOI: 10.1118/1.4890755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Li H, Driewer J, Han Z, Low D, Yang D, Xiao Z. TH-C-19A-12: Two-Dimensional High Spatial-Resolution Dosimeter Using Europium Doped Potassium Chloride. Med Phys 2014. [DOI: 10.1118/1.4889597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Lei Y, Zhang Q, Li S, Morgan B, Driewer J, Zhou S. SU-E-T-461: Validation of Planning Algorithms in Dynamic Conformal Arc in IPlan Using ArcCHECK and 3DVH. Med Phys 2014. [DOI: 10.1118/1.4888794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zhang Q, Lei Y, Zheng D, Morgan B, Driewer J, Zhang M, Li S, Zhou S, Zhen W, Thompson R, Lin C, Wahl A, Enke C. SU-E-J-13: A New Variable for Plan Quality Evaluation Based On Normal Tissue Sparing. Med Phys 2014. [DOI: 10.1118/1.4888064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zheng D, Lin C, Bhirud A, Chen S, Lei Y, Driewer J, Zhou S. Respiratory-Correlated Duodenum Motion and Its Implications in Pancreatic SBRT. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Li S, Driewer J, Lin C. SU-E-T-286: Verification of Treatment Delivery Monitor Unit (MU) Calculation and Dose Estimation of Bilateral Total Body Irradiation (TBI). Med Phys 2012; 39:3769. [DOI: 10.1118/1.4735354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Driewer J, Chen H, Osvet A, Sun B, Ice L, Low D, Li H. WE-E-BRB-11: Radiation Hardness of the Storage Phosphor Europium Doped Potassium Chloride for Radiation Therapy Dosimetry. Med Phys 2011. [DOI: 10.1118/1.3613378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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