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Park Y, Sharp G, Winey B. MO-FG-CAMPUS-JeP3-03: Detection of Unpredictable Patient Movement During SBRT Using a Single KV Projection of An On-Board CBCT System: Simulation Study. Med Phys 2016. [DOI: 10.1118/1.4957378] [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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Shusharina N, Khan F, Sharp G, Choi N. SU-G-BRC-12: Isotoxic Dose Escalation for Advanced Lung Cancer: Comparison of Different Boosting Strategiesfor Patients with Recurrent Disease. Med Phys 2016. [DOI: 10.1118/1.4956902] [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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Moteabbed M, Trofimov A, Sharp G, Wang Y, Zietman A, Efstathiou J, Lu H. SU-G-JeP4-09: Impact of Interfractional Motion On Hypofractionated Pencil Beam Scanning Proton Therapy for Prostate Cancer. Med Phys 2016. [DOI: 10.1118/1.4957119] [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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Zhang R, Jee K, Sharp G, Flanz J, Lu H. SU-C-207A-05: Feature Based Water Equivalent Path Length (WEPL) Determination for Proton Radiography by the Technique of Time Resolved Dose Measurement. Med Phys 2016. [DOI: 10.1118/1.4955580] [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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Zaffino P, Raudaschl P, Fritscher K, Spadea M, Sharp G. SU-G-IeP2-14: Validation of Plastimatch MABS, a Tool for Automatic Image Segmentation. Med Phys 2016. [DOI: 10.1118/1.4957019] [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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Ren X, Sharp G, Gao H. SU-C-BRA-04: Automated Segmentation of Head-And-Neck CT Images for Radiotherapy Treatment Planning Via Multi-Atlas Machine Learning (MAML). Med Phys 2016. [DOI: 10.1118/1.4955565] [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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Seco J, Izquierdo D, Catana C, Pileggi G, Pursley J, Speier C, Sharp G, Bert C, Collins-Fekete C, Spadea M. EP-1838: Proton therapy planning for brain tumors using MRI-generated PseudoCT. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)33089-4] [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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Speier C, Pileggi G, Izquierdo D, Catana C, Sharp G, Bert C, Seco J, Spadea M. EP-1846: Pseudo-CT generation from T1 and T2-weighted brain MRI based on a localised correlation approach. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)33097-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Thorpe SJ, Fox B, Sharp G, White J, Milkins C. A WHO reference reagent to standardize haemagglutination testing for anti-A and anti-B in serum and plasma: international collaborative study to evaluate a candidate preparation. Vox Sang 2016; 111:161-70. [DOI: 10.1111/vox.12399] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/16/2016] [Accepted: 02/17/2016] [Indexed: 12/18/2022]
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Grassberger C, Dowdell S, Sharp G, Paganetti H. Motion mitigation for lung cancer patients treated with active scanning proton therapy. Med Phys 2016; 42:2462-9. [PMID: 25979039 DOI: 10.1118/1.4916662] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
PURPOSE Motion interplay can affect the tumor dose in scanned proton beam therapy. This study assesses the ability of rescanning and gating to mitigate interplay effects during lung treatments. METHODS The treatments of five lung cancer patients [48 Gy(RBE)/4fx] with varying tumor size (21.1-82.3 cm(3)) and motion amplitude (2.9-30.6 mm) were simulated employing 4D Monte Carlo. The authors investigated two spot sizes (σ ∼ 12 and ∼ 3 mm), three rescanning techniques (layered, volumetric, breath-sampled volumetric) and respiratory gating with a 30% duty cycle. RESULTS For 4/5 patients, layered rescanning 6/2 times (for the small/large spot size) maintains equivalent uniform dose within the target >98% for a single fraction. Breath sampling the timing of rescanning is ∼ 2 times more effective than the same number of continuous rescans. Volumetric rescanning is sensitive to synchronization effects, which was observed in 3/5 patients, though not for layered rescanning. For the large spot size, rescanning compared favorably with gating in terms of time requirements, i.e., 2x-rescanning is on average a factor ∼ 2.6 faster than gating for this scenario. For the small spot size however, 6x-rescanning takes on average 65% longer compared to gating. Rescanning has no effect on normal lung V20 and mean lung dose (MLD), though it reduces the maximum lung dose by on average 6.9 ± 2.4/16.7 ± 12.2 Gy(RBE) for the large and small spot sizes, respectively. Gating leads to a similar reduction in maximum dose and additionally reduces V20 and MLD. Breath-sampled rescanning is most successful in reducing the maximum dose to the normal lung. CONCLUSIONS Both rescanning (2-6 times, depending on the beam size) as well as gating was able to mitigate interplay effects in the target for 4/5 patients studied. Layered rescanning is superior to volumetric rescanning, as the latter suffers from synchronization effects in 3/5 patients studied. Gating minimizes the irradiated volume of normal lung more efficiently, while breath-sampled rescanning is superior in reducing maximum doses to organs at risk.
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Wachinger C, Fritscher K, Sharp G, Golland P. Contour-Driven Atlas-Based Segmentation. IEEE TRANSACTIONS ON MEDICAL IMAGING 2015; 34:2492-505. [PMID: 26068202 PMCID: PMC4756595 DOI: 10.1109/tmi.2015.2442753] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We propose new methods for automatic segmentation of images based on an atlas of manually labeled scans and contours in the image. First, we introduce a Bayesian framework for creating initial label maps from manually annotated training images. Within this framework, we model various registration- and patch-based segmentation techniques by changing the deformation field prior. Second, we perform contour-driven regression on the created label maps to refine the segmentation. Image contours and image parcellations give rise to non-stationary kernel functions that model the relationship between image locations. Setting the kernel to the covariance function in a Gaussian process establishes a distribution over label maps supported by image structures. Maximum a posteriori estimation of the distribution over label maps conditioned on the outcome of the atlas-based segmentation yields the refined segmentation. We evaluate the segmentation in two clinical applications: the segmentation of parotid glands in head and neck CT scans and the segmentation of the left atrium in cardiac MR angiography images.
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Desplanques M, Rossi S, Fossati P, Ciocca M, Orecchia R, Riboldi M, Sharp G, Baroni G. Technical and medical status of the hadrontherapy facility CNAO, sited in Pavia (IT), after a three-year experience. Phys Med 2015. [DOI: 10.1016/j.ejmp.2015.10.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Sharp G, Tiggemann M. P13.14 Educating women about normal female genital appearance: the effectiveness of two brief interventions. Br J Vener Dis 2015. [DOI: 10.1136/sextrans-2015-052270.512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Shusharina N, Khan F, Sharp G, Choi N. SU-E-J-124: 18F-FDG PET Imaging to Improve RT Treatment Outcome for Locally Advanced Lung Cancer. Med Phys 2015. [DOI: 10.1118/1.4924210] [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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Phillips J, Gueorguiev G, Grassberger C, Paganetti H, Sharp G. SU-E-T-639: Proton Dose Calculation for Irregular Motion Using a Sliding Interface. Med Phys 2015. [DOI: 10.1118/1.4925002] [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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41
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Ren X, Sharp G, Gao H. SU-E-J-132: Automated Segmentation with Post-Registration Atlas Selection Based On Mutual Information. Med Phys 2015. [DOI: 10.1118/1.4924218] [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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Saleh Z, Thor M, Sharp G, Tang X, Volpe T, Margiasso R, Veeraraghavan H, Muren L, Deasy J. SU-E-J-95: A Novel Objective Approach to Identify Scan Outliers in Deformable Image Registration for Longitudinal Datasets. Med Phys 2015. [DOI: 10.1118/1.4924182] [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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Sharp G. WE-D-201-01: Plastimatch and SlicerRT. Med Phys 2015. [DOI: 10.1118/1.4925954] [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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Gertsenshteyn I, Tyagi N, Farjam R, Apte A, Sharp G. TU-CD-BRA-02: Comparing Mutual Information and Gradient Magnitude Metrics for Deformable Image Registration. Med Phys 2015. [DOI: 10.1118/1.4925599] [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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45
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Grassberger C, Sharp G, Fintelmann F, Paganetti H, Willers H. SU-E-J-247: Time Evolution of Radiation-Induced Lung Injury After Stereotactic Proton Therapy. Med Phys 2015. [DOI: 10.1118/1.4924333] [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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Doolan PJ, Testa M, Sharp G, Bentefour EH, Royle G, Lu HM. Patient-specific stopping power calibration for proton therapy planning based on single-detector proton radiography. Phys Med Biol 2015; 60:1901-17. [DOI: 10.1088/0031-9155/60/5/1901] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Saleh Z, Thor M, Apte A, Sharp G, Muren L, Deasy J. SU-E-J-159: Intra-Patient Deformable Image Registration Uncertainties Quantified Using the Distance Discordance Metric. Med Phys 2014. [DOI: 10.1118/1.4888212] [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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Shusharina N, Khan F, Choi N, Sharp G. SU-E-T-500: Dose Escalation Strategy for Lung Cancer Patients Using a Biologically- Guided Target Definition. Med Phys 2014. [DOI: 10.1118/1.4888833] [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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Grassberger C, Daartz J, Dowdell S, Ruggieri T, Sharp G, Paganetti H. TH-A-19A-03: Impact of Proton Dose Calculation Method On Delivered Dose to Lung Tumors: Experiments in Thorax Phantom and Planning Study in Patient Cohort. Med Phys 2014. [DOI: 10.1118/1.4889536] [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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50
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Moteabbed M, Trofimov A, Testa M, Sharp G, Wang Y, Paganetti H, Zietman A, Efstathiou J, Lu H. SU-E-T-616: Comparison of Plan Dose Accuracy for Anterior Vs. Lateral Fields in Proton Therapy of Prostate Cancer. Med Phys 2014. [DOI: 10.1118/1.4888952] [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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