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https://www.readbyqxmd.com/read/28102943/comparison-of-five-cluster-validity-indices-performance-in-brain-18-f-fet-pet-image-segmentation-using-k-means
#1
Bedor Abualhaj, Guoyang Weng, Melissa Ong, Ali Asgar Attarwala, Flavia Molina, Karen Büsing, Gerhard Glatting
PURPOSE: Dynamic [(18) F]fluoro-ethyl-L-tyrosine positron emission tomography ([(18) F]FET-PET) is used to identify tumor lesions for radiotherapy treatment planning, to differentiate glioma recurrence from radiation necrosis and to classify gliomas grading. To segment different regions in the brain k-means cluster analysis can be used. The main disadvantage of k-means is that the number of clusters must be pre-defined. In this study, we therefore compared different cluster validity indices for automated and reproducible determination of the optimal number of clusters based on the dynamic PET data...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28101834/management-of-acute-skin-toxicity-with-hypericum-perforatum-and-neem-oil-during-platinum-based-concurrent-chemo-radiation-in-head-and-neck-cancer-patients
#2
Pierfrancesco Franco, Monica Rampino, Oliviero Ostellino, Marina Schena, Giancarlo Pecorari, Paolo Garzino Demo, Massimo Fasolis, Francesca Arcadipane, Stefania Martini, Chiara Cavallin, Mario Airoldi, Umberto Ricardi
Acute skin toxicity is a frequent finding during combined radiotherapy and chemotherapy in head and neck cancer patients. Its timely and appropriate management is crucial for both oncological results and patient's global quality of life. We herein report clinical data on the use of Hypericum perforatum and neem oil in the treatment of acute skin toxicity during concurrent chemo-radiation for head and neck cancer. A consecutive series of 50 head and neck cancer patients undergoing concomitant radio-chemotherapy with weekly cisplatin was analyzed...
February 2017: Medical Oncology
https://www.readbyqxmd.com/read/28079267/estimating-4d-cbct-from-prior-information-and-extremely-limited-angle-projections-using-structural-pca-and-weighted-free-form-deformation-for-lung-radiotherapy
#3
Wendy Harris, You Zhang, Fang-Fang Yin, Lei Ren
PURPOSE: To investigate the feasibility of using structural-based principal component analysis (PCA) motion-modeling and weighted free-form deformation to estimate on-board 4D-CBCT using prior information and extremely limited angle projections for potential 4D target verification of lung radiotherapy. METHODS: A technique for lung 4D-CBCT reconstruction has been previously developed using a deformation field map (DFM)-based strategy. In the previous method, each phase of the 4D-CBCT was generated by deforming a prior CT volume...
January 12, 2017: Medical Physics
https://www.readbyqxmd.com/read/28057034/the-predictive-value-of-18-f-fdg-pet-ct-for-assessing-the-clinical-outcomes-in-locally-advanced-nsclc-patients-after-a-new-induction-treatment-low-dose-fractionated-radiotherapy-with-concurrent-chemotherapy
#4
Maria Vittoria Mattoli, Mariangela Massaccesi, Alessandra Castelluccia, Valentina Scolozzi, Giovanna Mantini, Maria Lucia Calcagni
BACKGROUND: Patients with locally advanced non-small-cell lung cancer (LA-NSCLC) have poor prognosis despite several multimodal approaches. Recently, low-dose fractionated radiotherapy concurrent to the induction chemotherapy (IC-LDRT) has been proposed to further improve the effects of chemotherapy and prognosis. Until now, the predictive value of metabolic response after IC-LDRT has not yet been investigated. AIM: to evaluate whether the early metabolic response, assessed by (18)F-fluoro-deoxyglucose positron emission-computed tomography ((18)F-FDG PET-CT), could predict the prognosis in LA-NSCLC patients treated with a multimodal approach, including IC-LDRT...
January 5, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28048596/su-f-t-248-fmea-risk-analysis-implementation-aapm-tg-100-in-total-skin-electron-irradiation-technique
#5
B Ibanez-Rosello, J Bautista-Ballesteros, J Bonaque, J Perez-Calatayud, A Gonzalez-Sanchis, J Lopez-Torrecilla, L Brualla-Gonzalez, T Garcia-Hernandez, A Vicedo-Gonzalez, D Granero, A Serrano, B Borderia, C Solera, J Rosello
PURPOSE: Total Skin Electron Irradiation (TSEI) is a radiotherapy treatment which involves irradiating the entire body surface as homogeneously as possible. It is composed of an extensive multi-step technique in which quality management requires high consumption of resources and a fluid communication between the involved staff, necessary to improve the safety of treatment. The TG-100 proposes a new perspective of quality management in radiotherapy, presenting a systematic method of risk analysis throughout the global flow of the stages through the patient...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048404/we-h-201-03-enthusiasm-and-generosity-of-spirit-necessitate-a-volunteering-structure-to-make-them-more-meaningful
#6
Y Pipman
: The desperate need for radiotherapy in low and mid-income countries (LMICs) has been well documented. Roughly 60 % of the worldwide incidence of cancer occurs in these resource-limited settings and the international community alongside governmental and non-profit agencies have begun publishing reports and seeking help from qualified volunteers. However, the focus of several reports has been on how dire the situation is and the magnitude of the problem, leaving most to feel overwhelmed and unsure as to how to help and why to get involved...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048395/we-fg-206-07-assessing-the-lung-function-of-patients-with-non-small-cell-lung-cancer-using-hyperpolarized-xenon-129-dissolved-phase-mri
#7
K Qing, J Mugler, Q Chen
PURPOSE: Hyperpolarized xenon-129 dissolved-phase MRI is the first imaging technique that allows 3-dimensional regional mapping of ventilation and gas uptake by tissue and blood the in human lung. Multiple outcome measures can be produced from this method. Existing studies in subjects with major lung diseases compared to healthy controls demonstrated high sensitivities of this method to pulmonary physiological factors including ventilation, alveolar tissue density, surface-to-volume ratio, pulmonary perfusion and gas-blood barrier thickness...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048297/th-ef-bra-08-a-novel-technique-for-estimating-volumetric-cine-mri-vc-mri-from-multi-slice-sparsely-sampled-cine-images-using-motion-modeling-and-free-form-deformation
#8
W Harris, F Yin, C Wang, Z Chang, J Cai, Y Zhang, L Ren
PURPOSE: To develop a technique to estimate on-board VC-MRI using multi-slice sparsely-sampled cine images, patient prior 4D-MRI, motion-modeling and free-form deformation for real-time 3D target verification of lung radiotherapy. METHODS: A previous method has been developed to generate on-board VC-MRI by deforming prior MRI images based on a motion model(MM) extracted from prior 4D-MRI and a single-slice on-board 2D-cine image. In this study, free-form deformation(FD) was introduced to correct for errors in the MM when large anatomical changes exist...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047816/su-g-jep3-04-estimating-4d-cbct-from-prior-information-and-extremely-limited-angle-projections-using-structural-pca-and-weighted-free-form-deformation
#9
W Harris, F Yin, Y Zhang, L Ren
PURPOSE: To investigate the feasibility of using structure-based principal component analysis (PCA) motion-modeling and weighted free-form deformation to estimate on-board 4D-CBCT using prior information and extremely limited angle projections for potential 4D target verification of lung radiotherapy. METHODS: A technique for lung 4D-CBCT reconstruction has been previously developed using a deformation field map (DFM)-based strategy. In the previous method, each phase of the 4D-CBCT was generated by deforming a prior CT volume...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047760/we-h-201-04-models-for-developing-medical-physics-educators-and-education-programs-in-the-developing-countries-and-the-potential-role-of-us-universities-and-individual-medical-physicists
#10
P Sprawls
: The desperate need for radiotherapy in low and mid-income countries (LMICs) has been well documented. Roughly 60 % of the worldwide incidence of cancer occurs in these resource-limited settings and the international community alongside governmental and non-profit agencies have begun publishing reports and seeking help from qualified volunteers. However, the focus of several reports has been on how dire the situation is and the magnitude of the problem, leaving most to feel overwhelmed and unsure as to how to help and why to get involved...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047638/su-f-p-09-a-global-medical-physics-collaboration-for-implementation-of-modern-radiotherapy-in-botswana
#11
R Makufa, M Bvochora-Nsingo, T Karumekayi, R J Schneider, J A Efstathiou, S Dryden-Peterson, A Odom, A Shulman, Y Pipman, D P Gierga
PURPOSE: The global burden of cancer is considerable, particularly in low and middle-income countries. Massachusetts General Hospital (MGH) and Botswana-Harvard AIDS Institute have partnered with the oncology community and government of Botswana to form BOTSOGO (BOTSwana Oncology Global Outreach) to address the rising burden of cancer in Botswana. Currently, radiation therapy (RT) is only available at a single linear accelerator (LINAC) in Gaborone Private Hospital (GPH). BOTSOGO worked to limit the absence of RT during a LINAC upgrade and ensure a safe transition to modern radiotherapy techniques...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047637/we-h-201-00-opportunities-for-physicists-to-support-low-and-mid-income-countries
#12
Julianne Pollard
: The desperate need for radiotherapy in low and mid-income countries (LMICs) has been well documented. Roughly 60 % of the worldwide incidence of cancer occurs in these resource-limited settings and the international community alongside governmental and non-profit agencies have begun publishing reports and seeking help from qualified volunteers. However, the focus of several reports has been on how dire the situation is and the magnitude of the problem, leaving most to feel overwhelmed and unsure as to how to help and why to get involved...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047524/su-f-p-05-initial-experience-with-an-independent-certification-program-for-stereotactic-radiosurgery-and-stereotactic-body-radiation-therapy
#13
T Solberg, J Robar, T Gevaert, M Todorovic, J Howe
PURPOSE: The ASTRO document "Safety is no accident: A FRAMEWORK FOR QUALITY RADIATION ONCOLOGY AND CARE" recommends external reviews of specialized modalities. The purpose of this presentation is to describe the implementation of such a program for Stereotactic Radiosurgery (SRS) and Stereotactic Body radiation Therapy (SBRT). METHODS: The margin of error for SRS and SBRT delivery is significantly smaller than that of conventional radiotherapy and therefore requires special attention and diligence...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047350/su-f-t-256-4d-imrt-planning-using-an-early-prototype-gpu-enabled-eclipse-workstation
#14
A Hagan, A Modiri, M Svatos, A Sawant
PURPOSE: True 4D IMRT planning, based on simultaneous spatiotemporal optimization has been shown to significantly improve plan quality in lung radiotherapy. However, the high computational complexity associated with such planning represents a significant barrier to widespread clinical deployment. We introduce an early prototype GPU-enabled Eclipse workstation for inverse planning. To our knowledge, this is the first GPUintegrated Eclipse system demonstrating the potential for clinical translation of GPU computing on a major commercially-available TPS...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047301/tu-ab-202-10-how-effective-are-current-atlas-selection-methods-for-atlas-based-auto-contouring-in-radiotherapy-planning
#15
D Peressutti, B Schipaanboord, J van Soest, T Lustberg, W van Elmpt, T Kadir, A Dekker, M Gooding
PURPOSE: To investigate the effectiveness of atlas selection methods for improving atlas-based auto-contouring in radiotherapy planning. METHODS: 275 H&N clinically delineated cases were employed as an atlas database from which atlases would be selected. A further 40 previously contoured cases were used as test patients against which atlas selection could be performed and evaluated. 26 variations of selection methods proposed in the literature and used in commercial systems were investigated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047237/tu-h-campus-tep1-01-variable-beam-fractionation-for-sabr
#16
A Modiri, A Sawant
PURPOSE: In current conventionally-fractionated as well as hypofractionated 3D conformal radiotherapy (CRT), the same beam arrangement is employed from fraction to fraction. We challenge this notion and postulate that by varying the beam arrangement between fractions we can achieve greater sparing of organs at risk (OARs) while maintaining PTV coverage. We use an inverse planning strategy using a swarm intelligence-based global optimization algorithm to exploit the additional degree of freedom represented by inter-fractional variation in beam angles...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047138/su-f-e-12-elective-international-rotations-in-medical-physics-residency-programs
#17
D Brown, A Mundt, J Einck, T Pawlicki
PURPOSE: The purpose of this educational program is to motivate talented, intelligent individuals to become stakeholders in the global effort to improve access to radiotherapy. METHODS: The need to improve global access to radiotherapy has been clearly established and several organizations are making substantial progress in securing funding and developing plans to achieve this worthwhile goal. The incorporation of elective international rotations in residency programs may provide one possible mechanism to promote and support this future investment...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047056/th-ef-brb-03-significant-cord-and-esophagus-dose-reduction-by-4%C3%AF-non-coplanar-spine-stereotactic-body-radiation-therapy-and-stereotactic-radiosurgery
#18
V Yu, A Tran, D Nguyen, K Woods, M Cao, T Kaprealian, R Chin, D Low, K Sheng
PURPOSE: To demonstrate significant organ-at-risk (OAR) sparing achievable with 4π non-coplanar radiotherapy on spine SBRT and SRS patients. METHODS: Twenty-five stereotactic spine cases previously treated with VMAT (n = 23) or IMRT (n = 2) were included in this study. A computer-aided-design model of a Linac with a 3D-scanned human surface was utilized to determine the feasible beam space throughout the 4π steradian and beam specific source-to-target-distances (STD) required for collision avoidance...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046986/we-h-201-01-the-opportunities-and-benefits-of-helping-lmics-how-helping-them-can-help-you
#19
J Pollard
: The desperate need for radiotherapy in low and mid-income countries (LMICs) has been well documented. Roughly 60 % of the worldwide incidence of cancer occurs in these resource-limited settings and the international community alongside governmental and non-profit agencies have begun publishing reports and seeking help from qualified volunteers. However, the focus of several reports has been on how dire the situation is and the magnitude of the problem, leaving most to feel overwhelmed and unsure as to how to help and why to get involved...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046705/su-f-t-202-an-evaluation-method-of-lifetime-attributable-risk-for-comparing-between-proton-beam-therapy-and-intensity-modulated-x-ray-therapy-for-pediatric-cancer-patients-by-averaging-four-dose-response-models-for-carcinoma-induction
#20
M Tamura, Y Ito, H Sakurai, M Mizumoto, S Kamizawa, S Murayama, H Yamashita, S Takao, R Suzuki, H Shirato
PURPOSE: To examine how much lifetime attributable risk (LAR) as an in silico surrogate marker of radiation-induced secondary cancer would be lowered by using proton beam therapy (PBT) in place of intensity modulated x-ray therapy (IMXT) in pediatric patients. METHODS: From 242 pediatric patients with cancers who were treated with PBT, 26 patients were selected by random sampling after stratification into four categories: a) brain, head, and neck, b) thoracic, c) abdominal, and d) whole craniospinal (WCNS) irradiation...
June 2016: Medical Physics
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