Physica Medica
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2.48
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6,697
Papers 6,078
1 page of 608 pages (6,078 results)
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#1Kentaro Suzuki (Nagoya University)H-Index: 6
#2Takeshi Kamomae (Nagoya University)H-Index: 9
Last. Mariko Kawamura (Nagoya University)H-Index: 8
view all 13 authors...
PURPOSE We developed an x-ray-opaque-marker (XOM) system with inserted fiducial markers for patient-specific quality assurance (QA) in CyberKnife (Accuray) and a general-purpose linear accelerator (linac). The XOM system can be easily inserted or removed from the existing patient-specific QA phantom. Our study aimed to assess the utility of the XOM system by evaluating the recognition accuracy of the phantom position error and estimating the dose perturbation around a marker. METHODS The recogni...
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#1Seongmoon Jung (SNUH: Seoul National University Hospital)H-Index: 1
#2Jung In Kim (SNUH: Seoul National University Hospital)H-Index: 14
Last. Chang Heon Choi (SNU: Seoul National University)H-Index: 10
view all 5 authors...
Abstract null null Purpose null This study reports a sensitivity enhancement of gold-coated contact lens-type ocular in vivo dosimeters (CLODs) for low-dose measurements in computed tomography (CT). null null null Methods null Monte Carlo (MC) simulations were conducted to evaluate the dose enhancement from the gold (Au) layers on the CLODs. The human eye and CLODs were modeled, and the X-ray tube voltages were defined as 80, 120, and 140 kVp. The thickness of the Au layer attached to a CLOD ran...
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#1Hiroki Nakayama (Tokyo Metropolitan University)H-Index: 3
#2Satoshi NakamuraH-Index: 13
Last. Weishan Chang (Tokyo Metropolitan University)H-Index: 2
view all 11 authors...
Abstract null null Purpose null To increase the superficial dose and reduce the brain dose for radiotherapy of scalp angiosarcoma, we propose a novel irradiation technique of tangential irradiation volumetric modulated arc therapy (TI-VMAT). null null null Methods null TI-VMAT and the conventional VMAT treatment plans for thirteen scalp angiosarcoma patients were created with a prescribed dose of 70 Gy. Each treatment was normalized to cover 95% of the planning target volume (PTV) with its presc...
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#1H. Afsharpour (University of Toronto)
#2M. Nielsen (SHSC : Sunnybrook Health Science Centre)
Last. R. Sankreacha (University of Toronto)
view all 7 authors...
Abstract null null Purpose null The objective of this work is to explore a methodology to enable plan transfers from Standard MLC (STD) to High Definition MLC (HD) Varian units without replanning. Using “Plan Transformation”, we aim to utilize full departmental capacity to disperse patients from STD Varian units to HD units, when the former goes down for repair. null null null Methods null Our centre is equipped with four STD and two HD MLC Varian Truebeam units. Plan transformation is used to t...
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#2Tayebeh A. Chiniforoush (IAU: Islamic Azad University, Tehran)
Last. Mahdi Sadeghi (IUMS: Iran University of Medical Sciences)H-Index: 20
view all 3 authors...
Abstract null null In recent decades, eye plaques of brachytherapy have been extensively used as primary treatment as well as a complementary treatment for ocular cancer. The purpose of this study is the development of the eye plaque brachytherapy throughout a new design of eye plaque by combining the COMS plaque and the CCB BEBIG plaque loaded by IRA1-103Pd and 106Ru, respectively. A new dual-core plaque with a diameter of 20 mm was designed in the way that the BEBIG plaque with a diameter of 2...
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#1Lorenzo Placidi (UCSC: Catholic University of the Sacred Heart)H-Index: 9
#2Davide CusumanoH-Index: 12
Last. Luca IndovinaH-Index: 10
view all 10 authors...
PURPOSE The unique treatment delivery technique provided by magnetic resonance guided radiotherapy (MRgRT) can represent a significant drawback when system fail occurs. This retrospective study proposes and evaluates a pipeline to completely automate the workflow necessary to shift a MRgRT treatment to a traditional radiotherapy linac. MATERIAL AND METHODS Patients undergoing treatment during the last MRgRT system failure were retrospectively included in this study. The core of the proposed pipe...
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#1Carlos Huerga (Hospital Universitario La Paz)H-Index: 6
#2Ana Belén Morcillo (Hospital Universitario La Paz)H-Index: 1
Last. Mónica Coronado (Hospital Universitario La Paz)H-Index: 6
view all 9 authors...
Abstract null null Predictive models of tumor response based on heterogeneity metrics in medical images, such as textural features, are highly suggestive. However, the demonstrated sensitivity of these features to noise does affect the model being developed. An in-depth analysis of the noise influence on the extraction of texture features was performed based on the assumption that an improvement in information quality can also enhance the predictive model. A heuristic approach was used that reco...
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#1B. PetrovicH-Index: 6
#2Ferenc VickoH-Index: 3
Last. Olivera IvanovH-Index: 1
view all 10 authors...
Abstract null null Introduction null Sentinel node biopsy is a procedure used for axillary nodal staging in breast cancer surgery. The process uses radioactive 99mTc isotope for mapping the sentinel node(s) and all the staff involved in the procedure is potentially exposed to ionizing radiation. The colloid for radiolabelling (antimone-sulphide) with 99mTc isotope (half-life 6 h) is injected into the patient breast. The injection has activity of 18.5 MBq. The surgeon removes the primary tumor an...
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#1Hojin Kim (Yonsei University)H-Index: 8
#2Youngmoon Goh (AMC : Asan Medical Center)H-Index: 2
Last. Young Kyung LimH-Index: 13
view all 5 authors...
Abstract null null A new tandem applicator with tungsten shield for Ir-192 radiation source used in intra-cavitary brachytherapy (ICBT) enabled intensity modulated brachytherapy (IMBT) in cervical cancer treatment through fluence-modulation by rotating shield. Our previous work employed group-wise and element-wise sparsity constraints for plan optimization of tandem applicator to minimizes the number of activated angles and source dwell points for delivery efficiency. It, however, did not incorp...
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#1Loïc Vander Veken (UCL: Université Catholique de Louvain)H-Index: 1
#2D. Dechambre (Cliniques Universitaires Saint-Luc)H-Index: 5
Last. Xavier Geets (UCL: Université Catholique de Louvain)H-Index: 25
view all 7 authors...
Abstract null null Purpose null Planning target volume (PTV) definition based on Mid-Position (Mid-P) strategy typically integrates breathing motion from tumor positions variances along the conventional axes of the DICOM coordinate system. Tumor motion directionality is thus neglected even though it is one of its stable characteristics in time. We therefore propose the directional MidP approach (MidP dir), which allows motion directionality to be incorporated into PTV margins. A second objective...
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