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Showing 1 to 14 of 14 for “"Dose Verification"”.
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Absolute Dose Verification in Intensity Modulated Radiation Fields
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Absolute Dose Verification in Intensity Modulated Radiation Fields
… is to device a method for measuring the absolute dose for Intensity modulated radiation fields. An accurate verification and physical measurement of the computed absolute dose in Intensity modulated radiation therapy (IMRT) is a challenging task. There are many sources of errors associated with …
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Evaluation of Presage® As A 3D Dose Verification to ol In Proton Beams
… techniques have advanced and radiation dose plans have become much more complex over the last decade. This is especially true in proton therapy, which involves extremely steep dose gradients as a result of positioning the Bragg peak to cover the volumes to be treated. The Bragg peak can …
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Commissioning An Anthropomorphic Spine and Lung Phantom For Remote Dose Verification of Institutions Participating In Rtog 0631
… spinal canal, esophagus, heart, and lungs. The dose to the target volume was measured with axial and sagittal planes of radiochromic film and thermoluminescent dosimeters (TLD). The dose distributions were measured with the radiochromic film calibrated to the absolute dose measured by the TLD. …
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Cone Beam Optical Computed Tomography-Based Gel Dosimetry
The complex dose distributions delivered by modern, conformal radiation therapy techniques present a considerable challenge in dose verification. Traditional measurement tools are difficult and laborious to use, since complete verification requires that the doses be determined in three dimensions …
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Identifying Treatment Planning System Errors In Iroc-Houston Head and Neck Phantom Irradiations
… beam models in an independent treatment dose verification system (TVS). Approximately 200 head and neck phantom plans from 2012 to 2015 were recalculated using this TVS. Comparison of plan accuracy was evaluated by comparing the measured dose to the institution’s TPS dose as well as the …
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Measuring cross-section data for prompt gammas emitted during proton-nucleus collisions
… popular treatment modality due to the superior dose distribution of the proton beam while sparing more surrounding normal healthy tissues and critical organs. This advantage can quickly turn into a disadvantage if there is any uncertainty in the delivery of the proton beam. To fully utilize the …
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Image-Guided Proton Therapy For Online Dose-Evaluation and Adaptive Planning
… will affect the proton range and the resultant dose distribution, making it difficult to estimate the impact of visible anatomic changes to the patient dose distribution. In order to better understand the effect of anatomy change on proton dose, some form of treatment-time verification is …
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Sub-Millimetre Positron-Emission Particle Tracking Using a CdZnTe Semiconductor Array
… With the current CZT arrays already in use for dose verification imaging, incorporating such beam-tracking to improve image quality can be easily implemented in future.
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3D Scintillator Detector Quenching Characterization For Scanning Proton Beams
… proton pencil beams provide a highly conformal dose distribution. The complex dose distribution poses challenges for quality assurance measurements leading to sophisticated detector setups and time consuming measurements. Fast 3D measurements are therefore desirable to verify the complex dose …
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Experimental investigation of the characteristics of prompt gammas produced in tissue during proton therapy treatment
… This highlights the importance of an in-vivo dose measurement technique. Due to the nature of protons, there are no primary particles exiting the patient to be used for verification purposes. One option is to use secondary radiation for dose verification purposes, like prompt gammas produced …
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Measurements of gamma-ray production cross sections of proton beam at energies of 66 to 125 MeV with calcium target
… therapy, a proton beam of speci_c radiation dose is delivered to the tumor while sparing the nearby healthy tissues. Without continuous monitoring of the delivered proton beam, this can turn into a disaster. To fully enjoy the benefits of proton therapy we need to monitor the dose deposition. …
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Optimization of Image Guided Radiation Therapy for Lung Cancer Using Limited-angle Projections
… acquisition enables scan time and imaging dose reduction and improves the mechanical clearance of imaging.</p><p>First of all, the dissertation developed a phase-matched digital tomosynthesis (DTS) technique using limited-angle (<=30 deg) projections for lung tumor localization. This …