Independent verification of complex treatment delivery with megavolt photon beam radiotherapy (RT) has been effectively used to detect and prevent errors. This work presents the validation and uncertainty analysis of a model that predicts 2D portal dose images (PDIs) without a patient or phantom in the beam. The prediction model is based on an exponential point dose model with separable primary and secondary photon fluence components. The model includes a scatter kernel, off-axis ratio map, transmission values and penumbra kernels for beam-delimiting components. These parameters were derived through a model fitting procedure supplied with point dose and dose profile measurements of radiation fields. The model was validated against a treatment planning system (TPS; Eclipse) and radiochromic film measurements for complex clinical scenarios, including volumetric modulated arc therapy (VMAT). Confidence limits on fitted model parameters were calculated based on simulated meas...
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Objectives Greece is one of the leading tobacco-producing countries in European Union, and every year over 19 000 Greeks die from tobacco-at...
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Objectives Drug interactions, poor adherence to medication and high-risk sexual behaviour may occur in individuals with HIV using recreation...
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Abstract Background Mature T-cell and natural killer (NK)-cell lymphomas compose a heterogeneous group of non-Hodgkin lymphomas, and ext...
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Introduction Multimorbidity (MM) refers to the coexistence of two or more chronic conditions within one person, where no one condition is co...
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Objective To describe the prevalence and severity of diabetic retinopathy (DR) and sight-threatening DR (STDR) among Chinese adults with dia...
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Related Articles Three job stress models and their relationship with musculoskeletal pain in blue- and white-collar workers. J Psycho...
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<span class="paragraphSection"><div class="boxTitle">Abstract</div>Masked hypertension (MHT), defined ...
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Background Hepatitis B virus (HBV) transmission is known to occur through direct contact with infected blood. There has been some suspicion ...
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In Rwanda, the prevalence of viral hepatitis (HCV) is poorly understood. The current study investigated the prevalence and risk factors of H...
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