Sökning: "Dose distribution"

Visar resultat 1 - 5 av 102 uppsatser innehållade orden Dose distribution.

1. 1. Evaluating aperture shape controller (ASC) in modulated radiation treatments

   Master-uppsats,

   Författare :Vilma Andrén Cederholm; [2023-09-28]
   Nyckelord :Medical physics;

   Sammanfattning : To decrease aperture complexity, the aperture shape controller (ASC) is a recently introduced function in Eclipse external beam planning (Varian Medical Systems, Palo Alto, USA). ASC works within the photon optimizer, minimizing distances between adjacent leaf tips of the MLC. LÄS MER

3. 2. Uncertainty Estimation in Radiation Dose Prediction U-Net

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Frida Skarf; [2023]
   Nyckelord :Radiation dose prediction models; U-net; quantile regression; Monte Carlo Dropout; epistemic uncertainty estimation; aleatoric uncertainty estimation; Stråldospredicerande modeller; U-net; kvantilregression; Monte Carlo Dropout; epistemisk osäkerhetsskattning; aletorisk osäkerhetsskattning;

   Sammanfattning : The ability to quantify uncertainties associated with neural network predictions is crucial when they are relied upon in decision-making processes, especially in safety-critical applications like radiation therapy. In this paper, a single-model estimator of both epistemic and aleatoric uncertainties in a regression 3D U-net used for radiation dose prediction is presented. LÄS MER

4. 3. Organized Crime and Government Trust under the Covid-19 pandemic. The case study of Sicily.

   Master-uppsats, Lunds universitet/Ekonomisk-historiska institutionen

   Författare :Andrea Cavallo; [2023]
   Nyckelord :Sicilian Mafia; organized crime; government trust; Covid-19; vaccination campaign.; Social Sciences; Law and Political Science; Business and Economics;

   Sammanfattning : Do municipalities in which organized crime is strongly established present lower Covid-19 vaccination rates, as a proxy for government trust? This paper aims to answer this question in the specific case of the Italian region of Sicily. Specifically, the analysis exploits a panel dataset of 390 Sicilian municipalities over 107 weeks (between the 27th of December 2020 and the 1st of January 2023) to study if areas with a higher presence of the Mafia, measured through historical sources and more recent data, negatively correlate with the cumulative weekly percentage of Covid-19 vaccinations per municipality. LÄS MER

5. 4. Polymer gel dosimetry with MRI-readout for 3D dose verification - detector characteristics and clinical applications

   Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

   Författare :Thi Guldhill; [2023]
   Nyckelord :Medicine and Health Sciences;

   Sammanfattning : Background & Purpose: Radiation therapy is an essential treatment for cancer patients with the ultimate goal to deliver radiation doses to the tumour with precision while minimizing exposure to surrounding healthy tissues. Treatment verification is crucial to ensure the accuracy of radiation delivery, for instance by measuring the radiation dose distribution. LÄS MER

7. 5. The effect of lactose fines, magnesium stearate, choice of mixer and mixing process on the performance of adhesive mixtures for inhalation

   Master-uppsats, Lunds universitet/Livsmedelsteknik och nutrition (master)

   Författare :Gabriela Ponce Aparicio; [2023]
   Nyckelord :High shear mixing; low shear mixing; lactose fines; coating agent; budesonide; mixing energy; dry powder inhaler; carrier-based formulations; mixing time; adhesive mixtures; pharmaceutical technology; Technology and Engineering;

   Sammanfattning : Dry powder inhaler (DPI) formulation is a major area of interest since they are employed by the healthcare system to treat relevant chronic diseases like asthma. Previous research has established that the manufacturing process and formulation composition are key for the active pharmaceutical ingredient to reach the lungs and achieve therapeutic effects. LÄS MER