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Showing result 11 - 15 of 20 essays matching the above criteria.

  1. 11. Quantitative Tissue Classification via Dual Energy Computed Tomography for Brachytherapy Treatment Planning : Accuracy of the Three Material Decomposition Method

    University essay from Institutionen för medicinsk teknik; Tekniska högskolan

    Author : Merve Gürlüler; [2013]
    Keywords : brachytherapy; material decomposition; tissue classification; dual energy computed tomography;

    Abstract : Dual Energy Computed Tomography (DECT) is an emerging technique that offers new possibilities to determine composition of tissues in clinical applications. Accurate knowledge of tissue composition is important for instance for brachytherapy (BT) treatment planning. READ MORE

  3. 12. Three material decomposition in dual energy CT for brachytherapy using the iterative image reconstruction algorithm DIRA : Performance of the method for an anthropomorphic phantom

    University essay from Institutionen för medicinsk teknik; Tekniska högskolan

    Author : Robin Westin; [2013]
    Keywords : DECT; Iterative reconstruction; Tissue decomposition; Numerical stability; Uncertainty propagation;

    Abstract : Brachytherapy is radiation therapy performed by placing a radiation source near or inside a tumor. Difference between the current water-based brachytherapy dose formalism (TG-43) and new model based dose calculation algorithms (MBSCAs) can differ by more than a factor of 10 in the calculated doses. READ MORE

  4. 13. Brachytherapy of Squamous Cell Carcinoma in the Lip MDR to PDR Treatment Conversion

    University essay from Lunds universitet/Sjukhusfysikerutbildningen

    Author : Daniel Gasic; [2010]
    Keywords : Strålterapi; Medicine and Health Sciences;

    Abstract : Introduction: From 1988 – 2004, patients with squamous cell carcinoma in the lower lip were treated with medium dose rate (MDR) 192Ir wires using a manual afterloading tech-nique. An average of 3 wires were used, each with a mean length of 36 mm (range 27 – 65 mm) and a mean dose rate of 4.5 Gy/h (range 1.8 – 8. READ MORE

  5. 14. Quantitative tissue classication with dual-energy computed tomography for radiation treatment planning evaluation and optimization of a new method

    University essay from Lunds universitet/Sjukhusfysikerutbildningen

    Author : Mattias Karlsson; [2010]
    Keywords : Röntgen; Medicine and Health Sciences;

    Abstract : A new method to extract mass density and elemental compositions of tissues from dual-energy computed tomography (DECT) scans is described and investigated. The method decomposes a tissue into proportions of two or three predened base materials and was proposed in 2008 by a research team at Linkoping University. READ MORE

  6. 15. Causes of multimodality of efficiency gain distributions in accelerated Monte Carlo based dose calculations for brachytherapy planning using correlated sampling

    University essay from Medicinsk informatik; Tekniska högskolan

    Author : Daniel Deniz; [2009]
    Keywords : Monte Carlo simulations; brachytherapy; efficiency gain;

    Abstract : Fixed-collision correlated sampling for Monte Carlo (MC) simulations is a method which can be used in order to shorten the simulation time for brachytherapy treatment planning in a 3D patient geometry. The increased efficiency compared to conventional MC simulation is measured by efficiency gain. READ MORE