Essays about: "DIRA"

Showing result 1 - 5 of 6 essays containing the word DIRA.

  1. 1. Implementation of the Weighted Filtered Backprojection Algorithm in the Dual-Energy Iterative Algorithm DIRA-3D

    University essay from Linköpings universitet/Institutionen för systemteknik

    Author : Markus Tuvesson; [2021]
    Keywords : wFBP; weighted Filtered Backprojection; DIRA-3D;

    Abstract : DIRA-3D is an iterative model-based reconstruction method for dual-energy helical CT whose goal is to determine the material composition of the patient from accurate linear attenuation coefficients (LACs). Possible applications are, for example, to aid in calculations of radiation transport and dose calculations in brachytherapy with low energy photons, and in proton therapy. READ MORE

  3. 2. Automatic Tissue Segmentation of Volumetric CT Data of the Pelvic Region

    University essay from Linköpings universitet/Medicinsk informatik

    Author : Julius Jeuthe; [2017]
    Keywords : Image segmentation; Computed tomography; Pelvic region; Threshold segmentation; Region growing; Histogram matching; Atlas segmentation; Morphon;

    Abstract : Automatic segmentation of human organs allows more accurate calculation of organ doses in radiationtreatment planning, as it adds prior information about the material composition of imaged tissues. For instance, the separation of tissues into bone, adipose tissue and remaining soft tissues allows to use tabulated material compositions of those tissues. READ MORE

  4. 3. Extension of DIRA (Dual-Energy Iterative Algorithm) to 3D Helical CT

    University essay from Linköpings universitet/Datorseende

    Author : Magnus Björnfot; [2017]
    Keywords : PI-method; DIRA; DECT;

    Abstract : There is a need for quantitative CT data in radiation therapy. Currently there are only few algorithms that address this issue, for instance the commercial DirectDensity algorithm. In scientific literature, an example of such an algorithm is DIRA. READ MORE

  5. 4. Parallelization of DIRA and CTmod Using OpenMP and OpenCL

    University essay from Linköpings universitet/Informationskodning; Linköpings universitet/Tekniska fakulteten

    Author : Alexander Örtenberg; [2015]
    Keywords : ;

    Abstract : Parallelization is the answer to the ever-growing demands of computing power by taking advantage of multi-core processor technology and modern many-core graphics compute units. Multi-core CPUs and many-core GPUs have the potential to substantially reduce the execution time of a program but it is often a challenging task to ensure that all available hardware is utilized. READ MORE

  6. 5. Automatic Segmentation of Tissues in CT Images of the Pelvic Region

    University essay from Linköpings universitet/Institutionen för medicinsk teknik; Linköpings universitet/Tekniska högskolan

    Author : Martin Kardell; [2014]
    Keywords : Image segmentation; Computed tomography; Pelvic region; Prostate; Thresholding; Region growing; Atlas segmentation; Deformable models;

    Abstract : In brachytherapy, radiation therapy is performed by placing the radiation source into or very close to the tumour. When calculating the absorbed dose, water is often used as the radiation transport and dose scoring medium for soft tissues and this leads to inaccuracies. READ MORE