Essays about: "bias correction"

Showing result 16 - 20 of 24 essays containing the words bias correction.

  1. 16. An iterative reconstruction algorithm for quantitative tissue decomposition using DECT

    University essay from Datorseende; Tekniska högskolan

    Author : Oscar Grandell; [2012]
    Keywords : DECT; Iterative reconstruction; Tissue decomposition; Beam hardening correction;

    Abstract : The introduction of dual energy CT, DECT, in the field of medical healthcare has made it possible to extract more information of the scanned objects. This in turn has the potential to improve the accuracy in radiation therapy dose planning. READ MORE

  3. 17. Estimation and bias correction of the magnitude of an abrupt level shift

    University essay from Statistik; Tekniska högskolan

    Author : Wenjie Liu; [2012]
    Keywords : Change-point Detection; Bias Correction; Shrinkage Factor; Level Shift; Generalized Additive Model;

    Abstract : Consider a time series model which is stationary apart from a single shift in mean. If the time of a level shift is known, the least squares estimator of the magnitude of this level shift is a minimum variance unbiased estimator. If the time is unknown, however, this estimator is biased. READ MORE

  4. 18. Effect on future hydropower potential from use of different bias correction methods for three Swedish river basins

    University essay from Lunds universitet/Avdelningen för Teknisk vattenresurslära

    Author : Tobias Renlund; Olof Nilsson; [2012]
    Keywords : Hydropower; climate change; bias correction method; spring flood; snowpack; peak flow; Technology and Engineering;

    Abstract : Hydropower is responsible for approximately 45 % of the Swedish annual electricity production making it an important constituent of the Swedish energy market. This master thesis serves to evaluate how the use of three different bias correction methods and the delta change approach effect the predicted future hydropower production in Lule, Skellefte and Dal river basin. READ MORE

  5. 19. Aerosol light absorption measurement techniques : a comparison of methods from field data and laboratory experimentation

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Christine Walsh; [2012]
    Keywords : filter-based correction; difference method; in-situ techniques; filter-based instruments; absorption; physical geography; aerosol; Earth and Environmental Sciences;

    Abstract : Popular science Currently, there is a global drive to better understand the influences behind our changing climate. With each passing decade, the world has observed dramatic changes in weather patterns, seasonal temperatures, and our surrounding natural environments. READ MORE

  6. 20. Image-Based Partial-Volume Correction in SPECT: Application to 177Lu radionuclide therapy

    University essay from Lunds universitet/Sjukhusfysikerutbildningen

    Author : Gustav Brolin; [2011]
    Keywords : nuklearmedicin; Medicine and Health Sciences;

    Abstract : Introduction and aim: In SPECT imaging, the finite spatial resolution of the imaging system leads to a blurring of the reconstructed image. Consequently, counts originating from each point in the source distribution will be spread out over a volume in the reconstructed image, leading to spill-over of counts between different structures and distortion of the apparent activity concentration. READ MORE