Sökning: "gradient imperfections"

Hittade 2 uppsatser innehållade orden gradient imperfections.

1. 1. Correction of Radial Sampling Trajectories by Modeling Nominal Gradient Waveforms and Convolving with Gradient Impulse Response Function

   Kandidat-uppsats, KTH/Medicinteknik och hälsosystem

   Författare :Max Kim; Adham Belbaisi; [2019]
   Nyckelord :Magnetic resonance imaging; MRI; gradient waveforms; radial sampling; gradient imperfections; gradient impulse response function; GIRF; Magnetresonanstomografi; MRI; gradient vågformer; radiell sampling; gradient imperfektioner; gradient impulsresponsfunktion; GIRF;

   Sammanfattning : There are several reasons for using non-Cartesian k-space sampling methods in Magnetic Resonance Imaging (MRI). Such a method is radial sampling, which includes the advantage of continuous coverage of the k-space center which results in higher robustness to motion. LÄS MER

3. 2. Simulation of Temperature Distribution in IR Camera Chip

   Uppsats för yrkesexamina på avancerad nivå, Informationskodning

   Författare :Stefan Salomonsson; [2011]
   Nyckelord :Thermal modeling; Thermal imaging; Bolometer detector; Finite Element Method; COMSOL Multiphysics;

   Sammanfattning : The thesis investigates the temperature distribution in the chip of an infrared camera caused by its read out integrated circuit. The heat from the read out circuits can cause distortions to the thermal image. LÄS MER