Essays about: "MRI"

Showing result 31 - 35 of 326 essays containing the word MRI.

1. 31. Optimization of MP2RAGE sequence parameters for head and neck T1-mapping and OE-MRI

   University essay from

   Author : Ellen Börjesson; [2022-05-04]
   Keywords : Medical physics; MRI; OE-MRI; MP2RAGE; T1-mapping;

   Abstract : Cancer is the collective name for more than 200 types of diseases that annually causes the death of 8.8 million people, cancer in the head and neck (H&N) accounts for 330.000 of these. It has been shown that hypoxic tumors are more resistant to treatment than well oxygenated tumors. READ MORE

3. 32. Region-based analysis of magnetic resonance brain images: integrating statistical analysis and visualization

   University essay from

   Author : Yu-Ping Hsu; [2022-04-05]
   Keywords : Medical physics; Neuroimage; Brain segmentation; Statistical analysis; Visualization;

   Abstract : Purpose: The purpose of the project was to develop a processing toolchain that takes MR brain images and their anatomical segmentations as input and produces image visualizations, data visualizations, and statistical analyses in a unified manner for the users who work with neuroimaging and quantitative brain anatomy, including pathological anatomy. A secondary aim was to package and release the software publicly as open source. READ MORE

4. 33. Effects of reconstruction parameters on the image quality and quantification of PET images from PET/MRI and PET/CT systems

   University essay from

   Author : Ali Amena Hussain; [2022-03-09]
   Keywords : Medical physics; PET CT; PET MRI; OSEM; BPL; NEMA IQ; positron emission tomography; magnetic resonance imaging; computed tomography; ordered Subset Expectation Maximization; The Bayesian Penalized Likelihood;

   Abstract : Aim: To study how reconstruction parameters affect the positron emission tomography (PET) image quality and quantitative results for the different lesion to background radioactivity ratios in three different PET systems. Introduction: Multimodality imaging that combines magnetic resonance imaging (MRI) or computed tomography (CT) with a PET system can produce medical images containing both functional and anatomical information. READ MORE

5. 34. osimetric impact of system spe cific geometric distortion on head and neck treatment plans in MRI only based radiation therapy

   University essay from

   Author : Jesper Brovall; [2022-01-13]
   Keywords : Medical physics; Dosimetry; MRI; Radiation therapy;

   Abstract : Background/ purpose: Because of the superior soft tissue contrast, in comparison with computed tomography (CT) data, magnetic resonance imaging (MRI) is of high interest to include in a larger extent in the ra diation therapy (RT) process. In an MRI only workflow, the CT scan is excluded and a synthetic CT is used for treatment plan ning. READ MORE

6. 35. ATLAS-BASED SEGMENTATION OF ULTRAHIGH-RESOLUTION STRUCTURAL MR HEAD IMAGES ACQUIRED AT 7 TESLA

   University essay from

   Author : Frida Johansson; [2022-01-13]
   Keywords : Medical physics; Anatomical segmentation; Brain; MRI; 7 Tesla; Pincram; MAPER; Shape based averaging; Ultrahigh resolution;

   Abstract : Purpose: The purpose of this work was to find out how the existing brain atlases and segmentation algorithms perform when applied to ultrahigh-resolution MR brain images, acquired with a 7-Tesla scanner. Also to make adaptations to deal with the potential challenges and evaluate the quality of the anatomical segmentations of the 7- Tesla images. READ MORE