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Investigation of gradient echo MRI for blood vessel imaging and susceptibility-weighted imaging in the human brain
DownloadSpring 2010
Despite the vast myriad of applications and the long way it has come, MRI is still a relatively new field of knowledge with much prospect for more advancement and expansion. This work is mainly concerned with two gradient echo imaging methods which are directly or indirectly related to blood...
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Spring 2018
Quantitative relaxation mapping allows for direct non-invasive tissue quantification with removal of variations arising from RF fields and non-uniform coil sensitivity profiles. T2 may be quantified using multi-echo spin echo sequences; however, in practical imaging situations, imperfect...
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Spring 2010
A prototype system which has integrated a linear accelerator (linac) with a magnetic resonance imager (MRI) has been constructed at the Cross Cancer Institute. The real time operation of a linac-MRI system will require proper radio frequency (RF) shielding such that the MRI images can be acquired...
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Magnetic resonance imaging based radiotherapy treatment planning: problems, solutions, and applications
DownloadFall 2010
Despite their unmatched soft-tissue contrast, Magnetic Resonance (MR) images suffer from wide-ranging image distortions; this has raised questions about their suitability as an imaging modality upon which to base conformal radiation therapy treatment plans. This thesis addresses image distortion...
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Spring 2012
A promising approach to the development of an integrated system for magnetic resonance imaging-guided radiotherapy involves the rigid coupling of a medical linear accelerator to a rotating biplanar magnet assembly. Through near real-time volumetric imaging during irradiation, this hybrid system...
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Spring 2013
Real-time MR imaging of the cancer patients undergoing external beam radiation treatment represents the next generation in image guided radiotherapy. However, the radio frequency (RF) coil of the MRI is exposed to the pulsed radiation of the linear accelerator in the systems where a medical...