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No other field in medicine utilizes imaging more in day to day practice than radiation oncology. Fundamentally, imaging in the form of computed tomography (CT), ultrasound (U/S), mammography, magnetic resonance imaging (MRI), positron emission tomography (PET), and fluoroscopy among others guides all treatment decision making. No sites of disease are these tools perhaps more necessary than in the...
The purpose of this study was to compare two different strategies of MR data acquisition for MR-based PET attenuation correction (MRAC). One of the leading causes of image variability in MR acquisition is the choice of transmit/receive radio-frequency coils. We use a PET/CT-MR tri-modality setup to evaluate the advantages and limitations of local and body coil MR data acquisition for the generation...
A challenge for hybrid PET/MRI imaging is the determination of the photon attenuation map to correct the acquired PET data. Segmentation of adapted MRI sequence data in four tissue classes (background, lungs, fat, and soft tissue) is proposed and evaluated using data from 35 PET/CT whole-body oncological examinations as well as two PET/CT and MRI examinations from the same patients. When reconstructing...
A respiratory gating method based on spirometry was developed and tested during PET/CT and MRI studies. The method was compared to two commercial respiratory gating methods: the motion tracking system using infrared camera and respiratory monitoring belt. The spirometry method provided advantages compared to the infrared camera system and had superior signal quality compared to the respiratory belt...
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