Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"MRI Compatible"”.
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The development of MRI-compatible SPECT system
In recent years, combined MRI and nuclear imaging techniques such as PET and SPECT have received great attentions. MRI provides high-resolution anatomical and functional information along with an exquisite soft tissue contrast. Nuclear techniques could provide an excellent sensitivity to …
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Design of an MRI compatible robot for wrist rehabilitation
Magnetic Resonance Imaging (MRI) can be used to study the effects of robotic therapy on stroke patients. This thesis focuses on the design of an MRI compatible wrist robot to be used as a clinical tool for studying the stroke recovery process and the effectiveness of robotic therapy. The robot must …
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An MRI compatible manipulator for prostate cancer detection and treatment
… be obtained using Magnetic Resonance Imaging (MRI). This presents a technical challenge because it requires robotic assistance since there is very limited access to a patient inside the bore. Additionally, the high magnetic fields prohibit the use of conventional actuators in the procedure. …
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Inverted compound eye camera for second generation MRI compatible SPECT system
… evaluate a novel design of the second-generation MRI compatible SPECT system, MRC-SPECT-II, based on an inverted compound eye (ICE) gamma camera concept inspired by compound eyes often found in small invertebrates. The MRC-SPECT II system is constructed with a total of 24 ICE-camera panels that …
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Characterization and analysis of an MRI compatible robot design for wrist psychophysics and rehabilitation
… and evaluate its effectiveness a patented MRI compatible version of the wrist robot is being developed, so that therapy and brain imaging may be carried out simultaneously. Patient actuation is accomplished with two standard electric motors, located outside the MRI chamber, which drive a …
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Design of a 2D MRI compatible robot for performing prostate cancer treatment using therapeutic ultrasound
… prostate cancer. Magnetic resonance image (MRI) guidance of therapeutic ultrasound permits targeting and monitoring of therapy. In this thesis a prototype MRI compatible positioning device for the treatment of prostate cancer using therapeutic ultrasound is presented. The accuracy, MRI …
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Development of MRI-compatible Transducer Array for Focused Ultrasound Surgery: : The Use of Relaxor-based Piezocrystals
… the development of ultrasound arrays for MRI guided FUS, from the point of view of the potential piezoelectric material of choice. Two materials are of particular interests in this work: Binary (x)Pb(Mg1/3Nb2/3) O3 - (1-x)PbTiO3 (PMN-PT) piezocrystal, and newly specialized FUS material, …
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Novel Core Technologies and Systems for Magnetic Resonance Compatible Robotics
… and technologies for magnetic resonance imaging (MRI) compatible positioning. The research began as the development of an MRI compatible actuated phantom, which required precise motion through remote actuation. The phantom, which operates from 18 remotely actuated stepper motors, provided motion …
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Design, Development, and Evaluation of a Teleoperated Master-Slave Surgical System for Breast Biopsy under Continuous MRI Guidance
… breast biopsy with a magnetic resonance imaging (MRI) compatible robotic system. MRI provides superior soft-tissue contrast compared to other imaging modalities such as computed tomography or ultrasound and is used for both diagnostic and therapeutic procedures. The strong magnetic field and the …
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A Device Compatible with Functional Magnetic Resonance Imaging for Assessing Brain Activity During a Finger Force Tracking Motor Task
… capable of measuring brain activity using fMRI before and after rehabilitation for hand paralysis. The paradigm is based on a hand motor control task, where subjects alternate between periods of rest and active states. During the active phase, subjects extend their fingers against an …
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A Clearer Picture of Musculoskeletal Disorders of the Knee and Thumb Through the Lens of Image-Based Finite Element Analysis
… goal of this work was to develop a modular MRI-compatible micropipette simulator that could be used for MRI-based FEA of the basilar thumb joint. A modular MRI-compatible micropipette simulator addresses several limitations of pipetting studies, and it can be used to isolate micropipette …
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MRI-compatibility enhancements to USM performance for interventional devices in MR environments
… safe performance of magnetic resonance imaging (MRI)-guided robot-assisted interventions requires full control and high precision of assistive devices and tools. Because many currently available tools are not MRI-compatible, the characterization of existing tools and development of new ones are …
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The influence of methylphenidate on heart rate and brain connectivity
… I used a functional magnetic resonance imaging (fMRI) scanner. To measure the effect of MA on fatigue thresholds, I used a MRI compatible handgrip device which recorded grip force output during a fatiguing handgrip task. To measure HR before and during handgrip exercise I used a MRI compatible …
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OPTICAL COHERENCE TOMOGRAPHY FOR NEUROSURGEY AND CANCER RESEARCH
… mm). In order to address this issue, the first MRI compatible OCT system has been developed. The multi-scale and multi-contrast MRI/OCT imaging combination significantly improves the accuracy of intra-operative MRI by two orders (from 1mm to 0.01 mm). In contrast to imaging systems, a thin …
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DESIGN AND CONTROL OF A ROBOTIC SYSTEM TO ASSIST WITH MRI-GUIDED INTERVENTIONS
… automated mechanisms. Magnetic Resonance Imaging MRI-guided intracardiac intervention under beating-heart conditions is one of such sophisticated operations, which has attracted lots of attention recently. This dissertation focuses on the design, fabrication and control of an integrated robotic …
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Cortical structure: Linking MRI and cytoarchitecture
MRI provides a powerful tool to investigate brain structure in living humans. However a major challenge is interpreting the biological underpinnings of changes at this scale. This dissertation describes investigations into the problem of linking microscale post mortem cortical cytoarchitecture with …
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Identification of Intracranial Lesions With Dual-Energy Computed to mography and Magnetic Resonance Phase Imaging
… On T2*-weighted Gradient Recalled Echo (GRE) MRI, these lesions appear as “foci of susceptibility” in which their signal is hypointense due to the magnetic susceptibility of the lesions differing from that of the background tissue.</p> <p>Dual-energy Computed Tomography (DECT) and …
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Improving Cardiovascular Risk Assessment with CT Coronary Angiography and Myocardial CT Perfusion
… coronary disease. Utilizing a validated CT and MRI compatible perfusion phantom, the sensitivity of CTP and magnetic resonance perfusion were directly compared under various conditions. Despite the distinct physical basis of each technique, the sensitivity and signal-to-noise ratios were …
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Transparent neural interfaces for simultaneous electrophysiology and advanced brain imaging
… techniques like magnetic resonance imaging (MRI) can access deep regions of the brain over a large area and is the state-of-the-art in clinical brain imaging. On the other hand, microelectrode arrays (MEAs) and neural probes are indispensable in deciphering the electrical activity of neurons. …
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Virtual reality visual feedback and its effect on brain excitability
… during functional magnetic resonance imaging (fMRI), and to identify sensory manipulations that could further optimize VR rehabilitation of persons with hemiparesis. In addition, the effects of VR therapy on brain reorganization are investigated. An MRI-compatible VR system is used to provide …