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.
Results
Showing 1 to 20 of 27 for “"MRI-Guided"”.
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Target localization in MRI-guided prostate biopsy
… be performed under magnetic resonance imaging (MRI) guidance. However, needle placements are often inaccurate due to intra-operative prostate motion and the lack of motion compensation techniques. As a result, malignant tumors can be missed, which in turn will lead to an increased number of …
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Instrument guide for MRI-guided percutaneous interventions
As MRI guided interventions are becoming more widely practiced, the goal of this thesis was to design an instrument guidance device for MRI-guided percutaneous interventions in closed bore systems, namely cryoablation procedures where multiple probes need to be placed to treat a tumor. Multiple …
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Towards MRI-Guided and Actuated Tetherless Milli-Robots
Image-guided and robot-assisted surgical procedures are rapidly evolving due to their potential to improve patient management and cost effectiveness. Magnetic Resonance Imaging (MRI) is used for pre-operative planning and is also investigated for realtime intra-operative guidance. A new type of …
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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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Workflow Analysis, Modelling and Simulation for Improving Conventional and MRI-guided Vascular Interventions
… of workflow for multi-modal vascular image-guided procedures (IGPs). Two approaches are employed to analyse the workflow: Discrete Event Simulation (DES) and purpose-oriented physical models. In contrast to previous studies, the proposed methodology looks in detail the actions carried out …
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Sensors and System Integration for Magnetic Resonance Image (MRI)-Guided and Robot-Assisted Interventions
Demand for magnetic resonance image (MRI)-guided interventions and robot-assisted surgeries continues to increase in the field of medical robotics. MRI-guided interventions provide pre-/intra-operative MR images and intraoperative manipulations. Robot-assisted surgeries guarantee higher safety and …
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A Controlled Breathing Intervention for Women Undergoing MRI-Guided Breast Biopsy: A Randomized Controlled Trial
… outpatient medical procedures. The outpatient MRI-guided breast biopsy is one setting where patients may particularly benefit from breathing interventions for pain. To date, however, no studies have examined interventions for pain reduction in this setting. This randomized controlled pilot …
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Design and evaluation of linear intracavitary ultrasound phased array for MRI-guided prostate ablative therapies
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Advances in targeted chemotherapy using MRI-guided focused ultrasound to disrupt the blood-brain barrier
… of the brain and magnetic resonance imaging (MRI) to guide and monitor the procedure. The purpose of this thesis was to develop a technique using MRI-guided focused ultrasound for trans bbb drug delivery applications. This thesis demonstrates that MRI-guided focused ultrasound can be used to …
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Personalized Multimodal MRI-Guided Theta Burst Brain Stimulation for Effective Memory Enhancement in Mild Cognitive Impairment
… illustrating that Diffusion Tensor Imaging (DTI)-guided methods provide more consistent outcomes than those guided by resting-state fMRI. This underscores the critical importance of precision in personalizing rTMS therapy to enhance treatment efficacy. Additionally, the responsiveness of rTMS in …
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Development of positioning devices for MRI-guided high intensity focused ultrasound (HIFU) for abdominal, thyroid and brain, tumours
… power ultrasound transducers compatible with the MRI scanner which is used to monitor these non-invasive HIFU applications. New technologies, combined with more sophisticated treatment methods and monitoring methods allow non-invasive procedures in many areas such as the brain, eye, breast, …
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Novel Tools for Interventional Magnetic Resonance Imaging
Magnetic Resonance Imaging (MRI) provides unique advantages such as superior soft tissue contrast, true multiplanar imaging, variable contrast mechanisms, measurement of temperature changes, perfusion and diffusion, and no ionizing radiation. Despite considerable research efforts in the field of …
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Comparison of radiographic guidance to magnetic resonance imaging guidance for injection of the collateral ligaments of the distal interphalangeal joint in an equine cadaver model
… joint using magnetic resonance imaging (MRI) versus radiographic guidance. Equine cadaver digit pairs (n=10) were divided by random assignment to injection of the ligament by either technique and assessed using post-injection MRI or gross sections. Images from the proximal, middle, and …
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Development of Gold-Magnetite Hybrid Nanoparticles for Advanced Radiotherapy
… as innovative theranostic nanotools for imaging-guided radiosensitization of cancers. H-NPs are designed to exert a dual function: (i) to provide contrast enhancement in magnetic resonance imaging (MRI).and (ii) to enhance radiation effects in the cancer. The imaging and the radiosensitization …
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Accuracy of Open MRI for Guiding Injection of the Equine Deep Digital Flexor Tendon within the Hoof
… diagnosed using magnetic resonance imaging (MRI) in horses with foot pain. The prognosis for horses with DDFT lesions to return to previous levels of performance is poor. Treatment options are limited; consisting of conservative therapy, desmotomy of the accessory ligament of the deep digital …
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Small Solutions to Big Problems: Design and Synthesis of Nanoparticles for Biomedical Applications
… during gradient echo magnetic resonance imaging (MRI) thermometry was successfully designed using magnetic iron oxide nanoparticles to improve the clinical efficacy of MRI-guided focused ultrasound surgery (MRI-FUS). While the critical nanoparticle design criteria may change depending on the …
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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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Renal Cryoablation: Investigation of Periprocedural Visualization to ols and Treatment Response Quantification
… with image guidance from CT, ultrasound, and MRI. During the MRI-guided cryoablation procedure, the interventional radiologist visually compares the iceball size on monitoring images with respect to the original tumor on separate planning images. The comparisons made during the monitoring step …
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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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