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 8 of 8 for “"MRI Thermometry"”.
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Design of control systems for focused and unfocused intracavitary ultrasound arrays for the thermal treatment of prostate disease
… has clear benefits, this work shows that, with MRI thermometry, the ti.me delay in the temperature feedback loop is sufficient to make any method of system identification difficult within the ti.me constraints of a clinical setting. A proportional plus integrator plus derivative (PID) controller …
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Feedback Control of Phased Array Electromagnetic Hyperthermia Using MRI Temperature Mapping
… of microwave hyperthermia using noninvasive MRI thermometry. The following developments are reported here: (1) An integrated MR-microwave hyperthermia system intended for small animal studies was designed and built. (2) A new technique is presented that allows noninvasive mapping of the …
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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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Feasibility of a predictive model of Hsp70b-activated gene therapy protein expression during ultrasound hyperthermia
… via ultrasound-induced hyperthermia monitored by MRI thermometry. We first demonstrated that gene therapy-mediated gene expression could be spatially and temporally controlled with this method. Further studies were subsequently performed to determine if the activation of a particular …
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Propagation of High Intensity Focused Ultrasound through a Patient-specific Ribcage Model
… was monitored by magnetic resonance imaging (MRI) thermometry. Sonications on phantom with varied focal lengths and ribcage locations using robotic arm were performed. Thermometry revealed that heating at focus can be controlled either by changing power or duration of application in order to …
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Shear-wave imaging guidance for high-intensity focused ultrasound therapy
… for real-time HIFU temperature monitoring (MRI thermometry). In contrast, medical ultrasound guidance technique for HIFU still relies mostly on B-image mode and the hyperechoic contrast of the HIFU lesion. Additionally, commercial MR thermometry is relatively expensive, and is not truly 2D …
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Real time motion tracking in image guided focused ultrasound intervention
… performed under both diagnostic ultrasound and MRI guidance. Treating cancers and metastases in the liver that are unresectable is a potential application for FUS. However the respiratory motion hindered FUS treatment of liver to become a completely non-invasive technique. The method is …
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Development of MR Thermometry Strategies for Hyperthermia of Extremity and Breast Tumors
… This can be achieved noninvasively with MR thermometry. However, there are many challenges to performing MR thermometry in the breast, where hyperthermia of locally advanced breast cancer can provide a benefit. These include magnetic field system drift, fatty tissue, and breathing …