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 39 for “"Fluoroscopy"”.
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Rigid registration of MR and biplanar fluoroscopy
… registration contexts, including that of CT-fluoroscopy registration. The similarity measures are evaluated by probing the space of transformations between the coordinate frames of an MR volume and biplanar, digitally-reconstructed radiographs (DRRs) produced from a corresponding CT volume. …
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An automated matching algorithm for dual orthogonal fluoroscopy
The current method of studying in vivo kinematics of human joints is a tedious and time consuming task. Current techniques require the segmentation of hundreds of raster images, often by hand, and registration of three-dimensional models with two-dimensional contours. Automation of these processes …
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Assessment of Bidirectional Compatibility between a Novel Magnetic Tracking System and C-Arm Fluoroscopy
Fluoroscopy is an X-ray-based medical imaging technique that is commonly used for guiding surgical interventions. The 2D projective nature of this modality is inherently associated with the loss of depth projection, making accurate placements of surgical instrumentation challenging. The integration …
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A 3D neuromuscular model of the human ankle-foot complex based on multi-joint biplanar fluoroscopy gait analysis
… the human ankle-foot complex based on biplanar fluoroscopy gait analysis is presented. Biplanar fluoroscopy (BiFlo) enables three-dimensional bone kinematics analysis using x-ray videos and bone geometry from segmented CT. Hindered by a small capture volume relative to traditional optical motion …
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Relationships between lumbar inter-vertebral kinematics and paraspinal myoelectric activity during sagittal flexion: a quantitative fluoroscopy and surface electromyography study
… with a hidden kinematic chain. Quantitative fluoroscopy (QF) is an imaging technology capable of measuring continuous spinal kinematics at the inter-vertebral level, and surface electromyography (sEMG) provides a non-invasive means of objectively quantifying muscle activity. This study used …
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Registration of Tomographic Images to X-ray Projections for Use in Image Guided Interventions
… during an intervention which is guided using 2D fluoroscopy images. <br/><br/>An algorithm has been designed to obtain the pose of a CT volume with respect to a single fluoroscopy image. The registration algorithm is based on the production of digitally reconstructed radiographs from the CT …
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An Evaluation of passive recumbent quantitative fluoroscopy to measure mid-lumber intervertebral motion in patients with chronic non-specific low back pain and healthy volunteers.
… methods, and errors in measurement. Quantitative fluoroscopy (QF) reduces variation and error and measures dynamic intervertebral motion in vivo. This thesis used recumbent QF to examine continuous mid-lumbar intervertebral motion (L2 to L5) in patients with assumed mechanical chronic non-specific …
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Exploration of Motion Capture System to Investigate Human Shoulder Kinematics
… systems and its validation against bi-planar fluoroscopy remains relatively unexplored.</p> <p>This study employed a marker-based MOCAP system to compare the accuracy, error, and precision of three distinct in vivo tracking methods against the COR position identified via bi-planar fluoroscopy. …
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Localization of Human Pelvis Anatomical Coordinate System Using Ultrasound Registration to Statistical Shape Model
… system (PaCS) is to use intra-operative X-ray fluoroscopy in a specialized interventional radiology facility to guide the procedure. Employing intra-operative ultrasound (US) imaging fused with pre-operative CT scan or fluoroscopy imaging was proposed to eliminate the ionizing radiation of …
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Ανίχνευση όψιμου κατάγματος ενδοστεφανιαίας πρόθεσης σε ασυμπτωματικούς ασθενείς μετά την εμφύτευση επικαλυμμένων με sirolimus ενδοστεφανιαίων προθέσεων και μη επικαλυμμένων ενδοστεφανιαίων προθέσεων με ψηφιακή ακτινοσκόπηση
… ασυμπτωματικών ασθενών χρησιμοποιόντας την FPDD fluoroscopy, με 200 SES (Cypher, Cordis, J&J, Miami, Florida, US) και 200 μη επικαλλυμένων stents (BMS) σε ένα διαστήμα 45.5 ± 15.7 και 38.4 ± 3.9 μηνών αντίστοιχα μετά την εμφύτευση. Το SF ορίστηκε ως η μή συνέχεια του πλέγματος του stent στην …
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The design and prototyping of a Transcatheter Aortic Valve Implantation training system specific for aortic valve regurgitation.
… orthogonal projection of the aortic root using fluoroscopy and following the right cusps rule, each trunk is positioned in an aortic leaflet cusp to keep relative motion between the delivery device and the heart, and to locate the valve axially and rotationally. Once the trunks are in position …
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Radiation dose optimization in interventional radiology and cardiology using diagnostic reference levels
… to license holders of interventional fluoroscopy units, requiring that a medical physicist optimize their radiation usage using DRLs. The Dose Area Product (DAP) quantity measured for each patient represents a dosimetry index, the value of which for the purpose of improvement should be …
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Mitral insufficiency due to ruptured chordae tendineae
… and phonocardiographic features are specific. On fluoroscopy readily recognizable paradoxical pulsation of the left atrium was present in some of them. At cardiac catheterization a tall left atrial “v” wave with peak pressure as high as or higher than the peak pressure in the pulmonary artery was …
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Evaluation of the anatomical accuracy of the neuronavigation system “StealthStation” in neurosurgical operations
… any of the percutaneous methods) using only fluoroscopy is a significant problem in some cases, due to various possible reasons, i.e. inadequate visualization of the FO, presence of anatomical variations (smaller size, intraforaminal bony ridges or ossified pterygospinous/pterygoalar …
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Biomechanical Effects of Manual Therapy in Patients with Acute Non-specific Low Back Pain – A Feasibility Study.
… and recumbent flexion and extension quantitative fluoroscopy sequences. Continuous intervertebral motion variables included range of motion, disc height, translation, initial attainment rate, motion sharing inequality and variability. Patient Reported Outcomes Measures of Bournemouth Questionnaire …
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Deep Photoacoustic Imaging and Acoustic Cavitation Mapping in Shockwave Lithotripsy
… imaging modalities used in SWL (e.g., C-arm fluoroscopy and B-mode ultrasound) are not sensitive to vascular injuries. To better understand the mechanism of tissue injury and improve treatment safety and efficiency, it is highly desirable to concurrently detect cavitation and vascular injury …
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Radiofrequency ablation versus cryoablation in the treatment of atrioventricular nodal reentrant tachycardia
… such as acute success rate, procedure time, fluoroscopy time, and recurrence of AVNRT. Recurrence of AVNRT has been observed as far as 10 years after RF ablation. In patients with a history of RF ablation for AVNRT, rates of atrial fibrillation are higher than that of the general population. …
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Giving birth to a new approach: a retrospective comparison of radiation safety parameters between transradial and transfemoral approaches for uterine fibroid embolization at Groote Schuur Hospital, South Africa
… compare the mean radiation dose and accumulative fluoroscopy time between TRA and TFA UAEs performed for the treatment of uterine leiomyomas. Method A single-institution retrospective study was conducted on all female patients having undergone UAE for symptomatic uterine leiomyomas at GSH between …
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The biomechanics of the knee following injury and reconstruction of the posterior cruciate ligament c Louis DeFrate.
… flexed their knees as they were imaged using fluoroscopy from two orthogonal directions. The models and orthogonal images were imported into a solid modeling software and used to reproduce the kinematics of the knee as a function of flexion. From these models, the three- dimensional …
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Assessment of Normal Knee Kinematics Using High-Speed Stereo-Radiography System
… using other measuring techniques like dual plane fluoroscopy. The goal of this thesis is to use high-speed stereo radiography (HSSR) system for measuring joint kinematics in healthy older adults performing common movements of daily living such as straight walking and during higher demand …
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