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 23 for “"Patient Positioning"”.
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Assessment of and improvements to a stereophotogrammetric patient positioning system for proton therapy
… (NAC) as used to both immobilise and position patients for precision proton radiotherapy. The precision achieved using the stereophotogrammetric (SPG) positioning system is measured, and the shortcomings and errors in using the facemask by the SPG system are measured and analysed. The …
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The development of a real-time photogrammetric system for patient positioning in proton therapy
… of a real-time photogrammetric system for the positioning of patients undergoing proton therapy. The positioning of patients involves moving their tumours into a horizontal proton beam. In the past, patients have been mechanically positioned and restrained. However, with the development of this …
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Linear regression analysis of 2D projection image data of 6 degrees-of-freedom transformed 3D image sets for stereotactic radiation therapy
Patient positioning is crucial to accurate dose delivery during radiation therapy to ensure the proper localization of dose to the target tumor volume. In patient positioning for stereotactic radiation therapy treatment, classical image registration methods are computationally costly and imprecise. …
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Image Registration to Map Endoscopic Video to Computed to mography For Head and Neck Radiotherapy Patients
… video to radiotherapy treatment plans for patients with head and neck cancer without physical tracking of the endoscope during the examination. Endoscopy-CT registration would provide a clinical tool that could be used to enhance the treatment planning process and would allow for new …
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Robust Treatment Planning and Robustness Evaluation for Proton Therapy of Head and Neck Cancer
… expansion approach. During radiation treatment, patients are prone to present anatomical variations during the treatment course, which can be random deviations in patient positioning, as well as treatment-induced tumor shrinkage and patient weight variations. For IMPT plans using a PTV margin …
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Medical room design for a fission converter-based boron neutron capture therapy facility
… entrance into the room, a viewing window, and patient positioning system. From the shielding analysis the amount of high density concrete needed to reduce the dose rate outside the walls of the room to 1 mrem/hr was calculated. The side walls and ceiling need 73 cm of Ilmenite I-2a concrete and …
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The Effect of Oral Care on Intracranial Pressure in Critically Ill Adults
A major goal in the care of patients with neurological problems is to prevent or minimize episodes of increased intracranial pressure (ICP). Elevations in ICP in response to nursing interventions have been acknowledged since the 1960’s when ICP monitoring was first introduced in the clinical …
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End-to-end testing of the Leksell Gamma Knife Icon system
… A titanium-alloy frame affixed to the skull of a patient before each treatment has defined the stereotactic coordinate system of previous gamma knife models, as well as provided complete patient immobilization during treatment. However, the newest gamma knife model from Elekta, the Icon, …
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Operacinėje dirbančių slaugytojų komandinio darbo iššūkiai /
… continuous communication, assisting each other, patient well-being, and service continuity as key aspects. Additionally, consequences of stress on teamwork during surgeries were highlighted: avoidance of communication, negative emotions, surgery duration, errors. Participants emphasized factors …
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Comprehensive MRI Safety Assessment: Impact of Strain-Relief Loop Position, Lateral Movement, and Varying Field Strengths on RF-Induced Heating of Medical Implants
… to RF-induced hazards to ensure the safety of patients. This dissertation focuses on three factors critical to the RF-induced heating hazards of implantable medical devices (IMDs). First, the impact of strain relief loop positions on RF heating of AIMDs at 1.5T MRI is studied. The AIMDs are …
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A Study of Craniofacial Asymmetry in Monozygotic and Dizygotic Twins Using Posteroanterior Radiographs
… line. Two methods of evaluating subjects' head positioning were used and compared. Any subject that was found to have excessive rotation of their head was excluded from the sample. After a preliminary analysis it was found that the horizontal distances were strongly correlated to patient …
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An Evaluation of the Limitations of the Technique of Dual Energy Absorptiometry in the Measurement of Bone Disease.
… (DEXA). This study examines the results from patients scanned on both Novo Lab 22a (DPA) and Hologic QDR 1000 (DEXA) machines used at this hospital and gives a high correlation coefficient (r = 0.96, p=<0.001).A comparison was made of previous studies on precision values. To convey the …
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ABDOMINAL PRESSURE PROFILING IN ADULT HORSES
… ketamine, guaifenesin guaiacolate) to facilitate patient positioning. All hemodynamic and abdominal pressures were measured with horses in left lateral/right lateral (LR) and dorsal recumbencies (DR). We demonstrated that flank IAP was subatmospheric and significantly lower than ventrum IAP in …
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Radiomic Analysis of Sonograms for the Detection of Tendon Damage
… to changes in ultrasound transducer operation or patient positioning. To circumvent these limitations, imaging of an ex vivo tendon will be conducted simultaneously with loading in this study. A total of 14 juvenile, female porcine superficial digital flexor tendons were excised and loaded using …
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Modeling and Development of Iterative Reconstruction Algorithms in Emerging X-ray Imaging Technologies
… to obtain better diagnostic images and accurate patient positioning information in image-guided radiation therapy for CBCT in a few minutes, two accelerated variants of the FISTA for PLS-based image reconstruction are proposed. The algorithm acceleration is obtained by replacing the original …
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Outcome Analysis of Helmet Therapy and Counter Positioning for Deformational Plagiocephaly
… effectiveness between helmet therapy and counter positioning for deformational plagiocephaly (DP). METHOD: Retrospective data of children diagnosed with DP who visited our clinic from November 2010 to October 2012 were reviewed. The subjects who were 10 months of age or younger, and showed 10 mm …
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Cone Beam Computed Tomography - radiation dose and image quality assessments
… variety of machines differing in many respects: patient positioning, volume size (FOV), radiation quality, image capturing and reconstruction, image resolution and radiation dose. When new technology is introduced one must make sure that diagnostic accuracy is better or at least as good as the …
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Ultrasound and photoacoustic methods for anatomic and functional imaging in image guided radiation therapy
… with and exceeding acceptable clinical patient re-alignments (2 mm). Statistical errors from US-US registrations for different patient orientations ranged from 0.06-1.66 mm for x, y, and z translational components, and 0.00-1.05 degrees for rotational components. Statistical errors from …
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Role of workplace based assessment of radiographers in informing curriculum development practices: a plain X- ray film technical sufficiency exemplar using 2010 post- registration radiographers.
… these radiographers, which may culminant in poor patient management outcomes due to misdiagnosis resulting from poor radiography services. To establish concordance between curriculum output and clinical practice requirement, curriculum developers need to take into consideration the performance of …
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The Role of Cell Sterilization In Population Based Studies of Radiogenic Second Cancers Following Radiation Therapy
… their effectiveness. In this respect, pediatric patients are of specific interest because of their sensitivity to radiation induced second cancers. However, due to the rarity of childhood cancers and the long latency of second cancers, large sample sizes are unavailable for the epidemiological …
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