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 “"Portal imaging"”.
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Transit Dosimetry for Patient Treatment Verification with an Electronic Portal Imaging Device
… treatment. Amorphous silicon (aSi) Electronic Portal Imaging Devices (EPIDs) can be utilized for IMRT verification. The goal of this thesis is to implement EPID transit dosimetry, measurement of the dose at a plane behind the patient during their treatment, within the clinical process. In order …
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Real Time Prostate Motion Tracking Using the Portal Imaging Device in Radiation Therapy
Intrafractional motion management is the key step in image-guided radiation therapy. Prostate location can change vastly during treatment. This work is to provide a way to implement and facilitate real-time MV tumor surrogate tracking of the fiducial marker implanted for prostate cancer treatment. …
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Portal Imaging Using a CSI (TL) Scintillator Coupled to a Cooled CCD Camera
… was to design a high performance digital portal imaging <br />system, using a transparent x-ray scintillator coupled to a cooled CCD camera. Theoretical <br />analysis using Monte Carlo simulation was performed to calculate the QDE, SNR and DQE of <br />the system. A prototype electronic …
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Robust and efficient process for acceptance testing of radiation therapy machines
… radiation therapy machines using the electronic portal imaging device (EPID). The project aimed to 1) show that the variability in EPID response can be normalized and that EPID can be used for correlating beam energy changes, 2) show that AT of a linac can be automated and can be performed using …
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2d dose measurement using a flat panel EPID
… the use of an amorphous silicon electronic portal imaging device (a-Si EPID) to complement the film. The dosimetric behaviour of the device is studied both experimentally and numerically using the EGSnrc Monte Carlo simulation routine. The intrinsic build-up of the flat panel EPID was found …
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Effects of Advanced Radiotherapy techniques on Normal Tissue Toxicity in Breast Cancer
… tumour bed PTV margins as compared to standard portal imaging. The use of clip-based IGRT had a small but significant reduction on the heart dose, especially for left sided breast cancer patients. The NTCP model for breast fibrosis suggests that for moderate-severe fibrosis, the breast tissue …
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Modelling geometric uncertainties in prostate radiotherapy
… are used todetermine prostate position from portal images. Seed based portal imaging is found tobe an effective method for IGRT for patients in all arms of the trial.Two techniques for modelling prostate shape are investigated. To analyse patterns ofobserver variability a method is developed …
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Reducción de ruido en Imagen Portal mediante técnicas de Wavelet
… estudiado la mejora de la calidad de la imagen portal, siendo el objetivo principal la reducción de ruido. La imagen portal se estudia en el dominio wavelet para comprobar en qué medida se asemejan sus propiedades estadísticas a las encontradas en imagen natural. El mismo estudio llevado a cabo …