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 11 of 11 for “"Organ Motion"”.
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Inclusion of organ motion in IMRT optimization using probabilistic treatment planning
… ein Verfahren zur Berücksichtigung von Organbewegungen in der Bestrahlungsplanung für die fraktionierte intensitätsmodulierte Strahlentherapie (IMRT). Organbewegungen werden durch ein mathematisches Modell beschrieben welches die Grundlage der Bestrahlungsplan-Optimierung darstellt. Das …
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Intensity Modulated Proton Therapy Optimization Under Uncertainty: Field Misalignment and Internal Organ Motion
… uncertainty, range uncertainty and internal organ motion. These uncertainties can greatly impact the quality of clinical treatment. Therefore, this dissertation aims to investigate different optimization methods for treatment planning and to handle a variety of uncertainties in IMPT. First, …
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A Free-Breathing Lung Motion Model
… from error in delivery of radiation due to organ motion during breathing remain a significant issue. To compensate the breathing motion during the treatment, a free breathing lung motion model, x= x0+αv+βf, was developed and discussed, where x is the position of a piece of tissue located at …
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Development and application of a multi-modality inverse treatment planning system
… no significant differences in the effect of organ motion and particle range uncertainties are observed for either technique.
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Evaluation of target motion and determination optional treatment margins for prostate cancer treated with external beam radiotherapy on Halcyon
… treatment for prostate cancer. To account for organ motion and set-up error, margins are used in radiotherapy planning. These are essential for the delivery of safe and effective treatment. Aim and Setting To measure prostate motion during the course of EBRT on the HalcyonTM at Groote Schuur …
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Transcostal focused ultrasound surgery: treatment through the ribcage
… focused ultrasound surgery (FUS) are the organ motion caused by cardiac and respiratory movements and the presence of the ribcage. Intervening ribs absorb and reflect the majority of ultrasound energy excited by an acoustic source, resulting in insufficient energy delivered to the target …
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Improvements In Robustness and Optimality of Intensity-Modulated Proton Therapy Plans For Lung Cancer Patients With 4-Dimensional Robust Optimization
… of uncertainties associated with breathing motion in treatment planning. The primary objective of this research was to develop a novel four-dimensional robust optimization (4DRO) method and find an appropriate optimization strategy to make IMPT dose distributions less sensitive to both …
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Ai-Enabled Online Plan Adaptation For Mr-Guided Stereotactic Ablative Radiotherapy (Sabr) of Head and Neck Cancer
… anatomical changes, and intra-/inter-fraction organ motion. The emergence of MR-guided adaptive radiotherapy (ART) has the potential to further improve the SABR of HNC, by providing superior visualization of soft tissue and enabling real-time plan adaptation based on the daily anatomical …
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Accumulating delivered dose to the rectum to improve toxicity prediction in prostate radiotherapy
… dose data and do not consider the effects of organ motion on true delivered dose. The VoxTox research programme has developed automated solutions for segmentation and dose calculation of the rectum for prostate cancer patients being treated with helical TomoTherapy. Daily image guidance scans, …
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Motion Estimation and Motion-Compensated Reconstruction for Four-Dimensional Cone Beam Computed Tomography (4D-CBCT)
… higher accuracy for tumor localization. For organs influenced by the respiration, respiration induced motion becomes the principal cause for tumor localization uncertainty and four dimensional (4D) cone beam computed tomography (CBCT) has been developed to locate tumor in each respiration …