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Design And Optimization Of Four-Dimensional Cone-Beam Computed Tomography In Image-Guided Radiation Therapy, Moiz Ahmad

Dissertations & Theses (Open Access)

The influence of respiratory motion on patient anatomy poses a challenge to accurate radiation therapy, especially in lung cancer treatment. Modern radiation therapy planning uses models of tumor respiratory motion to account for target motion in targeting. The tumor motion model can be verified on a per-treatment session basis with four-dimensional cone-beam computed tomography (4D-CBCT), which acquires an image set of the dynamic target throughout the respiratory cycle during the therapy session. 4D-CBCT is undersampled if the scan time is too short. However, short scan time is desirable in clinical practice to reduce patient setup time. This dissertation presents the …

Coherent Scatter Computed Tomography For Core Composition Analysis Of Intact Kidney Stones - Prospective Clinical Study, Cristian Dihel

Electronic Thesis and Dissertation Repository

Urolithiasis is the presence of urinary calculi (urinary stones) at any level along the excretory system. Establishing accurate and complete mineral composition of the stones is one of the main factors in deciding the best steps for therapy and recurrence prevention.

Currently, infrared spectroscopy (IRS) and x-ray diffractometry (XRD) provide bulk composition results of urinary calculi in powdered form. Clinicians use the results to prescribe medical and dietary measures to restore the physiologic chemical balance of urine or rather alter it for the purpose of decreasing the crystallization rate of single or multiple minerals. As current methods have been shown …