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Full-Text Articles in Other Medical Sciences
In-Vivo Ct Dosimetry During Virtual Colonoscopy, Jonathon W. Mueller
In-Vivo Ct Dosimetry During Virtual Colonoscopy, Jonathon W. Mueller
Dissertations & Theses (Open Access)
Virtual colonoscopy (VC) is a minimally invasive means for identifying colorectal polyps and colorectal lesions by insufflating a patient’s bowel, applying contrast agent via rectal catheter, and performing multi-detector computed tomography (MDCT) scans. The technique is recommended for colonic health screening by the American Cancer Society but not funded by the Centers for Medicare and Medicaid Services (CMS) partially because of potential risks from radiation exposure. To date, no in‐vivo organ dose measurements have been performed for MDCT scans; thus, the accuracy of any current dose estimates is currently unknown.
In this study, two TLDs were affixed to the inner …
Clinical Impact Of Couch Top And Rails On Imrt And Arc Therapy, Kiley B. Pulliam
Clinical Impact Of Couch Top And Rails On Imrt And Arc Therapy, Kiley B. Pulliam
Dissertations & Theses (Open Access)
Purpose: To evaluate the clinical impact of the Varian Exact Couch on dose and volume coverage to targets and critical structures and tumor control probability (TCP) for 6-MV IMRT and Arc Therapy.
Methods: Five clinical prostate patients were planned with both, 6-MV 8-field IMRT and 6-MV 2-field RapidArc using the Eclipse treatment planning system (TPS). These plans neglected treatment couch attenuation, as is standard clinical practice. Dose distributions were then recalculated in Eclipse with the inclusion of the Varian Exact Couch (imaging couch top) and the rails in varying configurations. The changes in dose and coverage were evaluated using the …