Doctor of Medical Physics (DMP)
Health Physics and Diagnostic Sciences
First Committee Member
Second Committee Member
Third Committee Member
Fourth Committee Member
Fifth Committee Member
Sixth Committee Member
Number of Pages
HyperArc is a radiation therapy planning technique using stereotactic radiosurgical doses delivered via single isocenter volumetric modulated arcs (VMAT) for multi-lesion brain cancer. Due to the nature of these types of treatments it is imperative that the proper quality assurance is completed to ensure the safety of the patient. Geometric limits were assessed using a dose volume histogram (DVH) and known rotational errors of theoretical lesions of different dimensions and lengths from the isocenter. Dosimetric comparisons were evaluated using an ion chamber and Gafchromic EBT-XD film and portal dosimetry. The conclusions from these investigations were that patient rotation will result in a loss of target coverage, which is emphasized for smaller targets and isocenter placement farther away from the lesion. The use of a six degree of freedom (6DoF) couch for set-up and surface tracking during beam delivery reliably positions patients to avoid positioning errors that would degrade treatment outcomes. HyperArc is a user-friendly clinical tool that can be confidently used in a clinical setting when the limitations are well known to the user.
LINAC-SRS; Radiation Therapy; set-up error; single isocenter multiple target technique; stereotactic radiosurgery (SRS); VMAT
Medicine and Health Sciences
University of Nevada, Las Vegas
Rickels, Emma S., "Characterization of Physical and Dosimetric Aspects of SRS HyperArc Treatment Technique" (2022). UNLV Theses, Dissertations, Professional Papers, and Capstones. 4462.
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