Medicine and Health Sciences Commons^™

Dosimetric Evaluation Of Left-Sided Chest Wall Vmat Treatment With And Without Jaw Tracking; Dose Comparison Of Left Anterior Descending Artery Versus Heart Mean Dose, Jacqueline J. Emus

Culminating Experience Projects

Radiation therapy has significantly improved breast cancer survival rates; however, it can still lead to long-term side effects, particularly affecting the heart. Left-side breast cancer patients face higher risks due to the proximity of the heart to the treatment area. To mitigate cardiac toxicity, various strategies, including jaw tracking and Volumetric Modulated Arc Therapy (VMAT), have been proposed. This study investigates the dosimetric impact of VMAT plans with and without jaw tracking on the left anterior descending artery (LAD) dose and heart mean dose in post-mastectomy breast cancer patients. Ten patients previously treated with VMAT were evaluated, and the results …

A Retrospective Comparison Of Dose Distribution Within Density Override And Avoidance Structures In Volumetric Arc Therapy Prostate Plans With Hip Prosthetics: A Dosimetric Evaluation, Jared Richard Brinkman

Culminating Experience Projects

Introduction

Prostate cancer is one of the most common cancers among men, and its incidence is a significant health concern. The optimal radiation treatment for prostate cancer patients needs to be tailored to reduce toxicities to organs at risk within the treated area. This study aims to retrospectively evaluate the dose distribution to organs at risk (OARs) in patients with hip prosthetics for volumetric modulated arc therapy (VMAT) prostate cancer plans.

Methods

The study included ten prostate cancer patients with at least one prosthetic hip who received VMAT plans at a Midwest Radiation Oncology Center. Various data points, including target …

A Dosimetric Comparison Of Jaw Tracking Versus Non-Jaw Tracking Using 6mv Vmat Treatment Beams In Prostate Patients With Involved Lymph Nodes, Rebecca Todd

Culminating Experience Projects

Introduction:

Jaw tracking is the process of the collimator jaws dynamically following the multileaf collimators during modulated therapy. Jaw tracking can be used throughout the dosimetry treatment planning process for IMRT and VMAT treatment plans. It can reduce a patient’s OAR dose by reducing low dose spillage from MLC interleaf leakage. This study aims to investigate if jaw tracking reduces OAR dose while maintaining PTV coverage in prostate patients with involved lymph nodes using 6MV VMAT treatment planning technique.

Methods:

This is a quantitative study of 10 patients. For each patient, two plans were created, one plan using a non-jaw …

A Quantitative Investigation Of Treating Lung Tumors With Dynamic Conformal Arcs Vs. Vmat For Lung Sbrt Plans, Shawn Loutos

Culminating Experience Projects

Introduction

This study aims to investigate the comparisons in dynamic conformal arc, VMAT (no ASC), forced MU limitations (ASC), or a 50/50 hybrid arc (ASC) in how they can improve a lung SBRT case where the tumor is abutting a dose critical structure. The goal of this research is to investigate multiple treatment techniques in an attempt to increase the dose constraint pass rate. The variables in comparison are how well different plan iterations can successfully meet constraints as well as pass a 0.5 modulation complexity score (MCS).

Methods

10 previously treated patients were used in this study who exhibited …

Plan Quality Comparison Between Cyberknife And Vmat Lung Sbrt After Modified Cyberknife Treatment Times., Lindsey Money

Culminating Experience Projects

Introduction

This retrospective study will aim compare Cyberknife SBRT and VMAT SBRT lung plans quality when the Cyberknife plans are replanned to have a comparable treatment time to the VMAT plans. Having data to show the difference in plan quality between the two treatment techniques could be a useful tool when deciding the best treatment option.

Methodology

Select ten SBRT lung patients who were all treated using the Cyberknife and plan a comparable VMAT treatment for each. Modify the original Cyberknife treatment plan so that the treatment time is similar to that of the corresponding VMAT plan. Then, evaluate and …

A Qualitative Dosimetric Comparison Of Helical Tomotherapy, Coplanar Volumetric Modulated Arc Therapy, And Non-Coplanar Volumetric Modulated Arc Therapy For Radiotherapy Of Centrally Located Brain Tumors, Robert Hayward

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Abstract Introduction The purpose of the work is to see if there is a dosimetric benefit to using one treatment modality over another when treating centrally located brain tumors. These modalities include helical tomotherapy, non-coplanar VMAT, and coplanar VMAT. Methods Thirty plans were created from ten previously treated patient’s datasets. All patients were planned using a simultaneously integrated boost with a PTV54 and PTV 60. The conformity index and homogeneity index were compared for targets. Dose maximums and means were compared for critical structures between the plans and modalities. Results A significant difference was found for the conformity index for …

Dosimetric Effect When Treating Multiple Lesion Srs Using Vmat With And Without Jaw Tracking, Mindy Bui

Culminating Experience Projects

The main purpose of this study was to determine if jaw tracking or non-jaw tracking is the superior technique for patients with multiple brain metastasis that are treated with Volumetric Modulated Radiation Therapy (VMAT) Stereotactic Radiosurgery (SRS). Doses to the organs at risk (OAR) and the target volumes were analyzed using the dose volume histogram (DVH) and dose statistics for each plan. The goal of this study included analyzing the dosimetric effect on the organs at risk and the normal tissue when using jaw tracking versus non jaw tracking. The pros and cons for each technique were identified as well …

Analysis Of Ptv Margins For Vmat Treatment Of Rectal Cancers Utilizing Prone Bellyboard Device., Ben Armbuster

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Utilization of a bellyboard device reduces small bowel dose for patients receiving radiation therapy for rectal cancer. The reduction of small bowel dose with the bellyboard is even more significant in intensity modulated radiation therapy rectal treatments, as opposed to conventional 3D treatments. However, there is evidence of increased setup variation with prone bellyboard positioning, especially in pitch and roll. The purpose of this study is to determine the margin needed between the clinical target volume and the planning target volume to adequately account for these setup variations when planning volumetric modulated arc therapy rectal cases utilizing the bellyboard device. …