2022 Annual Meeting Poster Presentation

A Dosimetric Comparison of Head and Neck Plans Generated for Linac-based VMAT, linac-based VMAT using Autoplanning Script and a Ring-based IMRT Delivery System
Authors: D Pham, PhD, CMD, RT(T)

Poster Summary: Auto planning scripts can be implemented within a department to assist with freeing up planning resources. The dosimetry is comparable to manually generated linac and ring-based delivery systems. Limitations of the system include long calculations and edge cases.

A Dosimetric Evaluation of Machine Dependent Lattice Radiotherapy Planning Using High-definition MLCs and 6XFFF Beams
Authors: K Lehman; M Mundis, CMD; S Chen, PhD; K Krudys, CMD

Poster Summary: This comparison displays an increase in plan conformality with a sharper dose fall-off utilizing the HD MLCs and 6XFFF beams of the Varian Edge machine.

A Retrospective Comparison of Physician Contours and AutoContour For The Supraclavicular Lymph Nodes, Axilla Lymph Nodes and Breast
Authors: D Granatowicz, MS, CMD; C Rhodd, MS, BSRT

Poster Summary: A comparison between manual physician drawn contours and ones done by Radformation’s AutoContour software for the supraclavicular lymph nodes, axilla lymph nodes, and breast.

Assessing the impact of site-specific KBP models on planning dosimetry
Authors: K Luca, MS, CMD; J Roper, PhD, DABR; J Wolf, CMD; O Kayode, MS, CMD, RT(R)(T); J Bradley, MD, W Stokes, MD; J Zhang, PhD, DABR

Poster Summary: Developing site-specific KBP models leads to significant improvements in plan quality and supports the development of distinct KBP models for specific clinical scenarios.

Comparison of two craniospinal irradiation techniques and evaluating low dose to critical structures
Authors: J Nguyen; I Diaz, CMD, RT; J Niska, MD; Y Borghero, MD; D Fetters, DMP

Poster Summary: A retrospective study comparing 3D/IMRT to VMAT for craniospinal irradiation, evaluating the differences in the treatment techniques and low doses to critical structures.

Craniospinal Irradiation;  Dosimetric Comparison Between Ring-Based vs. Gantry-Based Delivery Systems
Authors: T Ngo, BS; D Pham, PhD, CMD, RT(T); N Kovalchuk, PhD

Poster Summary: RefleXion X1 utilizes a moving couch to allow for single-isocenter technique in pediatric CSI, potentially reducing translational errors associated with multi-isocenter setups.

Diagnostic CT-based treatment planning of bone metastases for simulation-free MR-guided online adaptive radiotherapy
Authors: D Martinez Garcia, BS; A Joseph, BS; B Baker, BS, MA; T Hoang, BS; C Wang, BS; P Castillo, BS, CMD; A Sobremonte, BS, CMD; J Baker, PhD, MEd, CMD; J Yang, PhD

Poster Summary: This study aims to expedite the treatment for bone metastasis patients by analyzing the feasibility of simulation-free treatment. The study uses the MR-Linac, Monaco, and online adaptive planning.

DIBH with Partial Anterior Arc Therapy Improves Dose Distributions in Patients with Anterior Mediastinal Tumors
Authors: A Barbera, BS, CMD; J Antone, BS, CMD; D Carillo AS, RT(T); B Cox, MD; Y Ahmed, MS, CMD; K Vaiday, MS, CMD

Poster Summary: This TX planning combination minimizes the size of the target volume and decreases the dose to OARs when compared to the other planning techniques analyzed.

Dose calculation with Radcalc in lateral electronic non-equilibrium
Authors: J Haider, PhD; T Haider, CMD

Poster Summary: The accuracy of point dose calculations in small fields in Radcalc could be significantly improved by accounting for electronic non-equilibrium in phantom scatter.

Evaluation of Proton Dose Fall-off Optimization Structures
Authors: S Johnson, CMD, MS

Poster Summary: Evaluation of optimization structures used to control dose fall-off in proton planning.

Effects of EZFluence planning software on dosimetric parameter compliance for early-stage breast cancer
Authors: J Loomis, BS; T Gergel, MD

Poster Summary: The purpose of this study is to evaluate the effect that automated planning software for breast plans has on dose constraints to organs at risk.

Evaluation of Different GYN Pelvic Nodal Boost Planning Strategies to Determine the Optimal Planning and Treatment Approach
Authors: C Palomeque; S Basyouni; W Gee; H Wazir; J Sutton, CMD; D Hancock, BS, CMD; C Spicer, CMD; M Dehghanpour, EdD, CMD; Z Yu, PhD

Poster Summary: This study compares specific planning techniques for gynecological pelvic lymph node boost irradiation treatment to determine the most optimal technique and planning strategies.

Evaluation of OAR Sparing in Prostate Radiotherapy Plans Optimized with Database Dose Predictions
Authors: S Robertson, PhD; T McNutt, PhD

Poster Summary: Optimization with predicted dose objectives is more efficient than Auto planning in generating high-quality plans with clinically acceptable OAR sparing.

Non-Reflective Brass Bolus and Surface Guidance
Authors: A Wexler, PhD; J Evans, RT(T)

Poster Summary: Patients with complex body contours who require bolus for treatment can benefit from brass bolus.  The non-reflective brass bolus can be used with the surface guidance camera system.  Knowing the physician preference for bolus thickness, placement, and modality is essential for accurate application and treatment delivery.

Proton vs VMAT Plan Comparison of Patients with Metallic Breast Expander
Authors: A Banskota, RT(T); S Mossahebi, PhD; J Jatczak, CMD; M Steinberg, CMD

Poster Summary: This study shows that the proton plan of breast cancer patients with TE compared to VMAT plan can better spare the critical OARs.

Quantifying the dosimetric impact of target margins in the oligometastatic setting
Authors: J Strang, BS; G Davies, PhD, DABR; C Glide-Hurst PhD, DABR, FAAPM

Poster Summary: A study reviewing the dosimetric impact on total lung dose and other endpoints using various margins on multi-target intrathoracic patients treated with a single isocenter.

Skin conformity and reusability of molded silicone boluses for breast cancer patients with expanders
Authors: J James, BS; A Markovic, PhD, FAAPM

Poster Summary: This study focuses on the feasibility of making a standardized set of silicone boluses that could be reused on breast patients and provide acceptable conformity, precluding the need for manufacturing a custom bolus per patient. The study was done using phantom breasts and various sizes of molded silicone breast boluses.

The Comparison of Collapsed Cone and Monte Carlo Algorithms in Tangential Breast Planning
Authors: M Goss, MS, DABR

Poster Summary: The Comparison of Collapsed Cone and Monte Carlo Algorithms in Tangential Breast Planning

The Impact of Arc Geometry on Lung SBRT Plan Quality
Authors: T Hamilton, MBA, RT(R)(T)(CT); J Wolf, CMD; J Roper, PhD, DABR

Poster Summary: Noncoplanar-oblique arc arrangements deserve the most consideration when a more simplistic arc arrangement is inadequate at sparing critical OAR’s in lung SBRT treatment planning.

The impact of arc spacing angles on plan quality in VMAT plans
Authors: J Nguyen; Q Wang, PhD; L Ta; A Valdez; J Ohrt, MS, DABR; D Hancock, BS, CMD; L Simmons, MS, CMD

Poster Summary: This study investigated the effects of larger gantry arc spacing on target coverage, OAR dose, homogeneity, MUs, and integral dose for a variety of sites.

Utilizing a Novel Calculator to Evaluate the Risk of Acute Cardiac Events After Breast Conserving Surgery or Mastectomy for Patients Receiving Supine Radiation Therapy Without Breath Hold Techniques
Authors: M Troeung, BS; P Fisher, CMD; X Shao, PhD, DABR; C Anderson, MD

Poster Summary: The MD Anderson Cancer Center Acute Cardiac Event Risk Calculator was used to evaluate the cardiac risk of breast cancer patients after receiving radiation therapy.

Volumetric-Modulated Arc Therapy as an Alternative to High Dose Rate Interstitial Brachytherapy: A Feasibility Study
Authors: E Makdasy Hana, MSc/Certificate; B Yi, PhD; S Chen, PhD; M Guerrero, PhD; K Jiang PhD

Poster Summary: Based on the results of the four patients, compared to the HDR interstitial plans, VMAT plans offer improved target coverage and similar dose inhomogeneity but increase the dose to the rectum. Therefore, VMAT may be a feasible alternative for GYN cancer patients unwilling or unqualified for HDR interstitial brachytherapy

Which is the best isocenter to choose in nasopharyngeal carcinomas' plan with Fixed Gantry IMRT?
Authors: A Essadok PhD; S Yahyaoui, MD; K Mahjoubi, MD; G Noubigh, MD; L Ben Salem, MD; Besbs, Pr; C Masr, MD

Poster Summary: Three possibilities of choosing of the isocenters in nasopharyngeal carcinoma's (UCNT) treatment plans in intensity modulated radiation therapy (IMRT) SW. The choice has a great impact in GTV,CTV and PTV coverage. For an eventual setup variation, this choice affects directly the dosimetric parameters for OAR and the Targets volumes.