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Results for "small field": 57 found

A Comparative Analysis of Hand Calculations and Macro Monte Carlo Simulations for Electron Beam Dosimetry

Authors: Mohamed Eldib, Adam Mahl, Moyed Miften, Rachel Petragallo, Kelly L. Stuhr

Affiliation: University of Colorado - Anschutz Medical Campus, University of Colorado School of Medicine, University of Colorado Denver, Department of Radiation Oncology, University of Colorado

Abstract Preview: Purpose: To compare electron beam dose calculations performed manually with those computed using the Macro Monte Carlo simulation for standard fields on both phantom and patient setups, with the aim o...

A Dosimetric Study of Small-Field Apertured Spot-Scanning Proton Stereotactic Radiosurgery for Pediatric Brain Tumors

Authors: Chin-Cheng Chen, Chia-Ho Hua, Christopher J. Kutyreff, Thomas E. Merchant

Affiliation: St. Jude Children's Research Hospital

Abstract Preview: Purpose: A dosimetric study was conducted to determine the optimal field parameters for a commercially available small-field applicator (SFA) used in spot-scanning proton stereotactic radiosurgery, pa...

A Study of Large Model Alignment Techniques for MRI Images of Small Sample Meningioma

Authors: Xiangli Cui, Man Hu, Wanli Huo, Da Yao, Jianguang Zhang, Yingying Zhang, Shanyang Zhao

Affiliation: Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, the Zhejiang-New Zealand Joint Vision-Based Intelligent Metrology Laboratory, College of Information Engineering, China Jiliang University, Departments of Radiation Oncology, Zibo Wanjie Cancer Hospital, Department of Oncology, Xiangya Hospital, Central South University, Department of Radiation Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences

Abstract Preview: Purpose:
To study the fine-tuning strategy of pre-trained AI image generation model to adapt to the generation of small sample meningioma MRI images, explore its impact on observer performance, and...

An International Multi-Institutional Espresso Study of Developing the Specialized-Equipment-Free Remote Audit for Single-Isocenter Multi-Target Stereotactic Radiosurgery

Authors: Juan-Francisco Calvo-Ortega, Andrew Cousins, Ashley Cullen, Andrew Dipulia, Peter B. Greer, Seng Boh Gary Lim, Shih-Chi Lin, D. Michael Lovelock, Conor McGarry, Victoria Robinson, Cameron Stanton, Baozhou Sun, Ching-Ling Teng, Gemma Warner, Benjamin J. Zwan

Affiliation: Northern Ireland Cancer Centre, Baylor College of Medicine, Department of Medical Physics, Memorial Sloan Kettering Cancer Center, Christchurch Hospital, Northwell, Central Coast Cancer Centre, Calvary Mater Hospital, Hospital Quironsalud Barcelona, Icahn School of Medicine at Mount Sinai, Chris O'Brien Lifehouse, University of Newcastle

Abstract Preview: Purpose: This multi-institution Electronic Silicon-based Remote Survey of Small-field Output (ESPRESSO) study aims to develop the remote audit process to evaluate the safety of single-isocenter multi-...

An Optimal-Mass-Transport-Based Mathematical Model Applied to Brain DCE-MRI to Differentiate Brain Metastases Recurrence from Radiation Necrosis

Authors: Aditya P. Apte, Xinan Chen, Joseph O. Deasy, Ramesh Paudyal, Kyung Peck, Amita Shukla-Dave, Nathaniel Swinburne, Robert J. Young

Affiliation: Department of Radiology, Memorial Sloan Kettering Cancer Center, Department of Medical Physics, Memorial Sloan Kettering Cancer Center

Abstract Preview: Purpose: We apply our novel formulation of unbalanced-regularized-optimal-mass-transport (urOMT) theory to brain DCE-MRI data to quantify and visualize the behaviors of fluid flows in post-treatment f...

Analyzer-Less X-Ray Interferometry with Super-Resolution Methods

Authors: Joyoni Dey, Hunter Cole Meyer, Murtuza Taqi

Affiliation: Louisiana State University

Abstract Preview: Purpose: We propose using super-resolution methods for X-ray grating interferometry without an analyzer with detectors that fail to meet the Nyquist sampling rate needed for traditional image recovery...

Application of a Flashdiamond Detector Coupled to a Beam Current Transformer to Commission a Monte Carlo Model of a Ultra-High Dose Rate Electron Beam

Authors: Javier Chiasson, Dominique Guillet, Arthur Lalonde, Karim Zerouali

Affiliation: Universite de Montreal, Centre Hospitalier de l'Universite de Montreal

Abstract Preview: Purpose:
To validate a Monte Carlo (MC) model of a Ultra-High dose rate (UHDR) electron beam using a prototype flashdiamond (fD) detector coupled to an electrostatically shielded beam current trans...

Assessment of Vasculature Mapping Using Infrared Imaging System for Treatment Planning

Authors: Lily Jo Bertemes, Careesa Billante, Ashley Cetnar, Maximilian Stephen Meineke, Runhe Tan

Affiliation: The James Cancer Center, The Ohio State University, The Ohio State University - James Cancer Hospital

Abstract Preview: Purpose: The response of healthy vasculature due to radiation treatments is an underexplored area of radiation oncology. Understanding the impact of radiation on veins could advance treatment optimiza...

Characterization and Validation of Cerenkov Radiation Extraction Methods from a Plastic Scintillation Detector in 0.35T MR-Linac Environments

Authors: Mateb Ali Alghamwa, Haya Aljuaid, Siyong Kim, Tianjun Ma, William Song

Affiliation: Virginia Commonwealth University

Abstract Preview: Purpose: The integration of Plastic Scintillation Detectors (PSDs) into 0.35T MR-Linac systems represents a significant advancement in radiotherapy, offering substantial benefits due to their tissue-e...

Characterization of Commercially-Available Dosimeters and Prototype Diamond Detectors for Absolute Flash Dosimetry of Small-Field Pulsed Proton Beams

Authors: Ronald C Chen, Hao Gao, Nicolas Gerard, Harold Li, Yuting Lin, Jarrick Nys, Jufri Setianegara, Mark Szczepanski, Aoxiang Wang

Affiliation: 4Physikalisch-Technische Werkstätten (PTW), Department of Biomedical Engineering, Huazhong University of Science and Technology, Ion Beam Applications (IBA), Department of Radiation Oncology, University of Kansas Medical Center

Abstract Preview: Purpose: Modern synchrocyclotrons can produce magnetically-scanned protons at ultra-high dose-rates (FLASH). However, their pulsed nature leads to high doses-per-pulse (DPP) which can cause non-neglig...

Cherenkov to Dose Trends with Small Field Beams

Authors: Jeremy Eric Hallett, Aubrey Parks, Brian W Pogue

Affiliation: University of Wisconsin - Madison, University of Wisconsin-Madison

Abstract Preview: Purpose: Cherenkov imaging visualizes radiotherapy beams, assuming emission is proportional to deposited dose. However, attempts for Cherenkov as a quantitative dose estimation have been unsuccessful ...

Comparison of Mlc Off-Axis Characteristics for Eclipse AAA v18 and v16 Using Portal Dosimetry

Authors: Junsheng Cao, Khushdeep Singh

Affiliation: Overlook Medical Center

Abstract Preview: Purpose: Eclipse v18 introduces Enhanced Leaf Modeling for MLCs. This study investigates the MLC off-axis characteristics using portal dosimetry
Methods:
MLC characteristics were analyzed for th...

Conformal Flash for Large Treatment Fields

Authors: Julien Forthomme, Carolina Llina Fuentes, Valentin Hamaide, Lucian Hotoiu, Rudi Labarbe, Rasmus Nilsson, Arnaud Pin, Francois Vander Stappen, Erik Traneus

Affiliation: RaySearch Laboratories AB, Ion Beam Applications SA

Abstract Preview: Purpose: Conformal FLASH achieves ultra-high-dose-rate (UHDR) proton therapy (>40 Gy/sec) by scanning a mono-energetic pencil beam through accessories (range shifter, Conformal Energy Modulator, apert...

Deep Learning Based Filter with Back-Projection Operator for CT Reconstruction

Authors: Justus Adamson, Mu Chen, Ke Lu, Zhenyu Yang, Fang-Fang Yin, Rihui Zhang, Yaogong Zhang, Haipeng Zhao, Haiming Zhu, Yuchun Zhu

Affiliation: Shanghai Dacheng Medical Technology, Duke University, Medical Physics Graduate Program, Duke Kunshan University, Duke Kunshan University, The First People's Hospital of Kunshan

Abstract Preview: Purpose: In filtered back-projection (FBP) reconstruction, conventional filters often reduce noise at the expense of high-frequency details, leading to structural details loss. To address this limitat...

Design of Filtimator (Filter + Collimator) for CBCT of Pediatric Cancer Patients Receiving Proton Therapy

Authors: Soon N. Huh, Perry B. Johnson, Jiyeon Park, Ryan Stevens

Affiliation: University of Florida Health Proton Therapy Institute, UF Health Proton Therapy Institute, UFHPTI

Abstract Preview: Purpose:
Cone-beam computed tomography (CBCT) doses shall be limited for pediatric patients in clinical settings. Device called Filtimator (filter+collimator) was custom designed to reduce setup CB...

Design of a Small Animal Proton Flash Irradiation System with High Achievable Dose and Dose Rate Using a Synchrotron Proton Beamline

Authors: Zongsheng Hu, Yuting Li, Radhe Mohan, Emil Schueler, Uwe Titt

Affiliation: The University of Texas MD Anderson Cancer Center, Department of Radiation Physics, The University of Texas MD Anderson Cancer Center

Abstract Preview: Purpose: In previous work, we developed an irradiation system for pre-clinical ultra-high-dose-rate(FLASH) radiotherapy experiments based on synchrotron proton beamline. However, the beam current limi...

Development and Validation of Patient-Specific 3D-Printed Electron Applicators for Precision Radiotherapy

Authors: Md. Jobairul Islam

Affiliation: Department of Radiation Oncology, Labaid Cancer Hospital and Super Speciality Centre

Abstract Preview: Purpose: Electron radiotherapy is an effective treatment for superficial tumors but requires field-shaping devices like electron applicators, which are labor-intensive to produce. This study aimed to ...

Development of Cross-Platform Application for Radiation Contamination Assessment

Authors: Wesley E. Bolch, Lotem Buchbinder Shadur, Natalia Estefania Carrasco-Rojas, Chansoo Choi, Robert Joseph Dawson, Shaheen Dewji, John Francis, Emmanual Mate-Kole, Wyatt Smither, Yitian Wang

Affiliation: Georgia Tech, University of Florida, Nuclear and Radiological Engineering and Medical Physics Programs, Georgia Institute of Technology

Abstract Preview: Purpose: Develop a software application capable of assessing the radiation contamination of military service members and members of the general public for fast, on-site radiological triage. The softwa...

Development of an MRI Guided Precision Small Animal Radiotherapy System

Authors: Yaowen Cao, Yunwen Huang, Yidong Yang, Xiaogang Yuan, Ning Zhao, Cheng Zheng

Affiliation: Department of Life Sciences and Medicine, University of Science and Technology of China, Department of Engineering and Applied Physics, University of Science and Technology of China, University of Science and Technology of China

Abstract Preview: Purpose: MRI has better soft tissue contrast than cone beam CT which is commonly used in image guided radiotherapy. This study aims to develop a low-field MRI system for precision small animal radiati...

Directional Dependence of Detectors for Beam Profiles and Output Factors in Small Field Dosimetry

Authors: Indra J. Das, Ahtesham Ullah Khan, Andrew J. White

Affiliation: Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin - Madison, Northwestern Memorial Hospital, Northwestern University Feinberg School of Medicine

Abstract Preview: Purpose: Small field dosimetry presents challenges due to lateral disequilibrium and the selection of suitable detectors. Volume averaging and density corrections hamper accurate profile measurements....

Dosimetric Changes of Magnetic Control System to Improve Anatomy in Abdominal SBRT

Authors: Justus Adamson, Wesley Andrew Cunningham, Chang-Sei Kim, Yeongoh Ko, Anna E. Rodrigues

Affiliation: Duke University, Chonnam National University, Duke University Medical Center

Abstract Preview: Purpose: Radiation induced toxicities in bowel remains a challenge for SBRT. Due to sharp dose falloffs, small displacements of the bowel can lead to meaningful dose reduction. Remote magnetic navigat...

Dosimetric Characterization of Spatial Fractionation Collimator for Ultra-High Dose Rate Electron Beam

Authors: Lily Jo Bertemes, Careesa Billante, Ashley Cetnar, Arnab Chakravarti, Nilendu Gupta, Sagarika Jain, Maximilian Stephen Meineke, Allison N. Palmiero, Runhe Tan

Affiliation: The Ohio State University - James Cancer Hospital, Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Department of Radiation Oncology, Ohio State University Comprehensive Cancer Center, The Ohio State University, The James Cancer Center

Abstract Preview: Purpose: Ultra-High Dose Rate Radiation Therapy (UHDR-RT) induces normal tissue sparing while maintaining iso-effective tumor control compared to conventional methods, known as the “FLASH effect”. How...

Dosimetric Evaluation of Enhanced Dynamic Leaf Gap Modeling in Small-Field Clinical Plans: A Verification Study

Authors: Ian J. Butterwick, Sumudu Katugampola, ChangSeon Kim, Evan G. Meekins, Zhengdong Zhang

Affiliation: Mount Sinai Beth Israel, Gesinger Medical Center, Geisinger Medical Center

Abstract Preview: Purpose: To evaluate the dosimetric impact of enhanced dynamic leaf gap (EDLG) modeling in Eclipse V18.0 on small-field dosimetry within VMAT plans.
Methods: Plans with small fields (1 cm x 1 cm to...

Dosimetric Uncertainties Associated with Photon Small Field Dosimetry

Authors: Kazi Towmim Afrin, Imad M. Ali, Jordan West

Affiliation: University of Oklahoma Health Sciences Center, University of Oklahoma

Abstract Preview: Purpose: To evaluate quantitatively the dosimetric uncertainties associated with dose calculation and measurement of small photon fields used in stereotactic photon therapy.
Methods: The output fac...

Dynamic Winston-Lutz Testing for FFF Beams

Authors: Cambridge L Bui-Nguyen, Alexander S. Nguyen, Liqiang (Lee) Tao

Affiliation: Varian AOS @Epic Care, UC Berkeley

Abstract Preview: Purpose: Dynamic Winston-Lutz (WL) testing provides a comprehensive framework for evaluating the accuracy of isocenter alignment. This study investigates the impact of dynamic beam modulation, such as...

EBT4 Film Dosimetry and the Significance of the ¼ Fwhm Rule for Gamma Knife Output Factors

Authors: Jingying Lin, Stevan Pecic, Strahinja Stojadinovic

Affiliation: University of Belgrade, The University of Texas Southwestern Medical Center

Abstract Preview: Purpose: This study aims to determine the magnitude of polarization-induced dosimetric error for EBT4 films at different scanning orientations, and to provide guidance on selecting appropriate regions...

Effects of Enhanced Leaf Modeling on Single-Isocenter Multi-Target Stereotactic Radiosurgery Dose Accuracy

Authors: Thomas R. Mazur, Kevin Renick, Matthew C. Schmidt, Xiaodong Neo Zhao

Affiliation: Washington University in St. Louis School of Medicine, Washington University School of Medicine

Abstract Preview: Purpose: To compare dose calculation accuracy for single-isocenter multi-target stereotactic radiosurgery plans (SIMT-SRS) in Eclipse V18.0 with enhanced leaf model (ELM) using the anisotropic analyti...

Evaluating Pulse Normalization for Enhanced Ion Chamber Signal Correction in Relative Dosimetry during Beam Scanning

Authors: Alejandro Cuadra, Paulina E. Galavis, Juan Leal, Enrique Lozano, Franklin Reggio, Gabriel Zelada

Affiliation: Clínica Iram, Clinica Alemana, Hospital Clínico de Magallanes, E&G Medical Systems Ltda, NYU Langone Health

Abstract Preview: Purpose: To investigate and compare the new method “Pulse Normalization” proposed by Sun Nuclear to correct ion chamber signal for fluctuations in the accelerator output while performing relative dosi...

Evaluating the Impact of Beam Spot Spacing on Dose Rates and Field Uniformity for Small Animal Proton Ultra-High Dose Rate Irradiation

Authors: Jack Biondo, Audrey Magness, Anthony E. Mascia, Zhiyan Xiao, Yongbin Zhang

Affiliation: Cincinnati Children's Proton Therapy Center

Abstract Preview: Purpose: Proton FLASH-RT has shown promise reducing normal tissue toxicity while maintaining tumor control. However, in vivo experiments critically depend on achieving ultra-high dose rate (UHDR) and ...

Evaluation of Daily Respiratory Pattern from a Single Free-Breathing Cone Beam CT Scan

Authors: Weixing Cai, Laura I. Cervino, Yabo Fu, Xiuxiu He, Tianfang Li, Xiang Li, Hao Zhang

Affiliation: Department of Medical Physics, Memorial Sloan Kettering Cancer Center

Abstract Preview: Purpose:
This work aims to develop an innovative technique to evaluate patients’ daily respiratory pattern using three-dimensional (3D) deformation vector fields (DVF) derived from a free-breathing...

Evaluation of the Extrapolated Output Factors of Varian's Halycon Beam Model for Fields Smaller Than 1 Cm with AAA and Acurosxb

Authors: Arjit K. Baghwala, Devin J. Olek, Parth K. Patel, Ramiro Pino, Adam Yanez

Affiliation: Houston Methodist Hospital, Kaiser Permanente

Abstract Preview: Purpose: The Halcyon beam model in Eclipse is immutable and only includes output factors (OF) for fields down to 1x1 cm2. The TPS must extrapolate OFs for smaller fields used in stereotactic (SRS/SBRT...

Evaluation of the Latest Plastic Scintillating Detector System with Probe Sizes of 0.5 × 0.5 mm2 and 1.0 × 1.0 mm2 for Small Field Dosimetry

Authors: Milad BaradaranGhahfarokhi, Ashley Elizabeth Bonner, James R. Burns, Annie Cooney, George X. Ding, Kenneth L. Homann, Guozhen Luo

Affiliation: Corewell Health William Beaumont University Hospital, Vanderbilt University Medical Center

Abstract Preview: Purpose: The goal of this study was to evaluate the performance of a new plastic scintillating detector (PSD) system with 0.5×0.5 mm2 and 1.0×1.0 mm2 probes (referred to as Medscint0.5 and Medscint1.0...

FMEA for Optimizing Patient-Specific QA Program in IMRT: Insights from Diverse Practices

Authors: Bing-Hao Chiang, Eric C. Ford, Juergen Meyer, Timothy D. Solberg

Affiliation: Department of Radiation Oncology, Fred Hutchinson Cancer Center, University of Washington

Abstract Preview: Purpose: This study evaluated the potential risk reduction of various pretreatment patient-specific quality assurance (PSQA) programs for Intensity Modulated Radiation Therapy (IMRT) in mitigating fai...

Field Output Correction Factors of Novel Shielded and Unshielded Silicon Diode Detectors

Authors: Mohamad Ahmad Alissa, Carson Brame, Damian Czarnecki, Olivier Evrard, Charbel A. Habib, Jeff Hildreth, Andy Murray, Andreas Schönfeld, Ann-Britt Schönfeld, David Towle, Gerd Wessing

Affiliation: CDT-West - Centrum für Diagnostik und Therapie, Radiologie Vechta, Technische Hochschule Mittelhessen, MyMichigan Health, Sun Nuclear Corp., Mirion Technologies

Abstract Preview: Purpose: To characterize field output correction factors of novel shielded and unshielded silicon diode detectors.
Methods: Novel shielded and unshielded Silicon Diode Detectors (SDD) were characte...

First in-Vivo Application of a Novel Precision Small Animal Irradiation Platform with Proton IMPT Delivery and Advanced on-Board Image-Guidance

Authors: Niels Bassler, Jonathan Bortfeldt, Davide Boscaini, Francesco Evangelista, Guyue Hu, Ze Huang, Margarita Kozak, Julie Lascaud, Giulio Lovatti, Eero Lönnqvist, Jasper Nijkamp, Munetaka Nitta, Prasannakumar Palaniappan, Katia Parodi, Marco Pinto, Per R. Poulsen, Marco Riboldi, Babak Sharifi, Brita Singers Sørensen, Peter Thirolf

Affiliation: Department of Medical Physics, Ludwig-Maximilians-Universität München (LMU Munich), Ludwig-Maximilians Universität, Danish Centre for Particle Therapy, Aarhus University Hospital, Department of Medical Physics, Ludwig-Maximilians-Universität (LMU) München, Department of Experimental Clinical Oncology, Aarhus University, Department of Oncology, Aarhus University Hospital

Abstract Preview: Purpose: To perform the first in vivo application of a novel small animal radiation research platform combining on-board image-guidance with multi-field intensity modulated spot scanning delivery [1] ...

Getting in Focus: Review of Current Focal Spot Size Testing Methods with Flat Panel Digital Radiography Detectors

Authors: Matthew R. Hoerner, Maryam Naseri, Mena Shenouda

Affiliation: Yale University School of Medicine, Yale University

Abstract Preview: Purpose:
Historically film has been the gold standard receptor for measurements of x-ray tube focal spot size. Flat Panel Digital Radiography Detectors (FPDRDs) have lower spatial resolution compar...

Impact of Jaw Reproducibility and Source Occlusion on Small Field Dosimetry

Authors: Mylinh Dang, Indra J. Das, George X. Ding, Ahtesham Ullah U Khan, Andrew J. White

Affiliation: Northwestern Memorial Hospital, Northwestern University Feinberg School of Medicine, Northwestern Medicine, Vanderbilt University Medical Center

Abstract Preview: Purpose: The large variability in field output factor (FOF) observed among various studies is speculated to be due to uncertainty in jaw reproducibility that is linked directly with source occlusion. ...

Improving Stroke Treatment Using Magnetic Nanoparticle Sensors to Monitor Mechanical Thrombectomy

Authors: Clifford Eskey, Scott Gordon-Wylie, Scott Gordon-Wylie, Dhrubo Jyoti, Daniel Reeves, John B. Weaver

Affiliation: Flow Aluminum, Dartmouth College, Fred Hutch Cancer Center, University of Washington, Dartmouth-Health

Abstract Preview: Purpose: Mechanical thrombectomy (MT) is the preferred treatment for ischemic stroke from large vessel occlusion. The thrombus or clot is extracted from the vessel via a catheter using a stent retriev...

Low-Field MRI: Big Impact from Small Signals

Authors: Joshua P. Kim

Affiliation: Henry Ford Health

Abstract Preview: N/A...

Modeling of Novel Converging Beam Radiotherapy System in Geant4 Montel Carlo Simulation

Authors: Dirk A Bartkoski, Leonard Che Fru, Benjamin Abraham Insley, Michael Kleckner, Dongyeon Lee, Reza Reiazi, Mohammad Reza Salehpour, Aviad Schori, Ramesh C. Tailor

Affiliation: Empyrean Medical Systems, The University of Texas MD Anderson Cancer Center, Convergent-RnR, The University of Texas, MD Anderson, Houston TX

Abstract Preview: Purpose: A Geant4-based model was created for a G4BraggReflection process to simulate radiation transport within a novel radiotherapy system developed by Convergent Radiotherapy and Radiosurgery (CRnR...

Monte Carlo Derived Correction Factors for Ion Chambers Used in the Calibration of Gamma Knife Perfexion Model: Impact of Phantom Materials and Chamber Orientation on Dosimetric Accuracy

Authors: Catherine Coolens, Robert K. Heaton, Lalageh Mirzakhanian, Tasnim Rahman, Jan P. Seuntjens

Affiliation: Princess Margaret Cancer Centre & University of Toronto, McGill University, Princess Margaret Cancer Centre, Princess Margaret Hospital, University of Toronto

Abstract Preview: Purpose: Commissioning of a Gamma Knife® (GK) (Elekta, Sweden) unit requires precise dosimetric reference measurements, particularly for small fields. The IAEA TRS-483/AAPM TG-155 code of practice (20...

Organ Dose Estimation from Successive CBCT Imaging for Patients Undergoing Radiation Therapy for Prostate Cancer

Authors: Panagiotis Iliopoulos, Marios Myronakis, Kyriaki Theodorou

Affiliation: Medical Physics Department, Medical School, University of Thessaly

Abstract Preview: Purpose: To estimate individualized absorbed dose at Organs at Risk (OARs) from kV Cone Beam CT (CBCT) imaging in the pelvic area, prior radiotherapy, and assess excess risk for secondary malignancies...

Quantification of Chemical Species Yield and Radiation Damage Patterns for Radiopharmaceutical Therapy Isotopes: Lu-177, Y-90 and I-131

Authors: Zakaria Aboulbanine, Greeshma A. Agasthya, Paul Inman, Anuj J. Kapadia, Anthony Hong Cheol Lim, Jayasai Ram Rajagopal

Affiliation: Oak Ridge National Laboratory, Georgia Institute of Technology

Abstract Preview: Purpose: The fundamental concept of radiopharmaceutical therapy involves binding radioisotopes to molecules with a known biokinetic distribution, which ensures that the targeted organs receive higher ...

Quantitative Evaluation of Eclipse’s (V18) Ability to Address Dosimetric Leaf Gap Variations

Authors: D. Michael Lovelock, Charlotte Elizabeth Read, Ren-Dih Sheu, Jing Wang, Tingyu Wang

Affiliation: Icahn School of Medicine at Mount Sinai, Jersey Shore University Medical Center

Abstract Preview: Purpose:
Early Eclipse models use rectangular fluence profiles (widened by the dosimetric leaf gap (DLG) to account for the fact that leaf tips are rounded). Eclipse Version 18 (V18) uses enhanced ...

Radial Waveguide Structures for Enhanced Power Transmission Efficiency in Dielectric Wall Accelerators

Authors: Julien Bancheri, Chau Giang Bui, David G Cooke, Christopher M Lund, Morgan J Maher, Jan P. Seuntjens, Jason Z Yuan

Affiliation: Princess Margaret Cancer Centre & University of Toronto, Medical Biophysics, University of Toronto, University of Toronto, Medical Physics Unit, McGill University, Department of Physics, McGill University

Abstract Preview: Purpose: The dielectric wall accelerator (DWA) offers a low-cost solution for proton therapy, using non-resonant waveguides to accelerate particles. Radial waveguides (RWGs), consisting of a dielectri...

Robustness of Jacobian-Based and HU Change-Based CT Ventilation Imaging to Respiratory Amplitude Variations: A Study Using a Custom Phantom with Respiratory Amplitude Control

Authors: Tatsuya Fujisaki, Hiraku Fuse, Shin Miyakawa, Hiroki Nosaka, Masato Takahashi, Kenji Yasue

Affiliation: Ibaraki Prefectural University of Health Sciences

Abstract Preview: Purpose: This study aimed to evaluate the robustness of Jacobian-based and HUchange-based CT ventilation imaging (CTVI) against respiratory amplitude variations using a custom-designed alveolar phanto...

Simulation Design of a Dedicated Head Coil for Enhanced EPT Imaging to Map the Electrical Properties of Tumor Tissues

Authors: Jingyao Chen, Yingli Yang, Jie Zhang

Affiliation: Department of Radiology, Ruijin Hospital, Shanghai Ruijin Hospital, Shanghai United imaging Healthcare Advanced Technology Research Institute

Abstract Preview: Purpose: Magnetic Resonance Electrical Properties Tomography (MR EPT) is a method to spatially mapping the conductivity and permittivity based on small B1 field changes after the imaged object was int...

Small Fields Output Factor Measurements in 1.5 MR-Linac

Authors: Thomas I. Banks, Tsuicheng D. Chiu, Viktor M. Iakovenko, Christopher Kabat, Chang-Shiun Lin, Mu-Han Lin, Arnold Pompos

Affiliation: Department of Radiation Oncology, UT Southwestern Medical Center, UT Southwestern Medical Center, Medical Artificial Intelligence and Automation (MAIA) Lab & Department of Radiation Oncology, UT Southwestern Medical Center, Department of Radiation Oncology, UT Southwestern Medical Center, Dallas, TX

Abstract Preview: Purpose: The superior soft-tissue contrast provided by MR imaging offers favorable conditions for the effective application of stereotactic body radiation therapy (SBRT). Accurate small field dosimetr...

Streamlined Stereotactic Radiosurgery (SRS) Commissioning Experience with a 6FFF Beam for an Elekta Versa: A Clinical Overview for Increased Precision.

Authors: Asma Amjad, Slade J. Klawikowski, Natalya V. Morrow, Haidy G. Nasief, Eric S. Paulson, An Tai, Hualiang Zhong

Affiliation: Department of Radiation Oncology, Medical College of Wisconsin

Abstract Preview: Purpose: Accurate and precise linac-based SRS commissioning can be very challenging. Thus, it is important to increase the confidence in the measurement at each step prior to end-to-end testing. The p...

Streamlining Orthovoltage QA: Feasibility of IC Profiler Dosimetry and Workflow Optimization

Authors: Huixiao Chen, Zhe (Jay) Chen, MinYoung Lee, Sameer Taneja

Affiliation: Yale School of Medicine, Department of Therapeutic Radiology, Yale University School of Medicine

Abstract Preview: Purpose: Superficial radiation therapy uses low-energy x-rays to treat various types of cancers, including non-melanoma skin cancers, and dermatological conditions such as keloid scars, mycosis fungoi...

The Use of a Milled NIST Traceable Tld for End-to-End Validation in Mlc and Cone SRS Programs.

Authors: Ross Bland, Zachary A. Christ, Sophy Mangana, Feba Mathew, Stephanie K. Phoenix, Joseph Salloum, Jason D. Stanford, William Zollinger

Affiliation: Forrest General Cancer Center, Northeast Louisiana Cancer Institute, Florida Atlantic University

Abstract Preview: Purpose: The objective of this paper is twofold: 1) to explore the efficacy of using referenced beam models supplied by the vendor (Brainlab) and 2) the efficacy of NIST traceable TLD for end-to-end v...

Tumor Control Probability Estimation of Magnetic Hyperthermia and Radiation Combined Therapy in Prostate Cancer

Authors: John T Barrett, Dan Heo, Chulhaeng Huh, Farshad Mostafaei

Affiliation: Department of Radiation Oncology, Medical College of Georgia, Augusta University, Department of Radiation Oncology, Augusta University

Abstract Preview: Purpose: This study aimed to compare the tumor control probability (TCP) of radiation therapy (RT) and magnetic hyperthermia combined with RT (MHRT) in the human prostate cancer cells based on radiobi...

Ultra-Fast Commissioning and Quality Assurance with Plastic Scintillation Detector

Authors: Saad Bin Saeed Ahmed, Marcos Feijoo, Wazir Muhammad, Charles Shang, Naseem Ud Din

Affiliation: South Florida Proton Therapy Institute, Miami Cancer Institute, Blue Physics LLC, Florida Atlantic University

Abstract Preview: Purpose: Accurate, efficient, and reliable commissioning of linear accelerator (LINAC) is critical for ensuring high-quality radiation therapy treatments. The study uses advanced detector technology a...

Using Higher Order Harmonics to Reduce Artifacts in Grating Interferometry

Authors: Les Butler, Joyoni Dey, Conner B Dooley, Victoria L Fontenot, Kyungmin Ham, Hunter Cole Meyer

Affiliation: Louisiana State University, Center for Advanced Microstructures and Devices, Linfield University

Abstract Preview: Purpose: X-ray interferometry is an emerging imaging modality with a wide variety of potential clinical applications, including lung and breast imaging. Small inaccuracies in grating position lead to ...

Using Multi-Peak Reconstructions for Dosimetry of Fast and Quantitative Lutetium-177 SPECT/CT

Authors: Julia Brosch-Lenz, Munir Ghesani, Francesc Massanes, Michael Morris, Babak Saboury, Eliot Siegel, Alexander Hans Vija

Affiliation: Institute of Nuclear Medicine, Siemens Medical Solutions USA Inc., Molecular Imaging

Abstract Preview: Purpose: Quantitative imaging of the radiopharmaceutical distribution is crucial for treatment evaluation and dosimetry. However, as patient numbers for Lutetium-177-(177Lu)-labelled therapies continu...

Validation of SRS Mapcheck for Patient-Specific Quality Assurance of Cyberknife

Authors: Dong Wook Kim, Hojae Kim, Hojin Kim, Jin Sung Kim, Tae Ho Kim, Sangmin Lee

Affiliation: Department of Radiation Oncology, Yonsei Cancer Center, Heavy Ion Therapy Research Institute, Yonsei University College of Medicine

Abstract Preview: Purpose: The CyberKnife system, designed for stereotactic radiosurgery (SRS) and stereotactic body radiotherapy (SBRT), considers SRS MapCHECK an effective tool for patient-specific QA (PSQA). This wo...

Variations in Radiation Isocenter Offsets from the Winston-Lutz Test Performed on Different Photon Energies

Authors: Cambridge L Bui-Nguyen, Alexander S. Nguyen, Liqiang (Lee) Tao

Affiliation: Varian AOS @Epic Care, UC Berkeley

Abstract Preview: Purpose: To quantity variations in Winston Lutz (WL) test results due to different energies used in SBRT, SRT or SRS.
Methods: A WL phantom with a 6.4 mm diameter center radio-opaque sphere is used...