MO-A-213AB-10: Scattering System Optimization for Proton Therapy

Medical Physics
A WroeJ Slater

Abstract

To describe a method for optimization and production of a dual scattering system for proton beam delivery. Dual-foil passive scattering is currently the prevalent modality for proton therapy delivery. Large uniform proton fields are created using a 2-stage scattering system comprising an upstream uniform lead foil (stage 1) followed by a contoured lead/Lexan foil to provide beam and range uniformity (stage 2). Optimizing the parameters of these foils, including thickness, contour and placement, provides not only a flat and symmetrical radiation field with a uniform range, but also affects the overall efficiency of the beam line. An analytical method for optimizing the scattering system design was applied and validated with GEANT4 simulations. This method has been used to create passively scattered therapeutic and research proton fields at our proton therapy facility. A novel Cerrobend casting method is described that allows for cost-effective and accurate production of this important beam-line component. A number of dual scattering foil combinations for research and therapeutic purposes have been created and were evaluated with GEANT4 simulations. We demonstrated that the use of this system can generate passively scattered prot...Continue Reading

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.