Manual multi-leaf collimator for electron beam shaping--a feasibility study. 2002

B Paul Ravindran, and I Rabi Raja Singh, and S Brindha, and S Sathyan
Department of Radiation Oncology, CMC Hospital, Vellore 632 004, India. paul@cmcvellore.ac.in

In electron beam therapy, lead or low melting point alloy (LMA) sheet cutouts of sufficient thickness are commonly used to shape the beam. In order to avoid making cutouts for each patient, an attempt has been made to develop a manual multi-leaf collimator for electron beams (eMLC). The eMLC has been developed using LMA for a 15 x 15 cm2 applicator. Electron beam characteristics such as depth dose, beam profiles, surface dose, output factors and virtual source position with the eMLC have been studied and compared with those of an applicator electron beam. The interleaf leakage radiation has also been measured with film dosimetry. Depth dose values obtained using the eMLC were found to be identical to those with the applicator for depths larger than Dmax. However, a decrease in the size of the beam penumbra with the eMLC and increase in the values of surface dose, output factors and virtual source position with eMLC were observed. The leakage between the leaves was less than 5% and the leakage between the opposing leaves was 15%, which could be minimized further by careful positioning of the leaves. It is observed that it is feasible to use such a manual eMLC for patients and eliminate the fabrication of cutouts for each patient.

UI MeSH Term Description Entries
D011786 Quality Control A system for verifying and maintaining a desired level of quality in a product or process by careful planning, use of proper equipment, continued inspection, and corrective action as required. (Random House Unabridged Dictionary, 2d ed) Control, Quality,Controls, Quality,Quality Controls
D011879 Radiotherapy Dosage The total amount of radiation absorbed by tissues as a result of radiotherapy. Dosage, Radiotherapy,Dosages, Radiotherapy,Radiotherapy Dosages
D011881 Radiotherapy, Computer-Assisted Computer systems or programs used in accurate computations for providing radiation dosage treatment to patients. Computer-Assisted Radiotherapy,Radiation Therapy, Computer-Assisted,Computer-Assisted Radiation Therapy,Computer Assisted Radiation Therapy,Computer Assisted Radiotherapy,Computer-Assisted Radiation Therapies,Computer-Assisted Radiotherapies,Radiation Therapies, Computer-Assisted,Radiation Therapy, Computer Assisted,Radiotherapies, Computer-Assisted,Radiotherapy, Computer Assisted,Therapies, Computer-Assisted Radiation,Therapy, Computer-Assisted Radiation
D004583 Electrons Stable elementary particles having the smallest known negative charge, present in all elements; also called negatrons. Positively charged electrons are called positrons. The numbers, energies and arrangement of electrons around atomic nuclei determine the chemical identities of elements. Beams of electrons are called CATHODE RAYS. Fast Electrons,Negatrons,Positrons,Electron,Electron, Fast,Electrons, Fast,Fast Electron,Negatron,Positron
D004867 Equipment Design Methods and patterns of fabricating machines and related hardware. Design, Equipment,Device Design,Medical Device Design,Design, Medical Device,Designs, Medical Device,Device Design, Medical,Device Designs, Medical,Medical Device Designs,Design, Device,Designs, Device,Designs, Equipment,Device Designs,Equipment Designs
D005240 Feasibility Studies Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project. Feasibility Study,Studies, Feasibility,Study, Feasibility
D005373 Film Dosimetry Use of a device (film badge) for measuring exposure of individuals to radiation. It is usually made of metal, plastic, or paper and loaded with one or more pieces of x-ray film. Film Badge Dosimetry,Film Badge,Badge Dosimetries, Film,Badge Dosimetry, Film,Badge, Film,Badges, Film,Dosimetries, Film,Dosimetries, Film Badge,Dosimetry, Film,Dosimetry, Film Badge,Film Badge Dosimetries,Film Badges,Film Dosimetries
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000497 Alloys A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions. Alloy
D012542 Scattering, Radiation The diversion of RADIATION (thermal, electromagnetic, or nuclear) from its original path as a result of interactions or collisions with atoms, molecules, or larger particles in the atmosphere or other media. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) Radiation Scattering,Radiation Scatterings,Scatterings, Radiation

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