Analysis of accuracy in dose and position in calculations of a treatment planning system for blocked photon fields

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
A A van't Veld

Abstract

Accuracy in dose and position, defined as complementary criteria, was determined for blocked photon field calculations with a pencil beam based treatment planning system. The concept of field accuracy has been defined as a combination of deviations in dose and position. Absolute dose deviations were measured including the deviations in beam output (monitor units), depth doses and dose profiles. Based on this verification work it was concluded that the pencil beam model is capable of calculating dose distributions in blocked photon fields (6 MV and 25 MV) with a high degree of accuracy. The measurements and calculations mostly agreed within 3% or 3 mm, whichever was less, relative to a reference dose at 10 cm depth. Furthermore, the model behaves consistently because a substantial part of the discrepancies found could be ascribed to fundamental assumptions in the model related to electron contamination and primary block transmission. The concept 'field accuracy' allows an easy, quantitative and comprehensive comparison to common quality requirements giving, for example, equal weight to percent dose difference and to millimetre isodose distance. The method offers the possibility to focus on calculation accuracy which excludes som...Continue Reading

Citations

Jul 15, 2005·Medical Physics·Anders AhnesjöErik Traneus
Oct 7, 2004·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Andrew NisbetDavid I Thwaites
Oct 26, 2000·Physics in Medicine and Biology·E Wieslander, T Knöös
Apr 18, 2002·Journal of Applied Clinical Medical Physics·Lars Weber, Per Nilsson
Dec 10, 1999·Physics in Medicine and Biology·A Ahnesjö, M M Aspradakis

❮ Previous
Next ❯

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.