PMID: 9434977Jan 22, 1998Paper

A filtration method for improving film dosimetry in photon radiation therapy

Medical Physics
Inhwan Jason YeoS E Burch

Abstract

Successful radiotherapy requires accurate dosimetry for treatment verification. Existing dosimeters such as ion chambers, TLD, and diodes have drawbacks such as relatively long measurement time and poor spatial resolution. These disadvantages become serious problems for dynamic-wedged beams. Thus the clinical use of dynamic wedges requires an improved dosimetry method. X-ray film may serve this purpose. However, x-ray film is not clinically accepted as a dosimeter for photon beams, because it overresponds to photons with energies below about 400 keV. This paper presents and develops a method which was initially proposed by Burch to improve the dose response of x-ray film in a phantom. The method is based on placing high-atomic number foils next to the film. The foils are used as filters to preferentially remove low-energy photons. The optimal film and filter configuration in a phantom was determined using a mathematical scheme derived in this study and a Monte Carlo technique (ITS code). The optimal configuration thus determined is as follows: the filter-to-film distance of 6 mm and the filter thickness of 0.15 mm for percent depth-dose measurement; the distance of 1 cm and the thickness of 0.25 mm for off-axis (dose) ratio mea...Continue Reading

References

Jun 1, 1972·Radiology·A Jacobson
Feb 1, 1982·International Journal of Radiation Oncology, Biology, Physics·F R Hendrickson
May 12, 1950·Science·J S LAUGHLIN, W D DAVIES

❮ Previous
Next ❯

Citations

Aug 31, 2012·Radiology and Oncology·Slaven JurkovicAna Diklic
May 2, 2009·The Review of Scientific Instruments·Masatoshi HashimotoKeiichi Nakagawa
Feb 11, 2014·Medical Physics·Liyun ChangPang-Yu Chen
Jan 8, 2013·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Seyedali VaezzadehMehran Yarahmadi
Jul 28, 2007·Medical Physics·Sujatha PaiUNKNOWN American Association of Physics in Medicine
Sep 29, 1999·Medical Physics·M Geso, T Ackerly
Apr 4, 2002·Medical Physics·Sang Gyu JuInhwan Jason Yeo
Mar 17, 1999·Medical Physics·J R SykesP C Williams
Feb 6, 2004·Medical Physics·Marta BuccioliniMarta Casati
Nov 1, 2002·Medical Physics·Nathan L ChildressIsaac I Rosen
May 2, 2008·Journal of Applied Clinical Medical Physics·Mohamed MetwalyAbdel Sattar Mohamed Sallam
Aug 13, 2004·Medical Physics·Inhwan Jason YeoMohammad Islam
Jan 2, 2004·Physics in Medicine and Biology·Tsang CheungMartin J Butson
Aug 1, 2007·Physics in Medicine and Biology·Martina FussDietmar Georg
Apr 9, 2005·Physics in Medicine and Biology·S Gillis, C De Wagter
Jun 1, 2001·Physics in Medicine and Biology·N SuchowerskaP Metcalfe
Nov 16, 2002·Physics in Medicine and Biology·Tsang CheungPeter Metcalfe

❮ 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.