NDLI: ESR dosimetry of human cortical bone irradiated by a therapeutic proton beam

Content Provider	IEEE Xplore Digital Library
Author	Sang-Yeob Lee Copeland, J.F. Chabot, G.E. Gall, K.P.
Copyright Year	2000
Description	Author affiliation: Dept. of Phys. & Appl. Phys., Massachusetts Univ., Lowell, MA, USA (Sang-Yeob Lee)
Abstract	Dosimetry based on the electron spin resonance (ESR) technique was used to study human cortical bone irradiated by a therapeutic proton beam. Bone samples were irradiated with 160-MeV protons and, for comparison, 6-MV photons, Additional samples were held aside as controls. The ESR peak-to-peak heights (PPH) for various doses were studied. A Bragg curve was generated by irradiating bone samples at various depths and measuring the ESR response. A companion Bragg curve was also generated via parallel plate ion chamber (PPIC) measurements. The proton-to-photon dose-response was 0.806/spl plusmn/0.034 (+1 s.d.) in the Bragg plateau. This ratio is lower than previously reported and is likely attributable to an intermediate-length (year,) decay component. In the Bragg curve analysis, an iterative technique for sub-millimeter sample depth-correction was employed. The Bragg peak position and height of the ESR data differed from the PPIC data. The ESR Bragg peak shift was -0.6 mm. The ratio of the ESR-to-PPIC Bragg peak height was 0.804/spl plusmn/0.029 (+1 s.d.), for a normalization in the Bragg plateau region. In conclusion, the difference in the peak position and the peak value of the Bragg curve may, in part, be from detector size effects, as noted in the very interesting work of Bichsel (1995). A direct comparison, however, can not be made because of differences in the two studies. The role of differential proton stopping-power effects in the bone response is discussed.
Starting Page	147
Ending Page	150
File Size	363388
Page Count	4
File Format	PDF
ISBN	0780364651
ISSN	1094687X
DOI	10.1109/IEMBS.2000.900690
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-07-23
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Paramagnetic resonance Dosimetry Humans Bones Particle beams Protons Spectroscopy Magnetic field measurement Electrons Radiation detectors
Content Type	Text
Resource Type	Article

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