Ranges of ions in metals for use in particle treatment planning

Physics in Medicine and Biology
Oliver Jäkel

Abstract

In proton and ion radiotherapy, the range of particles is calculated from x-ray computed tomography (CT) numbers. Due to the strong absorption of x-rays in a metal and a cut-off for large Hounsfield units (HU) in the software of most CT-scanners, a range calculation in metals cannot be based on the measured HU. This is of special importance when metal implants such as gold fillings or hip prostheses are close to the treatment volume. In order to overcome this problem in treatment planning for heavy charged particles, the correct ranges of ions in the metal relative to water have to be assigned in the CT data. Measurements and calculations of carbon ion ranges in various metals are presented that can be used in treatment planning to allow for a more accurate range calculation of carbon ion beams in titanium, steel, tungsten and gold. The suggested values for the relative water-equivalent range and their uncertainties are 3.13 (+/-3%) for titanium, 5.59 (+/-3%) for stainless steel and 10.25 (+/-4%) for gold.

References

Oct 1, 1979·International Journal of Radiation Oncology, Biology, Physics·G T ChenJ M Quivey
Jan 1, 1996·Physics in Medicine and Biology·U SchneiderA Lomax
Apr 28, 2001·Physics in Medicine and Biology·O JäkelJ Debus
May 8, 2001·Medical Physics·O JäkelG H Hartmann
May 14, 2003·Physics in Medicine and Biology·Nobuyuki KanematsuTatsuaki Kanai

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Citations

Jul 13, 2000·International Journal of Radiation Oncology, Biology, Physics·A LomaxR Miralbell
Feb 26, 2008·Medical Physics·Johanna Kempe, Anders Brahme
Jan 18, 2007·Physics in Medicine and Biology·Oliver Jäkel, Petra Reiss
Jun 25, 2009·Physics in Medicine and Biology·Harald Paganetti
Jul 22, 2011·Physics in Medicine and Biology·C Bert, M Durante

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