Technical Note: Design and commissioning of a water phantom for proton dosimetry in magnetic fields.

Medical Physics
Hermann FuchsDietmar Georg

Abstract

To design and commission a water phantom suitable for constrained environments and magnetic fields for magnetic resonance (MR)-guided proton therapy. A phantom was designed, to enable precise, remote controlled detector positioning in water within the constrained environment of a magnet for MR-guided proton therapy. The phantom consists of a PMMA enclosure whose outer dimensions of 81 × 40 × 12.5 cm 3 were chosen to optimize space usage inside the 13.5-cm bore gap of the magnet. The moving mechanism is based on a low-height H-shaped non-ferromagnetic belt drive, driven by stepper motors located outside of the magnetic field. The control system and the associated electronics were designed in house, with similar features as available in commercial water phantoms. Reproducibility as well as accuracy of the phantom positioning were tested using a high-precision Leica AT 402 laser tracker. Laterally integrated depth dose curves and lateral beam profiles at three depths were acquired repeatedly for a 148.2 MeV proton beam in water. The phantom was successfully operated with and without applied magnetic fields. For complex movements, a positioning uncertainty within 0.16 mm was found with an absolute accuracy typically below 0.3 mm....Continue Reading

References

Sep 19, 2008·Physics in Medicine and Biology·B W RaaymakersJ J W Lagendijk
Aug 16, 2012·Physics in Medicine and Biology·Russell Wolf, Thomas Bortfeld
Jun 17, 2014·Seminars in Radiation Oncology·Sasa Mutic, James F Dempsey
Jun 17, 2014·Seminars in Radiation Oncology·Jan J W LagendijkMarco van Vulpen
Nov 4, 2016·Medical Physics·Hugo Palmans, Stanislav M Vatnitsky
Nov 23, 2018·Physics in Medicine and Biology·Sonja M SchellhammerJörg Pawelke
Dec 24, 2018·Physics in Medicine and Biology·A LührA L Hoffmann

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