gms | German Medical Science

48th Meeting of the Particle Therapy Co-Operative Group

Particle Therapy Co-Operative Group (PTCOG)

28.09. - 03.10.2009, Heidelberg

Investigations on novel imaging techniques for ion beam therapy

Meeting Abstract

  • I. Rinaldi - Deutsches Krebsforschungszentrum, Heidelberg
  • S. Brons - Heidelberger Ionenstrahl-Therapie Centrum, Heidelberg
  • A. Ferrari - CERN, Geneva, Switzerland
  • O. Jäkel - Heidelberger Ionenstrahl-Therapie Centrum, Heidelberg
  • A. Mairani - Heidelberger Ionenstrahl-Therapie Centrum, Heidelberg
  • K. Parodi - Heidelberger Ionenstrahl-Therapie Centrum, Heidelberg

PTCOG 48. Meeting of the Particle Therapy Co-Operative Group. Heidelberg, 28.09.-03.10.2009. Düsseldorf: German Medical Science GMS Publishing House; 2009. Doc09ptcog164

doi: 10.3205/09ptcog164, urn:nbn:de:0183-09ptcog1641

Veröffentlicht: 24. September 2009

© 2009 Rinaldi et al.
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Purpose: Ion beams exhibit a finite range and an "inverted" depth-dose profile - the Bragg peak. These favourable physical properties enable superior tumour-dose conformality. However, they introduce sensitivity to range uncertainties. Although range uncertainties are typically taken into account in treatment planning, delivery of the intended treatment has to be assured to prevent underdosage of the tumour or overdosage of surrounding critical structures. Thus, dedicated Quality Assurance procedures are desirable to enable in-vivo range verification before or during ion therapeutic irradiation.

Material and methods: Monte Carlo (MC) calculations based on the FLUKA code [1], [2] and experimental investigations are being carried out to address the feasibility and to compare the performances of particle-based radiographic or tomographic transmission and emission imaging techniques. The aim is to identify complementary methods to Positron-Emission-Tomography (Enghardt W, et al. Nucl Instrum Meth. 2004;A 525:284-8.) for future application at HIT (Heidelberg Therapy Center). These novel imaging techniques could use 1) transmitted high energy primary particles (Ohno Y, et al. Nucl Instrum Meth. 2004;A 525:279-83.), [3] for low dose 2D and 3D imaging to evaluate the correct patient positioning and verify the ion range before treatment, or 2) emerging secondaries (Min CH, et al. Nucl Instrum Meth. 2007;A580:562., Testa E, et al. Appl Phys Lett. 2008;93:093506.), in particular protons, from the therapeutic beams to verify simultaneously and in-vivo the treatment delivery.

Results: First MC results and experimental data taken with simple radiographic films qualitatively support the feasibility of heavy ion computed tomography. In addition, it has been determined that the energy range availabe at the HIT accelerator would be sufficient for clinical application to head cases. For prostate and sacral cases, a reduction of the beam projections could be employed to avoid the pelvic bones. Further investigations are ongoing and the results will be presented.

Conclusion and outlook: Following the so far promising results, MC activities are in progress to identify and optimize a more suitable detector system for particle radiography and tomography, and to investigate the feasibility of imaging of prompt particle emission during ion irradiation.


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