Physics in Medicine & Biology
Jan 14, 2013
Physics and applications of positron beams in an integrated PET/MR
Charles C Watson, Lars Eriksson and Armin Kolb 2013 Phys. Med. Biol. 58 L1
A new hybrid medical imaging technology incorporates a positron emission tomograph (PET) within the uniform magnetic field of a 3-Tesla magnetic resonance imaging machine (MR). When a positron emitting radioactive source is suspended in such a PET/MR, the Lorentz force of the magnetic field causes the emitted positrons to form a well-defined beam across the PET's field of view. This novel separation of the positron production from the positron annihilation has significant advantages for PET source construction. The annihilation of these positron beams in air can form easily imaged 'phantom' objects that are free from the attenuation and scattering effects of conventional sources. Thin targets intersecting these beams can produce intense annihilation sources having the thickness of a sheet of paper, which are otherwise difficult to achieve. In this paper we discuss the physical characteristics of such positron beams in air and present examples of their applications.
About the author
Charles C Watson (Siemens Healthcare, Knoxville, TN, USA), Lars Eriksson (Siemens Healthcare, Knoxville, TN, USA, University of Tennessee, Knoxville, TN, USA, and University of Stockholm, Sweden) and Armin Kolb (Eberhard Karls University, Tübingen, Germany)