title: Limited-angle 3D reconstruction of PET images for dose localization in light ion tumour therapy.
abstract: In vivo dose localization in light ion tumour therapy can be performed by measuring the range distributions of beta+ active ions in tissue employing positron emission tomographic techniques. For this purpose a multiplicative iteration scheme for reconstructing three-dimensional images from shift-variant, limited-angle data is presented. In the iterative correction steps the algorithm uses the geometric means of quotients calculated from the three-dimensional Radon transforms of the backprojected measured and approximated source distributions. When sources measured with poor statistics are reconstructed, an effective noise suppression is achieved.
authors.affiliation: ZfK Rossendorf, Institut für Subatomare Physik, Dresden, Federal Republic of Germany.
authors.forename: W
authors.initials: W
authors.lastname: Enghardt
authors.forename: W D
authors.initials: WD
authors.lastname: Fromm
authors.forename: P
authors.initials: P
authors.lastname: Manfrass
authors.forename: D
authors.initials: D
authors.lastname: Schardt
mesh_terms: D000465:Algorithms; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007477:Ions; D009369:Neoplasms / Q000532:radiotherapy*; D011879:Radiotherapy Dosage; D014055:Tomography, Emission-Computed
chemical_list: D007477:Ions