A 3D point-kernel multiple scatter model for parallel-beam SPECT based on a gamma-ray buildup factor
Апстракт
A three-dimensional (3D) point-kernel multiple scatter model for point spread function (PSF) determination in parallel-beam single-photon emission computed tomography ( SPECT), based on a dose gamma-ray buildup factor, is proposed. This model embraces nonuniform attenuation in a voxelized object of imaging ( patient body) and multiple scattering that is treated as in the point-kernel integration gamma-ray shielding problems. First-order Compton scattering is done by means of the Klein-Nishina formula, but the multiple scattering is accounted for by making use of a dose buildup factor. An asset of the present model is the possibility of generating a complete two-dimensional (2D) PSF that can be used for 3D SPECT reconstruction by means of iterative algorithms. The proposed model is convenient in those situations where more exact techniques are not economical. For the proposed models testing purpose calculations ( for the point source in a nonuniform scattering object for parallel beam c...ollimator geometry), the multiple-order scatter PSF generated by means of the proposed model matched well with those using Monte Carlo ( MC) simulations. Discrepancies are observed only at the exponential tails mostly due to the high statistic uncertainty of MC simulations in this area, but not because of the inappropriateness of the model.
Извор:
Physics in Medicine and Biology, 2007, 52, 19, 5785-5802
DOI: 10.1088/0031-9155/52/19/004
ISSN: 0031-9155
PubMed: 17881800
WoS: 000250443200004
Scopus: 2-s2.0-34748858614
Колекције
Институција/група
VinčaTY - JOUR AU - Marinković, Predrag AU - Ilic, Radovan AU - Spaic, Rajko PY - 2007 UR - https://vinar.vin.bg.ac.rs/handle/123456789/3310 AB - A three-dimensional (3D) point-kernel multiple scatter model for point spread function (PSF) determination in parallel-beam single-photon emission computed tomography ( SPECT), based on a dose gamma-ray buildup factor, is proposed. This model embraces nonuniform attenuation in a voxelized object of imaging ( patient body) and multiple scattering that is treated as in the point-kernel integration gamma-ray shielding problems. First-order Compton scattering is done by means of the Klein-Nishina formula, but the multiple scattering is accounted for by making use of a dose buildup factor. An asset of the present model is the possibility of generating a complete two-dimensional (2D) PSF that can be used for 3D SPECT reconstruction by means of iterative algorithms. The proposed model is convenient in those situations where more exact techniques are not economical. For the proposed models testing purpose calculations ( for the point source in a nonuniform scattering object for parallel beam collimator geometry), the multiple-order scatter PSF generated by means of the proposed model matched well with those using Monte Carlo ( MC) simulations. Discrepancies are observed only at the exponential tails mostly due to the high statistic uncertainty of MC simulations in this area, but not because of the inappropriateness of the model. T2 - Physics in Medicine and Biology T1 - A 3D point-kernel multiple scatter model for parallel-beam SPECT based on a gamma-ray buildup factor VL - 52 IS - 19 SP - 5785 EP - 5802 DO - 10.1088/0031-9155/52/19/004 ER -
@article{ author = "Marinković, Predrag and Ilic, Radovan and Spaic, Rajko", year = "2007", abstract = "A three-dimensional (3D) point-kernel multiple scatter model for point spread function (PSF) determination in parallel-beam single-photon emission computed tomography ( SPECT), based on a dose gamma-ray buildup factor, is proposed. This model embraces nonuniform attenuation in a voxelized object of imaging ( patient body) and multiple scattering that is treated as in the point-kernel integration gamma-ray shielding problems. First-order Compton scattering is done by means of the Klein-Nishina formula, but the multiple scattering is accounted for by making use of a dose buildup factor. An asset of the present model is the possibility of generating a complete two-dimensional (2D) PSF that can be used for 3D SPECT reconstruction by means of iterative algorithms. The proposed model is convenient in those situations where more exact techniques are not economical. For the proposed models testing purpose calculations ( for the point source in a nonuniform scattering object for parallel beam collimator geometry), the multiple-order scatter PSF generated by means of the proposed model matched well with those using Monte Carlo ( MC) simulations. Discrepancies are observed only at the exponential tails mostly due to the high statistic uncertainty of MC simulations in this area, but not because of the inappropriateness of the model.", journal = "Physics in Medicine and Biology", title = "A 3D point-kernel multiple scatter model for parallel-beam SPECT based on a gamma-ray buildup factor", volume = "52", number = "19", pages = "5785-5802", doi = "10.1088/0031-9155/52/19/004" }
Marinković, P., Ilic, R.,& Spaic, R.. (2007). A 3D point-kernel multiple scatter model for parallel-beam SPECT based on a gamma-ray buildup factor. in Physics in Medicine and Biology, 52(19), 5785-5802. https://doi.org/10.1088/0031-9155/52/19/004
Marinković P, Ilic R, Spaic R. A 3D point-kernel multiple scatter model for parallel-beam SPECT based on a gamma-ray buildup factor. in Physics in Medicine and Biology. 2007;52(19):5785-5802. doi:10.1088/0031-9155/52/19/004 .
Marinković, Predrag, Ilic, Radovan, Spaic, Rajko, "A 3D point-kernel multiple scatter model for parallel-beam SPECT based on a gamma-ray buildup factor" in Physics in Medicine and Biology, 52, no. 19 (2007):5785-5802, https://doi.org/10.1088/0031-9155/52/19/004 . .