Speaker
Mr
Vyacheslav Pedash
(Institute for scintillation materials NAS of Ukraine)
Description
Gamma-camera use for a breast imaging (Scinti-Mammography) is a quite difficult task
because of specific geometry. Edge artefact is the main problem that should be solved
in imaging system. Reduced FOV near edges relates to scintillation detector non
uniformity and image reconstruction problems. The scale of the “dead zone” usually
corresponds to the half of the PMT size used with detector plate.
The non-planar conical scanning scheme is proposed to overcome the problem. The
object is projected on the series of planes, which are tangent to some cone. The
object is positioned inside cone aperture. In return for expanded field of view
slight deterioration in spatial resolution, especially along cone axis was obtained.
Whole set of projections doesn’t give complete data for the proper tomography
reconstruction. The dependence of reconstruction accuracy on opening angle of the
cone is analyzed and the mathematical simulation results are given for the several
opening angles. Reconstruction algorithm was tested on phantom using conventional
whole body gamma-camera.
The obtained results prove the general concept. The use of proposed method allows
extending FOV of SPECT systems, especially dedicated imagers such mammo-SPECT.
Author
Mr
Vyacheslav Pedash
(Institute for scintillation materials NAS of Ukraine)
Co-authors
Dr
Alexander Demin
(Institute for scintillation materials NAS of Ukraine)
Prof.
Alexander Gektin
(Institute for scintillation materials NAS of Ukraine)
Dr
Vadim Gayshan
(ScintiTech, Inc. Waltham, MA, USA)
