title: [Development of simple processing for deleting undershooting artifact using the FBP method ─evaluation of simulation data─].
abstract: The undershooting artifact occurs using the filtered back projection (FBP) method. This artifact is influenced by a ramp filter. Thereby, the fall of the target accumulation and a deficit arise and it becomes a clinical problem. We developed a new image reconstruction method based on the FBP method to delete the undershooting artifact of FBP. The image quality of the FBP method is equivalent to that obtained by an evaluation using a digital phantom. The two segmentation and ordinary FBP methods were evaluated in terms of hot contrast, cold contrast, coefficient of variation (%CV), and root mean square uncertainty (%RSMU). The two segmentation FBP method showed equivalent values of hot contrast, % CV, and% RSMU compared with those of the ordinary FBP method. With a threshold level value, cold contrast sharply changed. However, when the threshold level of the two segmentation FBP method was set as the proper value, 90% contrast was obtained. It is necessary to set a threshold level as a proper value using the two segmentation FBP methods. I thought that it can delete an artifact in a simple way, without impairing the image quality. However, it is an examination of only a digital phantom this time. Before using it clinically, one has to use and verify a real phantom.
authors: Radiological Center, University of Fukui Hospital; Department of Quantum Medical Technology, Graduate School of Medical Sciences, Kanazawa University.
authors: Akinobu
authors: A
authors: Kita
authors: Masahisa
authors: M
authors: Onoguchi
authors: Katsuya
authors: K
authors: Sugimoto
authors: Tatsurou
authors: T
authors: Tsuchida
authors: Akiko
authors: A
authors: Toi
authors: Takahiro
authors: T
authors: Kishimoto
authors: Masato
authors: M
authors: Shimada
authors: Toshiki
authors: T
authors: Adachi
mesh_terms: D016477:Artifacts; D003198:Computer Simulation; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods*