title: [Usefulness of attenuation correction with transmission source in myocardial SPECT].
abstract: Attenuation correction in SPECT has been used for uniformly absorptive objects like the head. On the other hand, it has seldom been applied to nonuniform absorptive objects like the heart and surrounding lungs because of the difficulty and inaccuracy of data processing. However, since attenuation correction using a transmission source recently became practical, we were able to apply this method to a nonuniform absorptive object. Therefore, we evaluated the usefulness of this attenuation correction system with a transmission source in myocardial SPECT. The dose linearity, defect/normal ratio using a myocardial phantom, and myocardial count distribution in clinical cases was examined with and without the attenuation correction system. We found that all data processed with attenuation correction were better than those without attenuation correction. For example, in myocardial count distribution, while there was a difference between men and women without attenuation correction, which was considered to be caused by differences in body shape, after processing with attenuation correction, myocardial count distribution was almost the same in all cases. In conclusion, these results suggested that attenuation correction with a transmission source was useful in myocardial SPECT.
authors.affiliation: Department of Radiology, National Cardiovascular Center.
authors.forename: Keizo
authors.initials: K
authors.lastname: Murakawa
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Katafuchi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nishimura
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Enomoto
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Sago
authors.forename: Hisashi
authors.initials: H
authors.lastname: Oka
mesh_terms: D000368:Aged; D002138:Calibration; D005260:Female; D005682:Gadolinium; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D019047:Phantoms, Imaging; D011868:Radioisotopes; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods*
chemical_list: D011868:Radioisotopes; D005682:Gadolinium