title: [An investigation of the effect of gamma rays emitted by patients undergoing radionuclide bone scintigraphy in computed radiography during X-ray mammography examination].
abstract: For convenience of outpatients, mammographies of outpatients are often taken after the injection of a radionuclide. In this study, we investigated the effects of gamma rays emitted by a patient onto imaging plates (IPs). We used a flat container filled with (99m)Tc solution as a planar source to irradiate gamma rays onto IPs. We changed irradiation times on each IP, and took radiographies of an ACR-specified 156 model phantom and AGH-D210F phantom. We evaluated radiography images, using visual evaluation, and profile curves, histograms, and CNR and RMS granularities analyses. The results indicated that the depiction ability of a fibrous part began to fall when the irradiation time exceeded 3 minutes. With an increase in irradiation time, an increase in pixel value and RMS granularity value and a decrease in CNR value were observed. In conclusion, IP exposed by gamma rays influenced the evaluation of phantom images.
authors.affiliation: Department of Radiology, Mie University Hospital.
authors.forename: Akira
authors.initials: A
authors.lastname: Kamigiri
authors.forename: Naoki
authors.initials: N
authors.lastname: Nagasawa
authors.forename: Masami
authors.initials: M
authors.lastname: Yamaji
authors.forename: Mikako
authors.initials: M
authors.lastname: Nakamura
authors.forename: Morihiro
authors.initials: M
authors.lastname: Ito
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nakanishi
authors.forename: Tokio
authors.initials: T
authors.lastname: Kitano
mesh_terms: D001842:Bone and Bones / Q000000981:diagnostic imaging*; D005720:Gamma Rays; D008327:Mammography; D019047:Phantoms, Imaging; D011877:Radionuclide Imaging; D014057:Tomography, X-Ray Computed