[Investigation on feasibility of using a gamma camera for the measurement of blood radioactivity].
The present study was undertaken to determine whether gamma cameras can be used to measure radioactivity in samples, e.g. in blood. Aqueous 123I solution with a concentration of 10.3 MBq/ml was infused at a volume of one ml into a blood-sampling vial having an internal diameter of 22.5 mm. Various concentrations of radioactivity were generated by leaving the vial and taking radioactive decay into account. Static images were acquired for five minutes with a gamma camera using a 64 x 64 matrix to measure radioactivity counts, and the regions of interest with 7 x 7 pixels (21 mm x 21 mm) were defined on the image. The results showed that there was a good linear correlation between the radioactivity counts measured with the gamma camera without collimator and those measured with the well-type scintillation counter in the range between 0.032 kBq/ml and 279 kBq/ml. It therefore appears that gamma cameras can be substituted for well-type scintillation counters in the measurement of radioactivities in samples.
Department of Radiology, Matsuyama Shimin Hospital.
H
H
Fujioka
K
K
Murase
T
T
Inoue
Y
Y
Ishimaru
A
A
Akamune
S
S
Tanada
J
J
Ikezoe
D001769:Blood / Q000000981:diagnostic imaging*; D015902:Gamma Cameras; D006801:Humans; D066298:In Vitro Techniques; D011877:Radionuclide Imaging; D012588:Scintillation Counting / Q000295:instrumentation*