[Crosstalks onto photopeak windows of 99mTc and other radionuclide (201Tl, 123I or 111In) in simultaneous acquisitions using a scinticamera--a fundamental study through phantom experiments].
In simultaneous acquisitions of both 99mTc and other radionuclide, there are crosstalks onto those photopeak windows. Therefore, to quantify the organ uptake in scintigraphic imaging, it is important to correct the crosstalk counts. The purpose of this study is to estimate the crosstalk fractions onto each photopeak window from other radionuclide. Those crosstalk fractions were determined from pulse height spectra, which were measured by inputting signals from a scinticamera into a multi-channel (2048 ch) pulse height analyzer. Four types of collimators, which are HR (high resolution), AP (all purpose) for low energy, ME (medium energy) and HE (high energy), as well as cuboid phantoms (10 x 10 x 10 cm3) were used in this experiment. The crosstalk fractions have a tendency to show small increases at the window width of 10 to 20%, excepting at 30%, a small change for the source thickness from 1 to 7 cm, and the least with the ME-collimator. The crosstalk fractions using the ME-collimator were obtained as follows, when the source thickness and the window width were 5 cm and 15%, respectively. 99mTc and 201Tl: 9.4% onto 201Tl window and 7.3% onto 99mTc window, 99mTc and 123I: 36.1% onto 99mTc window and 14.8% onto 123I window, 99mTc and 111In: 32.6% onto 99mTc window and 6.1% onto 111In window.
Saegusa
K
K
Division of Radiological Technology, Tokyo Metropolitan College of Allied Medical Sciences.
Fukushi
M
M
Saitoh
H
H
Irifune
T
T
D015902:Gamma Cameras; D005720:Gamma Rays; D007205:Indium Radioisotopes; D007457:Iodine Radioisotopes; D008961:Models, Structural; D013667:Technetium; D013794:Thallium Radioisotopes
D007205:Indium Radioisotopes; D007457:Iodine Radioisotopes; D013794:Thallium Radioisotopes; D013667:Technetium