| 摘要 |
PURPOSE:To shorten the time before an image is obtained, by storing a unidimensional position signal obtained from a coordinates converter circuit for performing the coordinates exchange of a position signal corresponding to the rotary angle of a collimator at each position thereof to obtain unidimensional distribution data. CONSTITUTION:Collimation is performed in the plane parallel to an X-Z plane so as to be limited to a Z-direction by a parallel flat plate shaped collimator 11 but is not performed in the plane parallel to a Y-Z plane and even radioactive rays arrived from either directions are incident to a scintillator 2. An incident position is not discriminated in a Y-direction but calculated only in an X-direction and the count value of the incident numbers of radioactive rays at every each direction in the X-direction is calculated and the unidimensional distribution data of this count value in the X-direction is obtained. Subsequently, the collimator 11 is rotated around a Z-axis and unidimensional distribution data at every each rotary angle is stored in a memory circuit 9. When said collimator 11 is rotated 180 deg., unidimensional distribution data can be collected in all directions and subjected to image re-constitution treatment in an operation treatment apparatus 10 to obtain the two-dimensional distribution image of a radioactive isotope on the X-Y plane. |
