| 摘要 |
PURPOSE:To improve the quantitative measurement accuracy by a method wherein a radiation source and a collimator are rotated integrally about an object and a data on the absorption of a radiation passing through the object is detected with a radiation detector to correct the data concerning the concentration distribution of a radioactive isotope. CONSTITUTION:A lead shield 4 and a collimator 5 rotate integrally being held with a frame 6. A radiation emitted from a radiation source 7 passes through an object 3 and enters a radiation detector 1 via the collimator 5. As an output is obtained from the radiation detector 1 according to the attenuation of the radiation depending on the object 3, a data is detected from the radiation detector 1 concerning the absorption of the radiation in the object 3. Data can be collected in any direction by rotating the frame 6 to obtain a distribution image of a radiation absorption coefficient. The lead shield 4 and the collimator 5 are removed together with the frame 6 and instead, a normal collimator is mounted to collect data. The data is corrected by said data of radiation absorption coefficient distribution to remove the effect thereof. |
