Radiation image obtaining apparatus

摘要

A radiation image obtaining apparatus having an anti-scatter grid effectively eliminates an effect of scattered beams even in cases where the radiation image is taken using a radiation beam generated with a relatively high peak voltage. A source of the radiation beam generates the radiation beam with a peak voltage as high as 50-150 kvp, which generally induces the scattered beams of high intensities. The anti-scatter grid is an air-grid or a foamed material grid exhibiting direct beam transmittance of 70% or more for the generated radiation beam. An image signal representing a radiation image of a high S/N ratio containing only little noise due to the scattered beams can be obtained even with such a high peak voltage, as the transmittance of the radiation beam can be maintained at a high level while the effect of the scattered beam is eliminated.