X-RAY DETECTION METHOD WITH REFLECTIVE LIQUID CRYSTAL MODULATOR AND ITS APPARATUS

摘要

The present invention relates to X-ray detector written to the liquid crystal modulator, reducing the dose increased accuracy by reducing the noise of the measurement. X-ray detector writing the conventional liquid crystal modulator, which permeable membrane structure was detected at the same time the X-X line and the modulated light. The modulated light is X-rays are absorbed by the sensing part film, so a certain amount of charge generated, mixed with the charge generated in the X-ray signal-to-noise ratio low off the accuracy of the measurement. Also not well known is to the bias voltage applied to the liquid crystal layer and the X-ray detection layer were trial and error to set up optimal conditions. In the present invention, the modulated light from entering the X-ray detection layer, and the invention reflection-type liquid crystal modulator structure leaving a dielectric reflection film and light blocking film with light. The result is the modulated light off the X-ray detection layer, it responds only to the X-ray signal-to-noise ratio increased. I found a way to quantitatively derived in a waveform of the bias voltage conditions, and the optimal amount of X-rays from the reflection characteristic curve of the liquid crystal layer. It was also proposed to obtain the X-ray intensity-modulated light from the reflection measurement. X-ray detector of the present invention are low dose and is suitable for medical use higher the resolution.