A method for testing a memory device. The present invention is related to a resin composition comprising a fluororesin and a filler low in affinity for said fluororesin, wherein the filler has a d99 value of not more than 15 \u03bcm. The light shroud blocks this ambient light entering the system at angles which allow the light to interfere with the illumination system or camera. A vacuum atmosphere may be used with the application of pressure andor heat. The source images and corresponding segmented images may be temporally-spaced in relation to the cardiac cycle.