A method for classifying tissue in a magnetic resonance image, and particularly for measuring a volume of pathological tissue such as white tissue hyperintensity in the brain based on the segmentation of the intensity histogram of fluid attenuated inversion recovery images is described. One of the compositions is a resin composition comprising the following polymers, and andor. The second laser element emits a laser beam having a second wavelength. The length of each buffer is substantially the same, and is within the range of 1. A metering device is disposed within the lumen in the casing and is electrically connected to the control circuit. The trigger module is adjustable to adjust various properties of the trigger.