1. A method for splicing medical image datasets, comprising: acquiring a first medical image dataset with a first acquisition process to produce an image of a lung that has sharply defined blood vessels and noisy soft tissue; segmenting the first medical image dataset to create a first mask that distinguishes between points of the sharply defined blood vessels and the noisy soft tissue; acquiring a second medical image dataset with a second acquisition process to produce another image of the lung where the blood vessels are noisy and the soft tissue is sharply defined; segmenting the second medical image dataset to create a second mask that distinguishes between points of the noisy blood vessels and the sharply defined soft tissue; and creating a spliced image of the first and second medical image datasets by removing the noisy blood vessels from the second mask and inserting the sharply defined blood vessels from the first mask into the second mask, wherein the spliced image only includes the modified second mask, wherein the method is performed using a processor.