Abstract: The present invention relates to the use of diffusion weighted magnetic resonance imaging procedures for the diagnosis of conditions in which blood circulation or similar molecular displacements within biological tissues are measured. Pulse sequences are used in accordance with the invention which suppress the contribution of non-moving tissue or bulk motion.

Abstract: An assay to detect the presence of live non-A, non-B hepatitis virus in vitro. Bone marrow cells are exposed to a body fluid or biological preparation to be tested and the cells are placed in suspension. When using bone marrow cells, growth factors are added to the bone marrow stem cells. Therefore, if the number of colonies growing in the mixture are less than that number present in the culture of cells exposed to a sample that has been determined to contain no live virus, live non-A, non-B hepatitis virus is present in the sample tested. The assay is particularly useful to determine the presence of live non-A, non-B, hepatitis virus in a vaccine.