Cortical bone porosity is a major determinant of bone strength. However, the causes of pathological pore growth are not well understood. The prevalence of blood vessels or marrow fat in pores may serve as an indicator for vessel- or marrow-driven processes. We present an algorithm to combine high resolution CT for pore identification and dynamic contrast enhanced MRI for blood vessel identification. Using this algorithm, imaged vessels are associated with specific pores and pore content is quantified.