Abstract: An entry step lighting system for a deployable aircraft stairway. The system includes steps that having integrated light sources that direct and provide illumination to the steps. Some light sources illuminate strip lenses which indicate proximity to the step edges. Light emitted by a second group of light sources is directed into an angled face established on a riser wall between each step. The light bounces off of each angled face to illuminate the step below.

Abstract: Disclosed herein are fiducial markers that include a sealed casing member containing a mixture of iodine and water that includes about 1-300 mg/ml iodine. The fiducial markers may be distinguishable on at least two imaging modalities, such as CT and MRI. The casing member may include a plastic or elastomeric material, such as polyvinyl chloride (PVC) polypropylene, latex, nylon, dynaflex, and may take the form of a length of IV tubing sealed at each of two ends. The length of IV tubing may be crimped to form a desired shape, such as a triangle. Also disclosed are methods of making fiducial markers that are distinguishable on at least two imaging modalities, such as CT and MRI.