Students examine an image produced by a cabinet x-ray system to determine if it is a quality bone mineral density image. Students write in their journals about what they need to know to be able to make this judgment. Students learn about what bone mineral density is, how a BMD image can be obtained, and how it is related to the field of x-ray. Students examine the process used to obtain a BMD image and how this process is related to mathematics, primarily through logarithmic functions. Students study the relationship between logarithms and exponents, the properties of logarithms, common and natural logarithms, solving exponential equations, and Beer's Law.