Fig. 7.

Raman spectra of tissue phantoms were used to determine noise floor and attenuation region for the measurement of hydroxyapatite (HAp) with the current system. These measurements were performed with the bare bone inclusion after it was removed from the plastic centrifuge tube. Raman HAp signal normalized to Cytop Raman signal is shown against the concentration of HAp in the “bone” inclusion. Collection signal from collection fibers corresponding to approximately 45^◦, 90^◦, 135^◦ and 180^◦ are presented.