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  • MEASUREMENTS
  • The graphs (Figures 1 and 2) below show the primary tumor growth (traditional caliper measurements) and the progression of metastatic disease to the lymph nodes (BLI signal measured in photons/sec). (mibioresearch.com)
  • emission
  • The absorbed energy is re-emitted as light upon heating of the material, which enables the trapped states to interact with phonons (lattice vibrations), to rapidly decay into lower-energy states, causing photon emission. (medimaging.net)
  • typically
  • Typically the energy source produces photons at two different energy levels, which pass through body tissues and are blocked at rates related to its basic composition. (guilfordradiology.com)
  • method
  • The method, which uses X rays rather than gamma rays as its photon source, represents a significant improvement over present systems both in image quality and precision (reproducibility) of results, which is better than 1% in vivo. (ucl.ac.uk)
  • source
  • DPA differentiates bone from soft tissue by differential absorption coefficients of two photon energies emitted from a 153 Gd-isotope source. (jci.org)