Lasers in Medical Science

, Volume 12, Issue 3, pp 200–208 | Cite as

Tumour visualization in a murine model by time-delayed fluorescence of sulphonated aluminium phthalocyanine

  • R. Cubeddu
  • G. Canti
  • P. Taroni
  • G. Valentini
Original Articles


Mice bearing the MS-2 fibrosarcoma were administered 0.25, 0.5 or 1 mg kg-1 body weight (b.w.) of sulphonated aluminium phthalocyanine (AlS2Pc) (with average degree of sulphonation of 2.1), and time-gated fluorescence images were acquired up to 6 h after the injection. Different excitation wavelengths (610, 650 and 670 nm) were tested. Red light excitation and 3 ns delayed detection allow one to minimize natural fluorescence and scattered laser light, respectively. The best conditions for tumour detection are reached under either 650 or 670 nm Excitation, 2–4 h after the administration of either 0.5 or 1 mg kg-1 b.w. of AlS2Pc. In these situations, the average fluorescence contrast between tumour area and surrounding healthy tissue is > 2, providing a clear identification of the pathological region. However, tumour localization is possible even after the injection of 0.25 mg kg-1 b.w. of sensitizer. In conclusion, under low power excitation (< 100ΜW cm-2), the technique allows real time detection of an intradermal tumour with good contrast.

Key words

Fluorescence Imaging Phthalocyanine Timegated imaging Tumour detection 


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Copyright information

© W.B. Saunders Company Ltd 1997

Authors and Affiliations

  • R. Cubeddu
    • 1
  • G. Canti
    • 2
  • P. Taroni
    • 1
  • G. Valentini
    • 1
  1. 1.C.E.Q.S.E.-C.N.R.Politecnico di MilanoMilanoItaly
  2. 2.Dipartimento di FarmacologiaUniversità degli StudiMilanoItaly

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