Photo-Guided Sentinel Node Mapping in Breast Cancer Using Marker-Free Photo-Gamma Fusion Lymphoscintigraphy

Eun Seong Lee, In Kook Chun, Seunggyun Ha, Hai jeon Yoon, So Youn Jung, Seeyoun Lee, Seok Won Kim, Eun Sook Lee, Taeyoon Kim, Kwang Gi Kim, Byung Il Lee, Tae Sung Kim, Seok ki Kim

Research output: Contribution to journalArticlepeer-review


Purpose: Photo-gamma fusion lymphoscintigraphy (PGFLS) was developed by overlying a conventional planar gamma image on a photograph for the guidance of sentinel node biopsy. The feasibility and accuracy of PGFLS was assessed in breast cancer patients. Methods: A digital camera and a gamma camera were coordinated to obtain photograph and gamma images from the same angle. Using the distance to the object and calibration acquisition with a flat phantom and radioactive markers, PGFLS was performed both in phantom and in patients without fiducial markers. Marker-free PGFLS was verified using flat phantom, anthropomorphic phantom with markers simulating sentinel nodes and breast cancer patients. In addition, the depth of the radioactive marker or sentinel node was calculated using two gamma images taken at right angles. The feasibility and accuracy of PGFLS were assessed in terms of mismatch errors of co-registration and depth with reference to the data from SPECT/CT. Results: The mismatch error was less than 6 mm in the flat phantom image at a distance from 50 to 62 cm without misalignment. In the anthropomorphic phantom study, co-registration error was 0. 42 ± 0. 29 cm; depth error was 0. 51 ± 0. 37 cm, which was well correlated with the reference value on SPECT/CT (x scale: R2 = 0. 99, p < 0. 01; y scale: R2 = 0. 99, p < 0. 01; depth: R2 = 0. 99, p < 0. 01). In ten patients with breast cancer referred for lympho-SPECT/CT, PGFSL enabled photo-guided sentinel lymph node mapping with acceptable accuracy (co-registration error, 0. 47 ± 0. 24 cm; depth error, 1. 20 ±0. 41 cm). The results from PGFSL showed close correlation with those from SPECT/CT (x scale: R2 = 0. 99, p < 0. 01; y scale: R2 = 0. 98, p < 0. 01; depth: R2 = 0. 77, p < 0. 01). Conclusions: The novel and convenient PGFLS technique is clinically feasible, showing acceptable accuracy and providing additional visual and quantitative information for sentinel lymph node mapping. This approach will facilitate photo-guided sentinel lymph node dissection in breast cancer.

Original languageEnglish
Pages (from-to)9-17
Number of pages9
JournalNuclear Medicine and Molecular Imaging
Issue number1
StatePublished - Mar 2013


  • Photo-gamma fusion lymphoscintigraphy
  • Sentinel lymph node


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