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Table 2 Intraoperative freehandSPECT findings

From: Introducing navigation during melanoma-related sentinel lymph node procedures in the head-and-neck region

  Acquisition time (s) % VOI scanned Reconstruction time (s) No. of SNs on freehandSPECT/total no. of SNs preoperative imaging (%) No. of SNs located with navigation/no. of SNs seen on freehandSPECT (%) Error of navigation per SN (mm) Note
1 85 66.3 31 3/4 (75) 3/3 (75) 7, 8, 4 SN in parotid gland not visible on freehandSPECT
2 100 78 n.n. 3/3 (100) 3/3 (100) 9, 9, 9 Level V cluster of 2
3 121 67.6 87 1/1 (100) 1/1 (100) 5
4 126 51.5 211 1/1(100) 1/1 (100) 2
5 94 71 31 1/1(100) 1/1 (100) 5
6 74 59 89 1/1 (100) 0/1 (0) SN part of IS, navigation not possible; level II SN cluster of 3
7 132 82 135 2/2 (100) 2/2 (100) 0, 5 Level II cluster of 2
8 199 80.4 90 2/2 (100) 2/2 (100) 7, 5
Average 116.4 69.5 96.3    5.8  
Total     14/15 (93.3) 13/14 (92.9)   
  1. SN sentinel node, SPECT/CT single-photon emission computed tomography, VOI volume of interest, 3D three-dimensional, n.n. not noted, IS injection site