Computer Aided Detection of Bone Metastases in the Thoracolumbar Spine - Spinal Imaging and Image Analysis - page 115

11 Results
The results are presented separately for lytic and sclerotic metastasis detection since
they are independent data sets. For each experiment, we present visual detections,
FROC analysis, and etiology of false positives and false negatives.
11.1 Lytic Metastasis Detection Results
Figure 8 shows the examples of detection results for lytic metastasis. Figure 9
shows the FROC analysis on the training and test sets, per-lesion analysis in Fig. 9 a
and per-patient analysis in Fig. 9 b. Given the operating point of 0.5 for the SVM
value, in the training set, the per-lesion sensitivities were 72.4, 84.1 and 91.6 % for
Fig. 8 Lytic metastasis detection. a CT image; b spine segmentation; c watershed segmentation;
d lesion segmentation; e lytic detection in 3D. Green lytic lesion detection; Red vertebra
segmentation; Blue spinal canal