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Oncological diagnosis using positron coincidence gamma camera with fluorodeoxyglucose in comparison with dedicated PET

H Zhang, DMSc 1,2 M Tian, MD 1 N Oriuchi, MD 1 T Higuchi, MD 1 S Tanada, MD 2 and K Endo, MD 1

1 Department of Nuclear Medicine and Diagnostic Radiology, Gunma University School of Medicine, Showa-machi 3-39-22, Maebashi, Gunma 371-8511 and 2 Department of Medical Imaging, National Institute of Radiological Sciences, 9-1, Anagawa-4, Inage-ku, Chiba 263-8555, Japan



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  		Figure 1. Patient 2, oesophageal cancer with mediastinal lymph node metastases. (A) Chest CT image shows the primary lesion (arrow). Coronal views of (B) 18F-fluorodeoxyglucose (FDG) positron emission tomography and (C) FDG dual-head positron coincidence determination gamma camera detection show increased uptake in the node (upper arrows) and the primary lesion (lower arrows).

 


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  		Figure 2. Patient 23, soft tissue tumour (neurinoma), 3.5 cm greatest diameter. (A) MRI image shows tumour in leg (arrow). Coronal views of (B) 18F-fluorodeoxyglucose (FDG) positron emission tomography and (C) FDG dual-head positron coincidence determination gamma camera detection show tumour uptake (arrows).

 


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  		Figure 3. Patient 25, uterine cancer with paraaortic lymph node metastases. (A) Abdominal CT image shows enlarged paraaortic lymph node (arrow). Coronal views of (B) 18F-fluorodeoxyglucose (FDG) positron emission tomography and (C) FDG dual-head positron coincidence determination gamma camera detection show metastatic lymph node (arrows).

 


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  		Figure 4. Percentage of lesion detected by 18F-fluorodeoxyglucose (FDG) positron emission tomography ({blacksquare}) and FDG dual-head positron coincidence determination gamma camera detection () imaging with respect to size using CT or histopathologic confirmation as the gold standard.

 


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  		Figure 5. Relationship between lesion size and tumour-to-background ratio (T/B ratio) obtained by 18F-fluorodeoxyglucose (FDG) positron emission tomography (PET) (a) and FDG dual-head positron coincidence determination gamma camera detection (PCD) (b). No correlation is observed between lesion size and T/B ratio by either FDG PCD or FDG PET.

 


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  		Figure 6. Comparison of tumour-to-background ratio (T/B ratio) of 18F-fluorodeoxyglucose (FDG) positron emission tomography (PET) and FDG dual-head positron coincidence determination gamma camera detection (PCD). T/B ratio of FDG PCD (3.5±3.3) is significantly lower than obtained by FDG PET (8.4±7.1, p<0.001).

 


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  		Figure 7. Relationship between tumour-to-background ratio (T/B ratio) of 18F-fluorodeoxyglucose (FDG) PET and FDG dual-head positron coincidence determination gamma camera detection (PCD). Significant positive correlation is observed between T/B ratios obtained by FDG PET and FDG PCD.

 




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