Advances in the imaging of gastroenteropancreatic neuroendocrine neoplasms

Figure 7 Intravoxel incoherent motion diffusion-weighted imaging in a 46-year-old woman with proven grade 1 pancreatic neuroendocrine neoplasm. A: Axial diffusion weighted image (b = 800 s/mm²) shows a small pancreatic lesion with diffusion restriction (arrow); B: Color-coded diffusion map shows true diffusion coefficient, D = 2.33 × 10³ mm²/s; C: Color-coded perfusion map shows pseudodiffusion coefficient, D* = 5.37 × 10³ mm²/s); D: Color-coded perfusion fraction map shows a value, f = 3.2%; E: Signal decay curve of the tumor (purple) shows fall in signal at lower b values with plateau at higher b values. In comparison, normal pancreas (orange) shows lesser diffusion restriction than the tumor.