Preoperative prediction of lymphovascular and perineural invasion in gastric cancer using spectral computed tomography imaging and machine learning

Figure 3 Example of the energy spectrum data measurement. A: 70 keV single-energy image; B: The iodine base image; C: The energy spectrum curve. Elliptical regions of interests were drawn at the largest level of the lesion in the lesser curvature of the gastric horn, as shown in A and B.