Figure 3.

Illustration of the effects of different image processing steps in coronal view. Two representative cases with the sharp low functional and gradient low functional were visualized for comparison. The SPECT perfusion was normalized using the approach described in the method section. The color means the perfusion level. SPECT-disc. was the discretized label. CTPM was generated using the proposed setting. The following CTPMs were generated with five ablation scenarios: disc.—remove label discretization; contr.—remove CT contrast enhancement; med. —remove the median filter in CT low functional enhancement; uni.—remove the uniform filter in CT low functional enhancement.