[Retracted] Medical Image Encryption Based on 2D Zigzag Confusion and Dynamic Diffusion

Table 5

Local Shannon entropy values of different images.

Images (grey)	Size	Local Shannon entropy (reference range) [37, 38]	Local Shannon entropy	Result
CT	512 × 512	= 0.05 (7.901901305,7.903037329)	7.9024	Pass
MRI	512 × 512	= 0.01 (7.901722822,7.903215812)  = 0.001 (7.901515698,7,903422936)	7.9030	Pass
Ultrasound	512 × 512		7.9028	Pass
X-ray	1024 × 1024		7.9030	Pass
CT-kidney	1024 × 1024		7.9027	Pass