A Novel Random Error Approximate Adder-Based Lightweight Medical Image Encryption Scheme for Secure Remote Monitoring of Health Data

Table 6

Measured entropy values of sample images before and after encryption.

Modality	Sample image	Size	NPCR (%)	UACI (%)
X-ray	Chest	512 × 512	99.615	33.653
CT scan	Chest	512 × 512	99.258	33.374
MRI	Brain	512 × 512	98.995	33.391
Ultrasound	Fetal	512 × 512	99.579	33.521
PET	Brain	256 × 256	99.571	33.518