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

Table 4

Correlation coefficients of different modality medical images.

Sample medical image	Horizontal		Vertical		Diagonal
	Plain image	Ciphered image	Plain image	Ciphered image	Plain image	Ciphered image
X-ray chest	0.9965	−0.2898	0.9963	−0.0205	0.9928	−0.0109
CT scan chest	0.9943	−0.0570	0.9895	−0.0073	0.9873	0.0168
MRI brain	0.9777	−0.1135	0.9833	0.0156	0.9581	0.0219
Ultrasound fetal	0.9938	−0.0279	0.9863	−0.0122	0.9809	−0.0049
PET brain	0.9674	−0.0766	0.9768	0.0316	0.9426	0.0194