TABLE 4.

Quantitative comparison of harmonization using different reference images.

	Site‐related scans		Same‐site scans
	SSIM	PSNR	SSIM	PSNR
Before harm	$0.928\pm 0.033$	$24.573\pm 2.713$	$0.952\pm 0.008$	$26.409\pm 1.078$
Ref 1	$0.945\pm 0.025$	$26.366\pm 2.098$	$0.969\pm 0.009$	$28.492\pm 1.211$
Ref 2	$0.942\pm 0.021$	$26.781\pm 2.278$	$0.971\pm 0.012$	$28.189\pm 1.009$
Ref 3	$0.951\pm 0.026$	$26.173\pm 2.109$	$0.965\pm 0.009$	$27.709\pm 1.013$
Ref 4	$0.948\pm 0.027$	$25.891\pm 1.889$	$0.968\pm 0.007$	$28.610\pm 1.468$
Ref 5	$0.946\pm 0.031$	$26.257\pm 2.179$	$0.973\pm 0.008$	$27.902\pm 1.177$

Abbreviations: PSNR, peak signal‐to‐noise ratio; SSIM, structural similarity index.