Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Normalized and standardized grayscale images at baseline and year 3 demonstrating a decrease in GSM value from baseline to year 3. In this subject, the GSM decreased from 39.94 units at baseline to 26.62 units at year 3. GSM = grayscale median value, GLDS-CON = gray level difference statistics method for calculating contrast, SGLDM-ASM(x103) = spatial gray level dependence matrices method for calculating angular second moment x 1000.
