In general, yes, I'd say that NT Authentication is a type of SSO.
Windows authentication uses several protocols, but I'd say it is to some degree based on a SSO technology called Kerberos. It mainly manages a set of "tokens" which are digitally signed and timestamped, granting you access to several resources without the need of those resources to contact the central authentication server (int this case, usually aDomain controller).
Your NT authentication session typically starts when your login to Windows. From there it is used to manage your access tokens to several services. A service can however authenticate a user via other mechanisms:
Windows provides several backends for services to authenticate users, including plain Kerberos, NTLM (a browser oriented authentication method, which maybe you were referring to), and others, through its "security support provider interface", named SSPI.