The Celtics won’t get any bonus points if they can end Miami’s 22-game winning streak tonight. Because the NBA isn’t the NCAA, they won’t get a better seeding in a region closer to home by impressing a roomful of selectors.

But for a team that’s still building its self-image after the loss of its All-Star point guard, a win over the Heat could make the Celtics look better in the mirror. Even better still if they can accomplish the task without Kevin Garnett (strained adductor), who did not practice yesterday after missing Saturday’s win over Charlotte.

“We don’t know what he’s going to do (today),” coach Doc Rivers said of Garnett’s availability. “My guess is 50-50 at best.”

Questions are more readily raised when a 36-year-old gets an injury of any type, but Rivers placed his level of concern at “probably 1 on a scale of 10. Even if he misses a couple of games, it’s not an injury that’s a big deal. So I’m not that concerned by it.”

Asked if Garnett had undergone an MRI, Rivers said, “I don’t think it’s that serious, but it’s just at that point in the year where you’re just not going to play him if he’s not feeling great.”

And while a victory over Miami, such as the one the Celts had Jan. 27 (100-98 in double overtime), would feel rather nice, Rivers doesn’t believe it would have more value than any other.

“No, I don’t think so,” he said. “I think for short term, but what does that get you when you play Atlanta in the first round? You know, it doesn’t do anything that you beat Miami. They could care less. If you caught Miami later, I guess for us, knowing that you can beat them. But we already know that. We’ve beaten them earlier in the year.