With Wednesday's victory, Susquehanna is currently tied with Moravian for the final Landmark Conference playoff spot.
"We needed this," Marcinek said. "We need a bunch of these yet."
Goucher, which trailed by as many as 21 in the first half, got the deficit down to 13 at halftime (34-21) and then was within five in the second half.
But the Crusaders had an answer. With 5:09 to go, Dean made a big three-point play to push the lead back up to 10.