Former Philadelphia Traffic Court Judge Robert Mulgrew will serve 18 months in prison for perjury in front of the grand jury that was investigating ticket-fixing in his court, under a sentence delivered Wednesday by a federal judge.

Following an indictment from that grand jury, Mulgrew stood trial this summer with several other judges from the Traffic Court. The jury returned convictions of perjury for three of them and Mulgrew is the first to be sentenced.