Post voidal retention in bladder and UTI

I've had PD for 6 years, and the last year of developed a recurring UTI. My PCP suspectsthat it could be because I'm not emptying my bladder entirely, which causes a buildup of urine and germs and that may be because of Parkinson's. I have a ultrasound scan scheduled. Anyone else with UTI problems 6 years into their Parkinson's?