Noninvasive Ultrasound Assessment of Detrusor Dysfunction

This study tests a non-invasive ultrasound technique to assess how well the bladder muscle (detrusor) is working in people with bladder problems. It compares the ultrasound measurements to traditional urodynamic study (UDS) tests — which involve bladder catheters. If the ultrasound works well, it could replace or complement uncomfortable invasive testing for diagnosing bladder dysfunction. You may be eligible if: - You are over 18 years old and scheduled for a standard bladder function test (urodynamics) for a bladder condition; OR - You are over 45 years old and scheduled for prostate surgery (photovaporization) You may NOT be eligible if: - Your BMI is above 35 - You have a neurological disease affecting your bladder (e.g., spinal cord injury, MS, Parkinson's, prior stroke) - You have had pelvic radiation therapy - You have had major pelvic surgery (such as for cancer) or prior bladder surgery - You are pregnant or breastfeeding Talk to your doctor to see if this trial is right for you.