Assessment of Kidney Function by Electrical Impedance Tomography (EIT)

This study is testing whether electrical impedance tomography (EIT) — a painless, non-invasive scanning technique that uses small electrical currents — can accurately measure how well the kidneys are functioning in people with chronic kidney disease (CKD). Currently, kidney function is assessed mainly through blood and urine tests. Researchers want to see if EIT could provide a new, real-time way to monitor kidney health without needles or radiation. **You may be eligible if...** - You are between 18 and 90 years old - You have been diagnosed with chronic kidney disease at any stage (1 through 5), confirmed by GFR measurement - You are willing to have EIT sensors placed on your abdomen for a non-invasive scan - Healthy adults without kidney disease are also eligible as controls **You may NOT be eligible if...** - You have had any kidney surgery or a kidney transplant - You have damaged or broken skin on your abdomen where sensors would be placed - You have an implanted electronic device (such as a pacemaker) - You have a spinal condition that makes lying still uncomfortable - You have had recent abdominal surgery - You are pregnant, or have a BMI above 35, or have a movement disorder (such as tremors or Parkinson's disease) Talk to your doctor to see if this trial is right for you.