**Multifrequency MRE in Evaluation of Chronic Kidney Diseases** Chronic Kidney Disease (CKD) affects many people worldwide, often leading to serious health problems or the need for kidney treatments. A common issue in CKD is kidney fibrosis, which is scarring in the kidneys. This study looks at a new way to check for kidney fibrosis using a technique called Magnetic Resonance Elastography (MRE). MRE is similar to MRI but focuses on how stiff the kidney tissue is. A biopsy, which is taking a small piece of kidney tissue for testing, is the usual way to check for fibrosis, but it's invasive and not perfect. MRE could be a better, noninvasive way to assess fibrosis, especially in early-stage CKD. This study will explore how well MRE works for this purpose. **Key Points:** - Study involves CKD patients aged 18-65 who have had an MRI and are scheduled for a biopsy. - Participants must complete an MRE scan within 3 days before their biopsy. - People with electronic devices that aren't safe for MRI, pregnant women, or those with severe anxiety should not participate.