Inclusion Criteria:

Adult participants (age ≥ 18 years).

For the Paired Donor-Recipient Cohort:

Donor: Scheduled for living kidney donation, OR is a deceased organ donor who can undergo a pre-transplant MRI.

Recipient: Recipient of a kidney transplant or simultaneous pancreas-kidney transplant from the paired donor.

For the Independent Recipient Cohort:

Recipient: Recipient of a kidney transplant from a deceased donor for whom donor baseline data is unavailable.

Able to provide informed consent.

Exclusion Criteria:

Any contraindication to MRI (e.g., cardiac pacemaker, non-MRI compatible metallic implants, neurostimulators, severe claustrophobia).

Inability to tolerate the breath-holding required for MRI acquisition.

Pregnancy.

Any clinical condition that, in the investigator's judgment, would severely compromise study participation or data integrity (e.g., uncontrolled severe infection, active major psychiatric illness).