To achieve these goals, the investigators will perform pilot MRI studies with kidney transplant patients. The investigators will study if MRI can reflect different levels of kidney function. The investigators will also evaluate if MRI can differentiate causes for declining kidney function. Finally, the investigators will explore how MRI measures changes before and after medical treatment for worsening kidney function.~Subjects may be invited for MRI exams with different exam options. An MRI exam may use either of two types of MRI machines at the CMRR: the 3T scanner and the 7T scanner. Subjects may also be invited for a multi-session exam. A description of the MRI exam types with different exam options and the types of multi-session exams is provided later in this document.
The goals of this study are:~To optimize and evaluate multiple kidney MRI methods; and~To investigate the potential of MRI in the assessment of transplant kidney functions; To achieve these goals, we will perform pilot MRI studies with kidney transplant patients. We will study if MRI can reflect different levels of kidney function. The investigators will also evaluate if MRI can differentiate causes for declining kidney function. Finally, the investigators will explore how MRI measures changes before and after medical treatment for worsening kidney function.~You may be invited for MRI exams with different exam options. An MRI exam may use either of two types of MRI machines at the center for magnetic resonance research (CMRR): the 3 Tesla (3T) scanner and the 7 Tesla (7T) scanner. You may also be invited for a multi-session exam. A description of the MRI exam types with different exam options and the types of multi-session exams is provided later in this document.