Establishing Daily Applicable Parameters for Using Magnetic Resonance Spectroscopy of Spinal Cord

To learn if MRS can effectively assess spinal cord lesions.

Inclusion Criteria: Volunteers: * Adults \> 18 years * Healthy with no malignancy, demyelinating disease, back pain, degenerative disease, or spinal cord lesions. * Consent able patients. Patients with low volume LMD to receive treatment CNS radiation: * Adults \> 18 years old. * MR or CSF with evidence of LMD. * Patients to receive CSI as part of standard treatment of LMD disease. * Consent able patients, willingness and ability to comply with the study procedures. * No spinal cord lesions only LMD disease * Recruitment by radiation oncology faculty in consultation with Dr. De. . . Exclusion Criteria: Volunteers: * Age \< 18 years * Pregnant or breastfeeding individuals. * History of cancer. * History of spinal cord lesions including malignant, demyelinating, or inflammatory. * History of prior spinal surgery. * History of implantable devices. * History of MR claustrophobia. * Degenerative disease or spinal/back pain including myelopathy and radiculopathy. * Scoliosis. Patients with LMD: * Age \< 18 years * History of spinal cord lesions including malignant, demyelinating, or inflammatory. * History of prior spinal surgery. * History of implantable devices. * History of MR claustrophobia. * Degenerative disease or spinal/back pain including myelopathy and radiculopathy. * Scoliosis.