mrimaster

MEDIC/MERGE/M-FFE MRI

Multiple Echo Data Image Combination (MEDIC) is a T2*-weighted spoiled gradient echo sequence. Multiple echoes acquired in one measurement are combined into an image. This sequence uses flow compensation unipolar frequency encoding gradients that remove CSF flow artifacts. MEDIC sequences produce a predominantly T2-weighted image.

MRI image appearance in MEDIC

The simplest method for identifying MEDIC images involves observing fluid-filled spaces within the body, such as cerebrospinal fluid in the brain ventricles and spinal canal, synovial fluid in joints, or pathological fluid accumulations. On MEDIC images, fluids typically exhibit a bright appearance, while muscles and fat generally appear as shades of gray.

Tissues and their MEDIC appearance

Bone marrow – dark
Muscles – bright gray
Fat – gray (darker than muscle)
Moving blood– bright
Spinal cord – gray
Cartilage – bright
Fluids – bright
Bone – dark
Air – dark

Use

AXIAL MEDIC SEQUENCE USED IN C SPINE IMAGING

AXIAL MEDIC SEQUENCE USED IN WRIST IMAGING

SAGITTAL MEDIC SEQUENCE USED IN KNEE IMAGING

AXIAL MEDIC SEQUENCE USED IN ELBOW IMAGING

CORONAL MEDIC SEQUENCE USED IN SHOULDER