The area of the body which we are interested in imaging is placed in the center of the magnetic field.
If your MRI is of the leg (hip/knee/ankle foot), you will enter the scanner feet first and your head will be out. MRIs of the Abdomen and Pelvis also allow for patients to be positioned with the feet entering the scanner first (your head may or may not be out).
If your MRI is of the arm (shoulder, elbow, wrist, hand), you will enter the scanner head first. MRIs of the Brain and Spine also require you enter head first.