A dielectric element for positioning on an examination subject for locally influencing the B1 field distribution during magnetic resonance data acquisition contains a relaxation agent bound to mutually separated particles. In particular, the alignment marks 12a, 12b, 12c and 12d are formed on the flat plane 11a, thereby image recognition is given to exactly detect positions of the alignment marks 12a, 12b, 12c and 12d, thus making it possible to make exact alignment. When the IP packet includes the desired contents, such contents are delivered to a TV apparatus via IEEE1394 network. The through hole of the bushing is defined axially through the bushing and is mounted around the first end.