| 摘要 |
<p>In an MR imaging system provided with a main magnet (10) having a bore (12) and with a gradient coil assembly (18) located within the bore (12), RF coil apparatus is provided for reducing noise in the imaging volume (24) of the MR system. The RF coil apparatus comprises a tubular RF coil form (34) provided with an inner surface(34a), an RF coil (30) attached to the inner surface of the RF coil form (34), and mounting structure (32,36a,36b) extending between the RF coil form (34) and gradient coil assembly (18). The mounting structure supports the RF coil (30) and RF coil form (34) upon the gradient coil assembly (18), in spaced-apart relationship therewith. The apparatus further compises an inner tubular member (22) which is selectively constructed to oppose transmission of acoustic signals from the RF coil (30) to the imaging volume (24). The inner tubular member (22) is fixably supported within the main magnet bore (12) so as to be in selected spaced-apart relationship with the RF coil (30) and RF coil form (34), the inner tubular member (22) substantially enclosing a specified portion of the volume of the bore, which comprises the MR system imaging volume (24). <IMAGE></p> |
