| 摘要 |
<p>An RF shield for NMR opaque to RF energy but that permits audio frequency signals such as those of a gradient coil to penetrate an examination region. The surface of the shield is made up of an outside conductive layer (43) which is divided by etched channels (28). The etched channels (28), define circumferential strip-shaped areas (30) at the edges of the cylinder walls and longitudinal strip-shaped areas (32) at the central portion of the cylinder walls. Transition regions (31) are provided where the longitudinal and circumferential areas meet. An ancillary conductor is connected to the RF shield. The conductor acts as a high-pass coupling.</p> |
