Magnetic resonance examination apparatus and antenna device

摘要

There is provided a technique for securing a comfortable examination space in a tunnel type MRI apparatus without increasing the manufacturing cost of the MRI apparatus and sacrificing performance thereof. In an RF coil provided with a hollow-shaped outer conductive element and a strip-shaped conductive element disposed along the outer conductive element in the axial direction, meander lines constituting the strip-shaped conductive element are disposed at uneven distances from the outer conductive element to secure an internal space. In order to obtain uniform sensitivity at the center of the RF coil, the strip-shaped conductive element is constituted with N of connected meander lines, and length of the strip-shaped conductive element is adjusted so that, in the strip-shaped conductive element resonating at resonance frequency of the antenna, nodes are formed in a number of (M+1)×N−1, wherein M is 0 or a natural number of 1 or larger.

主权项

1. A magnetic resonance examination apparatus, which comprises an antenna device used for at least one of transmission and reception of a signal and comprising:
a hollow cylindrical conductive element, and at least two of conductive elements disposed at a certain distance from internal surface of the cylindrical conductive element substantially in parallel with the center axis of the cylindrical conductive element and having a meandering portion between both ends, wherein each of the conductive elements has a feed point.