Patent ID: 8089280

Claim:
An RF coil having a cylindrical shape, wherein a static magnetic field is applied in effectively the same direction as direction of the central axis of the cylindrical shape, comprising: plural double-tuned circuits disposed circumferentially in at least one cross-section effectively orthogonal to the direction of the static magnetic field for the purpose of resonating with a first resonance frequency and a second resonance frequency; a first feeding port which feeds a first resonance frequency signal; and a second feeding port which feeds a second resonance frequency signal; wherein the second feeding port is disposed at a position 90° in the counterclockwise direction with respect to the center of the cylindrical shape from the first feeding port in a cross-section viewed from a direction passing through the static magnetic field; and wherein the plural double-tuned circuits comprise: plural first double-tuned circuits, wherein for each of the plural first double-tuned circuits, when the first resonance frequency is higher than the second resonance frequency, the first capacity of the first double-tuned circuit at the first resonance frequency shows a smaller value than the second capacity of the first double-tuned circuit at the second resonance frequency; and a second double-tuned circuit disposed at a position 22.5° to 67.5° or 202.5° to 247.5° in the clockwise direction with respect to the center of the cylindrical shape from the first feeding port in a cross-section viewed in a direction passing through the static magnetic field, and showing a smaller capacity than the first capacity of the first double-tuned circuit at the first resonance frequency and showing a larger capacity than the second capacity of the first double-tuned circuit at the second resonance frequency.