Patent ID: 7759936

Claim:
An RF coil comprising: a first loop coil element including a first plane closed by a first coil line; and a second loop coil element including a second plane closed by a second coil line, wherein at least a portion of said first plane and at least a portion of said second plane face each other, such that said first loop coil element and said second loop coil element are each configured to move while maintaining a facing state as to vary a square measure of a facing area in which said first coil plane and said second coil plane face each other, said first loop coil element comprising: a first spreading part having a first coil line disposed such that a distance of opposing by said first coil line parallel to a first moving direction widens in said first moving direction, in a direction normal to said first moving direction in which the movement so takes place that the square measure of said facing area increases relative to said second loop coil element in a direction parallel to said first plane; and a first coil crossing part in which a first coil line is so disposed as to cross a second spreading part in an arrangement in which said first loop coil element and said second loop coil element are electromagnetically decoupled and the square measure of said facing area is at a minimum thereof, said second loop coil element comprising: a second spreading part having a second coil line disposed such that a distance of opposing by said second coil line parallel to a second moving direction widens in said second moving direction, in a direction normal to said second moving direction in which the movement so takes place that the square measure of said facing area increases relative to said first loop coil element in a direction parallel to said second plane; and a second coil crossing part in which a second coil line is disposed as to cross said first spreading part in said arrangement, wherein said first loop coil element and said second loop coil element are formed such that, when in said arrangement said facing area has been separated into a first facing area and a second facing area by a line linking a point at which said first spreading part and said second coil crossing part cross each other and a point at which said second spreading part and said first coil crossing part cross each other, the square measure of said second facing area decreases as movement takes place to increase the square measure of said first facing area.