Koninklijke Philips Corporation N.v.

Gerardus B J Mulder

Gordon D DeMeester

Michael Andrew Morich

Paul Royston Harvey

Dennis K Everett

Robert Paul Kleihorst

Ronald Bryan Sharpless

Gerardus Nerius Peeren

Jan Konijn

Robert G Henderson

Cornelis L G Ham

William Amor

John V M McGinley

Paulus C H A Haans

Terrence M Doyle

Marinus L A Vrinten

Jerome S Alden

Ronald B Sharpless

William H Amor

A magnetic resonance imaging scanner includes a generally cylindrical main magnet assembly () that defines a cylinder axis (). A first set of shims () are rigidly positioned inside the magnet assembly () at about a first distance (d) relative to the cylinder axis (). A second set of shims () are rigidly positioned inside the main magnet assembly () at about a second distance (d) relative to the cylinder axis (). The second distance (d) is different from the first distance (d). A generally cylindrical radio frequency coil () is arranged inside the main magnet assembly () at about a third distance (d) relative to the cylinder axis (). A plurality of gradient coils () are arranged inside the main magnet assembly () at about a fourth distance (d) relative to the cylinder axis ().

Magnetic resonance imaging scanner with molded fixed shims

The invention relates to a treatment room () suitable for recording images of a human or animal body on the basis of a magnetic resonance (MR) imaging technique, the walls (), the ceiling () and the floor () of the treatment room forming an electromagnetic shield for a magnetic resonance (MR) imaging system () arranged in the treatment room, which MR imaging system comprises at least a target area () in which a human or animal body can be placed, a housing () comprising at least one main magnetic unit and at least one gradient magnetic unit for generating one or more magnetic fields in the target area (), and at least one radio-frequency (RF) pulse unit () for generating an electromagnetic RF pulse in the target area (). The invention further relates to a magnetic resonance imaging system comprising a target area in which a human or animal body can be placed, a housing comprising at least one main magnetic unit and at least one gradient magnetic unit for generating one or more magnetic fields in the target area, and at least one radio-frequency (RF) pulse unit for generating an electromagnetic RF pulse in the target area. In accordance with the invention, means () are present which, in operation, counteract the electromagnetic effects () of the RF pulse in the treatment room () outside the target area ().

Shielded treatment room and device suitable for recording images on the basis of magnetic resonance

In a method for aligning a magnetic field-modifying structure ( ) in a magnet bore ( ) of a magnetic resonance imaging scanner ( ), a reference magnetic field map of the magnet bore ( ) is measured without the magnetic field-modifying structure ( ) inserted. The magnetic field-modifying structure ( ) is inserted into the magnet bore ( ). A second magnetic field map of the magnetic bore ( ) is measured with the magnetic field-modifying structure ( ) inserted. At least one odd harmonic component of the first and second magnetic field maps is extracted. The magnetic field-modifying structure ( ) is aligned in the magnet bore ( ) based on a comparison of the odd harmonic component of the first and second magnetic field maps.

Method and apparatus for aligning a magnetic field modifying structure in a magnetic resonance imaging scanner

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Best, Netherlands

Gerardus B J Mulder