A system for multi-slice magnetic resonance imaging (MM) comprises a gradient coil array comprising a plurality of independent coils distributed about an enclosure; and a controller configured to concurrently actuate said plurality of coils so as to generate a spatially-varying magnetic field within said enclosure such that for at least first and second volumetric slices, a magnetic field magnitude associated with at least one location in the first volumetric slice is substantially equal to a magnetic field magnitude associated with a respective location in the second volumetric slice.

While the size of a coil is maintained, the performance of the coil is improved. A method for designing a gradient coil includes the step of determining performance value evaluation points between a plurality of coils disposed so as to face each other, and determining a stream function on the basis of the performance value evaluation points and the target field method so as to decrease the value of a polynomial evaluation function containing a term of a simple sum of sizes of current density distribution in coil planes; and the step of disposing a continuous current pathway in the coil planes on the basis of contours of the determined stream function.

While the size of a coil is maintained, the performance of the coil is improved. A method for designing a gradient coil includes the step of determining performance value evaluation points between a plurality of coils disposed so as to face each other, and determining a stream function on the basis of the performance value evaluation points and the target field method so as to decrease the value of a polynomial evaluation function containing a term of a simple sum of sizes of current density distribution in coil planes; and the step of disposing a continuous current pathway in the coil planes on the basis of contours of the determined stream function.

A magnetic resonance imaging device having a field generation unit configured to provide a magnetic field in an imaging volume of the magnetic resonance imaging device. The field generation unit has at least one magnet. A surface of the field generation unit directed towards the imaging volume of the at least one magnet has a concave shape, wherein a direction of access to the imaging volume is oriented essentially perpendicular to a main direction of magnetic field lines in the imaging volume.

A magnetic resonance imaging device having a field generation unit configured to provide a magnetic field in an imaging volume of the magnetic resonance imaging device. The field generation unit has at least one magnet. A surface of the field generation unit directed towards the imaging volume of the at least one magnet has a concave shape, wherein a direction of access to the imaging volume is oriented essentially perpendicular to a main direction of magnetic field lines in the imaging volume.

Described here are systems and methods for mitigating or otherwise removing the effects of short-term magnetic field instabilities caused by oscillations of the cold head in a cryogen-free magnet system used for magnetic resonance systems, such as magnetic resonance imaging (“MRI”) systems, nuclear magnetic resonance (“NMR”) systems, or the like.

A method for generating an MRI sequence (1) which is characterized in that a first time segment type and a second time segment type differing therefrom are predefined and the MRI sequence (1) is constructed by time segments (5, 6) of the first time segment type and time segments (5, 6) of the second time segment type being strung together alternately.

A method for generating an MRI sequence (1) which is characterized in that a first time segment type and a second time segment type differing therefrom are predefined and the MRI sequence (1) is constructed by time segments (5, 6) of the first time segment type and time segments (5, 6) of the second time segment type being strung together alternately.

The present disclosure provides a system. The system may include a medical device, a couch, one or more imaging devices, and a control device. The medical device may include a cavity. The couch may be configured to support a subject. The one or more imaging devices may be configured to acquire image data. The image data may indicate at least one of a target portion of the subject or posture information of a user. The control device may be configured to control a movement of the couch based on at least one of position information of the target portion of the subject or the posture information of the user.

The present disclosure provides a system. The system may include a medical device, a couch, one or more imaging devices, and a control device. The medical device may include a cavity. The couch may be configured to support a subject. The one or more imaging devices may be configured to acquire image data. The image data may indicate at least one of a target portion of the subject or posture information of a user. The control device may be configured to control a movement of the couch based on at least one of position information of the target portion of the subject or the posture information of the user.