Abstract: The invention provides for a medical instrument (200, 300, 400, 500, 502, 600, 700, 702, 800, 802) comprising a LINAC guided by a magnetic resonance imaging system (204). Execution of the instructions by processor to controlling the medical instrument cause the processor to: receive (100) a treatment plan (260) for irradiating the target zone; modify (102) the treatment plan in accordance with an X-ray transmission model of an accessory; acquire (104) magnetic resonance data using the magnetic resonance imaging system; reconstruct (106) a magnetic resonance image (268) from the magnetic resonance data; register (108) a location (272) of the target zone in the magnetic resonance image; generate (110) control signals (274) in accordance with the location of the target zone and the X-ray transmission model; and control (112) the LINAC to irradiate the target zone using the control signals.

Abstract: The invention provides for a medical instrument (200, 300, 400, 500, 502, 600, 700, 702, 800, 802) comprising a LINAC guided by a magnetic resonance imaging system (204). Execution of the instructions by processor to controlling the medical instrument cause the processor to: receive (100) a treatment plan (260) for irradiating the target zone; modify (102) the treatment plan in accordance with an X-ray transmission model of an accessory; acquire (104) magnetic resonance data using the magnetic resonance imaging system; reconstruct (106) a magnetic resonance image (268) from the magnetic resonance data; register (108) a location (272) of the target zone in the magnetic resonance image; generate (110) control signals (274) in accordance with the location of the target zone and the X-ray transmission model; and control (112) the LINAC to irradiate the target zone using the control signals.

Abstract: The present invention relates to an RF system for a magnetic resonance imaging device (13). The RF system comprises an RF transmitter coil subsystem and an RF receiver coil subsystem (18), wherein the RF receiver coil subsystem comprises at least one first coil-like element (19) and at least one second coil-like element (20), wherein the or each first coil-like element is assigned to a main magnet system (15) of the magnetic resonance imaging device, and wherein the or each second coil-like element is assigned to an object (14) to be analyzed by the magnetic resonance imaging device.

Abstract: A magnetic resonance imaging system comprises a signal acquisition system to acquire magnetic resonance signals. A reconstructor reconstructs magnetic resonance images from the acquired magnetic resonance signals. The signal acquisition system and/or the reconstructor are controlled to perform overhead activities separately from actual acquisition of the magnetic resonance signals notably for different contrast types. Accordingly, time efficient signal acquisition for multiple contrasts is achieved.

Abstract: The present invention relates to an RF system for a magnetic resonance imaging device (13). The RF system comprises an RF transmitter coil subsystem and an RF receiver coil subsystem (18), wherein the RF receiver coil subsystem comprises at least one first coil-like element (19) and at least one second coil-like element (20), wherein the or each first coil-like element is assigned to a main magnet system (15) of the magnetic resonance imaging device, and wherein the or each second coil-like element is assigned to an object (14) to be analyzed by the magnetic resonance imaging device.

Abstract: In a magnetic resonance imaging method magnetic resonance signal samples are received for a predetermined field of view by a receiving antenna having a spatial sensitivity profile. The sampling in the k space corresponds to the predetermined field of view in the geometrical space. Folded-over images having folded-over pixel values are reconstructed from the sampled magnetic resonance signals. Pixel contributions for spatial positions within the predetermined field of view are calculated from the folded-over pixel values and the spatial sensitivity profile of the receiver antenna. The magnetic resonance image is formed from the pixel contributions for spatial positions within the predetermined field of view. Thus, aliasing or fold-over artefacts caused by a field of view that is too small are avoided.

Abstract: The degree of sub-sampling in magnetic resonance imaging is such that the ensuing acquisition time for receiving (echo) series of magnetic resonance signals due to an individual RF excitation is shorter than the decay time of such magnetic resonance signals. Preferably, a segmented scan of the k space is performed, the number of segments and the number of lines scanned in each segment being adjustable and a predetermined total number of lines being scanned. Preferably, a small number of segments is used such that the acquisition time for receiving the magnetic resonance signals for the complete magnetic resonance image is shorter than the process time of the dynamic process involved.

Abstract: A magnetic resonance imaging method is provided in which the magnetic resonance signals are acquired by sampling a selected region in the k-space. The selected region in the k-space is chosen in dependence on the object or structure to be imaged. In particular an anisotropic central sector in the k-space is chosen, its axis being dependent on the spatial orientation of the object or structure to be imaged. The magnetic resonance imaging method in accordance with the invention is particularly suitable for imaging arteries separately from veins in magnetic resonance angiography.

Abstract: The degree of sub-sampling in magnetic resonance imaging is such that the ensuing acquisition time for receiving (echo) series of magnetic resonance signals due to an individual RF excitation is shorter than the decay time of such magnetic resonance signals. Preferably, a segmented scan of the k space is performed, the number of segments and the number of lines scanned in each segment being adjustable and a predetermined total number of lines being scanned. Preferably, a small number of segments is used such that the acquisition time for receiving the magnetic resonance signals for the complete magnetic resonance image is shorter than the process time of the dynamic process involved.

Abstract: The degree of sub-sampling in magnetic resonance imaging is such that the ensuing acquisition time for receiving (echo) series of magnetic resonance signals due to an individual RF excitation is shorter than the decay time of such magnetic resonance signals. Preferably, a segmented scan of the k space is performed, the number of segments and the number of lines scanned in each segment being adjustable and a predetermined total number of lines being scanned. Preferably, a small number of segments is used such that the acquisition time for receiving the magnetic resonance signals for the complete magnetic resonance image is shorter than the process time of the dynamic process involved.

Abstract: A magnetic resonance imaging method is proposed wherein the MR signal acquisition is performed by separate scanning of central (40) and peripheral (70) sectors. Central and peripheral sectors are selected in an individual plane in the k-space and optionally an intermediate sector (50) between the peripheral and central sectors is also selected. The center (O) in the k-space in the individual plane at issue is situated within the central sector. The scanning of the k-space commences outside the center of the k-space and before or during increasing contrast. Preferably, the scanning is timed such that the center of the k-space is reached at maximum contrast (MR angiography) or at the value zero of the longitudinal magnetization (MR inversion recovery). The central sector is advantageously scanned in a stochastic order. The peripheral sector may be scanned along a spiral-shaped trajectory, radial trajectories or along high-low ordered lines.

Abstract: A magnetic resonance imaging method involves acquisition of sets of magnetic resonance signals from several scan-volumes of an object. According to the invention different spatial approaches are taken in the scanning of the respective scan-volumes. In particular_respective scan-volumes include different numbers of scan-slices or scan slices of respective scan-volumes have different slice-thickness or scan-slices of respective scan-volumes have different fields-of-view or scan-slices of respective scan-volumes have different numbers of scanned points in k-space.

Abstract: A magnetic resonance imaging method is provided in which the magnetic resonance signals are acquired by sampling a selected region in the k-space. The selected region in the k-space is chosen in dependence on the object or structure to be imaged. In particular an anisotropic central sector in the k-space is chosen, its axis being dependent on the spatial orientation of the object or structure to be imaged. The magnetic resonance imaging method in accordance with the invention is particularly suitable for imaging arteries separately from veins in magnetic resonance angiography.

Abstract: A magnetic resonance imaging method is proposed wherein the MR signal acquisition is performed by separate scanning of central (40) and peripheral (70) sectors. Central and peripheral sectors are selected in an individual plane in the k-space and optionally an intermediate sector (50) between the peripheral and central sectors is also selected. The center (O) in the k-space in the individual plane at issue is situated within the central sector. The scanning of the k-space commences outside the center of the k-space and before or during increasing contrast. Preferably, the scanning is timed such that the center of the k-space is reached at maximum contrast (MR angiography) or at the value zero of the longitudinal magnetization (MR inversion recovery). The central sector is advantageously scanned in a stochastic order. The peripheral sector may be scanned along a spiral-shaped trajectory, radial trajectories or along high-low ordered lines.