Patent application number | Description | Published |
20090079427 | MULTIPLY PHASE-CYCLED STEADY STATE FREE PRECESSION SEQUENCE AND MAGNETIC RESONANCE APPARATUS FOR IMPLEMENTATION THEREOF - A multiply phase-cycled steady state free precession sequence has at least two sub-sequences with alternating radio-frequency excitation pulses. An intermediate image data set is generated from raw data that are acquired with each sub-sequence. A resulting image data set is formed from the intermediate image data sets. Radio-frequency excitation pulses for different sub-sequences have supplementary phases differing from one another, such that successive radio-frequency excitation pulses cannot lead to a non-alternating excitation in any sub-sequence. A magnetic resonance apparatus has a corresponding apparatus controller that implements the sequence. | 03-26-2009 |
20100090696 | METHOD, PROCESSOR, AND MAGNETIC RESONANCE APPARATUS FOR SELECTIVE PRESENTATION OF LUNG MOVEMENT - In a method for selective presentation of a movement of the lung, magnetic resonance images (MR images) of the lung are acquired in a temporal progression, i.e. MR images of the lung are acquired over multiple breathing cycles. The acquired MR images are registered with regard to a reference position and the signal curve over time is determined in the acquired MR images. The frequency spectrum of the determined signal curves is then determined, such as by a Fourier transformation. A specific frequency spectrum is filtered with a frequency band filter, wherein the frequency range of the frequency band filter is adapted to the movement to be shown. The filtered frequency spectrum is transformed back into a filtered signal curve of the MR images, and the magnetic resonance images obtained via this back-transformation are displayed in the temporal progression with the filtered signal curve. A computer readable medium, an image processing unit and a magnetic resonance apparatus implement such a method. | 04-15-2010 |
20100160767 | METHOD FOR CONTRAST-AGENT-FREE ANGIOGRAPHIC IMAGING IN MAGNETIC RESONANCE TOMOGRAPHY - A method for contrast-agent-free non-triggered angiographic imaging in magnetic resonance tomography that includes the steps of (S | 06-24-2010 |
20100244832 | MAGNETIC RESONANCE APPARATUS AND METHOD FOR IMPLEMENTING A NEUROLOGICAL SEQUENCE PROTOCOL - In a method and apparatus to generate MR images of an examination region containing tissue with a first T2 time and tissue with a second, significantly longer T2 time are contained, as series of pulse sequences is employed the following pulse sequences: an overview pulse sequence to generate MR overview images, a T1-weighted pulse sequence to generate T1-weighted MR images and a multiple contrast pulse sequence in which at least two groups of magnetic resonance signals are acquired. A first group of magnetic resonance signals is acquired after excitation of a magnetization in a first time period and at least one second group of magnetic resonance signals is acquired in a second time period after the first time period in which the tissue with the significantly longer T2 time delivers the significant signal contribution. An MR image is calculated based on a pixel-by-pixel difference of the absolute values from the magnetic resonance signals of the first group and the second group. | 09-30-2010 |
20100271023 | METHOD FOR IMAGING IN MAGNETIC RESONANCE TOMOGRAPHY WITH SPECTRAL FAT SATURATION OR SPECTRAL WATER EXCITATION - A magnetic resonance tomography (MRT) method with spectral fat saturation or spectral water excitation in a tissue region that is to be represented of a patient who is to be examined, includes the following steps: (Step 1) frequency adjustment measurement of a region of a patient that is to be represented with a selected first partial coil of the MRT system, (Step 2) precise determination of the resonance frequency of water with the aid of the spectrum obtained in Step 1 exhibiting the resonance frequencies of fat and water, (Step 3) repetition of Steps 1 and 2 with at least one additionally selected second partial coil of the MRT system adjacent to the first partial coil, (Step 4) measuring of a k space data record with a partial coil or a partial coil combination on the basis of the water resonance frequency assigned to these partial coils, (Step 5) repetition of Step 4 with other partial coils or other partial coil combinations until the entire tissue region to be represented has been measured, (Step 6) combining of the measuring results obtained in Steps 4 and 5, and (Step 7) representing of the results obtained in Step 6 in the image space in the form of an overall image of the tissue region to be represented. | 10-28-2010 |
20110031971 | CONTRAST AGENT-FREE MR ANGIOGRAPHY WITH SSFP SEQUENCES - In a method to generate an MR angiography image of an examination region of a subject without the use of contrast agent, a first MR image of the examination region is acquired with a first imaging sequence in which a gradient-induced phase development for unmoved and moved spins is essentially completely rephased at the end of a repetition interval TR, and a second MR image of the examination region is acquired with a second imaging sequence in which the gradient-induced phase development for unmoved spins is likewise essentially completely rephased at the end of the repetition interval TR and a rest phase φ | 02-10-2011 |
20110215804 | MAGNETIC RESONANCE METHOD AND SYSTEM TO CREATE AN IMAGE DATA SET - In a method to create an image data set by operating a magnetic resonance system, at least two phase coding gradients are switched in respective spatial directions, an RF excitation pulse is radiated and a raw data point in a k-space data set belonging to the image data set is read out a predetermined time period after the radiation of the RF excitation pulse. The predetermined time period thereby corresponds to the maximum of a set of a respective minimum time period for each of the at least two phase coding gradients. The minimum time period of the respective at least one of the at least two phase coding gradients is determined depending on the strength of the respective phase coding gradient such that the Nyquist theorem is complied with. | 09-08-2011 |
20110249874 | EVALUATION METHOD FOR A SERIES OF IMAGE DATA SETS WITH TWO-FOLD ELASTIC DISTORTION OF THE IMAGE DATA SETS - A series of image data sets of a region of an organism is acquired while the acquired region of the organism moves dependent on breathing and heartbeat, and supplied to a processor. The processor determines a first contour that moves depending on the breathing in the acquired image data sets. The acquired image data sets are distorted elastically in the processor into singly distorted image data sets such that the first contours of the singly distorted image data sets spatially correspond with one another. A second contour is determined in the processor in the acquired image data sets or in the singly distorted image data sets, this second contour moves depending on the heartbeat. The singly distorted image data sets are distorted elastically into doubly distorted image data sets such that the second contours of the doubly distorted image data sets spatially correspond with one another. Regions of the doubly distorted image data sets that spatially correspond to one another are evaluated in the processor across image data sets. | 10-13-2011 |
20120081112 | MAGNETIC RESONANCE IMAGING METHOD, SYSTEM AND COMPUTER-READABLE STORAGE MEDIUM - In a magnetic resonance method and system to acquire an MR image using a pulse sequence that sets the magnetization vector in the steady state into a stable oscillation under RF excitation pulses radiated at a time interval of time TR, the phase coding gradients for coding a k-space line in k-space of the pulse sequence (which k-space corresponds to the desired MR image) are switched such that the first moment of the phase coding gradient is minimal at the point in time of the radiation of an RF excitation pulse without the repetition time TR being extended relative to pulse sequences with unminimized phase coding gradients. | 04-05-2012 |