Method and apparatus for the acquisition of data for magnetic resonance imaging
First Claim
1. A method for the acquisition of data for an image representation showing the spatial distribution of the magnetic resonance behavior of an object within a selected localized region comprising the steps of:
- arranging the object in a stationary magnetic field;
exposing the object to a succession of high frequency pulses and pulses of magnetic field gradients in different spatial directions in such manner that a succession of magnetic resonance signals appears wherein said succession of high frequency pulses and pulses of magnetic field gradients comprises at least two different sequences of high frequency pulses and magnetic field gradient pulses which differ in at least one of the features of the signal production responsible for different aspects of the image quality and wherein these sequences are carried out after one another in time;
reading said magnetic resonance signals by scanning under the influence of respective read gradients and using said signals as data sets for the filling a K-space, and, entering the magnetic resonance signals read out for different sequences into different bands of the K-space.
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Abstract
In order to acquire data for an image representation which shows the spatial distribution of the magnetic resonance behavior of an object within a selected localized region, the relevant localized region is arranged in a stationary magnetic field and is subjected to a sequence of high frequency pulses and pulses of magnetic field gradients in different spatial directions, such that a succession of magnetic resonance signals appears. These signals are read out by scanning under the influence of a read gradient and are used as sets of data for the filling of the K-space. In accordance with the invention, at least two different sequences of high frequency pulses and magnetic field gradient pulses are used, which differ in at least one of the features of the signal creation responsible for different aspects of the image quality. These sequences are executed one after another in time, with the magnetic resonance signals read out for the different sequences being collated in different bands of the K-space.
69 Citations
18 Claims
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1. A method for the acquisition of data for an image representation showing the spatial distribution of the magnetic resonance behavior of an object within a selected localized region comprising the steps of:
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arranging the object in a stationary magnetic field;
exposing the object to a succession of high frequency pulses and pulses of magnetic field gradients in different spatial directions in such manner that a succession of magnetic resonance signals appears wherein said succession of high frequency pulses and pulses of magnetic field gradients comprises at least two different sequences of high frequency pulses and magnetic field gradient pulses which differ in at least one of the features of the signal production responsible for different aspects of the image quality and wherein these sequences are carried out after one another in time;
reading said magnetic resonance signals by scanning under the influence of respective read gradients and using said signals as data sets for the filling a K-space, and, entering the magnetic resonance signals read out for different sequences into different bands of the K-space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Apparatus for the acquisition of data for an image representation which shows the spatial distribution of magnetic resonance behavior of an object within a selected localised region, comprising
means (11, 21) for producing a homogeneous magnetic field in the object region to be investigated, which directs the spin in the field direction, means (15, 23) for producing high frequency pulses which act on the object region, means (12, 13, 14, 22) for producing magnetic field gradients in different spatial directions, means (40, 50) for reading out the magnetic resonance echo signals arising from the object region in respnse to the high frequency pulses and magnetic field gradients and writing these echo signals into the K-space, and a control means (30) for controlling the means producing the high frequency pulses and the means producing the magnetic field gradients and the readout means such that the object region is subjected to a succession of at least two different sequences of high frequency pulses and magnetic field gradient pulses in order to produce different sequences of magnetic resonance echo signals which differ in at least one of the features of the echo production which are responsible for different aspects of image quality, and that the echo signals of the different sequences are written into respective different bands of the K-space.
Specification