Patent Document ID: 5510710
Application ID: 08351661
Patent Status: 1

Claim One:
1. A magnetic resonance method for imaging an object comprising the steps of: a) locating the object in a homogeneous base magnetic field; b) acquiring, using a back projection method n&gt;&gt;1 different projections with different directions .phi.(i) by carrying out the following steps ba) to bd) n times with i=1 to n: ba) applying a gradient magnetic field G.phi.(i) having a predetermined direction .phi.(i), different for every i, and a strength G(i) for acquiring a projection p(i); bb) irradiating a high frequency excitation pulse into the object; bc) waiting a time t.sub.w '; bd) measuring, at a predetermined sampling rate, (j-m) &gt;&gt;1 measuring points S.sub.m+1 (i) to S.sub.j (i), which are sequential in time, of a nuclear resonance signal from the object, the signal dephasing under the influence of the gradient magnetic field G.phi.(i), the measuring points S.sub.m+1 (i) to S.sub.j (i) corresponding to j-m points in k-space lying along a vector extending from a k-space origin in the direction .phi.(i) of the gradient magnetic field G.phi.(i), whereby the separation of each of the j-m points S.sub.m+1 (i) to S.sub.j (i) in k-space from the k-space origin is given by a product of the strength G(i) of the gradient magnetic field G.phi.(i) and a time interval between the high frequency excitation pulse and the sampling time of the corresponding measuring points.sub.m+1 (i) to S.sub.j (i); c) acquiring, using a single point imaging method (S by PI), n'.ltoreq.n*m additional measuring points S(i') by carrying out the following steps ca) to cd) n' times with i'=1 to n': ca) applying a gradient magnetic field G.phi.(i') having a predetermined direction .phi.(i') and a strength G(i') for acquiring only one measuring point S(i'); cb) irrdiating the high frequency excitation pulse into the object; cc) waiting time t.sub.w '; cd) measuring only one measuring point S(i') of a nuclear resonance signal from the object, the signal dephasing under the influence of the gradient magnetic field G.phi.(i'), the measuring point S(i') corresponding to a point in k-space lying along a vector extending from a k-space origin in the direction .phi.(i') of the gradient magnetic field G.phi.(i'), whereby the separation of the point S(i') in k-space from the k-space origin is given by a product of the strength G(i') of the gradient magnetic field G.phi.(i') and the time t.sub.w '; d) reconstructing an image of the object from a total number of n*(j-m) measuring points S.sub.m+1 (i) to S.sub.j (i) plus n' measuring points S(i') in k-space.