摘要:
An MR method and apparatus determines spatially resolved relaxation parameters of a subject in an examination zone, voxel by voxel. A first MR scan sequence is applied to generate a series of first MR data sets having different echo times. A second MR scan sequence is applied to generate at least one further MR data set having an enhanced spatial resolution and reduced time resolution in comparison with the first MR data sets from the first sequence. MR combination images are generated using the first MR data sets derived from the first sequence for a portion within the k-space and the further MR data set acquired outside this portion by the second sequence. The relaxation parameters are determined from the MR combination images.
摘要:
The invention relates to an MR method of determining local relaxation time values (T1, T2) of an examination object (5). Firstly, two or more MR images (3, 4) of the examination object (5) are recorded, each with different time parameter sets (TR1, TE1, TR2, TE2) of an imaging sequence. MR images (6, 7) of a phantom are likewise recorded, wherein the same time parameter sets (TR1, TE1, TR2, TE2) of the imaging sequence are used and wherein the phantom has a known spatial distribution of relaxation time values (T1, T2). The local relaxation time values (T1, T2) of the examination object (5) are determined by comparing image values of the MR images (3, 4) of the examination object (5) with image values of the MR images (6, 7) of the phantom and by assigning image values of the MR images of the phantom to relaxation time values (T1, T2) according to the known spatial distribution of relaxation time values (T1, T2) of the phantom.
摘要:
A medical imaging method includes energy-resolving x-ray projection data indicative of a contrast labeled scaffold seeded with biological cells for growing tissue and reconstructing the energy-resolved projection data to generate energy-resolved image data indicative of the contrast labeled scaffold.
摘要:
MR based molecular imaging is strongly supported by the accurate quantification of contrast agents. According to an exemplary embodiment of the present invention, a determination unit of an examination apparatus is adapted for determining an error propagation function, wherein the error propagation function is then used as a weighting function for an accurate determination Of AR2*. This leads to an improved examination result.
摘要:
MR based molecular imaging is strongly supported by the accurate quantification of contrast agents. According to an exemplary embodiment of the present invention, a determination unit of an examination apparatus is adapted for determining an error propagation function, wherein the error propagation function is then used as a weighting function for an accurate determination Of AR2*. This leads to an improved examination result.
摘要:
An MR method determines local relaxation time values (T1, T2) of an examination object (5). First, two or more MR images (3, 4) of the examination object (5) are recorded, each with different time parameter sets (TR1, TE1, TR2, TE2) of an imaging sequence. MR images (6, 7) of a phantom are likewise recorded using the same time parameter sets (TR1, TE1, TR2, TE2) of the imaging sequence. The phantom has a known spatial distribution of relaxation time values (T1, T2). The local relaxation time values (T1, T2) of the examination object (5) are determined by comparing image values of the MR images (3, 4) of the examination object (5) with image values of the MR images (6, 7) of the phantom and by assigning image values of the MR images (6, 7) of the phantom to relaxation time values (T1, T2) according to the known spatial distribution of relaxation time values (T1, T2) of the phantom.
摘要:
The invention relates to an MR method for spatially resolved determination of relaxation parameters in an examination zone, comprising the steps: a. acquisition, by means of a first sequence, of MR data sets for a plurality of MR images having different echo times, b. acquisition, by means of a second sequence, of at least one further MR data set for at least one further MR image having an enhanced spatial resolution and reduced time resolution in comparison with the MR images of the first sequence, c. generation of MR combination images using an MR data set derived from the first sequence for a portion within the k-space and the MR data of a further MR data set acquired outside this portion by means of the second sequence, d. derivation of relaxation parameters from the MR combination images.