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MDS Time of Flight Angiography
Time of Flight MR-Angiography (TOF MRA) provides vessel imaging without the application of contrast agents. Thereby the static tissue signal in the acquisition slice is suppressed by high flip angles and short repetition times (TR) of the pulse sequence. The blood flow carries unsaturated spins from the outside into the acquisition slice which results in a blood tissue contrast caused by inflow enhancement. The described TOF technique is combined with a data acquisition during continuous motion of the patient table (Move During Scan, MDS).
Imaging the Veins
Data acquisition during continuous patient motion results in a permanent change of the acquired volume at the same physical scanner position. For this reason the usually used chemical shift selective fat saturation does not work with MDS. Therefore a difference method was used to achieve the cancellation of the fat signal (Fig. 1). The extended FOV was acquired twice, saturating either the signal of arteries only or of both, arteries and veins. Finally the signal magnitudes of corresponding slices were subtracted voxel by voxel. Application of a maximum intensity projection (MIP) on the subtracted volume data set results in a venogram (Fig. 2).
Fig. 1:
Difference method for TOF-Venography
Fig. 2:
Maximum Intensity Projection (MIP) of a difference TOF-Venogram
acquired with a continuously moving table during data acquisition
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