TECHNIQUE FOR OBTAINING A BLACKBLOOD IMAGE OF HAERT USING A SATURATION RADIOFREQUENCY (RF) PULSE
Publication Date: 2016-Jul-01
The IP.com Prior Art Database
A technique for obtaining a black blood image of the heart is proposed. The technique uses a saturation radiofrequency (RF) pulse scheme to suppress blood signal to obtain the black blood image. Reduced preparation time according to the technique described herein, allows more phases in the cardiac cycle to be acquired. Therefore, by using the RF saturation pulse, a cine black blood sequence covering the full cardiac cycle is obtained.
The present disclosure relates generally to magnetic resonance imaging (MRI) of the heart and more particularly to a technique for obtaining a black blood image of the heart using saturation radiofrequency (RF) pulse.
Generally, a current black blood sequence is used to study the morphology of a heart and to detect edema. Conventionally, the sequence of choice is a fast spin echo for high spatial resolution images. In many instances, the fast spin echo sequence is performed for one slice in the heart in a single breath-hold.
For greater coverage, sometimes a single shot fast spin echo sequence with double inversion recovery (DIR) preparation module is used. As depicted in Figure 1, the DIR preparation module consists of a non-selective 180 degree pulse, which inverts the magnetization, followed by a slice selective 180 degree pulse, which re-inverts spins in a single slice.
As the DIR preparation module technique involves a single shot, more slices per breath-hold are acquired. However, conventional techniques for black blood preparation are time consuming because the conventional techniques allow some time for TI null point, which can range between 400 ms and 700 ms depending upon heart rate.
It would be desirable to have an improved technique for obtaining a black blood image of the heart.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 depicts double inversion recovery fast spin echo sequence showing the magnetization of blood as zero at the TI null point and the re-inverted myocardium signal high at the same TI null point.
Figure 2 depicts a radiofrequency preparation module used to null the blood signal.
Figure 3 is a black blood image with a clear view of papillary muscle and endocardiac border.
Figure 4 depicts a comparison between a conventional black blood image on left showing slow flow and the saturation RF pulse technique sequence described herein showing well suppressed flow.
A technique for obtaining a black blood image of the heart is proposed. As depicted in Figure 2, the techniqu...