Method to improve medical imaging ability.
This invention is a "pre-pulse" that can be added to most existing imaging pulse sequences. It produces image contrast between tissues having different T1rho values. Muscle (short T1rho) is made darker then blood (long T1rho), which aids in imaging the heart. This pulse differs from the majority of earlier T1rho methods serving as a source of image contrast in that it is compensated against spatial variations of the main imaging field. These variations cause regional loss of magnetization (the source of image signal) in a way independent of T1rho (losses therefore not contributing to contrast). When imaging flowing blood, this problem is exacerbated and no longer just regional. This invention overcomes these difficulties by providing a new method of magnetizing the object.