For all these reasons, alternative breast screening modalities have been sought for high risk women and the most promising of these is MRI, which has several theoretical advantages over mammography.
The intravenous contrast agent, Gadolinium DTPA, used with MRI concentrates in areas of tumor angiogenesis
Breast MRI gives tomographic, 3-D images
For both these reasons its sensitivity is much less affected by breast density.
The lack of ionizing radiation is at the very least reassuring to many women.

And they are delighted to learn that breast compression is not necessary.