1. A method for acquiring and displaying medical image data, comprising: scanning an examination object by way of a magnetic resonance imaging scanner and subsequently generating first image data of the examination object, wherein scanning parameters during the scan are selected such that regions of interest in the scanned examination object have high image data values, and the regions which are not of interest in the examination object have, relative thereto, low image data values in the first image data; generating a mask on the basis of the first image data by way of which mask regions in the first image data which have the low image data values can be hidden; scanning the examination object by way of a medical imaging system and generating second image data of the examination object; applying the mask to at least one of the first and second image data; and displaying the at least one of first and second image data to which the mask is applied.