Medical imaging method with guidance

A method for operating a medical imaging system, comprising:

• determining, by a data processing unit, a positioning rule, at least indicating, at least for a region of interest, one or more target positions, wherein a deviation between an actual position and the target position can affect imaging performance;
• obtaining, by the data processing unit, measurement data of at least the region of interest, to derive the actual position of at least the region of interest;
• determining, by the data processing unit, a current deviation between the actual position and the target position of at least the region of interest, by comparing the positioning rule with the obtained measurement data;
• generating, by the data processing unit, imaging performance information, at least indicating whether the current deviation between the actual position and the target position of at least the region of interest currently affects the imaging performance in terms of image quality and/or remaining imaging time or not, or is expected to affect the imaging performance in terms of image quality and/or remaining imaging time or not;
• and
• providing, by the data processing unit, the generated imaging performance information to be communicated to a subject to be imaged.