1. A guiding system for positioning a patient for medical image acquisition, the system comprising: a patient position detecting device; and a patient position prescribing device; wherein the patient detecting device is configured: to detect an anatomy of interest of a patient for the medical image acquisition; and to detect current spatial information of the anatomy of interest; and wherein the patient position prescribing device is configured: to provide an initial target position, being a virtual scene of a virtual patient in the correct position, for the detected anatomy of interest during the image acquisition and to register a subset of the initial target position with the current spatial information of the anatomy of interest insofar said subset is clinically irrelevant for the medical image acquisition thereby providing for an adapted target position.