Phase contrast radiology system for irradiating a subject with a radiation beam on a target radiation area on the subject, comprising a radiation source arranged to emit the radiation beam; a radiation detector placed opposite the radiation source across an examination region for receiving the subject; an optical grating arrangement (G0, G1, G2) arranged between the radiation source and the radiation detector, preferably an arrangement of successively: a source grating, a phase grating and, preferably, an analyzer grating from the radiation source to the radiation detector in a phase contrast imaging arrangement, particularly in a Talbot Lau interferometer phase contrast imaging arrangement; a system for indicating the desired target radiation area on the subject comprising: a first light field generator, configured to generate and project a first light field towards the subject in a first light field direction (x); a second light field generator, configured to generate and project a second light field towards the subject in a second, different light field direction (y); wherein, when in use, the first light field and the second light field at least partially overlap each other on the subject forming an overlapping light field area indicating the desired target radiation area; and wherein a collimator arrangement to collimate the radiation beam is arranged such that, when in use, the radiation beam is emitted towards the indicated target radiation area and irradiates substantially only the indicated target radiation area; wherein the first light field projector and the second light field projector are arranged to project the respective first light field and second light field light at a different angle towards the subject than that of the radiation beam. a radiation source arranged to emit the radiation beam; a radiation detector placed opposite the radiation source across an examination region for receiving the subject; an optical grating arrangement (G0, G1, G2) arranged between the radiation source and the radiation detector, preferably an arrangement of successively: a source grating, a phase grating and, preferably, an analyzer grating from the radiation source to the radiation detector in a phase contrast imaging arrangement, particularly in a Talbot Lau interferometer phase contrast imaging arrangement; a system for indicating the desired target radiation area on the subject comprising: a first light field generator, configured to generate and project a first light field towards the subject in a first light field direction (x); a second light field generator, configured to generate and project a second light field towards the subject in a second, different light field direction (y); wherein, when in use, the first light field and the second light field at least partially overlap each other on the subject forming an overlapping light field area indicating the desired target radiation area; and a first light field generator, configured to generate and project a first light field towards the subject in a first light field direction (x); a second light field generator, configured to generate and project a second light field towards the subject in a second, different light field direction (y); wherein, when in use, the first light field and the second light field at least partially overlap each other on the subject forming an overlapping light field area indicating the desired target radiation area; and wherein a collimator arrangement to collimate the radiation beam is arranged such that, when in use, the radiation beam is emitted towards the indicated target radiation area and irradiates substantially only the indicated target radiation area; wherein the first light field projector and the second light field projector are arranged to project the respective first light field and second light field light at a different angle towards the subject than that of the radiation beam.