1. A catheter device for performing an atherectomy on a patient, comprising: an atherectomy catheter; an intravascular magnetic resonance tomography (IVMRI) sensor integrated with the atherectomy catheter that generates data of a target area of the patient; at least a second sensor which includes an OCT sensor or an IVUS sensor or a combination of the OCT sensor and the IVUS sensor, a position sensor integrated with the atherectomy catheter that generates data of a position of the atherectomy catheter; and an image-processing unit that: reads out the data of the position sensor and the data of the IVMRI sensor temporally offset to avoid mutual interference, and reads out data of at least the IVMRI sensor and the second sensor temporally offset to avoid mutual interference of data acquired from two different sensors, which image data are combined with position sensor data by the image-processing unit to form a combined image recording of the target area, the combination enabling recordation of image data which renders tissue layers visible with use of the IVMRI sensor and renders deeper tissue layers visible with the second sensor thereby providing an optimum representation of plaque or of a vascular wall on which plaque is removed.