A method for planning an intracorporeal positioning of a puncture needle to be introduced percutaneously into a patient on the basis of a puncture plan, comprising the following method steps: a) arranging a needle guide means in a spatially fixed manner on the patient, b) generating and storing a series of cross-sectional images, respectively containing spatially resolved image information of the patient and of the needle guide means connected in a spatially fixed manner to the patient in a first coordinate system, using an imaging diagnostic method, c) selecting and visually displaying at least one cross-sectional image or a numerically generated cross-sectional image from the series of stored cross-sectional images, d) superimposing a virtual, positionally variable linear trajectory on the basis of the selected cross-sectional image, e) positioning the virtual linear trajectory on the basis of the puncture plan to obtain a target linear trajectory, in which the virtual linear trajectory traverses the needle guide means, f) numerically determining spatial coordinates of two separate spatial points, the so-called traverse points (T1, T2), within the first coordinate system, at which traverse points the target linear trajectory traverses the needle guide means, g) transforming of spatial coordinates relating to the needle guide means and to the traverse points (T1, T2) to a second coordinate system, characterized in that the needle guide means comprises at least one upper plate element, arranged away from the patient, and a lower plate element, arranged facing the patient, which are spaced rigidly apart from one another and provide respectively a plurality of through-holes for the guiding through of a puncture needle, that the positioning of the virtual linear trajectory is carried out on the basis of the puncture plan to obtain the target linear trajectory in such a way that the target linear trajectory runs respectively through the through-hole of the upper and lower plate element (2, 3), and that the needle guide means is visually displayed within the second coordinate system in such a way that the traverse points (T1, T2) are displayed in a visually perceptible marked manner on the needle guide means. a) arranging a needle guide means in a spatially fixed manner on the patient, b) generating and storing a series of cross-sectional images, respectively containing spatially resolved image information of the patient and of the needle guide means connected in a spatially fixed manner to the patient in a first coordinate system, using an imaging diagnostic method, c) selecting and visually displaying at least one cross-sectional image or a numerically generated cross-sectional image from the series of stored cross-sectional images, d) superimposing a virtual, positionally variable linear trajectory on the basis of the selected cross-sectional image, e) positioning the virtual linear trajectory on the basis of the puncture plan to obtain a target linear trajectory, in which the virtual linear trajectory traverses the needle guide means, f) numerically determining spatial coordinates of two separate spatial points, the so-called traverse points (T1, T2), within the first coordinate system, at which traverse points the target linear trajectory traverses the needle guide means, g) transforming of spatial coordinates relating to the needle guide means and to the traverse points (T1, T2) to a second coordinate system,