A line-field Fourier-domain optical coherence tomography, OCT, imaging system, comprising: a line-field illumination source arranged to generate a line of light (L L); a scanning system comprising a scanning element and a curved mirror having a first focal point (F P1) and a conjugate second focal point (F P2), the scanning element being located at the first focal point (F P1) and arranged to perform a scan of an imaging target via the second focal point (F P2), by scanning at least a segment of the line of light (L L) across the imaging target via the curved mirror, the scanning element being further arranged to receive, via the curved mirror, light which has been scattered by the imaging target during the scan and aberrated by the curved mirror to form an aberrated line of light (L A) comprising at least one of a defocussing or a distortion; a photodetector comprising an array of photodetector elements; an interferometer arranged to receive at least a segment of the aberrated line of light (L A) via the scanning element, generate an interference line of light (L I) resulting from an interference between a reference light (L R) and the at least a segment of the aberrated line of light (L A) received via the scanning element, and project the interference line of light (L I) onto the array of photodetector elements, wherein the photodetector is arranged to detect the interference line of light (L I) projected onto the array of photodetector elements during the scan, and generate a detection signal (S d) based on the detected interference line of light (L I); and OCT data processing hardware arranged to: generate complex volumetric OCT data of the imaging target based on the detection signal (S d), wherein the complex volumetric OCT data has an optical aberration therein; and generate corrected complex volumetric OCT data by executing a correction algorithm which uses phase information encoded in the complex volumetric OCT data to correct the complex volumetric OCT data, such that the corrected complex volumetric OCT data has less of the optical aberration than the complex volumetric OCT data. a line-field illumination source arranged to generate a line of light (L L); a scanning system comprising a scanning element and a curved mirror having a first focal point (F P1) and a conjugate second focal point (F P2), the scanning element being located at the first focal point (F P1) and arranged to perform a scan of an imaging target via the second focal point (F P2), by scanning at least a segment of the line of light (L L) across the imaging target via the curved mirror, the scanning element being further arranged to receive, via the curved mirror, light which has been scattered by the imaging target during the scan and aberrated by the curved mirror to form an aberrated line of light (L A) comprising at least one of a defocussing or a distortion; a photodetector comprising an array of photodetector elements; an interferometer arranged to receive at least a segment of the aberrated line of light (L A) via the scanning element, generate an interference line of light (L I) resulting from an interference between a reference light (L R) and the at least a segment of the aberrated line of light (L A) received via the scanning element, and project the interference line of light (L I) onto the array of photodetector elements, wherein the photodetector is arranged to detect the interference line of light (L I) projected onto the array of photodetector elements during the scan, and generate a detection signal (S d) based on the detected interference line of light (L I); and OCT data processing hardware arranged to: generate complex volumetric OCT data of the imaging target based on the detection signal (S d), wherein the complex volumetric OCT data has an optical aberration therein; and generate corrected complex volumetric OCT data by executing a correction algorithm which uses phase information encoded in the complex volumetric OCT data to correct the complex volumetric OCT data, such that the corrected complex volumetric OCT data has less of the optical aberration than the complex volumetric OCT data. generate complex volumetric OCT data of the imaging target based on the detection signal (S d), wherein the complex volumetric OCT data has an optical aberration therein; and generate corrected complex volumetric OCT data by executing a correction algorithm which uses phase information encoded in the complex volumetric OCT data to correct the complex volumetric OCT data, such that the corrected complex volumetric OCT data has less of the optical aberration than the complex volumetric OCT data.