A method of processing C-scan data comprising a sequence of B-scans of an imaging target , which has been acquired by an optical coherence tomography, OCT, imaging system , to generate correction data for compensating for axial displacements (d) between B-scans in the sequence of B-scans caused by a relative motion of the OCT imaging system and the imaging target that varies a distance therebetween during acquisition of the B-scans by the OCT imaging system , and to further generate a reliability indicator which indicates a reliability of the generated correction data, the method, when executed by a processor, comprising the steps of: generating (S10) the correction data by determining, for each pair of adjacent B-scans of a plurality of pairs of adjacent B-scans in the sequence, a respective indicator of an axial shift between respective representations of a common ocular feature in the adjacent B-scans ; and generating the reliability indicator by: calculating (S20), using pairs of B-scans in the sequence of B-scans , respective values of a metric which are indicative of respective speeds or respective accelerations of the imaging target relative to the OCT imaging system when the pairs of B-scans were acquired; determining (S30) if at least a predetermined number of the calculated values of the metric exceed a threshold value; in a case where at least the predetermined number of calculated values of the metric are determined to exceed the threshold value, setting (S40A) the reliability indicator to indicate that the correction data is unreliable; and in a case where at least the predetermined number of calculated values of the metric are determined to not exceed the threshold value, setting (S40B) the reliability indicator to indicate that the correction data is reliable. generating (S10) the correction data by determining, for each pair of adjacent B-scans of a plurality of pairs of adjacent B-scans in the sequence, a respective indicator of an axial shift between respective representations of a common ocular feature in the adjacent B-scans ; and generating the reliability indicator by: calculating (S20), using pairs of B-scans in the sequence of B-scans , respective values of a metric which are indicative of respective speeds or respective accelerations of the imaging target relative to the OCT imaging system when the pairs of B-scans were acquired; determining (S30) if at least a predetermined number of the calculated values of the metric exceed a threshold value; in a case where at least the predetermined number of calculated values of the metric are determined to exceed the threshold value, setting (S40A) the reliability indicator to indicate that the correction data is unreliable; and in a case where at least the predetermined number of calculated values of the metric are determined to not exceed the threshold value, setting (S40B) the reliability indicator to indicate that the correction data is reliable. calculating (S20), using pairs of B-scans in the sequence of B-scans , respective values of a metric which are indicative of respective speeds or respective accelerations of the imaging target relative to the OCT imaging system when the pairs of B-scans were acquired; determining (S30) if at least a predetermined number of the calculated values of the metric exceed a threshold value; in a case where at least the predetermined number of calculated values of the metric are determined to exceed the threshold value, setting (S40A) the reliability indicator to indicate that the correction data is unreliable; and in a case where at least the predetermined number of calculated values of the metric are determined to not exceed the threshold value, setting (S40B) the reliability indicator to indicate that the correction data is reliable. <EOS>