Shoucong Ning, Wenhui Xu, Yinhang Ma, Leyi Loh, Timothy J Pennycook, Wu Zhou, Fucai Zhang, Michel Bosman, Stephen J Pennycook, N Duane Loh, Qian He，“A Hybrid Approach to Calibrate the Affine Transformation Between Scan-Camera Coordinates for 4D-STEM Datasets”，Microscopy and Microanalysis 28 (S1), 2532-2534（2022）

【原文】

A Hybrid Approach to Calibrate the Affine Transformation Between Scan-Camera Coordinates for 4D-STEM Datasets

ABSTRACT

Accurate geometrical calibration between scan-camera coordinates is critical in four-dimensional scanning transmission electron microscopy (4D-STEM)[1] for both quantitative imaging and ptychographic reconstructions. Such calibration is, however, not a trivial task since (i) 4D-STEM is more sensitive to the vortical nature of electron trajectories caused by the electromagnetic lenses compared to other STEM imaging modes that use detectors with circular symmetries;(ii) Most 4DSTEM experiments still need relatively long dwell time (eg,> 100μs per pixel) making them highly susceptible to instrumental instabilities and environmental disturbances.