Patent ID: 7633064

Claim:
An electric charged particle beam microscopy that irradiates a specimen with an electric charged particle beam, and detects the electric charged particle beam that is secondarily generated from the specimen to obtain an image of the specimen, the microcopy comprising: (a) a step of photographing a first specimen having a known structure at a first magnification, and measures an absolute distortion at the first magnification according to the obtained image; (b) a step of photographing a second specimen at the first magnification and a second magnification; (c) a step of measuring a relative distortion of the second magnification to the first magnification on the basis of the scaled image and the image obtained by photographing the second specimen at the second magnification; (d) a step of obtaining an absolute distortion of the second magnification on the basis of the absolute distortion of the first magnification and the relative distortion of the second magnification; and (e) a step of correcting the obtained absolute distortion of the second magnification.