Patent Document ID: 20110206271
Application ID: 13066939
Patent Status: 0

Claim One:
1. A pattern measurement apparatus comprising: an irradiation unit for irradiating a sample with an electron beam; an electron detection unit for detecting an amount of electrons generated, by the electron beam radiation, from the sample on which a pattern is formed; an image processor for generating an SEM image of the pattern on the basis of the amount of electrons; and a controller for acquiring a rectangular measurement specification region specifying a measurement target portion of the SEM image, and then calculating a loss ratio of a corner portion of the pattern from an area of the measurement specification region and an area of the corner portion of the pattern, wherein the controller detects an edge position in a predetermined range including a position where a corner of the measurement specification region and a side of the SEM image intersect with each other, and then adjusts the measurement specification region in accordance with the edge position.