The method for measuring the left atrial thickness of the heart by the device for measuring the left atrial thickness of the heart according to an embodiment of the present invention includes: (a) an Nth (N is an amount of 3 or more) including a Hounsfield value given for each pixel. The integer of) extracting a plurality of pixels corresponding to the outline of the left atrium of the heart from a computed tomography image (CT), and calculating a 2D normal vector for each, (b) the Nth computed tomography Using coordinates of a plurality of pixels corresponding to the outline of the left atrium of the heart extracted from the captured image, among the first to N-1th, N+1th to Mth (M is a positive integer greater than 5) computed tomography images Extracting a plurality of pixels corresponding to the outline of the left atrium of the heart from any one or more, and calculating a 2D normal vector for each, (c) on the outline of the left atrium of the heart extracted from the Nth computed tomography image For each of a plurality of corresponding pixels and a plurality of pixels corresponding to an outline of the left atrium of the heart extracted from one or more of the first to N-1th and N+1th to Mth computed tomography images, the plurality of pixels Calculating a 3D normal vector using each coordinate and the calculated 2D normal vector, (d) assigned to a plurality of pixels corresponding to the directions of the 3D normal vector for each of the calculated plurality of pixels. Compensating the Hounsfield value by applying an interpolation method, and (e) calculating the thickness of the left atrium of the heart by applying a Full Width at Half Maximum to the corrected Hounsfield value. do.본 발명의 일 실시 예에 따른 심장의 좌심방 두께 측정 장치가 심장의 좌심방 두께를 측정하는 방법은, (a) 픽셀(Pixel) 별로 부여된 하운스필드 수치를 포함하는 제 N (N은 3 이상의 양의 정수) 컴퓨터 단층 촬영 영상(CT, Computed Tomography)에서 상기 심장의 좌심방의 외곽선에 대응되는 복수 개의 픽셀을 추출하고, 각각에 대한 2차원 법선 벡터를 산정하는 단계, (b) 상기 제N 컴퓨터 단층 촬영 영상에서 추출한 심장의 좌심방의 외곽선에 대응되는 복수 개의 픽셀의 좌표를 이
