The membrane shape mapping of the artificial ventricle in the actual dimensions

Abstract

Abstract-The paper sets out and presents a new approach to determine the shape of the flaccid membrane of the extracorporeal pneumatic heart assist pump. This is a continuation of earlier work on the use of image processing and analysis techniques to determine the membrane shape of an artificial ventricle. The study focused on the membrane shape mapping in the actual dimensions -in the real world. The method to transform measurement results in pixels to dimensions in the real world in millimetres as well as the obtained results of this process were presented.

Optical distortion compensation in the visual measurement with the new Depth From Defocus method

“…Until now the mapping and visualization * E-mail: Wojciech.Sulej@wat.edu.pl of the membrane shape has been performed only in the virtual world -in pixels. Currently, works are carried out to determine the membrane shape in actual dimensions (in millimetres) -in the real world [8].…”

“…The problem does not lie in the part of the method that concerns the x-and y-coordinates because they are determined directly, based on pixel coordinates of the image [8]. Thus, there is no loss of information after the conversion from the x and y coordinates of pixels in the image to x u and y u respectively if the classic approach is used in this part.…”

“…Only after this operation is the z-coordinate of each marker location in the 3-dimensional space determined using A c based on the transformation equations presented in [8]. While carrying out measurements using the invented DFD type method for determining the membrane shape in the actual dimensions without introducing any additions or amendments, high inaccuracy of shape mapping of the tested membrane was obtained, Fig.…”