title: Stent optical inspection system calibration and performance.
abstract: Implantable medical devices, such as stents, have to be inspected 100% so no defective ones are implanted into a human body. In this paper, a novel optical stent inspection system is presented. By the combination of a high numerical aperture microscope, a triple illumination system, a rotational stage, and a CMOS camera, unrolled sections of the outer and inner surfaces of the stent are obtained with high resolution at high speed with a line-scan approach. In this paper, a comparison between the conventional microscope image formation and this new approach is shown. A calibration process and the investigation of the error sources that lead to inaccuracies of the critical dimension measurements are presented.
authors.forename: Carlos
authors.initials: C
authors.lastname: Bermudez
authors.forename: Ferran
authors.initials: F
authors.lastname: Laguarta
authors.forename: Cristina
authors.initials: C
authors.lastname: Cadevall
authors.forename: Aitor
authors.initials: A
authors.lastname: Matilla
authors.forename: Sergi
authors.initials: S
authors.lastname: Ibañez
authors.forename: Roger
authors.initials: R
authors.lastname: Artigas