Author/Editor		Povšič, Klemen; Fležar, Matjaž; Možina, Janez; Jezeršek, Matija
Title		Laser 3-D measuring system and real-time visual feedback for teaching and correcting breathing
Type		članek
Source		Journal of biomedical optics
Vol. and No.		Letnik 17, št. 3
Publication year		2012
Volume		str. 36004-1-8
Language		eng
Abstract		We present a novel method for real-time 3-D body-shape measurement during breathing based on the laser multiple-line triangulation principle. The laser projector illuminates the measured surface with a pattern of 33 equally inclined light planes. Simultaneously, the camera records the distorted light pattern from a different viewpoint. The acquired images are transferred to a personal computer, where the 3-D surface reconstruction, shape analysis, and display are performed in real time. The measured surface displacements are displayed with a color palette, which enables visual feedback to the patient while breathing is being taught. The measuring range is approximately 400 x 600 x 500 mm in width, height, and depth, respectively, and the accuracy of the calibrated apparatus is ~ 0.7 mm. The system was evaluated by means of its capability to distinguish between different breathing patterns. The accuracy of the measured volumes of chest-wall deformation during breathing was verified using standard methods of volume measurements. The results show that the presented 3-D measuring system with visual feedback has great potential as a diagnostic and training assistance tool when monitoring and evaluating the breathing pattern, because it offers a simple and effective method of graphical communication with the patient.
Descriptors		BREATHING EXERCISES BREATH TESTS RESPIRATORY MECHANICS DIAGNOSTIC IMAGING CALIBRATION LASERS SPIROMETRY