Methods and devices are provided for reducing motion artifacts when monitoring volume changes in blood vessels. Light having a first wavelength and light having a second wavelength are transmitted through a human appendage, toward the epidermis of a patient, or through tissue within the body of a patient. A portion of the light having the first wavelength and a portion of the light having the second wavelength is received. A first signal is produced based on the received portion of light having the first wavelength. A second signal is produced based on the received portion of light having the second wavelength. One of the first and second signals is subtracted from the other to produce a plethysmography signal that is representative of volume changes in blood vessels of patient tissue.

 
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< Apparatus and method for generating calibration gas

< PLANAR LASER ILLUMINATION AND IMAGING (PLIIM) DEVICE EMPLOYING A LINEAR IMAGE DETECTION ARRAY HAVING VERTICALLY-ELONGATED IMAGE DETECTION ELEMENTS, WHEREIN THE HEIGHT OF THE VERTICALLY-ELONGATED IMAGE DETECTION ELEMENTS AND THE F/# PARAMETER OF THE IMAGE FORMATION OPTICS ARE CONFIGURED TO REDUCE SPECKLE-PATTERN NOISE POWER THROUGH SPATIAL-AVERAGING OF DETECTED SPECKLE-NOISE PATTERNS

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