A system, comprising: a platform to receive a body portion of a user during use; an imaging device coupled to the platform and to acquire a set of images of at least a capillary bed of the body portion; a controller, communicably coupled to the imaging device, to: detect, in each image of the set of images, one or more capillaries in the capillary bed of the body portion to identify a first set of capillaries across the set of images, by estimating one or more attributes of each capillary of the first set of capillaries, the one or more attributes including one or more structural attributes, one or more flow attributes, one or more imaging attributes, or combinations thereof, such that a first attribute of the one or more attributes of each capillary of the first set of capillaries meets a predetermined criterion for the first attribute, including generating a numerical confidence value associated with the image of each capillary of the first set of capillaries in the set of images, the first set of capillaries including those capillaries for which the confidence value, for each image in which that capillary is detected, exceeds a numerical confidence threshold; and identify a second set of capillaries from the first set of capillaries such that each capillary of the second set of capillaries is visible in a predetermined number of images of the set of images. a platform to receive a body portion of a user during use; an imaging device coupled to the platform and to acquire a set of images of at least a capillary bed of the body portion; a controller, communicably coupled to the imaging device, to: detect, in each image of the set of images, one or more capillaries in the capillary bed of the body portion to identify a first set of capillaries across the set of images, by estimating one or more attributes of each capillary of the first set of capillaries, the one or more attributes including one or more structural attributes, one or more flow attributes, one or more imaging attributes, or combinations thereof, such that a first attribute of the one or more attributes of each capillary of the first set of capillaries meets a predetermined criterion for the first attribute, including generating a numerical confidence value associated with the image of each capillary of the first set of capillaries in the set of images, the first set of capillaries including those capillaries for which the confidence value, for each image in which that capillary is detected, exceeds a numerical confidence threshold; and identify a second set of capillaries from the first set of capillaries such that each capillary of the second set of capillaries is visible in a predetermined number of images of the set of images. detect, in each image of the set of images, one or more capillaries in the capillary bed of the body portion to identify a first set of capillaries across the set of images, by estimating one or more attributes of each capillary of the first set of capillaries, the one or more attributes including one or more structural attributes, one or more flow attributes, one or more imaging attributes, or combinations thereof, such that a first attribute of the one or more attributes of each capillary of the first set of capillaries meets a predetermined criterion for the first attribute, including generating a numerical confidence value associated with the image of each capillary of the first set of capillaries in the set of images, the first set of capillaries including those capillaries for which the confidence value, for each image in which that capillary is detected, exceeds a numerical confidence threshold; and identify a second set of capillaries from the first set of capillaries such that each capillary of the second set of capillaries is visible in a predetermined number of images of the set of images.