| 摘要 |
The accuracy of noninvasive blood analysis methods is limited by the so-called tracking error. The correlation between the component concentration in the probed skin volume and the component concentration in the blood is improved by selecting particular locations on the patient's skin which provide a significantly higher density of capillary vessels than found on average (sweet spots). The higher capillary density causes the component concentration in the probed skin volume to better track the component concentration in the blood and as a useful side effect also improves the signal-to-noise ratio of the noninvasive measurement method itself. Methods for locating sweet spots and controlling the noninvasive measurement to selectively probe sweet spots are described. Also described are several embodiments of sweet spot imaging noninvasive measurement systems that integrate low-cost optical imaging of capillaries in the visible wavelength range with the high-accuracy noninvasive measurement in the component-specific, e.g., near-infrared, wavelength range.
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