Monitoring the Effect of PDT on in Vivo Oxygen Saturation and Microvascular Circulation

2003 ◽  
pp. 235-244 ◽  
Author(s):  
Josephine H. Woodhams ◽  
Lars Kunz ◽  
Stephen G. Bown ◽  
Alexander J. MacRobert
Keyword(s):  
Oxygen Saturation

scholarly journals Optical Measurement of Blood Oxygen Saturation of Dental Pulp

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Satoko Kakino ◽  
Shinya Kushibiki ◽  
Azusa Yamada ◽  
Zenzo Miwa ◽  
Yuzo Takagi ◽  
...  
Keyword(s):  
Light Intensity ◽  
Oxygen Saturation ◽  
Dental Pulp ◽  
Optical Measurement ◽  
Blood Oxygen ◽  
Arterial Pulse ◽  
Blood Oxygen Saturation ◽  
Visible Wavelengths

The applicability of arterial pulse oximetry to dental pulp was demonstrated using in vitro and in vivo measurements. First, porcine blood of known oxygen saturation (SO2) was circulated through extracted human upper incisors, while transmitted-light plethysmography was performed using three different visible wavelengths. From the light intensity waveforms measured in vitro, a parameter that is statistically correlated to SO2 was calculated using the pulsatile/nonpulsatile component ratios of two wavelengths for different SO2. Then, values were measured in vivo for living incisors, and the corresponding SO2 values were calculated using the results of in vitro measurements. The estimated SO2 values of the upper central incisors measured in vivo were from 71.0 to 92.7%. This study showed the potential to measure the oxygen saturation changes to identify the sign of pulpal inflammation.

In Vivo Estimation of Oxygen Saturation of Hemoglobin in Hepatic Lobules in Rats

1988 ◽  
pp. 591-596 ◽  
Author(s):  
Hiroshi Eguchi ◽  
Nobuhiro Sato ◽  
Takakatsu Matsumura ◽  
Sunao Kawano ◽  
Takenobu Kamada
Keyword(s):  
Oxygen Saturation

The Choroidal Eye Oximeter: An Instrument for Measuring Oxygen Saturation of Choroidal Blood In Vivo

1975 ◽  
Vol BME-22 (3) ◽  
pp. 183-195 ◽  
Author(s):  
Ronald A. Laing ◽  
Lee A. Danisch ◽  
Laurence R. Young
Keyword(s):  
Oxygen Saturation

Determination of red blood cell oxygenation in vivo by dual video densitometric image analysis

1990 ◽  
Vol 258 (4) ◽  
pp. H1216-H1223 ◽  
Author(s):  
C. G. Ellis ◽  
M. L. Ellsworth ◽  
R. N. Pittman
Keyword(s):  
Oxygen Saturation ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Striated Muscle ◽  
Wave Length ◽  
Retractor Muscle ◽  
Light Intensities ◽  
Microscopic Field

We have developed a new video microspectrophotometric system for the in vivo determination of oxygen saturation in red blood cells in striated muscle capillaries. This method allows one to quantify changes in the oxygenation of small groups of red blood cells as they traverse the capillary. Simultaneous images of a single microscopic field are recorded using two silicon-intensified target cameras and high-resolution video recorders. One image is recorded at an oxygen-dependent wave-length (431 nm) and the other at an isosbestic wavelength (420 nm). Light intensities from 10 adjacent pixels aligned along the axis of the capillary from identical 10-s segments of the video-tapes are digitized once per frame. Both sets of data are redisplayed simultaneously as two-dimensional images (10 pixels high x 300 frames wide) using a graphics system. These images show alternating bright and dark bands corresponding to plasma gaps and red blood cells. Light intensities in the presence and absence of red blood cells are determined by positioning a window over the appropriate region of the graphics image. Optical densities of single red blood cells at the two wavelengths, OD431 and OD420, are computed as is their ratio (OD431/OD420), which is linearly related to oxygen saturation. In vivo calibration studies in capillaries of the hamster retractor muscle indicate that the error in measuring oxygen saturation with this technique is approximately 2.7% saturation for a group of 10 cells.

In Vivo and In Vitro Studies of a Chronic Oxygen Saturation Sensor

1991 ◽  
Vol 14 (10) ◽  
pp. 1514-1527 ◽  
Author(s):  
GEORGE PHILIP SEIFERT ◽  
ALAN A. MOORE ◽  
KEN L. GRAVES ◽  
STUART P. LAHTINEN
Keyword(s):  
Oxygen Saturation ◽  
In Vitro Studies
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