Journal ArticleDOI
Determination of safe exposure levels of He/Ne laser light to the human body by means of erythrocyte irradiation studies
Megha Singh,Ammasi Periasamy +1 more
TLDR
The upper limit of these intensities, at which the erythrocytes maintain their normal characteristics, has been used to develop safety levels for the various organs of subjects of varying complexions, assuming that even the cells below the skin layer are not damaged by laser exposures.Abstract:
He/Ne laser irradiation produces various shape changes and haemolysis in erythrocytes. Under total absorption conditions, after correcting for the reflection from the surface, blood samples were exposed to various intensities of laser light. The upper limit of these intensities, at which the erythrocytes maintain their normal characteristics, has been used to develop safety levels for the various organs of subjects of varying complexions, assuming that even the cells below the skin layer are not damaged by laser exposures. Depending on the complexion these levels show considerable variations for various organs.read more
Citations
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Journal ArticleDOI
Three-dimensional reconstruction of cardiac displacement patterns on the chest wall during the P, QRS and T-segments of the ECG by laser speckle inteferometry
G. Ramachandran,Megha Singh +1 more
TL;DR: In this paper, a noninvasive and noncontact technique based on the principle of laser speckle interferometry has been developed to record the cardiac displacements observed on the chest wall.
Journal ArticleDOI
Low level laser therapy: A review
TL;DR: The biological and clinical effects of sub-thermal doses of laser light is an area of some controversy as mentioned in this paper, and the published scientific evidence for such effects is examined with particular reference to the physics of the light delivery and dosimetry.
Journal ArticleDOI
Reconstruction of sequential cardiac in-plane displacement patterns on the chest wall by laser speckle interferometry
Megha Singh,G. Ramachandran +1 more
TL;DR: Time-average speckle interferometry has been applied to obtain displacement patterns on the chest wall produced by cardiac action, in the absence of breathing, during various phases of the cardiac cycle and the functional details of the normal heart are outlined.
Journal ArticleDOI
Low-level laser therapy: A review
TL;DR: The biological and clinical effects of sub-thermal doses of laser light is an area of some controversy as discussed by the authors, and the published scientific evidence for such effects is examined with particular reference to the physics of the light delivery and dosimetry.
Journal ArticleDOI
Reconstruction of Cardiac Displacement Patterns on the Chest Wall by Laser Speckle Interferometry
Ammasi Periasamy,Megha Singh +1 more
TL;DR: The reconstructed cardiac displacement patterns, obtained by this new noncontact and noninvasive technique, provide information on the functioning of various parts of the heart in cardiac disorders which are in qualitative agreement with that of two-dimensional echocardiography.
References
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Journal ArticleDOI
An Instrument to Measure Cutaneous Blood Flow Using the Doppler Shift of Laser Light
TL;DR: A system utilizing the Doppler shift of monochromatic laser light has been developed to measure blood flow in skin, and the heterodyned output signal is amplified and both RMS and dc values obtained.
Journal ArticleDOI
Pupil Diameter and the Depth-of-field of the Human Eye as Measured by Laser Speckle
W.N. Charman,Helen D. Whitefoot +1 more
TL;DR: In this paper, a laser speckle pattern at 633 nm on the surface of a slowly rotating drum was used to measure the variation in the depth-of-field with pupil diameter.
Journal ArticleDOI
Blood Velocity Measurements in Human Retinal Vessels
TL;DR: Laser Doppler velocimetry was used to measure the velocity of blood in human retinal vessels and the mean flow velocities obtained were 1.9 centimeters per second in a retinal vein and 2.2 centimeters persecond in aretinal artery.
Journal ArticleDOI
Metabolism of the Hemin Chromoproteins
TL;DR: Equation 5 should read: Cytochrome c (rat, dog, man, cow)/W0.7kg.