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Medical diagnostic method
Laser Doppler imaging (LDI), also called laser Doppler perfusion imaging (LDPI), is a non-contact optical technique for mapping signals related to microvascular
Laser_Doppler_imaging
Optical method of measuring fluid flow
Laser Doppler velocimetry, also known as laser Doppler anemometry, is the technique of using the Doppler shift in a laser beam to measure the velocity
Laser_Doppler_velocimetry
Measuring technique
with a slow camera and a laser diode, holographic interferometry is sensitive enough to enable wide-field, laser Doppler imaging of optical fluctuations
Holographic_interferometry
Use of light for medical investigation
endoscopy, scanning laser ophthalmoscopy, laser Doppler imaging, optical coherence tomography, and transdermal optical imaging. Because light is an electromagnetic
Medical_optical_imaging
Method of spatial measurement using laser
or laser imaging, detection, and ranging, often stylized LiDAR) is a method for determining ranges by targeting an object or a surface with a laser and
Lidar
Frequency change of a wave for observer relative to its source
Experiment measuring the speed of light in moving water Laser Doppler imaging Photoacoustic Doppler effect Range rate Rayleigh fading – Radio signal statistical
Doppler_effect
Instrument for sensing microscopic vibrations of a surface
A laser Doppler vibrometer (LDV) is a scientific instrument that is used to make non-contact vibration measurements of a surface. The laser beam from
Laser_Doppler_vibrometer
Optic nerve head, the point of exit for ganglion cell axons leaving the eye
region can be revealed non invasively by near-infrared laser Doppler imaging. Laser Doppler imaging can enable mapping of the local arterial resistivity
Optic_disc
Chart of tissue blood volume changes
full-field imaging capability of pulsatile blood flow. Clitoral photoplethysmograph Heart rate monitor Hemodynamics Laser Doppler imaging Plethysmograph
Photoplethysmogram
direction. Wideband laser Doppler imaging by digital holography with a high-speed camera can overcome some of the limitations of laser Doppler flowmetry and
Photoacoustic_Doppler_effect
Medical condition
result in a rhythm that seems irregular. Electrocardiography and laser Doppler imaging allow to visualize premature heart beats. From their appearance
Premature_heart_beat
Medical diagnostic method
mortality. Mapping of the local arterial resistivity index from laser Doppler imaging enables unambiguous identification of retinal arteries and veins
Arterial_resistivity_index
Medical diagnostic method
reveal endoluminal blood flow profiles in the retina and choroid. Laser Doppler imaging by holography provides high-contrast visualization of local blood
Microangiography
Medical condition
as a rapid and noninvasive way of monitoring the macular edema. Laser Doppler imaging reveals dynamic hemodynamics discrepancies between branch arteries
Branch_retinal_vein_occlusion
Vascular layer of the eye
Schematic cross section of the human eye; choroid is shown in purple. Laser Doppler imaging of retinal and choroidal blood flow Iris, front view The terminal
Choroid
Physiological and psychological changes in preparation for sexual intercourse
directly measures changes in temperature of the labia. More recently, laser Doppler imaging (LDI) has been used as a direct measure of genital sexual arousal
Sexual_arousal
Cooling technique in atomic physics
Dehmelt. Both proposals outlined the simplest laser cooling process, known as Doppler cooling, where laser light tuned below an atom's resonant frequency
Laser_cooling
Device to determine relative phase shift
shot-noise limited holography with video-rate cameras, vibrometry, and laser Doppler imaging of blood flow. In optical telecommunications it is used as an electro-optic
Mach–Zehnder_interferometer
Medical condition
phenomenon or digital gangrene are very rare in Takayasu arteritis. Laser Doppler imaging by near-infrared digital holography can reveal characteristic blood
Takayasu's_arteritis
Dynamics of blood flow
cardiovascular diseases. Laser Doppler imaging by digital holography can measure blood flow in the retina and choroid, whose Doppler responses exhibit a pulse-shaped
Hemodynamics
Application of radar which is used to create two-dimensional images
wavelengths. To measure Doppler information requires a different type of detection scheme than is used for spatial imaging. The returned laser energy must be mixed
Imaging_radar
Group of eye diseases related to poor retinal and nerve perfusion
(2020). "Retinal blood flow reversal in out-of-plane vessels imaged with laser Doppler holography". arXiv:2008.09813 [physics.med-ph]. Alguire P (1990)
Glaucoma
Speed of the heartbeat, measured in beats per minute
measurement include seismocardiography. Pulse oximetry of the finger and laser Doppler imaging of the eye fundus are often used in the clinics. Those techniques
Heart_rate
Damage to the eye's retina due to high blood pressure
branch arteries can result from hypertension. Microangiography by laser Doppler imaging may reveal altered hemodynamics non-invasively. Mild signs of hypertensive
Hypertensive_retinopathy
Eye disease characterized by leakage of fluid under the retina
correlate with disease severity and possibly treatment outcome. Laser Doppler imaging can be used to reveal the underlying swollen choroidal vessels under
Central serous chorioretinopathy
Central_serous_chorioretinopathy
Method of utilizing water in magnetic resonance imaging
diffusion tensor imaging (DTI), has been used extensively to map white matter tractography in the brain. In diffusion weighted imaging (DWI), the intensity
Diffusion-weighted magnetic resonance imaging
Diffusion-weighted_magnetic_resonance_imaging
Range finding device that uses a laser beam to determine the distance to an object
A laser rangefinder, also known as a laser telemeter or laser distance meter, is a rangefinder that uses a laser beam to determine the distance to an object
Laser_rangefinder
Blood vessel supplying the retina of the eye
fovea. Its blood flow can be revealed by fluorescein angiography or laser Doppler imaging. Thus if the central retinal artery gets occluded, there is complete
Central_retinal_artery
Medical intervention
application. Most techniques use B-mode. Doppler sonography: This imaging technique makes use of the Doppler effect in detection and measuring moving
Medical_ultrasound
detuning Laser diffraction analysis Laser diode Laser diode rate equations Laser diode thermal desorption Laser Doppler velocimetry Laser Doppler vibrometer
List_of_laser_articles
Pressure exerted by circulating blood upon the walls of arteries
flow velocity waveforms in the central retinal artery (red) and vein (blue), measured by laser Doppler imaging in the eye fundus of a healthy volunteer.
Blood_pressure
Type of laser
coherence. The line is mostly Doppler broadened, which depends on the ions' temperature. As the common visible-light laser transitions between electronic
X-ray_laser
Laser using electron beam in vacuum as gain medium
can image proteins using x-ray crystallography. This technique allows first-time imaging of proteins that do not stack in a way that allows imaging by
Free-electron_laser
Medical diagnostic method
tissue structure and flow velocity imaging, as spectral-domain OCT is limited to fast imaging. Phase-resolved Doppler OCT, based around the invention of
Doppler optical coherence tomography
Doppler_optical_coherence_tomography
Swelling of the eye's optic disc due to high intracranial pressure
herniation, however newer imaging techniques have been more useful at determining when and when not to conduct a lumbar puncture. Imaging by CT or MRI is usually
Papilledema
Colored part of an eye
photographs of human irides Histology image: 08010loa – Histology Learning System at Boston University Atlas image: eye_1 at the University of Michigan
Iris_(anatomy)
Technique and process of creating visual representations of the interior of a body
Medical imaging is the technique and process of imaging the interior of a body for clinical analysis and medical intervention, as well as visual representation
Medical_imaging
Method to measure velocities in fluid
the flow being studied. Other techniques used to measure flows are laser Doppler velocimetry and hot-wire anemometry. The main difference between PIV
Particle_image_velocimetry
Device for measurement and imaging of vibration
The scanning laser vibrometer or scanning laser Doppler vibrometer, was first developed by the British loudspeaker company, Celestion, around 1979, further
Laser_scanning_vibrometry
Laser cooling technique
the experimental observation of cooling below the Doppler limit observed in cesium atom-related laser cooling experiments in 1985. Shortly after the theory
Polarization_gradient_cooling
Form of radar used to create images of landscapes
stationary antenna. A synthetic-aperture radar is an imaging radar mounted on a moving platform. SAR is a Doppler technique. It is based on the fact that "radar
Synthetic-aperture_radar
Hypothetical device
gamma-ray lasers include medical imaging, spacecraft propulsion, and cancer treatment. In his 2003 Nobel lecture, Vitaly Ginzburg cited the gamma-ray laser as
Gamma-ray_laser
Inflammation due to periodic blood vessel blockage
Claes (2013). "Combined computer assisted capillary microscopy and laser Doppler imaging used to assess redistribution changes in skin of erythromelalgic
Erythromelalgia
image velocimetry and particle tracking velocimetry, Molecular tagging velocimetry, laser-based interferometry, ultrasonic Doppler methods, Doppler sensors
Velocimetry
Technique for examining the circulation of the retina and choroid of the eye
measurement of the rate of blood flow through the imaged blood vessels. Fundus photography Laser Doppler imaging Fluorescein+Angiography at the U.S. National
Fluorescein_angiography
road surface) LIDAR Ground speed radar Doppler radar ANPR (where vehicles are timed over a fixed distance) Laser surface velocimeters for moving surfaces
List_of_sensors
Planar Doppler Velocimetry (PDV), also referred to as Doppler Global Velocimetry (DGV), determines flow velocity across a plane by measuring the Doppler shift
Planar_Doppler_velocimetry
Topics referred to by the same term
diffraction imaging, a lensless nanoscale imaging technique Current density imaging, an extension of magnetic resonance imaging (MRI) Color doppler imaging, a
CDI
Taiwanese ophthalmologist and inventor
tomography (OCT), an imaging modality widely used in ophthalmology and cardiology. He is the Wold Family Chair in Ophthalmic Imaging at the Casey Eye Institute
David_Huang_(ophthalmologist)
Scientific phenomenon
The relativistic Doppler effect is the change in frequency, wavelength and amplitude of light, caused by the relative motion of the source and the observer
Relativistic_Doppler_effect
Physics measurement techniques
substantial Doppler shift exhibited by Balmer-alpha light emitted by the energetic atoms in order to determine the density of the fast ions. Laser-induced
Plasma_diagnostics
Alternate blood flow around a blockage
Collateral tortuous vein (center, left) in central retinal vein occlusion, revealed by laser Doppler imaging.
Collateral_circulation
Technique for measuring chemical composition of a gas
flow of the gas in the path of the laser beam can be seen as a shift in the absorption spectrum, also known as Doppler shift. The shift in the frequency
Tunable diode laser absorption spectroscopy
Tunable_diode_laser_absorption_spectroscopy
Imaging technique
bandwidth. Frequency-shifted holograms can be used for narrowband laser Doppler imaging. Addressing simultaneously distinct domains of the temporal and
Digital_holography
Measurement of the Earth using satellites
accurate determination of Earth's flattening. The 1960s saw the launch of the Doppler satellite Transit-1B and the balloon satellites Echo 1, Echo 2, and PAGEOS
Satellite_geodesy
Measurement method using interference of waves
for imaging; for example, the H-alpha line or the Ca-K line of the Sun or stars. Fig. 10 shows an Extreme ultraviolet Imaging Telescope (EIT) image of
Interferometry
Atoms kept at temperatures close to absolute zero
the major technical challenges in Doppler cooling was increasing the amount of time an atom can interact with the laser light. This challenge was overcome
Ultracold_atom
Information method in electromagnetic radiation
multi-pulse coherent Doppler LIDAR. Fibre-optic gyroscope Heterodyne Homodyne Interferometry Laser Doppler vibrometer Laser microphone Laser turntable Optical
Optical_heterodyne_detection
Extension of endometrial tissue into the myometrium
non-invasive imaging. Nevertheless, non-invasive imaging techniques such as transvaginal ultrasonography (TVUS) and magnetic resonance imaging (MRI) can
Adenomyosis
due to more precise imaging tools and more advanced techniques. One example is laser Doppler studies which uses laser doppler imaging to observe the skin
Axon_reflex
Common configuration for optical interferometry
Spectral Imaging of the Atmosphere. Academic Press. ISBN 0-12-639481-4. Shepherd, G. G.; et al. (1985). "WAMDII: wide angle Michelson Doppler imaging interferometer
Michelson_interferometer
Study involving matter and electromagnetic radiation
molecules can be identified. Saturated spectroscopy uses a dual laser technique to remove the Doppler profiles from spectroscopic signals of hot atoms. It does
Spectroscopy
Chinese jet ground-attack aircraft
nav/attack system: Project CC, Q-5I with indigenous Type 205 doppler navigation system, Q5HK-15 laser rangefinder and SH-1IIA sight. One year later, head-up
Nanchang_Q-5
Technology for measuring geometrical dimensions of particle
measurement techniques for sprays: Comparison of image analysis, phase Doppler particle analysis, and laser diffraction". AIP Advances. 11 (1): 015315. Bibcode:2021AIPA
Laser_diffraction_analysis
NASA technology
The flash lidar flashes a laser and acts like a flash camera permitting the generation of lidar maps and images. The Doppler lidar measures the vehicle's
Autonomous Landing Hazard Avoidance Technology
Autonomous_Landing_Hazard_Avoidance_Technology
Apparatus for trapping and cooling neutral atoms
trapping laser plus any necessary repumper lasers (see above). These lasers require frequency stability, with a linewidth much less than the Doppler width
Magneto-optical_trap
Biomedical engineering professor at UC Irvine
and its functional extensions for biomedical imaging. His published work includes early studies on Doppler OCT (D-OCT), a method for measuring blood flow
Zhongping_Chen
Topics referred to by the same term
Alliance, an ecumenical Christian first-day Sabbatarian organization Laser Doppler anemometry, to measure velocity Latent Dirichlet allocation, in natural
LDA
Object detection system using radio waves
Terrain-following radar Radar imaging Radar navigation Inverse-square law Wave radar Radar signal characteristics Pulse doppler radar Mmwave sensing Acronyms
Radar
Imaging technique
Kachelmyer AL (1989-02-18). Becherer RJ (ed.). "Range-Doppler Imaging Waveforms And Receiver Design". Laser Radar III. 0999. SPIE: 138–161. Bibcode:1989SPIE
Optical_coherence_tomography
Geodetic reference system
coverage, new data types, and improved techniques. Observations from Doppler, satellite laser ranging, and very-long-baseline interferometry (VLBI) constituted
World_Geodetic_System
Artery which supplies blood to the intestines and pancreas
S2CID 7926213. Redaelli CA, Schilling MK, Büchler MW (1998). "Intraoperative laser Doppler flowmetry: a predictor of ischemic injury in acute mesenteric infarction"
Superior_mesenteric_artery
Instrument for measuring wind speed
classic hot-wire anemometer. In laser Doppler velocimetry, laser Doppler anemometers use a beam of light from a laser that is divided into two beams,
Anemometer
Dynamic collection of drops dispersed in a gas
widely used methods of drop size measurements are laser diffraction, optical imaging, and phase Doppler. All of these optical methods are non-intrusive
Spray_(liquid_drop)
Timing of substance within a medium
(indirect time of flight, iToF, e.g., by light scattered from an object in laser doppler velocimetry). Time of flight technology has found valuable applications
Time_of_flight
Number of pulses of a repeating signal
APY-1 radar used 128 IPP's with a fixed 50 range gates, producing 128 Doppler filters using an FFT. The different number of range gates on each of the
Pulse-repetition_frequency
invisible to the naked eye. Techniques like Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) rely on seeding to obtain accurate data
Seeding_(fluid_dynamics)
Device which diffracts light via sound waves
dumping Modelocking Laser Doppler vibrometer Film scanner Confocal microscopy Synthetic array heterodyne detection Hyperspectral Imaging Acousto-optics Acousto-optic
Acousto-optic_modulator
1938 experiment confirming relativistic time dilation
relativistic time dilation to the Doppler shift of light. The result was in agreement with the formula for the transverse Doppler effect and was the first direct
Ives–Stilwell_experiment
Atomic-scale structure formed through the Stark shift by opposing beams of light
An optical lattice is formed by the interference of counter-propagating laser beams, creating a spatially periodic intensity pattern. The resulting periodic
Optical_lattice
Sensor that detects nearby objects
displacement sensor Doppler effect Inductive Magnetic, including magnetic proximity fuse Optical Photoelectric Photocell (reflective) Laser rangefinder Passive
Proximity_sensor
Human eye disease causing full or partial blindness
vessels may be seen. Imaging studies such as ultrasonography (US), Computerized Tomography (CT) and Magnetic Resonance Imaging (MRI) can aid diagnosis
Coats'_disease
Technology for measuring surface waves on water
transceivers may be coherent or non-coherent. Coherent radars measure Doppler-modulation as well as amplitude modulation, while non-coherent radars only
Wave_radar
Gunship aircraft series by Lockheed
two Image-Intensified Television (I2TV) cameras (CCD-TV), laser target designator/rangefinder with eyesafe mode (1064 and 1570 nm dual mode laser emitter)
Lockheed_AC-130
Relativistic effect due to rotation
at the same speeds, Doppler effects cancel out, so the Sagnac effect does not involve the Doppler effect. In the case of ring laser interferometry, it
Sagnac_effect
dwarf. Direct imaging can be used to accurately measure the planet's orbit around the star. Unlike the majority of other methods, direct imaging works better
Methods of detecting exoplanets
Methods_of_detecting_exoplanets
European mission to study Jupiter and its moons since 2023
MAJIS visible and infrared imaging spectrometer, the UVS ultraviolet imaging spectrograph, RIME radar sounder, GALA laser altimeter, SWI submillimetre
Jupiter_Icy_Moons_Explorer
Medical imaging and optical technique
medical imaging and optical technique that utilizes near-infrared light to directly and non-invasively measure tissue blood flow. The imaging modality
Diffuse correlation spectrometry
Diffuse_correlation_spectrometry
delay compensation a ring laser in an underground observatory for monitoring the Earth's rotation a beacon for the French Doppler system DORIS a superconducting
Geodetic_Observatory_Wettzell
Medical condition
defined or irregular. Some lesions have a cystic or more complex appearance. Doppler studies are helpful to identify the characteristic aberrant systemic artery
Pulmonary_sequestration
Type of very-high-resolution microscopy
oscillations down to 10pm have been detected with this method. Laser Doppler vibrometry – A laser Doppler vibrometer can be used to produce very accurate deflection
Atomic_force_microscopy
Defunct Canadian company
Interoptics). in Shepherd, Gordon G., ed. (2003). "Doppler Michelson interferometry". Spectral Imaging of the Atmosphere. International Geophysics. Vol
Lumonics
History of a radar technology
In essence, signal strength in isolated discrete bands of Doppler frequency defined image intensities that were displayed at matching angular positions
History of synthetic-aperture radar
History_of_synthetic-aperture_radar
American professor of dentistry
European Society of Endodontology in 1987 for her innovative work applying Laser Doppler flowmetry techniques to oral research. While at Heidelberg, she received
Petra_Wilder-Smith
Space propulsion method using Sun radiation
the large surface is akin to a sail being blown by the wind. High-energy laser beams could be used as an alternative light source to exert much greater
Solar_sail
Imaging by sections or sectioning using a penetrative wave
Chemical imaging 3D reconstruction Discrete tomography Geometric tomography Geophysical imaging Industrial computed tomography Johann Radon Medical imaging Network
Tomography
of the technique include real-time image processing using on-camera FPGA chip. Hot-wire anemometry Laser Doppler velocimetry Molecular tagging velocimetry
Particle_tracking_velocimetry
Surface-to-air missile
was used as a movie screen onto which terrain images were projected. A copper vapor laser projected images of targets and the missiles in-flight on top
Rapier_(missile)
Raised red skin lesion that affects infants caused by benign vascular tumor
history and physical examination. In rare cases, imaging (ultrasound with Doppler, magnetic resonance imaging), and/or cytology or histopathology are needed
Infantile_hemangioma
Facility used to test engines
air flow rate. Laser technology adds useful tools to improve engine design during engine testing. Lasers sensors using laser Doppler velocimetry with
Engine_test_stand
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