Intraoperative Doppler
Intraoperative Doppler - Related Videos
09:12
Sound Waves and Doppler Shift
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2023
Source: Arianna Brown, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Waves are disturbances that propagate through a material medium or empty space. Light waves can travel through a vacuum and some forms of matter, and are transverse in nature, which means that the oscillations are perpendicular to the direction of propagation. However, sound waves are pressure waves that travel through an elastic medium like air,...
00:56
Doppler Effect - I
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2023
The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
01:05
Doppler Effect - II
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2023
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
10:46
Doppler Optical Coherence Tomography of Retinal Circulation
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Cited by 29 •
2012
Total retinal blood flow is measured by Doppler optical coherence tomography and semi-automated grading software.
10:31
Intraoperative Gastroscopy for Tumor Localization in Laparoscopic Surgery for Gastric Adenocarcinoma
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Cited by 12 •
2016
In early gastric cancer, the aim of surgery is to precisely remove the distal stomach including the primary tumor. To do this, accurate localization of the tumor is crucial, especially in totally laparoscopic surgery. This protocol describes a procedure for intraoperative gastroscopy in totally laparoscopic subtotal gastrectomy.
FAQs
The frequency shift comes from echoes returned by moving red blood cells. Its analysis provides information about whether blood is moving toward or away from the ultrasound source and how rapidly it is moving. This converts motion within vessels and tissues into hemodynamic information that clinicians can evaluate while the operation is still in progress.
Flow direction and velocity help distinguish normal circulation from altered or compromised blood movement. These measurements give surgeons more than a structural view of the operative site, because they show how blood is behaving dynamically. That information can support immediate decisions when vessel function or tissue perfusion appears uncertain during the procedure.
The technique evaluates moving blood through sound-wave echoes rather than requiring removal of the examined tissue. By assessing vessel patency and tissue perfusion directly in the operative field, it can reveal compromised circulation while preserving the tissue being assessed. This makes the information available during surgery, when corrective decisions may still be possible.
Its information is especially useful while the surgical site remains accessible and before closure. Surgeons can assess whether vessels remain open, whether tissues receive adequate blood flow, and whether circulation has become compromised. Detecting an abnormal finding at this stage may help guide an immediate decision instead of discovering the problem after the operation.
The method can support procedures involving vascular repair, transplantation, neurosurgery, and tumor removal. In each setting, the relevant question is whether blood vessels remain functional and whether nearby tissues retain adequate perfusion. Its role is therefore adaptable across operations in which circulation must be checked during treatment rather than inferred only afterward.
Clinicians interpret the observed flow information to confirm vessel patency, evaluate tissue perfusion, and identify compromised circulation. A finding that blood flow is present and appropriately directed can support confidence in the repair or treated region, whereas an abnormal pattern can signal a possible complication. These assessments help inform decisions before the surgical site is closed.