Medical Ultrasound
Medical Ultrasound - Related Videos
08:21
Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Cited by 4 •
2014
Optical detection of ultrasound is impractical in many imaging scenarios because it often requires stable environmental conditions. We demonstrate an optical technique for ultrasound sensing in volatile environments with miniaturization and sensitivity levels appropriate for optoacoustic imaging in restrictive scenarios, e.g. intravascular applications.
09:00
Murine Echocardiography and Ultrasound Imaging
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Cited by 61 •
2010
This video demonstrates use of a rail-mounted high-frequency ultrasound probe to perform echocardiography on an anesthetized mouse. The methods describe both conventional two-dimensional and M-mode measurements of cardiac function in addition to newer, more powerful tools such as color Doppler, strain analysis, as well as general and targeted contrast imaging.
05:54
MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor
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Cited by 16 •
2017
High-intensity MRI guided focused ultrasound is an emerging noninvasive technique to precisely ablate brain tissue. It has been shown to be safe and effective in treating medically-refractory essential tremor. This article describes the protocol for thalamotomy from patient selection to equipment setup to post-treatment follow-up.
10:53
A Novel Application of Musculoskeletal Ultrasound Imaging
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Cited by 14 •
2013
We describe a new ultrasound-based vector tissue Doppler imaging technique to measure muscle contraction velocity, strain and strain rate with sub-millisecond temporal resolution during dynamic activities. This approach provides complementary measurements of dynamic muscle function and could lead to a better understanding of mechanisms underlying musculoskeletal disorders.
06:59
A Novel Approach for the Administration of Medications and Fluids in Emergency Scenarios and Settings
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Cited by 5 •
2016
This study presents a novel device that offers an easy route to quickly provide medications and fluids in patients with limited or difficult IV access. This small-diameter device is placed in the distal third of the rectum, allowing for ongoing medication and fluids administration.
FAQs
Tissue boundaries return echoes because acoustic impedance changes how much incident sound is reflected. A larger mismatch generally produces a stronger echo, while a smaller mismatch returns less energy to the transducer. The system uses these differences to distinguish adjacent anatomical regions, making impedance contrast central to image formation rather than merely a property of the tissues.
As ultrasound travels through the body, attenuation progressively weakens the sound and the echoes that return from deeper regions. Echo strength therefore reflects both tissue boundaries and energy loss along the path. Recognizing this effect helps explain why image quality can vary with depth and why signal interpretation must account for more than boundary contrast alone.
Doppler analysis uses changes associated with motion in the ultrasound signal to provide information beyond static anatomy. In medical ultrasound, this physics supports assessment of tissue function and is especially relevant to studies of the heart and blood vessels. It extends imaging from locating structures to examining how motion contributes to physiological assessment.
Refraction changes the path of a sound wave when it crosses an interface, so the returning signal may not follow the original direction of travel. Along with reflection, this behavior influences how ultrasound energy reaches structures and returns to the transducer. Understanding both effects is important when relating detected echoes to anatomical position.
The instrument records when each echo returns and how strong it is. Return time supplies information related to the location of the reflecting boundary, while signal strength indicates the prominence of that response. A computer combines these measurements into a visual representation, allowing operators to examine anatomical structures in real time rather than relying on a single detected signal.
Its applications span fetal imaging, cardiac assessment, vascular studies, and guidance for procedures. The appropriate use depends on whether the goal is to visualize anatomy, assess function, examine vascular structures, or support procedural targeting. Because the method provides real-time information without ionizing radiation, it is suited to situations requiring immediate visualization.
It provides a practical setting for studying wave propagation, reflection, refraction, attenuation, and Doppler effects in a living body. Each phenomenon connects a measurable signal to anatomical structure or function: propagation carries pulses, interface behavior creates echoes, attenuation changes signal strength, and Doppler effects add motion-related information. This makes the technique directly relevant to applied physics.