Ultrasound A Scan
Ultrasound A Scan - Related Videos
07:34
Delivery of Antibodies into the Brain Using Focused Scanning Ultrasound
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Cited by 6 •
2020
Presented here is a protocol to transiently open the blood-brain barrier (BBB) either focally or throughout a mouse brain to deliver fluorescently-labeled antibodies and activate microglia. Also presented is a method to detect the delivery of antibodies and microglia activation by histology.
14:20
High-frequency Ultrasound Imaging of the Abdominal Aorta
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2023
Source: Amelia R. Adelsperger, Evan H. Phillips, and Craig J. Goergen, Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana High-frequency ultrasound systems are used to acquire high resolution images. Here, the use of a state-of-the-art system will be demonstrated to image the morphology and hemodynamics of small pulsatile arteries and veins found in mice and rats. Ultrasound is a relatively inexpensive, portable, and versatile method for the noninvasive...
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.
09:26
Transabdominal Ultrasound for Pregnancy Diagnosis in Reeves' Muntjac Deer
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Cited by 2 •
2014
Transabdominal ultrasound is described as an effective, noninvasive means for assessing reproductive status in Reeves' muntjac deer. These methods can be used to achieve early pregnancy diagnosis and to evaluate fetal viability. Future applications of this technique include estimation of gestational age and effects of maternal disease on fetal development.
02:28
Leaky Scanning
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2020
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
FAQs
The displayed spikes represent echoes returning from boundaries between internal ocular structures. Their timing indicates how far the sound traveled before returning, while their amplitude reflects the strength of the detected echo. Together, these features help identify structural interfaces and support measurement of distances within the eye rather than producing a conventional two-dimensional image.
Sound velocity provides the conversion factor between echo travel time and physical distance. The system combines the measured time for an echo to return with the assumed velocity of sound through the eye to calculate ocular dimensions. If velocity is not appropriately incorporated, the resulting measurements, particularly axial length, would not accurately represent the eye's anatomy.
Although axial length is its especially important measurement, amplitude-mode ultrasonography can assess distances between internal ocular structures. The pattern and timing of echoes allow the examiner to evaluate multiple tissue boundaries along the ultrasound path. This one-dimensional information characterizes ocular anatomy and supplies measurements needed for clinical assessment and surgical planning.
An examiner positions the ultrasound probe so high-frequency sound waves can pass through the eye, then records the returning echoes from internal structures. The instrument displays those echoes as spikes, and their travel times are used to calculate ocular distances. The resulting measurements can then be applied to evaluate anatomy or support treatment planning.
A-scan biometry is particularly valuable when dense cataracts or other media opacities limit optical measurements. In these circumstances, ultrasound can still provide ocular dimensions needed for planning. Ophthalmologists use the measurements, especially axial length, when calculating intraocular lens power, helping guide selection of the lens intended for implantation during cataract surgery.
The method supplies ocular measurements, especially axial length, that ophthalmologists use as inputs for intraocular lens power calculation. This connects the physical assessment of eye anatomy with cataract-surgery planning. By providing measurements when optical techniques are limited by media opacity, it supports lens selection in cases where preoperative anatomical assessment would otherwise be more difficult.