Pulsed doppler echocardiography: Principles and applications

Baker, Donald W.; Rubenstein, Simeon A.; Lorch, Gerald S.

doi:10.1016/0002-9343(77)90119-x

Cited by 128 publications

(20 citation statements)

References 5 publications

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“…In the ED investigation a 5-MHz sector echocardiograph was used in combination with a range gated pulsed Doppler system [3,4] (ATL Mark V) . With sector echocardiography, a twoSupported by the Dutch Heart Foundation Address reprint requests to : 0 .…”

Section: Methodsmentioning

confidence: 99%

Doppler flow characteristics in the main pulmonary artery and the $$\overline {LA} /Ao$$ ratio before and after ductal closure in healthy newborns/Ao ratio before and after ductal closure in healthy newborns

Daniëls¹,

Hopman²,

Stoelinga³

et al. 1982

Pediatr Cardiol

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Echo-Doppler (ED) techniques were used to estimate the time of closure of the ductus arteriosus in 30 normal neonates. We found that after birth there was a left-to-right (L-R) shunt through the ductus, which disappeared within 14 hours in 50% of the neonates investigated. Furthermore, patency of the ductus was not associated with a murmur. After closure of the ductus there was a significant diminution of the echocardiographically determined left atrium/aortic (LA/Ao) ratio, which was used as a measure of the L-R shunt.

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Section: Methodsmentioning

confidence: 99%

Doppler flow characteristics in the main pulmonary artery and the $$\overline {LA} /Ao$$ ratio before and after ductal closure in healthy newborns/Ao ratio before and after ductal closure in healthy newborns

Daniëls¹,

Hopman²,

Stoelinga³

et al. 1982

Pediatr Cardiol

View full text Add to dashboard Cite

show abstract

“…Also, the area of the beam overlap region in vTDI changes with varying beam focus depths 32 , potentially affecting the velocity estimates. The variance of the Doppler estimates depend upon (1) acceleration and deceleration of tissue within the analysis time window (2) variance of tissue velocity within the Doppler range gate (3) the varying Doppler angle within the aperture used for Wideband spectral the transmitted and received ultrasound beams, also known as geometric broadening 33 and (4) the bandwidth of reduce the variance due to the pulse bandwidth. In the case of vTDI, which utilizes two steered Doppler beams, the variance of tissue velocities in the beam-overlap region relative to the muscle is another factor to consider.…”

Section: Discussionmentioning

confidence: 99%

A Novel Application of Musculoskeletal Ultrasound Imaging

Eranki

Cortés

Ferencek

et al. 2013

JoVE

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Ultrasound is an attractive modality for imaging muscle and tendon motion during dynamic tasks and can provide a complementary methodological approach for biomechanical studies in a clinical or laboratory setting. Towards this goal, methods for quantification of muscle kinematics from ultrasound imagery are being developed based on image processing. The temporal resolution of these methods is typically not sufficient for highly dynamic tasks, such as drop-landing. We propose a new approach that utilizes a Doppler method for quantifying muscle kinematics. We have developed a novel vector tissue Doppler imaging (vTDI) technique that can be used to measure musculoskeletal contraction velocity, strain and strain rate with sub-millisecond temporal resolution during dynamic activities using ultrasound. The goal of this preliminary study was to investigate the repeatability and potential applicability of the vTDI technique in measuring musculoskeletal velocities during a drop-landing task, in healthy subjects. The vTDI measurements can be performed concurrently with other biomechanical techniques, such as 3D motion capture for joint kinematics and kinetics, electromyography for timing of muscle activation and force plates for ground reaction force. Integration of these complementary techniques could lead to a better understanding of dynamic muscle function and dysfunction underlying the pathogenesis and pathophysiology of musculoskeletal disorders.

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“…Details concerning the method can be found elsewhere. [4][5][6][7][8][9] The patients were examined in the supine position, with the transducer located in the third or fourth intercostal space at the left sternal margin, as in conventional echocardiography.11 Suprasternal notch echocardiograms were obtained according to the Goldberg method.1" The beam was directed inferiorly and slightly leftward to vizualize the transverse aortic arch and right pulmonary artery. An example of normal flow in these structures is presented in figure 3.…”

Section: Methodsmentioning

confidence: 99%