On the relationship between power mode and pressure amplitude decorrelation
Abstract
Estimation of mean transit time, along with tissue blood volume, are important factors in determining soft tissue perfusion. Recently, power mode decorrelation techniques have been successfully used to estimate mean transit time of red blood cells or contrast material through a region-of-interest (ROI) both in laminar flow phantoms and in vivo. The previously described theory for power mode decorrelation derives from a phenomenological stochastic differential equation (Langevin equation) based on conservation of matter, relating the detected signal power to the measured rate of decorrelation. Given the experimental support for power mode decorrelation as a method to estimate mean transit time, it becomes important to determine the relationship between the phenomenological parameters that appear in the corresponding stochastic equation and system parameters, such as the transducer point response function. With this equation as a starting point, and using the fact that the pressure amplitude is a Gaussianly distributed random process, the following stochastic differential equation for the pressure amplitude p(t) is derived, a necessary first step in establishing the relationship between the measured decorrelation rate and system parameters (i.e., point response function): dp(t)/dt = -(v/2+2ik x v)p(t)+f(t), where v/2 represents the rate of decorrelation, 2k x v is the Doppler shift for an insonating wave vector k and particle velocity v.f(t) is a stationary, white noise Gaussian random process.
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Numerous attempts to directly image the spiral arteries within the myometrium have generated conflicting data.
“Numerous attempts have been made to directly image the spiral arteries within the myometrium but this has generated conflicting data [51–56].”
From Volume and vascularity: Using ultrasound to unlock the secrets of the first trimester placenta (2019) · cites this paper as [56]
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Collins, S. L., Stevenson, G. N., Noble, J. A., Impey, L., & Welsh, A. W. (2012) · Ultrasound in Obstetrics & Gynecology · doi:10.1002/uog.10122 · Cited by 52 · see citing works
Volume and vascularity: Using ultrasound to unlock the secrets of the first trimester placenta
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- Authors
- Adler, R. S.
- Affiliations
- Hospital for Special Surgery (US)
- Corresponding author
- Adler, Ronald S
- ORCID
- Adler, Ronald S
- Venue
- Ultrasound in Medicine & Biology
- Publisher
- Elsevier BV
- Published
- 2001-09
- Volume
- 27
- Issue
- 9
- Pages
- 1291-1296
- ISSN
- 0301-5629 (ISSN-L)
- OpenAlex
- W1980188806
- Cited by
- 6
- References
- 25
- Citations by year
- 2026: 1 · 2019: 1 · 2017: 1
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Ultrasound in Medicine & Biology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Ultrasound Imaging and Elastography
- Physical Sciences › Engineering › Biomedical Engineering › Photoacoustic and Ultrasonic Imaging
- Physical Sciences › Engineering › Biomedical Engineering › Ultrasound and Hyperthermia Applications
- Keywords
- mean transit time, tissue blood volume, stochastic differential equations, Langevin equation, point response function, Doppler shift, Gaussian processes, white noise, red blood cell flow, contrast-enhanced ultrasound
- MeSH terms
- Blood Pressure, Blood Volume, Cardiovascular Diseases, Humans, Mathematical Computing, Stochastic Processes, Ultrasonography
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