Recently Gizon, Duvall, and Schou (2002) suggested that supergranulation has a wave-like component. In this paper I show that the same phenomenon can be observed using surface Doppler shift data, thereby confirming their observations. I am also able to measure the dispersion relation to lower wavenumbers and to extend the results for rotation and meridional flows beyond ±70 • latitude.

Scattering of electromagnetic waves by turbulence is considered. It is shown that Doppler velocity (the ratio of Doppler shift and Bragg wave number) includes two terms: The first is the mean radial velocity in the scattering volume, and the second is what we call the “correlation velocity,” caused by a correlation between the fluctuations of velocity and those of refractive index. The correlat...

Laser Doppler flowmetry (LDF) and laser speckle contrast analysis (LASCA) both utilize the spatiotemporal properties of laser speckle patterns to assess microcirculatory blood flow in tissue. Although the techniques analyze the speckle pattern differently, there is a close relationship between them. We present a theoretical overview describing how the LDF power spectrum and the LASCA contrast c...

This article describes uterine and uterine cavity changes throughout the normal and pathological puerperium, as revealed by various ultrasound modalities. A gray scale ultrasound, color and pulsed Doppler ultrasound and 3D ultrasound were used. It is based on results of several prospective longitudinal studies, which were designed so that every woman was examined at six occasions during the pue...

Introduction: A favorable endometrium is the essential requirement for implantation. The aim of this study was to determine the predictive value of endometrial power Doppler ultrasonographic parameters in predicting the success of implantation in patients undergoing IVF and ICSI cycles. Methods: Seventy three patients aged<38 years with basal serum FSH level<12 , who had not more than two faile...

The achievement of adequate and prompt myocardial reperfusion in acute myocardial infarction (AMI) is the most important determinant of recovery of ventricular function at follow-up. This explains the great attention given to the so-called no-reflow phenomenon, which is associated with extensive myocardial damage and a high prevalence of future cardiac events after AMI. The no-reflow phenomenon...

OBJECTIVE This study aimed to investigate the influence of injection rates of calibrating standard solution on monitoring pulse indicator continuous cardiac output (PICCO, made in Germany), and thereby to provide significant references for clinical practice. METHODS A total of 108 critical patients in stroke intensive care unit were identified. All these participants received transesophageal ...

BACKGROUND Abernethy malformation is a rare congenital vascular abnormality in which the portal vein bypasses the liver and drains directly into the inferior vena cava. Diagnosis is complex and requires good quality imaging methods to identify details in systemic and portal circulation in order to establish diagnostic confirmation and treatment strategy. In this study we highlight the significa...

BACKGROUND Heart rate assessment immediately after birth in newborn infants is critical to the correct guidance of resuscitation efforts. There are disagreements as to the best method to measure heart rate. OBJECTIVE The aim of this study was to assess different methods of heart rate assessment in newborn infants at birth to determine the fastest and most accurate method. METHODS PubMed, EM...

From the flow of a suspension of micrometer-scale carbon particles, the photoacoustic Doppler shift is observed. As predicted theoretically, the observed Doppler shift equals half of that in Doppler ultrasound and does not depend on the direction of laser illumination. This new physical phenomenon provides a basis for developing photoacoustic Doppler flowmetry, which can potentially be used for...