Colour Doppler energy (power) mode ultrasound

MacSweeney, J.E.; Cosgrove, David O.; Arenson, J.

doi:10.1016/s0009-9260(96)80155-3

Cited by 58 publications

(36 citation statements)

References 11 publications

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“…However, quantitative assessment of vascularity using CDU has limitations: CDU is less effective than PDU in detecting blood flow at low velocities in microvasculature due to a lower signalto-noise (S/N) ratio; it is prone to alias; CDU is angle dependent and can not detect the blood flow that is close to 90 • to the ultrasound probe (18,19). PDU has a higher S/N ratio, which enables better visualization of the microvasculature, and PDU does not alias and it is angle independent.…”

Section: Discussionmentioning

confidence: 99%

Power Doppler ultrasound assessment of follicular vascularity in the early follicular phase and its relationship with outcome of in vitro fertilization

Shrestha

Costello

Sjöblom

et al. 2006

J Assist Reprod Genet

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Objective : To determine whether ovarian perifollicular blood flow (PFBF) in the early follicular phase (EFP) was associated with treatment outcome. Design : Retrospective longitudinal cohort study. Setting : Tertiary referral centre/university hospital. Patients : Thirty-four women underwent 37 IVF cycles, which resulted in 35 embryo transfers. Interventions : Serial transvaginal scans using power Doppler ultrasound during the follicular phase. Ovarian PFBF of follicles ≥ 5 mm was subjectively assessed using a modified grading system (grades 0-4). Main outcome measures : Ovarian PFBF and pregnancy. Results : Treatment cycles were retrospectively divided into two groups: Group 1 (n = 20) had cycles with at least one small (5-10 mm) or medium (11-14 mm) size follicle(s) of high grade (2-4) PFBF on cycle day 5 or 6 or 7; and Group 2 (n = 17), had cycles that did not. Group 1 had a significantly higher proportion of high grade large follicles in the late follicular phase (35% vs. 21%) (OR 2.0; 95% CI 1.1-3.7) and higher clinical pregnancy rate (47% vs. 12%) (OR 6.3; CI 1.1-35.7) compared to Group 2. Conclusion : High grade ovarian PFBF in the EFP during IVF is associated with both high grade PFBF in the late follicular phase and a higher clinical pregnancy rate.

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Section: Discussionmentioning

confidence: 99%

Power Doppler ultrasound assessment of follicular vascularity in the early follicular phase and its relationship with outcome of in vitro fertilization

Shrestha

Costello

Sjöblom

et al. 2006

J Assist Reprod Genet

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“…Firstly, Balakier et al [28] used CDU to locate follicular vessels and pulsed Doppler to assess velocity profiles or impedance to blood flow whereas our study used PDU which is three-fold more sensitive than conventional CDU at detecting flow with low volumes and velocity, and hence improves the visualization of small vessels such as those surrounding ovarian follicles [29,30]. Secondly, the authors combined the longitudinal data on PFBF into two categorized timeframes: blood flow before and after hCG trigger.…”

Section: Discussionmentioning

confidence: 99%

Power doppler ultrasound assessment of the relationship between age and ovarian perifollicular blood flow in women undergoing in vitro fertilization treatment

Costello

Shrestha

Sjöblom

et al. 2006

J Assist Reprod Genet

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“…Nevertheless, an opaque background makes evaluation of the relationships of the vessels to the surrounding anatomy difficult; flow signals can be presented as lighter hues of the background color or may be assigned to a different, contrasting color. Semitransparent backgrounds have the advantage of allowing identification of the underlying nonvascular structures and thus improve localization of blood vessels but, because the highest gain levels cannot be used, they seem to reduce sensitivity slightly.Power Doppler is almost independent from the beam to vessel angle because it is based on the number of scatterers moving within the vessel, rather than on the frequency shift they generate [2,7]. As long as a Doppler shift is detectable, its power is essentially unaffected by the angle between the US beam and the direction of flow.…”

mentioning

confidence: 99%

Power Doppler sonography: general principles, clinical applications, and future prospects

Martinoli¹,

Derchi²,

Rizzatto

et al. 1998

European Radiology

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Power Doppler sonography (PD) is a technique that displays the strength of the Doppler signal, rather than the flow velocity and directional information. Its increased flow sensitivity and better vascular delineation have been used to document the presence and characteristics of flow in vessels that are poorly imaged with conventional color Doppler (CD), to identify areas of ischemia, to demonstrate inflammatory hyperemia or increased and irregular flow in tumors, as well as to assess serial vascular changes related to interval therapy. The present review reports the general principles of PD, portrays the results of clinical studies available in the literature, and suggests future trends of development.

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Colour Doppler energy (power) mode ultrasound

Cited by 58 publications

References 11 publications

Power Doppler ultrasound assessment of follicular vascularity in the early follicular phase and its relationship with outcome of in vitro fertilization

Power Doppler ultrasound assessment of follicular vascularity in the early follicular phase and its relationship with outcome of in vitro fertilization

Power doppler ultrasound assessment of the relationship between age and ovarian perifollicular blood flow in women undergoing in vitro fertilization treatment

Power Doppler sonography: general principles, clinical applications, and future prospects

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