Power Doppler US: a potentially useful alternative to mean frequency-based color Doppler US.

Rubin, Jonathan M.; Bude, Ronald O.; Carson, Paul L.; Bree, Robert L.; Adler, Ronald S.

doi:10.1148/radiology.190.3.8115639

Cited by 831 publications

(477 citation statements)

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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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“…However, color Doppler US does not detect pulsatile flow in some HCCs. The reasons for this are as follows: first, color Doppler US cannot detect flows that are perpendicular to the sound field [182]. Second, the technique uses an estimate of the mean Doppler frequency shift at a particular position.…”

Section: Combination Of Tumor Markersmentioning

confidence: 99%

“…On the contrary, power Doppler imaging measures the Doppler energy, which is based on the integrated power of the Doppler signal instead of its mean Doppler frequency shift. Some studies reported that power Doppler sonography was more sensitive for the depiction of blood vessels than color Doppler imaging [182,183]. These techniques are noninvasive and inexpensive; however, they have some limitations including a low sensitivity of detecting the microflow in the nodules.…”

Section: Combination Of Tumor Markersmentioning

confidence: 99%

Asian Pacific Association for the Study of the Liver consensus recommendations on hepatocellular carcinoma

et al. 2010

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Introduction The Asian Pacific Association for the Study of the Liver (APASL) convened an international working party on the management of hepatocellular carcinoma (HCC) in December 2008 to develop consensus recommendations. Methods The working party consisted of expert hepatologist, hepatobiliary surgeon, radiologist, and oncologist from Asian-Pacific region, who were requested to make drafts prior to the consensus meeting held at Bali, Indonesia on 4 December 2008. The quality of existing evidence and strength of recommendations were ranked from 1 (highest) to 5 (lowest) and from A (strongest) to D (weakest), respectively, according to the Oxford system of evidence-based approach for developing the consensus statements. 123Hepatol Int (2010) 4: 439-474 DOI 10.1007/s12072-010-9165-7 Results Participants of the consensus meeting assessed the quality of cited studies and assigned grades to the recommendation statements. Finalized recommendations were presented at the fourth APASL single topic conference on viral-related HCC at Bali, Indonesia and approved by the participants of the conference.

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“…The frequency shift is determined by the movement of red blood cells, whereas the amplitude is governed by the amount of moving blood present within the volume sampled by the ultrasound beam. 11 The fast Fourier transformation waveforms of blood¯ow signals obtained with power Doppler ultrasonography were analyzed. Pulsatile¯ow wave signals were received, and maximal, minimal, and mean velocity (Vmax, Vmin, and Vmean, respectively) were determined.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of spinal cord blood flow during prostaglandin E1-induced hypotension with power Doppler ultrasonography

et al. 2001

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Study design: Intraoperative power Doppler ultrasonography was used to evaluate the spinal cord blood¯ow in cervical spondylotic myelopathy patients during hypotensive anesthesia. Objective: To evaluate the e ect of prostaglandin E1 (PGE1) induced hypotension on spinal cord blood¯ow (SBF) during spinal surgery. Summary and background data: Hypotension is frequently induced to decrease blood loss during surgery and to diminish the need for blood transfusion. Prostaglandin E1 (PGE1) is reported to maintain cerebral, liver, and renal blood¯ow during surgery. However, there are few reports on spinal cord blood¯ow. Methods: Eleven patients underwent laminoplasty for cervical spondylotic myelopathy. After a French door type laminoplasty was carried out, hypotension was induced with PGE1. Before and during hypotension, we evaluated blood¯ow in the anterior spinal cord artery by determining the pulsatility index (PI) and resistance index (RI) using power Doppler ultrasonography. Results: Before hypotension, the mean blood pressure was 80 mmHg. The blood pressure decreased to 60 mmHg using PGE1 (P50.01), although the PI and RI were signi®cantly higher than before hypotension (PI, P=0.0076 RI, P=0.02). Conclusion: The pulsatility and resistance indices during hypotension were signi®cantly higher than before hypotension, suggesting that the autoregulation of the anterior spinal cord artery and anterior spinal cord blood¯ow were maintained with hypotension using PGE1. Prostaglandin E1 may be a useful drug for hypotensive anesthesia in spinal surgery. Spinal Cord (2001) 39, 31 ± 36

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Power Doppler US: a potentially useful alternative to mean frequency-based color Doppler US.

Abstract: PD is a new CD imaging imaging mode that might be superior to CD in some cases.

Cited by 831 publications

References 0 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

Asian Pacific Association for the Study of the Liver consensus recommendations on hepatocellular carcinoma

Evaluation of spinal cord blood flow during prostaglandin E1-induced hypotension with power Doppler ultrasonography

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