Importance of angle corection in transcranial color-coded duplex insonation of arteries at the base of the brain

Lepic, Toplica; Veljancić, D; Jovanikic, Olivera; Lepić, Milan; Slankamenac, Petar; Raicević, R

doi:10.2298/vsp141105009l

Cited by 7 publications

(7 citation statements)

References 11 publications

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“…One of the most notable advantages of CBCT over blind Doppler is that the direction of blood ow can be precisely known and thus align the ultrasound beam as close as possible to an angle of zero degrees with respect to the direction of the erythrocytes, obtaining the velocities with great precision [19], [20], [21], [23]. DCT not only has the advantage of obtaining accurate blood ow velocities in the vessels of the polygon of Willis but also provides information about any structural or pathophysiological anatomical alteration of the skull base vessels [20].…”

Section: Discussionmentioning

confidence: 99%

Utility of the Color-Coded Duplex Neurosonographic Spectrum in Critically Ill Children in Resource-Limited Centers: A Case Series

Caqui-Vilca

Domínguez-Rojas

Ponce³

et al. 2021

Preprint

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Ultrasound in pediatric neurocritical care has a wide variety of indications, such as the study of vasospasm in subarachnoid hemorrhage, flow changes in intracranial stenosis, endocranial hypertension and to evaluate some therapeutic measures. The following is a series of five most relevant cases collected from Pediatric Intensive Care with abnormal images in transcranial duplex (TCD) and their typical findings in this type of studies. Transcranial duplex offers a diagnostic method of rapid evaluation that provides reliable information for decision making in pediatric intensive care, but it is a tool with which there is little experience in the country, so these findings are didactic and should be complemented with studies of greater diagnostic relevance.

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Section: Discussionmentioning

confidence: 99%

Utility of the Color-Coded Duplex Neurosonographic Spectrum in Critically Ill Children in Resource-Limited Centers: A Case Series

Caqui-Vilca

Domínguez-Rojas

Ponce³

et al. 2021

Preprint

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“…Results from our study exhibited the discontinuity within our small sample similar to that found in the literature. The inability to unite a common method has led to significantly varied results . A multisite vascular network demonstrated there were still inconsistencies in Doppler angle methods showing the systemic spread of discontinuity into specialist communities .…”

Section: Discussionmentioning

confidence: 99%

“…The inability to unite a common method has led to significantly varied results. 8,10,[14][15][16]20 A multisite vascular network demonstrated there were still inconsistencies in Doppler angle methods showing the systemic spread of discontinuity into specialist communities. 20 They stressed the importance of implementing and unifying scanning protocols to reduce error and intersite variations.…”

Section: Discussionmentioning

confidence: 99%

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What is the more common method of obtaining velocity measurements in carotid artery studies: a 60° insonation angle versus a convenient insonation angle?

Cassin

Quinton

2018

Sonography

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Introduction Stenosis of the internal carotid arteries (ICAs) increases the risk of stroke. ICA stenosis is routinely assessed with Doppler ultrasound. The current need for diagnostic imaging accuracy and unity is invaluable. Limits are in place to complete ultrasound examinations using insonation angles of 60° or less. The diagnostic community is separated into two groups: (1) those that use a constant 60° angle and (2) those that use an angle of 60° or less. Methods A pilot study was undertaken where a survey was circulated throughout a single private company with 19 sonographers of varying experience participating. The aim was to evaluate the most common method of ICA Doppler insonation used. Results Results depicted discontinuity among sonographers with 52.6% utilising a constant Doppler angle of 60° and 47.4% using a convenient angle. Eighty percent with >10 years use a convenient angle, 80% with 5 to 10 years use a constant 60°, and sonographers with 1 to 5 years' experience were more evenly split with 43% utilising a constant 60° and 57% using a convenient angle. Discussion Trends between experience and method were established. Further research with larger numbers to ascertain why sonographers choose a particular method is warranted.

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“…The insonation angle consideration is indispensable in evaluation of normal values, physiological variations, as well as in the evaluation of pathological findings of blood flow velocities in Doppler examination 6,7 . Inappropriate Dopplersonographic measurement may lead to the false satisfactory results, due to the insonation angle differences between examinations, leading to the oversight of the blood flow disturbance, or deeming the altered blood flow appropriate 8 .…”

Section: Introductionmentioning

confidence: 99%

Insonation angle impact on micro-Doppler evaluation in cerebrovascular surgery: technical note

et al. 2023

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Introduction: The insonation angle consideration is important in the Doppler-sonographic evaluation of blood flow velocities and volume, however, the concept is rarely applied to the intraoperatively used micro-Doppler.This technical note aims to emphasize the possibility and necessity of insonation angle correction and preservation for the blood flow assessment in cerebrovascular surgery.Methods: Bi-directional surgical Doppler with a 20MHz flexible bayonet 1.2mm diameter probe was used for the intraoperative blood flow assessment, with the variable insonation angle on the straight parts of the arteries, and the results were recorded to demonstrate the importance.Results: The measurements performed confirmed that the blood flow features, including the direction, velocity, and especially the volume, are highly susceptible to the insonation angle variations. Although there were significant alterations, positioning the probe at an angle of ~60 degrees resulted in the variable but less altering measurements.Conclusion: Positioning the probe at ~60 degrees is desirable; however, it appears that it is even more important to maintain the same insonation angle and probe position when assessing the vessels repeatedly for blood flow alterations that might occur in the course of cerebrovascular surgery.

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Importance of angle corection in transcranial color-coded duplex insonation of arteries at the base of the brain

Cited by 7 publications

References 11 publications

Utility of the Color-Coded Duplex Neurosonographic Spectrum in Critically Ill Children in Resource-Limited Centers: A Case Series

Utility of the Color-Coded Duplex Neurosonographic Spectrum in Critically Ill Children in Resource-Limited Centers: A Case Series

What is the more common method of obtaining velocity measurements in carotid artery studies: a 60° insonation angle versus a convenient insonation angle?

Insonation angle impact on micro-Doppler evaluation in cerebrovascular surgery: technical note

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