Resolution in ultrasound imaging

Ng, Alexander; Swanevelder, Justiaan

doi:10.1093/bjaceaccp/mkr030

Cited by 182 publications

(115 citation statements)

References 6 publications

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“…Lateral resolution depends on the wavelength and the width of the transducer and can be improved by focusing ultrasounds; temporal resolution of Doppler depends on the pulse length, the depth of the structure of interest, and the size of the color box. 66 Since these studies were published, progress has been made in transcranial Doppler imaging, which now shows good agreement with CTA as demonstrated for intracranial vessel localization. 67 Transcranial power Doppler ultrasonography could, therefore, be re-evaluated for intracranial aneurysm imaging.…”

Section: Transcranial Power Doppler Ultrasonographymentioning

confidence: 88%

Intracranial Aneurysms: Wall Motion Analysis for Prediction of Rupture

Vanrossomme

Thiran

Courbebaisse

et al. 2015

AJNR Am J Neuroradiol

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SUMMARY:Intracranial aneurysms are a common pathologic condition with a potential severe complication: rupture. Effective treatment options exist, neurosurgical clipping and endovascular techniques, but guidelines for treatment are unclear and focus mainly on patient age, aneurysm size, and localization. New criteria to define the risk of rupture are needed to refine these guidelines. One potential candidate is aneurysm wall motion, known to be associated with rupture but difficult to detect and quantify. We review what is known about the association between aneurysm wall motion and rupture, which structural changes may explain wall motion patterns, and available imaging techniques able to analyze wall motion.

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Section: Transcranial Power Doppler Ultrasonographymentioning

confidence: 88%

Intracranial Aneurysms: Wall Motion Analysis for Prediction of Rupture

Vanrossomme

Thiran

Courbebaisse

et al. 2015

AJNR Am J Neuroradiol

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“…Although on average men present higher values than women for cTnI and LVM than women, the same cTnI concentrations are present with similar frequency in women and men with great variations in LVM values, especially for concentrations ranging from 1.9 ng/L to 5.2 ng/L, which cover the majority of the population (2294/4139 subjects; 55%) [105]. It is not yet known whether this overlapping is due to true differences between women and men for cardiac structure and/or troponin content, or to some limitations (including performance resolution) in echocardiographic methodology [141,142]. In healthy individuals, echocardiography systematically shows smaller atrial and ventricular dimensions and volumes, and larger wall thickness and mass, then cardiac MRI [141].…”

Section: Clinical Relevance Of Gender-specific Decision Values For Ctmentioning

confidence: 99%

“…It is not yet known whether this overlapping is due to true differences between women and men for cardiac structure and/or troponin content, or to some limitations (including performance resolution) in echocardiographic methodology [141,142]. In healthy individuals, echocardiography systematically shows smaller atrial and ventricular dimensions and volumes, and larger wall thickness and mass, then cardiac MRI [141]. Although cardiac MRI is considered more accurate than echocardiography in the estimation of cardiac LVM, no data are available on the correlations between cardiac mass values measured by cardiac MRI and circulating levels of cTnI and cTnT measured with highly sensitive methods in large populations of healthy adults.…”

Section: Clinical Relevance Of Gender-specific Decision Values For Ctmentioning

confidence: 99%

The 99th percentile of reference population for cTnI and cTnT assay: methodology, pathophysiology and clinical implications

Clerico

Zaninotto

Ripoli

et al. 2017

Clinical Chemistry and Laboratory Medicine (CCLM)

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According to recent international guidelines, including the 2012 Third Universal Definiton of Myocardial Infarction by the Joint ESC/ACCF/AHA/WHF Task Force, an increase in cardiac troponin (cTn) levels over the 99th percentile upper reference limit (99th URL) should be considered clinically relevant, this cut-off being measured with an imprecision ≤10 CV%. In theory 99th URL values strongly depend not only on demographic and physiological variables (i.e. criteria for considering the reference population "healthy"), but also on the analytical performance of cTn methods and mathematical algorithms used for the calculation. The aim of the present article was therefore to review the methodological and pathophysiological factors affecting the evaluation and calculation of the 99th URL for cTn assay. The critical analysis made showed that no uniform procedure is followed, and nor have experts or regulatory bodies provided uniform guidelines for researchers or cTn assays manufacturers as an aid in "their quest to define normality". In particular, little attention has been paid to the way in which a healthy reference population is to be selected, or the criteria for calculating the 99th URL value for cTn assays, thus highlighting the need for international recommendations not only for demographic and physiological variables criteria for defining a healthy reference population, but also for calculating mathematical algorithms for establishing/ calculating clinical decision values. An expert consensus group, comprising laboratory and clinical scientists, biomedical statisticians, industrial and regulatory representatives, should be responsible for drawing up these guidelines.

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“…However, resolving small blood vessels deep in the body is not possible with this technique due to the tradeoff between depth of field and lateral resolution [2]. To improve the echo generation in diagnostic ultrasound imaging, ultrasound contrast agents (UCAs) can be injected into the bloodstream [3]. UCAs are used to enhance the ultrasound signal safely and effectively by increasing the difference in acoustic impedance between the blood and tissue being imaged [4].…”

Section: Introductionmentioning

confidence: 99%