The “Volumetric” Pulsatility Index as Evaluated by Spatiotemporal Imaging Correlation (STIC): A Preliminary Description of a Novel Technique, Its Application to the Endometrium and an Evaluation of Its Reproducibility

Martins, Wellington P.; Welsh, Alec; Lima, Jailson Costa; Nastri, C.O.; Raine‐Fenning, N.

doi:10.1016/j.ultrasmedbio.2011.08.014

Cited by 39 publications

(63 citation statements)

References 24 publications

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“…Nine volumetric impedance indices were calculated using the following formulae 17 Analyses of VOCAL TM indices were based upon the mean value for a given VOCAL TM index over the cardiac cycle, aiming to mimic standard cardiac cycle-independent VOCAL TM .…”

Section: Regional Variationmentioning

confidence: 99%

“…17 Combining STIC with VOCAL TM has allowed calculation of vascular indices through the cardiac cycle. 15,[17][18][19][20] When plotted on a graph, the sinusoidal pattern generated resembles the waveform seen using pulsed wave Doppler ultrasound. 21 The comparison of vascularity using these indices at different phases of the cardiac cycle allows derivation of 3D volumetric indices (pulsatility index (PI), resistance index (RI) and systolic/diastolic (S/D) ratio).…”

Section: Introductionmentioning

confidence: 99%

“…Further, these indices may overcome one problem of 3D indices by providing some internal standardisation to counteract the influence of machine settings and the cardiac cycle. [17][18][19]23 In this study, we had two aims. [17][18][19]23 In this study, we had two aims.…”

Section: Introductionmentioning

confidence: 99%

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Novel spatial–temporal image correlation derived indices of tissue vascular impedance: A variability study

Ferreira

Stevenson

et al. 2017

Australas J Ultrason Med

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Objectives: 4D (3D + time) indices of tissue impedance using power Doppler (PD) ultrasound (US) can be measured with spatialtemporal image correlation (STIC) imaging. We wished to evaluate their repeatability and their influence under changes to US machine settings and regional differences within the placenta. Methods: A total of 46 healthy women were recruited at 20-34 weeks of gestation. A total of 9940 3D frames from 644 4D data sets were analysed providing both 3D and 4D indices of vascularity. 4D vs. 3D indices were compared with different machine settings, across the cardiac cycle and in the different placenta regions to assess regional variability. Results: 3D and 4D indices significantly decreased as wall motion filter (WMF) was increased (P < 0.001). Repeatability decreased as WMF increased (ICC; low1 = 0.80; high1 = 0.60). Indices were significantly lower at the maternal aspect (P = 0.002-0.009) of the placenta and showed less repeatability (ICC; 0.42-0.79) than the fetal aspect (ICC 0.49-0.88). 4D repeatability was good in the central region (ICC 0.80-0.81) but poor in the periphery (ICC 0.45-0.59), while 3D indices were good and comparable between regions (ICC; 0.80 central; 0.81 peripheral). Conclusions: This study supports the future use of WMF 'low1' and PD to generate more reliable 4D indices values. For 3D indices, HD Flow may improve Doppler signal sensitivity. Regarding placental regional variability, the fetal plate and the central region demonstrated more repeatable 4D indices. 4D PD indices have potential to overcome the limitations of VOCAL TM indices and provide an internally standardised measure of localised impedance in vascular beds.

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Section: Regional Variationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel spatial–temporal image correlation derived indices of tissue vascular impedance: A variability study

Ferreira

Stevenson

et al. 2017

Australas J Ultrason Med

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“…These blocks had different concentrations of glass beads (1.8% and 4.4%) and therefore different coefficients of attenuation: 0.6 dB/MHz/cm ('low attenuation' experiment) and 1.0 dB/MHz/cm ('high attenuation' experiment). The preset 'gynecologic' was used and the following machine settings were maintained for all acquisitions: depth, 4.2 cm; power, 100%; gain, 0.0; WMF, mid1; PRF, 3.2 KHz; 3 (diameter, 9 mm which is greater than the internal diameter of the silicon tube) were assessed with Virtual Organ Computer-aided AnaLysis. Each STIC dataset contained 40 static datasets ('frames') which were sequentially analyzed, using the lowest VFI value as the first 'frame' when constructing graphs of the curves of VFI values through one cardiac cycle; the other frames were ordered consecutively following the order observed in the STIC dataset.…”

Section: Influence Of Attenuation On Three-dimensional Power Doppler mentioning

confidence: 99%

Influence of attenuation on three-dimensional power Doppler indices and STIC volumetric pulsatility index: a flow phantom experiment

Miyague

Pavan

Grillo

et al. 2013

Ultrasound Obstet Gynecol

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“…Some authors have proposed new approaches to overcome this problem, [110][111][112] however, further prospective studies are needed.…”

Section: Notesmentioning

confidence: 99%

Three-dimensional ultrasound in gynecological clinical practice

Alcázar¹,

Aubá²,

Olartecoechea³

2012

RMI

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Three-dimensional ultrasound is an imaging technique that is being introduced into clinical practice in several medical specialties. Although this technique is unlikely to replace the two-dimensional ultrasound, its role as a diagnostic tool is being explored. In fact, in the field of gynecology there has been a steady increase in the number of papers published in the last few years. These applications include: imaging the uterus, uterine cavity, adnexa, and pelvic floor as well as reproductive medicine, such as the prediction of IVF success or ovarian hyperstimulation syndrome. The aim of this paper is to review the current status of threedimensional ultrasound in clinical practice in gynecology.

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The “Volumetric” Pulsatility Index as Evaluated by Spatiotemporal Imaging Correlation (STIC): A Preliminary Description of a Novel Technique, Its Application to the Endometrium and an Evaluation of Its Reproducibility

Cited by 39 publications

References 24 publications

Novel spatial–temporal image correlation derived indices of tissue vascular impedance: A variability study

Novel spatial–temporal image correlation derived indices of tissue vascular impedance: A variability study

Influence of attenuation on three-dimensional power Doppler indices and STIC volumetric pulsatility index: a flow phantom experiment

Three-dimensional ultrasound in gynecological clinical practice

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