Early and recent intraluminal ultrasound devices

Bom, N.; Hoff, H. ten; Lancée, C.T.; Gussenhoven, W. J.; Bosch, Johannes G.

doi:10.1007/978-94-009-1007-2_1

Cited by 32 publications

(16 citation statements)

References 10 publications

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“…With the advances in integrated circuits, it was possible to construct IVUS array catheter small enough to be situated in coronary arteries [2], [3]. For many years, IVUS has been used for various clinical purposes because it provides real-time cross-sectional images of blood vessels at high spatial resolution [4]- [8].…”

Section: Introductionmentioning

confidence: 99%

Decorrelation characteristics of transverse blood flow along an intravascular array catheter

Lupotti

Cespedes²,

Steen

2000

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In recent years, a new method to measure transverse blood flow based on the decorrelation of radio frequency (RF) signals has been introduced. In this paper, we investigated the decorrelation characteristics of transverse blood flow measurement using an intravascular ultrasound (IVUS) array catheter by means of computer modeling. Blood was simulated as a collection of randomly located point scatterers. Moving this scattering medium transversally across the acoustical beam represented flow. First-order statistics were evaluated, and the signal-to-noise ratio from the signals was measured. The correlation coefficient method was used to present the results. The decorrelation patterns for RF and for RF-envelope signals were studied. The decorrelation patterns from the RF signals were in good agreement with those obtained from theoretical beam profiles. This agreement suggests that the decorrelation properties of an IVUS array catheter for measuring quantitative transverse blood flow can be assessed by measuring the ultrasound beam. A line of point scatterers, moved transversally across the acoustical beam (line spread function), can determine this decorrelation behaviour.

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Section: Introductionmentioning

confidence: 99%

Decorrelation characteristics of transverse blood flow along an intravascular array catheter

Lupotti

Cespedes²,

Steen

2000

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…The Doppler shift may for example be at its maximum when the beam is Spectrum Broadening: The power spectrum from blood is subject to a frequency broadening due to reduced transit time through the sample volume as the blood velocity increases. Frequency broadening and Doppler shift can be described separately since the echo signal response (see (2)) is separable in range and angle. First consider no beam tilting: The transit time for scatterers that do not move relative to the catheter is determined by the beam profile and the velocity of the sample volume:…”

Section: Blood Velocitiesmentioning

confidence: 99%

Blood noise reduction in intravascular ultrasound imaging

Grønningsaeter

Angelsen

Gresli³

et al. 1995

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Scattering from red blood cells (blood noise) increases significantly as the ultrasound frequency is increased above 10 MHz. This reduces the contrast between the vessel wall and the lumen in intravascular ultrasound imaging which makes it difficult to localize the vessel wall and plaque. A blood noise filter based on beam tilting and digital lateral low pass filtering is described. Beam tilting introduces a Doppler shift from blood which results in a frequency separation of the vessel wall signal and the blood noise. The performance of the filter is investigated by simulations and by in vitro experiments. The filter is found to be effective for blood velocities exceeding approximately 50 cm s 01 at a 20 MHz ultrasound frequency with a beam tilt angle of 10 degrees and a frame rate of 15 f.p.s. By increasing the system frequency to 40 MHz, increase the beam tilt angle to 15 degrees and reduce the frame rate to 10 f.p.s., the filter is effective for blood velocities below 10 cm s 01 .

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“…In 1969 a 32-element phased-array coil was developed by Bom and coworkers [4,5]. In the 1980s, ICE was used in the clinical setting for the visualization of the coronary arteries by Pandian et al [26].…”

Section: Introductionmentioning

confidence: 99%

The Use of Intracardiac Echocardiography During Percutaneous Pulmonary Valve Replacement

et al. 2014

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High-quality live imaging assessment of cardiac valves and cardiac anatomy is crucial for the success of catheter-based procedures. We present our experience using Intracardiac echocardiography (ICE) during transcatheter Percutaneous Pulmonary Valve replacement (tPVR).This is a retrospective study that included 35 patients who underwent tPVR between April 2008 and June 2012. Thirty-one of these patients had the procedure performed under continuous ICE guidance. Pre-procedure transthoracic echocardiography (TTE) was obtained in all patients. ICE was performed at baseline, during the procedure, and at the conclusion of the procedure. Comparisons between the pre-procedure TTE and baseline ICE data and between post-procedure ICE data and the following day TTE were performed. Total of 35 patients had tPVR during the above-mentioned time period. Twenty-one patients received the Edwards Sapien valve and 14 patients had the Melody valve. Thirty-one patients had the procedure performed under continuous ICE guidance. The mean Pre-TTE peak gradient (PG) and Pre-ICE-PG were 45.5 ± 20 vs 33 ± 13 mmHg (p < 0.001) and the mean Pre-TTE mean gradient (MG) and Pre-ICE-MG were 27.7 ± 13 vs 21 ± 18 mmHg (p < 0.001). The mean Post-TTE- PG and Post-ICE-PG were 24.3 ± 11 vs 15.3 ± 7 mmHg (p < 0.001) and the mean of the Post-TTE-MG and Post-ICE-MG were 14.2 ± 7 vs 8.4 ± 4 mmHg (p < 0.001). There was a good correlation between peak ICE and TTE gradient at baseline and after valve placement. For the degree of pulmonary regurgitation, there was no significant difference between TTE and ICE. ICE is an important modality to guide tPVR in patients with dysfunctional homograft valve between the right ventricle and pulmonary artery and should be used to assess valve function before, during and immediately after the procedure.

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Early and recent intraluminal ultrasound devices

Cited by 32 publications

References 10 publications

Decorrelation characteristics of transverse blood flow along an intravascular array catheter

Decorrelation characteristics of transverse blood flow along an intravascular array catheter

Blood noise reduction in intravascular ultrasound imaging

The Use of Intracardiac Echocardiography During Percutaneous Pulmonary Valve Replacement

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