Validation of a volumic reconstruction in 4-d echocardiography and gated spect using a dynamic cardiac phantom

Nguyen, Long-Dang; Léger, Christophe; Debrun, D.; Therain, F.; Visser, Jelle; Sokole, Ellinor Busemann

doi:10.1016/s0301-5629(03)00975-x

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…Most existing heart phantoms incorporate a sophisticated dynamic actuation (22)(23)(24)(37)(38)(39). Most existing heart phantoms incorporate a sophisticated dynamic actuation (22)(23)(24)(37)(38)(39).…”

Section: Discussionmentioning

confidence: 99%

“…As it is currently implemented, our test bench with its heart phantoms has certain limitations. Most existing heart phantoms incorporate a sophisticated dynamic actuation (22)(23)(24)(37)(38)(39). As we focus on the end-diastolic LV volume, our testing environment has the highest clinical relevance, if the models are derived from end-diastolic data and remain static.…”

Section: Discussionmentioning

confidence: 99%

“…Anatomically detailed heart phantoms were manufactured using a 3D printing, lost-wax casting technique (26) to mimic the trabeculae carneae, the papillary muscles, and the heterogeneous wall thicknesses (see Figure 2). The silicone casting technique yielded highly elastic, durable heart phantoms consisting of a material that has previously been used to test ultrasonic systems (23,27). The thoracic computer tomography (CT) scans of 20 patients with a condition of dilated cardiomyopathy that we used were recorded by the German Heart Center Berlin.…”

Section: Heart Phantomsmentioning

confidence: 99%

“…While porcine models generally perform well for testing hemodynamics; unfortunately, this is not the case for the LV morphology. The trabeculae carneae as well as the papillary muscles need to be replicated more accurately than current existing heart phantoms allow (20)(21)(22)(23)(24), which shows the need for the use of an advanced additive manufacturing technique (25)(26)(27). In the human LV, the ultrasonic beam encounters complex reflection and refraction patterns at the intra-ventricular surface.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic sensor concept to fit a ventricular assist device cannula evaluated using geometrically accurate heart phantoms

et al. 2018

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Future left ventricular assist devices (LVADs) are expected to respond to the physiologic need of patients; however, they still lack reliable pressure or volume sensors for feedback control. In the clinic, echocardiography systems are routinely used to measure left ventricular (LV) volume. Until now, echocardiography in this form was never integrated in LVADs due to its computational complexity. The aim of this study was to demonstrate the applicability of a simplified ultrasonic sensor to fit an LVAD cannula and to show the achievable accuracy in vitro. Our approach requires only two ultrasonic transducers because we estimated the LV volume with the LV end-diastolic diameter commonly used in clinical assessments. In order to optimize the accuracy, we assessed the optimal design parameters considering over 50 orientations of the two ultrasonic transducers. A test bench was equipped with five talcuminfused silicone heart phantoms, in which the intra-ventricular surface replicated papillary muscles and trabeculae carnae. The end-diastolic LV filling volumes of the five heart phantoms ranged from 180 to 480 mL. This reference volume was altered by ±40 mL with a syringe pump. Based on the calibrated measurements acquired by the two ultrasonic transducers, the LV volume was estimated well. However, the accuracies obtained are strongly dependent on the choice of the design parameters.Orientations toward the septum perform better, as they interfere less with the papillary muscles. The optimized design is valid for all hearts. Considering this, the Bland-Altman analysis reports the LV volume accuracy as a bias of ±10% and limits of agreement of 0%-40% in all but the smallest heart. The simplicity of traditional echocardiography systems was reduced by two orders of magnitude in technical complexity, while achieving a comparable accuracy to 2D echocardiography requiring a calibration of absolute volume only. Hence, our approach exploits the established benefits of echocardiography and makes them applicable as an LV volume sensor for LVADs. K E Y W O R D Scardiac phantom, 3D printing, trabeculae, volume sensor, ultrasound, implantable, intra-cardiac echocardiography, ventricular assist device, hemodynamic monitoring 468 | DUAL et al.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Heart Phantomsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultrasonic sensor concept to fit a ventricular assist device cannula evaluated using geometrically accurate heart phantoms

et al. 2018

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“…A number of anthropomorphic cardiac ultrasound phantoms have been proposed in the past. [26][27][28][29][30][31][32][33][34] The anthropomorphic cardiac phantom developed and employed in this study provided a simple anatomic representation of an adult human LV. More precisely, the phantom consisted of a cup-shaped (prolate-ellipsoid) tissue mimicking material (TMM) model of an adult human LV positioned along the elevation plane within a bloc of agar-based gelatin (Figure 1).…”

Section: Anthropomorphic Left Ventricle Phantommentioning

confidence: 99%

Elevational spatial compounding for enhancing image quality in echocardiography

et al. 2016

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IntroductionEchocardiography is commonly used in clinical practice for the real-time assessment of cardiac morphology and function. Nevertheless, due to the nature of the data acquisition, cardiac ultrasound images are often corrupted by a range of acoustic artefacts, including acoustic noise, speckle and shadowing. Spatial compounding techniques have long been recognised for their ability to suppress common ultrasound artefacts, enhancing the imaged cardiac structures. However, they require extended acquisition times as well as accurate spatio-temporal alignment of the compounded data. Elevational spatial compounding acquires and compounds adjacent partially decorrelated planes of the same cardiac structure.MethodsThis paper employs an anthropomorphic left ventricle phantom to examine the effect of acquisition parameters, such as inter-slice angular displacement and 3D sector angular range, on the elevational spatial compounding of cardiac ultrasound data.Results and conclusionElevational spatial compounding can produce substantial noise and speckle suppression as well as visual enhancement of tissue structures even for small acquisition sector widths (2.5° to 6.5°). In addition, elevational spatial compounding eliminates the need for extended acquisition times as well as the need for temporal alignment of the compounded datasets. However, moderate spatial registration may still be required to reduce any tissue/chamber blurring side effects that may be introduced.

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New Advances in Genitourinary Ultrasound

Christensen

Dogra

2007

Ultrasound Clinics

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Validation of a volumic reconstruction in 4-d echocardiography and gated spect using a dynamic cardiac phantom

Cited by 10 publications

References 28 publications

Ultrasonic sensor concept to fit a ventricular assist device cannula evaluated using geometrically accurate heart phantoms

Ultrasonic sensor concept to fit a ventricular assist device cannula evaluated using geometrically accurate heart phantoms

Elevational spatial compounding for enhancing image quality in echocardiography

New Advances in Genitourinary Ultrasound

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