Key result
High-frame-rate echocardiography yields comparable velocities but increases artifact areas by over ~50% versus standard imaging.
Why the study?
Ultrasound color Doppler imaging has limited use for quantitative measures due to low frame rates and measurement bias, and high-frame-rate approaches reduce these limitations at the expense of reduced image quality and penetration depth.
High-frame-rate color Doppler echocardiography achieves significantly higher temporal resolution but currently involves tradeoffs in penetration depth and increased spatial artifacts compared to standard imaging.
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Artifact spread and reduced penetration caution against clinical use of high-frame-rate Doppler; leaves open sequence optimization in future studies.
Ultrasound color Doppler imaging (CDI) provides a map of the axial blood flow velocities in a 2-D/3-D region of interest. While CDI is clinically effective for a qualitative analysis of abnormal blood flows, e.g., for valvular disease in cardiology, it is in limited use for quantitative measures, mainly hampered by low frame rate and measurement bias. These limitations can be reduced by different approaches toward high-frame-rate (HFR) imaging at the expense of reduced image quality and penetration depth. The aim of this study was to compare the impact of different HFR sequences on CDI quantitatively. Different cardiac scan sequences, including diverging waves and multiline transmission, were designed, implemented on a research system, and compared in terms of patient safety parameters, image quality, and penetration depth. Furthermore, in vivo images were acquired and compared for healthy volunteers. Results showed that the HFR techniques spread artifacts on larger areas than the standard single-line scans (> +50%). In addition, due to patient safety limitations, they reduce the penetration depth up to -5 cm. On the other hand, the HFR techniques provide comparable velocity estimates (relative difference <6%) and enhance the time resolution of the color Doppler images, achieving frame rates up to 625 Hz in continuous acquisition.
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Ramalli et al. (2020) studied Healthy volunteers (in vivo) and experimental phantom (n=2). High-frame-rate (HFR) imaging sequences (diverging waves and multiline transmission) vs. Standard single-line transmission (SLT) scans was evaluated on Velocity estimate accuracy (relative difference) and artifact area spread. High-frame-rate techniques provided comparable velocity estimates (relative difference <6%) but spread artifacts on larger areas (> +50%) and reduced penetration depth up to -5 cm.
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