Response by Chan et al to Radico et al Regarding Article, “Effect of the 2017 European Guidelines on Reclassification of Severe Aortic Stenosis and Its Influence on Management Decisions for Initially Asymptomatic Aortic Stenosis”

Chan, Daniel C. S.; Singh, Anvesha; McCann, Gerry P

doi:10.1161/circimaging.121.012487

Cited by 3 publications

(1 citation statement)

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“…Due to the short variability timescale, the effective uv-coverage in every frame is not sufficient for efficient snapshot imaging. Modern approaches utilize a temporal correlation instead, in a Bayesian framework (Bouman et al 2018;Broderick et al 2022;Roelofs et al 2023) or as temporal regularizer in the RML framework (Bouman et al 2018;Johnson et al 2017;Chael et al 2022;Roelofs et al 2023). Moreover, the variability of the source could be misidentified with the calibration of the gains (Event Horizon Telescope Collaboration et al 2022b).…”

Section: Introductionmentioning

confidence: 99%

Dynamic and Polarimetric VLBI imaging with a multiscalar approach

Müller¹,

Lobanov²

2023

A&A

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Context. Due to the limited number of antennas and the limited observation time, an array of antennas in very long baseline interferometry (VLBI) often samples the Fourier domain only very sparsely. Powerful deconvolution algorithms are needed to compute a final image. Multiscale imaging approaches such as DoG-HiT have recently been developed to solve the VLBI imaging problem and show promising performance: they are fast, accurate, unbiased, and automatic. Aims. We extend the multiscalar imaging approach to polarimetric imaging, to reconstructions of dynamically evolving sources, and finally to dynamic polarimetric reconstructions. Methods. These extensions (mr-support imaging) utilize a multiscalar approach. The time-averaged Stokes I image was decomposed by a wavelet transform into single subbands. We used the set of statistically significant wavelet coefficients, the multiresolution support (mr-support), computed by DoG-HiT as a prior in a constrained minimization manner; we fitted the single-frame (polarimetric) observables by only varying the coefficients in the multiresolution support.Results. The Event Horizon Telescope (EHT) is a VLBI array imaging supermassive black holes. We demonstrate on synthetic data that mr-support imaging offers ample regularization and is able to recover simple geometric dynamics at the horizon scale in a typical EHT setup. The approach is relatively lightweight, fast, and largely automatic and data driven. The ngEHT is a planned extension of the EHT designed to recover movies at the event horizon scales of a supermassive black hole. We benchmark the performance of mr-support imaging for the denser ngEHT configuration demonstrating the major improvements the additional ngEHT antennas will bring to dynamic polarimetric reconstructions. Conclusions. Current and upcoming instruments offer the observational possibility to do polarimetric imaging of dynamically evolving structural patterns with the highest spatial and temporal resolution. State-of-the-art dynamic reconstruction methods can capture this motion with a range of temporal regularizers and priors. With this work, we add an additional simpler regularizer to the list: constraining the reconstruction to the multiresolution support.

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