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Comparison of IRGN-TV and IRGN-TGV for phantom data (top: pseudorandom sampling; bottom: radial sampling; both: βmin = 5 · 10−3). Left: IRGN-TV (magnified details from Figs. 1, R = 10 and 5). Modulations from the coil sensitivities lead to pronounced staircasing artifacts from TV regularization. Right: IRGN-TGV. Staircasing artifacts are completely removed for TGV regularization.
