Pilot study of the multicentre DISCHARGE trial: image quality and protocol adherence results of computed tomography and invasive coronary angiography (vol 30, pg 1997, 2020)

The original version of this article, published on 16 December 2019, unfortunately contained two mistakes.Cardiovascular Aspects of Radiolog

Distribution of rhenium in molybdenite from porphyry Cu-Mo and Mo-Cu deposits of Russia (Siberia) and Mongolia

Rhenium was determined in representative molybdenite samples (concentrates) from the Aksug, Erdenetuin-Obo, Zhireken, Shakhtama and Sora porphyry Cu-Mo and Mo-Cu deposits of Russia (Siberia) and Mongolia. The Re contents in the majority of the concentrates are low, ranging from 6 to 460 ppm. The maximum Re contents were determined in molybdenite concentrates from the Aksug (460 ppm Re) and Erdenetuin-Obo (199 ppm Re) Co-Mo porphyry deposits and are significantly higher than those from the Zhireken, Shakhtama and Sora Mo-Cu porphyry deposits. The Re content of molybdenite concentrates from the studied Mo-Cu porphyry deposits (6 to 57 ppm) are, however, comparable to those from comparable deposits worldwide. The Aksug and Erdenetuin-Obo deposits, with relatively elevated Re content, differ from the Zhireken, Shakhtama and Sora deposits with lower Re contents in terms of (1) higher Cu/Mo ratio; (2) lower δ34S and 87Sr/86Sr values; (3) silica and alkali contents of the host rocks; (4) the alteration type of the associated rocks; (5) the elevated Cl activity in the fluid; (6) the lower temperature of the molybdenite formation; and (7) the higher oxidized conditions. The Re contents of molybdenite from porphyry Cu-Mo deposits may therefore be related to the composition of parent magmas themselves and/or fractionation, sources of the material, and variations of physical and chemical conditions of crystallization (fO2, Cl activity, P, T). © 2005 Elsevier B.V. All rights reserved

First finding of merenskyite (Pd,Pt)Te2 in porphyry Cu-Mo ores in Russia

Contents of Pt and Pd were determined in weakly mineralized rocks, ores, and flotation concentrates of the Aksug porphyry Cu-Mo deposit, northeastern Tuva. In all studied samples they are above the detection limits: Pt = 17-96 ppb and Pd = 9-924 ppb. These elements are unevenly distributed throughout the rocks and ores, with Pd/Pt varying from 0.5 to 37. Study of Pd-rich ores (up to 924 ppb, Pd/Pt = 37) on a JEOL JSM 5600 scanning electron microscope revealed finest (2-5 μm) merenskyite inclusions (25.20% Pd, 1.21% Pt, 72.31% Te) in chalcopyrite. The calculated crystallochemical formula of merenskyite from ores of the Aksug deposit is (Pd0.862Pt0.023Cu0.026Fe0.025)Te2.064. The merenskyite is associated with electrum (79.92% Au, 18.96% Ag), monazite, cobaltite, tennantite, and Sr-containing barite (4.6-18.0% Sr). Palladium mineralization occurs in massive chalcopyrite veinlets in zones of intensely propylitized rocks. The Devonian Aksug ore-bearing porphyry complex developed in the field of Early-Middle Cambrian intrusions of gabbro-diorite-plagiogranites associated with basalt-andesite effusions of island-arc complex. This might have led to high PGE contents in the Aksug rocks. The deposit formation proceeded with the participation of ore-bearing Cl-enriched fluids favoring the concentration and transport of PGE in porphyry copper systems. © 2007

Pilot study of the multicentre DISCHARGE Trial: image quality and protocol adherence results of computed tomography and invasive coronary angiography

Objective To implement detailed EU cardiac computed tomography angiography (CCTA) quality criteria in the multicentre DISCHARGE trial (FP72007-2013, EC-GA 603266), we reviewed image quality and adherence to CCTA protocol and to the recommendations of invasive coronary angiography (ICA) in a pilot study. Materials and methods From every clinical centre, imaging datasets of three patients per arm were assessed for adherence to the inclusion/exclusion criteria of the pilot study, predefined standards for the CCTA protocol and ICA recommendations, image quality and non-diagnostic (NDX) rate. These parameters were compared via multinomial regression and ANOVA. If a site did not reach the minimum quality level, additional datasets had to be sent before entering into the final accepted database (FADB). Results We analysed 226 cases (150 CCTA/76 ICA). The inclusion/exclusion criteria were not met by 6 of the 226 (2.7%) datasets. The predefined standard was not met by 13 of 76 ICA datasets (17.1%). This percentage decreased between the initial CCTA database and the FADB (multinomial regression, 53 of 70 vs 17 of 75 [76%] vs [23%]). The signal-to-noise ratio and contrast-to-noise ratio of the FADB did not improve significantly (ANOVA, p = 0.20; p = 0.09). The CTA NDX rate was reduced, but not significantly (initial CCTA database 15 of 70 [21.4%]) and FADB 9 of 75 [12%]; p = 0.13). Conclusion We were able to increase conformity to the inclusion/exclusion criteria and CCTA protocol, improve image quality and decrease the CCTA NDX rate by implementing EU CCTA quality criteria and ICA recommendations.Cardiovascular Aspects of Radiolog