Large-scale multi-center CT and MRI segmentation of pancreas with deep learning.

Automated volumetric segmentation of the pancreas on cross-sectional imaging is needed for diagnosis and follow-up of pancreatic diseases. While CT-based pancreatic segmentation is more established, MRI-based segmentation methods are understudied, largely due to a lack of publicly available datasets, benchmarking research efforts, and domain-specific deep learning methods. In this retrospective study, we collected a large dataset (767 scans from 499 participants) of T1-weighted (T1 W) and T2-weighted (T2 W) abdominal MRI series from five centers between March 2004 and November 2022.

Deciphering the Polymorphism of CaSi: The Influence of Heat and Composition.

The Zintl phase CaSi is a layered compound with stacking variants known as 1P, 3R, and 6R. We extend the series by the 21R polytype formed by rapid cooling of the melt. The crystal structure of 21R-CaSi (space group 3̅) was derived from HRTEM images, and the atomic positions were optimized by using the FPLO code ( = 3.

Nitridochromate(IV) fluoride - LiCa[CrN]NF.

LiCa[CrN]NF ( (#58), = 17.5230(13) Å, = 7.3379(5) Å, = 4.

Ordering by cation replacement in the system NaLiGa.

Samples of the pseudo-binary system NaLiGa ( ≤ 1) were synthesized from the elements at 300 °C in sealed Ta ampoules or by the reaction of NaGa with LiCl. The peritectic formation temperature decreases with increasing Li content from 501(2) °C ( = 0) to 489(2) °C ( = 1). The boundary compositions NaGa and NaLiGa crystallize with different structure types related by a group-subgroup relation.

Al-Pt intermetallic compounds: HAXPES study.

Intermetallic compounds in the Al-Pt system were systematically studied hard X-ray photoelectron spectroscopy, focusing on the positions of Pt 4f and Al 2s core levels and valence band features. On one hand, with increasing Al content, the Pt 4f core levels shift towards higher binding energies (BE), revealing the influence of the atomic interactions (chemical bonding) on the electronic state of Pt. On the other hand, the charge transfer from Al to Pt increases with increasing Al content in Al-Pt compounds.