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Praseodymium-containing double perovskites (Ba1-xSrx)2PrRuO6 were prepared. They crystallize in a monoclinic structure with space group P21/n in the range of 0 ≤ x ≤ 0.30. Magnetic susceptibility measurements show that all these (Ba1-xSrx)2PrRuO6 compounds order an antiferromagnetic transition at 95 ≤ T ≤ 117 K, and the Neel temperatures decrease with increasing Sr concentration (x value). Specific heat measurements and the magnetic entropy change for (Ba1-xSrx)2PrRuO6 also reveal the simultaneous magnetic ordering of Pr and Ru ions.

In this study, a laparoscopic imaging device and a light source able to select wavelengths by bandpass filters were developed to perform multispectral imaging (MSI) using over 1000 nm near-infrared (OTN-NIR) on regions under a laparoscope. Subsequently, MSI (wavelengths: 1000–1400 nm) was performed using the built device on nine live mice before and after tumor implantation. The normal and tumor pixels captured within the mice were used as teaching data sets, and the tumor-implanted mice data were classified using a neural network applied following a leave-one-out cross-validation procedure. The system provided a specificity of 89.5%, a sensitivity of 53.5%, and an accuracy of 87.8% for subcutaneous tumor discrimination. Aggregated true-positive (TP) pixels were confirmed in all tumor-implanted mice, which indicated that the laparoscopic OTN-NIR MSI could potentially be applied in vivo for classifying target lesions such as cancer in deep tissues.