The purpose of the study was the qualitative and quantitative digital image analysis of pancreatic adenocarcinomas using conventional endoscopic ultrasonography (EUS) and CEH-EUS and the evaluation of whether contrast medium injection modified adenocarcinoma staging and patient management.\n\nMaterials and Methods: In each of 30 prospectively examined patients with suspected pancreatic solid lesions, CEH-EUS was performed using the same quantity of the contrast agent SonoVue and a low mechanical index (0.3 – 0.4), followed by EUS-FNA. PXD101 in vitro The histology, based on EUS-FNA or surgery and 9 months of follow-up, was:
pancreatic adenocarcinoma (n = 15), pseudotumoral chronic pancreatitis (n = 12), neuroendocrine tumor (n = 1), common bile duct tumor (n = 1), lymph node metastases of gastric cancer (n = 1). The quantitative analysis was based on histograms obtained from each CEH-EUS video recording.\n\nResults: CEH-EUS showed a hypoenhanced pattern in 14 cases of adenocarcinoma and in 10 cases of chronic pancreatitis. ARRY-142886 The index of the contrast uptake ratio was significantly lower in adenocarcinoma than in mass-forming chronic pancreatitis. A cut-off uptake ratio index value of 0.17 for diagnosing adenocarcinoma corresponded to an AUC (CI 95%) of 0.86 (0.67 – 1.00) with a sensitivity of 80%, a specificity of 91.7%, a positive predictive value of 92.8%,
and a negative predictive value of 78%. The size of the pancreatic mass was assessed significantly more effectively by CEH-EUS but adenocarcinoma staging was not modified.\n\nConclusion: The majority of cases of both pancreatic adenocarcinoma Buparlisib mw and chronic pancreatitis were hypoenhanced and visual discrimination was not possible. This is the first study about CEH-EUS for the quantitative assessment of uptake after contrast injection which has shown that it can aid differentiation between
benign and malignant masses but cannot replace EUS-FNA. Neither tumor stage nor therapeutic management have changed after contrast medium injection during CEH-EUS.”
“The influence of the band structure, especially the bandwidth, on the scattered ion yield spectra of a He+ ion by the resonant or quasi-resonant neutralization was theoretically examined using quantum rate equations. When calculating the scattered ion yield spectra of He+ to simulate the experimental data, we observed that the band structure, especially the bandwidth, had a strong influence on the spectra at relatively low incident He+ ion energies of less than several hundred eV. Through many simulations, it was determined that theoretical calculations that include bandwidth calculation can simulate or reproduce the experimentally observed spectra of He+-In, He+-Ga, and He+-Sn systems. In contrast, simulations not including bandwidth simulation could neither reproduce nor account for such spectra.