Search results for " PET"

Value of Combined PET Imaging with [18F]FDG and [68Ga]Ga-PSMA-11 in mCRPC Patients with Worsening Disease during [177Lu]Lu-PSMA-617 RLT

2021

Despite the promising results of prostate-specific membrane antigen (PSMA)-targeted radioligand therapy (RLT) in metastatic castration-resistant prostate cancer (mCRPC), some patients show worsening disease during PSMA-RLT. We investigated the value of combined [18F]FDG and [68Ga]Ga-PSMA-11 PET imaging in this setting. In n = 29 mCRPC patients with worsening disease after a median of four cycles of [177Lu]Lu-PSMA-617 RLT, combined [18F]FDG and [68Ga]Ga-PSMA-11 PET imaging was performed to detect [18F]FDG-avid lesions with low or no PSMA expression (mismatch lesions). To evaluate prognostic implication of mismatch, survival analyses regarding presence, location, and [18F]FDG PET-derived para…

Radiomics Analysis of Brain [18F]FDG PET/CT to Predict Alzheimer’s Disease in Patients with Amyloid PET Positivity: A Preliminary Report on the Appli…

2022

Background: Early in-vivo diagnosis of Alzheimer’s disease (AD) is crucial for accurate management of patients, in particular, to select subjects with mild cognitive impairment (MCI) that may evolve into AD, and to define other types of MCI non-AD patients. The application of artificial intelligence to functional brain [18F]fluorodeoxyglucose (FDG) positron emission tomography (PET)/computed tomography(CT) aiming to increase diagnostic accuracy in the diagnosis of AD is still undetermined. In this field, we propose a radiomics analysis on advanced imaging segmentation method Statistical Parametric Mapping (SPM)-based completed with a Machine-Learning (ML) application to predict the diagnosi…

Crystal field and magnetism with Wannier functions: Rare-earth doped aluminum garnets

2015

Using the recently developed method we calculate the crystal field parameters in yttrium and lutetium aluminum garnets doped with seven trivalent Kramers rare-earth ions. We then insert calculated parameters into the atomic-like Hamiltonian taking into account the electron-electron, spin-orbit and Zeeman interactions and determine the multiplet splitting by the crystal field as well as magnetic $\hat{g}$ tensors. We compare calculated results with available experimental data.

The crater lake of Ilamatepec (Santa Ana) volcano, El Salvador: insights into lake gas composition and implications for monitoring

2019

We here present the first chemical characterization of the volcanic gas plume issuing from the Santa Ana crater lake, a hyper-acidic crater lake (pH of − 0.2 to 2.5) in north-western El Salvador. Our results, obtained during regular surveys in 2017 and 2018 using a Multi-GAS instrument, demonstrate a hydrous gas composition (H2O/SO2 ratios from 32 to 205) and SO2 as the main sulfur species (H2S/SO2 = 0.03–0.1). We also find that gas composition evolved during our investigated period, with the CO2/SO2 ratio decreasing by one order of magnitude from March 2017 (37.2 ± 9.7) to November 2018 (< 3). This compositional evolution toward more magmatic (SO2-rich) compositions is interpreted in the c…

Smilts-grants nogulumu mineraloģiski petrogrāfiskais raksturojums Madonas novada atradnēs

2015

Bakalaura darbā veikts pētījums par Madonas novada smilts - grants ieguves vietās iegūstamo minerālu un iežu iespējamajām reakcijām ar sārmiem betonā. Pētījuma mērķis ir noteikt potenciāli reaktīvo graudu klātesamību atradņu minerālajos materiālos, izmantojot RILEM ieteikto metodi. Lauka pētījumos apsekotas četras atradnes un ievākti smilts – grants paraugi mineroloģiski petroloģiskai analīzei. Iegūtie dati analizēti, galveno uzmanību pievēršot potenciāli reaktīvo iežu un minerālu procentuālajam sastāvam paraugos. Pētījuma gaitā iegūtie rezultāti ļauj izdarīt secinājumus, ka materiāla potenciāli reaktīvās daļas procentuālais sastāvs sastāda 19,23%. Minerāli un ieži, kas uzskatāmi kā noteikt…

“I’m just being a difficult LoTR hardcore fan” : Tolkien Fans’ Actions and Reactions to Peter Jackson’s The Hobbit Trilogy

2022

Peter Jackson’s The Hobbit trilogy has been debated and discussed widely. Fans of J.R.R. Tolkien have had strong opinions about the films, and I believe that their online conversations about the movies call for a closer look. I am particularly interested in Tolkien fans’ reactions to the films; the reasons for these reactions; and the actions they provoked. Some fans loved the possibility of revisiting Middle-earth. They drew a clear distinction between the book and the movies, showing understanding towards the changes and additions required by the adaptation process. Pitted against them were the fans who experienced the films negatively. This group did not differentiate between the movies …

Effetto della presenza di piccoli quantitativi di PLA nel riciclo di contenitori in PET

2011

A method for measuring wetting and swelling of bentonite using X-ray imaging

2022

A non-invasive method based on X-ray imaging for measuring deformation and water transport in wetting and swelling bentonite samples is introduced. Sequential X-ray images taken of the samples were used to calculate the attenuation coefficient and deformation. These results, together with careful calibration, allowed finding the dry density and water content distributions and their temporal evolution in the wetting and swelling samples. A specific correction technique, based on regularly taking reference X-ray images of aluminum plates of varying thickness, was developed and used to take into account X-ray beam instabilities and thus to improve the accuracy of density analysis. Large deform…

Geological and cultural heritage: Dissemination experiences in Tuscany

2019

We report on some recent experiences of scientific dissemination activities on geomaterials carried out by a network of scientific organizations in Tuscany (Italy). The primary message we want to disseminate is that even the most "insignificant" rock (e.g., those constituting the bar or kitchen counter-tops) stores in their interior very useful information beyond the beautiful colors and their aesthetic appearance. These rocks can tell stories of very old geological periods on how they were formed. Their structures, texture and shape, as well as their chemistry and mineralogy provide clues to the reconstruction of geological events. Moreover, the rocks used in urban architecture and monumen…

Stress sensitivity of stylolite morphology

2009

International audience; Stylolites are rough surfaces that form by localized stress-induced dissolution. Using a set of limestone rock samples collected at different depths from a vertical section in Cirque de Navacelles (France), we study the influence of the lithostatic stress on the stylolites morphology on the basis of a recent morphogenesis model. We measured the roughness of a series of bedding-parallel stylolites and show that their morphology exhibits a scaling invariance with two self-affine scaling regimes separated by a crossover-length (L) at the millimeter scale consistent with previous studies. The importance of the present contribution is to estimate the stylolite formation s…