Magnetic bottle Time-of-Flight (ToF) spectrometers can measure the energy spectra of all electrons emitted into a 2π sr solid angle simultaneously, greatly reducing data collection time. When detection annihilation gamma (γ) and electron (e) are used as timing signals for ToF spectrometers, e-γ time difference (e-γ TDS) reflective positron-induced distributions provided times between impact pos...

Cerebral accumulation of amyloid-β is thought to be the starting mechanism in Alzheimer's disease. Amyloid-β can be detected by analysis of cerebrospinal fluid amyloid-β42 or amyloid positron emission tomography, but it is unknown if any of the methods can identify an abnormal amyloid accumulation prior to the other. Our aim was to determine whether cerebrospinal fluid amyloid-β42 change before...

Positron scattering by beryllium atoms in the low-energy range (?4.0 eV) was studied within ab initio and semiempirical frameworks. When interpreting static dipole polarizability length as representative quantities of target positron–atom correlations, observables obtained calculation were extrapolated applying a approach. Our results ratify previous ones, since no Ramsauer minimum structures o...

Abstract Purpose This systematic review aimed to collect published studies concerning intraoperative gamma detection of positron-emitting tracers for radioguided surgery (RGS) applications. Methods A literature search until October 2022 was performed in Pubmed, Web Of Science, Central (Cochrane Library) and Scopus databases, including the following keywords: “Positron Emission Tomography” OR “P...

Positron emission tomography imaging using thymidine and analogues labeled with positron emitters provides noninvasive and quantitative estimates of regional cellular proliferation. This CCR Translations summary reviews the biological basis for proliferation imaging and discusses recent results using 18F-fluorothymidine-positron emission tomography to measure response to targeted therapy in the...

This article presents an overview of current understanding of the interaction of low-energy positrons with molecules with emphasis on resonances, positron attachment, and annihilation. Measurements of annihilation rates resolved as a function of positron energy reveal the presence of vibrational Feshbach resonances VFRs for many polyatomic molecules. These resonances lead to strong enhancement ...

Widespread studies on tumor diagnosis has led to the development of techniques with greater sensitivity and improved specificity for detection of occult and small subclinical tumors. Tumor imaging by radiolabeling of tumor-specific antibodies (Immunoscintigraphy) or tissue specific biochemical agents (Receptor imaging) and especially physiologic imaging with positron emitters (PET), have ...