Heavy ion therapy has two definite advantages: good dose localization and higher biological effect. Range calculation of the heavy ions is an important factor in treatment planning. X-ray CT numbers are used to estimate the heavy ion range by looking up values in a conversion table which relates empirically photon attenuation in tissues to particle stopping power; this is one source of uncertainty in the treatment planning. Use of positron emitting radioactive beams along with a positron emission tomograph or a positron camera gives range information and may be used as a means of checking in heavy ion treatment planning. However, the metabolism of the implanted positron emitters in a living object is unpredictable because the chemical forms of these emitters are unknown and the metabolism is dependent on the organ species and may be influenced by many factors such as blood flow rate and fluid components present. In this paper, the washout rate of 11C activity implanted by injecting energetic 11C beams into thigh muscle of a rear leg of a rabbit is presented. The washout was found to consist of two components, the shorter one was about 4.2 +/- 1.1 min and the longer one ranged from 91 to 124 min. About one third of the implanted beta+ activity can be used for imaging and the rest was washed out of the target area.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1088/0031-9155/48/7/305 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Pre-enrichment-free electrochemical detection of lead ions using functionalized tungsten oxide: Integration of surface functionalization and redox cycling mechanisms.
Talanta
March 2025
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130000, PR China. Electronic address:
Methods for electrochemical detection of heavy metal ions have garnered widespread attention due to their high sensitivity, ease of operation, low cost, and suitability for on-site detection. However, these methods typically require a pre-enrichment step to improve the detection limit and sensitivity, which increases operational complexity and introduces potential errors. In this study, tungsten oxide electrodes with various functional groups were prepared by electrodeposition and high-temperature annealing, utilizing the amphoteric properties of l-alanine.
View Article and Find Full Text PDFHydrolysis of myofibrillar proteins by protease AprA secreted from Pseudomonas fragi: Preference for degrading Ala-linked peptide bonds.
Food Chem
March 2025
State Key Laboratory of Meat Quality Control and Cultured Meat Development, Nanjing Agricultural University, Nanjing 210095, PR China. Electronic address:
Extracellular proteases of bacteria have attracted attention in recent years. Alkaline protease AprA secreted from Pseudomonas fragi has been shown to cause spoilage in chilled meat and to degrade myofibrillar proteins (MPs), but the spoilage mechanism was unknown. AprA possessed a high affinity for substrate proteins (K = 1.
View Article and Find Full Text PDFPET Coordination Mechanism for the Detecting of Environmental Toxic Analytes: Current Approaches and Future Directions.
J Fluoresc
March 2025
Department of English, Easwari Engineering College, Chennai, India.
Fluorescence-based photoinduced electron transfer (PET) has garnered significant attention in the molecular recognition field in recent years because of its unique and desirable photophysical properties. Recent advancements in PET-based chemosensors have demonstrated their potential for real-time monitoring of pollutants such as heavy metals, pesticides, and organic contaminants in various environmental matrices. This review emphasizes the recent advancements in fluorogenic and chromogenic PET-based chemosensors based on Anthracene, Imidazole, Indole, Pyrrole, Thiazole, Naphthalene, Quinoline, Calix[4]arene, Fluorescein, Quantum Dots, Schiff base compounds and also focusing on their molecular design, sensing mechanisms, and photophysical properties reported from the year 2011 to 2024.
View Article and Find Full Text PDFControllable Preparation of Low-Cost Coal Gangue-Based SAPO-5 Molecular Sieve and Its Adsorption Performance for Heavy Metal Ions.
Nanomaterials (Basel)
February 2025
College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
With the advancement of industrial production and urban modernization, pollution from heavy metal ions and the accumulation of solid waste have become critical global environmental challenges. Establishing an effective recycling system for solid waste and removing heavy metals from wastewater is essential. Coal gangue was used in this study as the primary material for the synthesis of a fully coal gangue-based phosphorus-silicon-aluminum (SAPO-5) molecular sieve through a hydrothermal process.
View Article and Find Full Text PDFStudy of the hydrogeochemical processes and its impact on the quality of groundwater in the area between Abu Simbil and Tushka, Western Desert, Egypt.
Sci Rep
March 2025
Hydrogeochemistry Department, Desert Research Center, 1-Mathaf El Mataryia St., El Mataryia, Cairo, Egypt.
The study area is located in a hyper arid area in the Western Egyptian Desert, which represents a massive agricultural project where irrigation water is extracted from the Nubian sandstone aquifer. This study focuses on the hydrogeochemical processes and its impact on the quality of the groundwater aquifer. Based on the geomorphology, the study area includes five geomorphological units, Wadi Kurkur bediplain, Aswan High Dam Lake, the Nile Valley, the West Dungul plain, and basement outcrops.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!