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Amanuel KF. Production of 68Ge, 68Ga, 67Ga, 65Zn, and 64Cu important radionuclides for medical applications: theoretical model predictions for α-particles with 66Zn at ≈10–40 MeV. RADIOCHIM ACTA 2022. [DOI: 10.1515/ract-2022-0075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Abstract
Theoretical predictions were made using TALYS-1.95(G) and EMPIRE 3.2 reaction-model codes for 69Ge, 67Ge, and medically used 68Ge, 67Ga, 68Ga, 65Zn, 64Cu radionuclides produced in the interaction of α-projectile with 66Zn-target at 10–40 MeV α-energies. Pearson’s statistical coefficients showed moderate to strong positive correlations between the theoretically predicted and experimentally measured production cross sections for radionuclides with practical medical applications. Furthermore, the present results indicated that a medium-sized cyclotron and a single α + 66Zn system (projectile + target system) might be an option for optimized production of 68Ge, 68Ga, 67Ga, 65Zn, and 64Cu radionuclides.
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Affiliation(s)
- Kifle F. Amanuel
- Department of Applied Physics , Hawassa University , Hawassa , P. O. Box 05 , Ethiopia
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Lim CP, Chiam PTL, Lai HK, Koh YL. A rare case of isolated atrial myocarditis. Singapore Med J 2022; 62:610-614. [PMID: 35001133 DOI: 10.11622/smedj.2021227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Choon Pin Lim
- The Heart and Vascular Centre, Mount Elizabeth Novena Hospital, Singapore
| | | | - Hee Kit Lai
- Radiology Department, Mount Elizabeth Novena Hospital, Singapore
| | - Yin Ling Koh
- The Novena Medical Specialists, Mount Elizabeth Novena Hospital, Singapore
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Ramírez-Franco J, Oros-Pantoja R, Torres-García E, Aranda-Lara L, Díaz-Sánchez LE, Herrera-Ayala CI, Pérez-Soto E, Azorín-Vega EP. Effects of chronic immobilization stress on biokinetics and dosimetry of 67Ga in a murine model. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2020; 59:257-263. [PMID: 32240361 DOI: 10.1007/s00411-020-00839-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 03/14/2020] [Indexed: 06/11/2023]
Abstract
The aim of this work is to determine the effect of chronic immobilization stress on kinetics and dosimetry of 67Ga in a mouse model. A control group (CG) and a stress group (SG), each with 15 mice, were included in the study, and the latter group was subjected to a chronic immobilization stress model 2 h daily for 14 consecutive days. At day 13, 67Ga-citrate was administered intraperitoneally (11.24 ± 0.44 MBq) to each mouse. Then, sets of three mice were obtained sequentially at 24, 36, 48, 60 and 72 h, in which the radionuclide activity was measured with an activity counter. The 67Ga biokinetic data showed a fast blood clearance in the SG, with a mean residence time of 0.06 h. The calculated mean radiation absorbed doses were: liver (2.45 × 10-03 Gy), heart (3.17 × 10-04 Gy) and kidney (1.88 × 10-04 Gy) in the SG. The results show that stress reduced weight gain by approximately 13% and also increased adrenal gland weight by 26%. On the other hand, chronic stress accelerates 67Ga clearance after 24 h compared to normal conditions. It is concluded that murine organisms under chronic immobilization stress have higher gallium-67 clearance rates, decreasing the cumulated activity and absorbed dose in all organs.
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Affiliation(s)
- Jorge Ramírez-Franco
- Facultad de Medicina, Universidad Autónoma del Estado de México, Paseo Tollocan s/n esquina Jesús Carranza, Col. Moderna de la Cruz, CP 50180, Toluca, México, México
- Departamento de Física Médica, Hospital de Oncología Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, 06720, México City, México
| | - Rigoberto Oros-Pantoja
- Facultad de Medicina, Universidad Autónoma del Estado de México, Paseo Tollocan s/n esquina Jesús Carranza, Col. Moderna de la Cruz, CP 50180, Toluca, México, México
| | - Eugenio Torres-García
- Facultad de Medicina, Universidad Autónoma del Estado de México, Paseo Tollocan s/n esquina Jesús Carranza, Col. Moderna de la Cruz, CP 50180, Toluca, México, México.
| | - Liliana Aranda-Lara
- Facultad de Medicina, Universidad Autónoma del Estado de México, Paseo Tollocan s/n esquina Jesús Carranza, Col. Moderna de la Cruz, CP 50180, Toluca, México, México
| | - Luis E Díaz-Sánchez
- Facultad de Medicina, Universidad Autónoma del Estado de México, Paseo Tollocan s/n esquina Jesús Carranza, Col. Moderna de la Cruz, CP 50180, Toluca, México, México
| | - Claudia I Herrera-Ayala
- Departamento de Medicina Nuclear, Centro Oncológico Estatal ISSEMyM, 50180, Toluca, Estado de México, México
| | - Elvia Pérez-Soto
- Programa Institucional de Biomedicina Molecular ENMyH, Instituto Politécnico Nacional, 07320, Mexico City, México
| | - Erika P Azorín-Vega
- Departamento de Materiales Radiactivos, Instituto Nacional de Investigaciones Nucleares (ININ), 52750, Ocoyoacac, Estado de México, México
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Diagnostic Efficacy of Cardiac Scintigraphy with 99mTc-Pyrophosphate for Latent Myocardial Inflammation in Patients with Atrial Fibrillation. Cardiol Res Pract 2020; 2020:5983751. [PMID: 32211203 PMCID: PMC7057002 DOI: 10.1155/2020/5983751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 01/28/2020] [Accepted: 01/30/2020] [Indexed: 11/17/2022] Open
Abstract
Objectives This work aimed to study the efficacy of hybrid 99mTc-Pyrophosphate SPECT/CT for diagnosis of latent inflammatory processes in the myocardium of patients with atrial fibrillation (AF). Methods The study comprised 34 patients aged 44 ± 9 years with AF of unknown etiology referred for radiofrequency ablation. The data were acquired using hybrid 99mTc-Pyrophosphate SPECT/CT. To evaluate and interpret the results of hybrid study and to determine localization of radiopharmaceutical accumulation, scintigraphic and CT images were fused. SPECT/CT results were compared with data of endomyocardial biopsy. Results Sensitivity, specificity, and accuracy of 99mTc-Pyrophosphate SPECT/CT in diagnosing myocarditis were 91%, 100%, and 94%, respectively. Proposed diagnostic criteria for myocarditis comprised intensity of the radiopharmaceutical accumulation in the myocardium and the ratios of focus/lung, focus/vertebral column, and focus/LV pool. Minimum cutoff values for the histologically verified myocarditis were >1.47 for focus/lung index, >0.11 for focus/vertebral column ratio, and >1.26 for focus/lung index. Conclusions SPECT/CT-based quantitative assessment of 99mTc-Pyrophosphate accumulation in the myocardium is a highly informative noninvasive method for diagnosis of inflammatory process in the heart in patients with AF of undefined etiology.
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