| 51. |
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| 52. |
- Peterson, Magnus, et al.
(författare)
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PET-Scan Shows Peripherally Increased Neurokinin 1 Receptor Availability in Chronic Tennis Elbow : Visualizing Neurogenic Inflammation?
- 2013
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Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 8:10
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Tidskriftsartikel (refereegranskat)abstract
- In response to pain, neurokinin 1 (NK1) receptor availability is altered in the central nervous system. The NK1 receptor and its primary agonist, substance P, also play a crucial role in peripheral tissue in response to pain, as part of neurogenic inflammation. However, little is known about alterations in NK1 receptor availability in peripheral tissue in chronic pain conditions and very few studies have been performed on human beings. Ten subjects with chronic tennis elbow were therefore examined by positron emission tomography (PET) with the NK1 specific radioligand [11C]GR205171 before and after treatment with graded exercise. The radioligand signal intensity was higher in the affected arm as compared with the unaffected arm, measured as differences between the arms in volume of voxels and signal intensity of this volume above a reference threshold set as 2.5 SD above mean signal intensity of the unaffected arm before treatment. In the eight subjects examined after treatment, pain ratings decreased in all subjects but signal intensity decreased in five and increased in three. In conclusion, NK1 receptors may be activated, or up-regulated in the peripheral, painful tissue of a chronic pain condition. This up-regulation does, however, have moderate correlation to pain ratings. The increased NK1 receptor availability is interpreted as part of ongoing neurogenic inflammation and may have correlation to the pathogenesis of chronic tennis elbow.
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| 53. |
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| 54. |
- Sandström, Mattias, et al.
(författare)
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Comparative Biodistribution and Radiation Dosimetry of Ga-68-DOTATOC and Ga-68-DOTATATE in Patients with Neuroendocrine Tumors
- 2013
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Ingår i: Journal of Nuclear Medicine. - : Society of Nuclear Medicine. - 0161-5505 .- 1535-5667 .- 2159-662X. ; 54:10, s. 1755-1759
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Tidskriftsartikel (refereegranskat)abstract
- Ga-68-DOTATOC and Ga-68-DOTATATE are 2 radiolabeled somatostatin analogs for in vivo diagnosis of neuroendocrine tumors with PET. The aim of the present work was to measure their comparative biodistribution and radiation dosimetry. Methods: Ten patients diagnosed with neuroendocrine tumors were included. Each patient underwent a 45-min dynamic and 3 whole-body PET/CT scans at 1, 2, and 3 h after injection of each tracer on consecutive days. Absorbed doses were calculated using OLINDA/EXM 1.1. Results: Data from 9 patients could be included in the analysis. Of the major organs, the highest uptake at 1, 2, and 3 h after injection was observed in the spleen, followed by kidneys and liver. For both tracers, the highest absorbed organ doses were seen in the spleen and urinary bladder wall, followed by kidney, adrenals, and liver. The absorbed doses to the liver and gallbladder wall were slightly but significantly higher for Ga-68-DOTATATE. The total effective dose was 0.021 +/- 0.003 mSv/MBq for both tracers. Conclusion: The effective dose for a typical 100-MBq administration of Ga-68-DOTATATE and Ga-68-DOTATOC is 2.1 mSv for both tracers. Therefore, from a radiation dosimetry point of view, there is no preference for either tracer for PET/CT evaluation of somatostatin receptor-expressing tumors.
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| 55. |
- Schuster, David M., et al.
(författare)
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Anti-1-Amino-3-F-18-Fluorocyclobutane-1-Carboxylic Acid : Physiologic Uptake Patterns, Incidental Findings, and Variants That May Simulate Disease
- 2014
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Ingår i: Journal of Nuclear Medicine. - : Society of Nuclear Medicine. - 0161-5505 .- 1535-5667 .- 2159-662X. ; 55:12, s. 1986-1992
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Tidskriftsartikel (refereegranskat)abstract
- Anti-1-amino-3-F-18-fluorocyclobutane-1-carboxylic acid (F-18-FACBC) is a synthetic amino acid analog PET radiotracer undergoing clinical trials for the evaluation of prostate and other cancers. We aimed to describe common physiologic uptake patterns, incidental findings, and variants in patients who had undergone F-18-FACBC PET. Methods: Sixteen clinical trials involving 611 F-18-FACBC studies from 6 centers, which included dosimetry studies on 12 healthy volunteers, were reviewed. Qualitative observations of common physiologic patterns, incidental uptake, and variants that could simulate disease were recorded and compared with similar observations in studies of the healthy volunteers. Quantitative analysis of select data and review of prior published reports and observations were also made. Results: The liver and pancreas demonstrated the most intense uptake. Moderate salivary and pituitary uptake and variable mild to moderate bowel activity were commonly visualized. Moderate bone marrow and mild muscle activity were present on early images, with marrow activity decreasing and muscle activity increasing with time. Brain and lungs demonstrated activity less than blood pool. Though F-18-FACBC exhibited little renal excretion or bladder uptake during the clinically useful early imaging time window, mild to moderate activity might accumulate in the bladder and interfere with evaluation of adjacent prostate bed and seminal vesicles in 5%-10% of patients. Uptake might also occur from benign processes such as infection, inflammation, prostatic hyperplasia, and metabolically active benign bone lesions such as osteoid osteoma. Conclusion: Common physiologic uptake patterns were similar to those noted in healthy volunteers. The activity in organs followed the presence of amino acid transport and metabolism described with other amino acid-based PET radiotracers. As with other PET radiotracers such as F-18-FDG, focal nonphysiologic uptake may represent incidental malignancy. Uptake due to benign etiologies distinct from physiologic background also occurred and could lead to misinterpretations if the reader is unaware of them.
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| 56. |
- Sikk, K, et al.
(författare)
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Clinical, neuroimaging and neurophysiological features in addicts with manganese-ephedrone exposure
- 2010
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Ingår i: Acta Neurologica Scandinavica. - : Hindawi Limited. - 0001-6314 .- 1600-0404. ; 121:4, s. 237-243
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Tidskriftsartikel (refereegranskat)abstract
- Objective - To identify biomarkers supporting the clinical diagnosis of manganism in patients several years after exposure to manganese (Mn). Methods - Neurophysiological examinations, magnetic resonance imaging (MRI), single-photon emission computed tomography and fluorodeoxyglycose (FDG) positron emission tomography were performed in four former ephedrone addicts with extrapyramidal symptoms. Results - Peripheral nervous system was not affected. No patients had reduced uptake of (123)I Ioflupane in the striatum. MRI signal intensities were slightly changed in the basal ganglia. All patients showed a widespread, but not uniform, pathological pattern of FDG uptake with changes mainly located to the central part of the brain including the basal ganglia and the surrounding white matter. Conclusions - Presynaptic neurons in the nigrostriatal pathway are intact in Mn-induced parkinsonism after prolonged abstinence from ephedrone. The diagnosis is principally based on clinical signs and the history of drug abuse.
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| 57. |
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| 58. |
- Stenström, Johan, et al.
(författare)
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Carl Snoilsky och Bellman
- 2010
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Ingår i: Bellman i billed og digt. Rapport fra Bellmanfestivalen i København september-oktober 2006. - 9788779172692 ; , s. 223-241
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 59. |
- Stenström, Johan, et al.
(författare)
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Några nedslag i 1800-talets Fredmanikonografi
- 2010
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Ingår i: Bellman i billed og digt. Rapport fra Bellmanfestivalen i København september-oktober 2006. - 9788779172692 ; , s. 50-74
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 60. |
- Stilhoff Sörensen, Jens
(författare)
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Intervention and Statebuilding in Kosovo
- 2013
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Ingår i: Routledge Handbook of International Statebuilding / edited by David Chandler and Timothy D. Sisk. - London : Routledge. - 9780415677028 ; , s. 269-280
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Bokkapitel (refereegranskat)
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