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  • 18F-Deoxyglucose  (1)
  • Fluorodeoxyglucose  (1)
  • Key words Breast cancer • Lymph node metastases • Positron emission tomography •18F-Fluorodeoxyglucose • Diagnosis • Therapy monitoring  (1)
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  • 1
    ISSN: 1432-2102
    Keywords: Key words Breast cancer • Lymph node metastases • Positron emission tomography •18F-Fluorodeoxyglucose • Diagnosis • Therapy monitoring ; Schlüsselwörter Mammakarzinom • Lymphknotenmetastasen • Positronenemissionstomographie • ; F-18-Fluordeoxyglukose • Diagnostik • Therapiemonitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der verstärkte Glukosestoffwechsel maligner Tumoren wird mit der Positronenemissionstomographie (PET) unter Verwendung des radioaktiv markierten Glukoseanalogons F-18-Fluordeoxyglukose (FDG) diagnostisch genutzt. In Abhängigkeit von den Beurteilungskriterien werden Mammakarzinome mit einer Sensitivität von 68 % bis 94 % erkannt. Eine wesentliche Limitation dieser Methode in der Mammadiagnostik beruht auf der deutlich eingeschränkten Sensitivität beim Nachweis kleiner Karzinome (〈 1 cm). Die Spezifität ist im Vergleich zu radiologischen Verfahren deutlich höher und liegt zwischen 84 % und 97 %. Die Positronenemissionstomographie erlaubt neben der Primärtumordiagnostik auch den Nachweis lokoregionaler Lymphknotenmetastasen. Ein Befall der axillären Lymphknoten wurde mit einer Sensitivität von 79 % erkannt. Bei Patientinnen mit kleinen Primärtumoren (Stadium pT1) betrug die Sensitivität allerdings nur 33 %, während bei größeren Primärtumoren axilläre Lymphknotenmetastasen mit einer Sensitivität von 94 % nachgewiesen wurden. Auch hier fand sich für die Positronenemissionstomographie eine hohe Spezifität von 96 % bis 100 %. Da sowohl Primärtumoren als auch Metastasen in einer Untersuchung nachgewiesen werden können, ist mit der Positronenemissionstomographie ein effektives Staging möglich. Das Ansprechen eines Tumors auf eine Therapie kann über die Änderung des Glukosestoffwechsels möglicherweise früher als mit anderen bildgebenden Verfahren beurteilt werden. Als zukünftige Indikationen für PET-Untersuchungen sind neben der Evaluierung des lokoregionalen Lymphknotenstatus, das Ganzkörperstaging, die Rezidivdiagnostik wie auch das Therapiemonitoring vorstellbar.
    Notes: Summary Based on the increased glucose metabolism of malignant tissue, positron emission tomography (PET), using the radiolabeled glucose analog 18F-fluorodeoxyglucose (FDG), allows identification of breast cancer. Based on the criteria implemented in image interpretation, sensitivity of PET imaging ranged from 68 % to 94 % with a specificity between 84 % and 97 %. However, sensitivity for small tumors (〈 1 cm) was found to be low. PET demonstrates tumor involvement of regional lymph nodes with high accuracy, predominantly in patients with advanced breast cancer. The sensitivity for the detection of axillary lymph node metastases was 79 %, increasing to 94 % in patients with primary breast tumors larger than 2 cm in diameter. Corresponding specificities were 96 and 100 %, respectively. Lymph node metastases could not be identified in four of six patients with small primary breast cancers (stage pT1), resulting in a sensitivity of only 33 % in these patients. By visualizing primary tumors and metastases in one imaging procedure, PET imaging may allow the effective staging of breast cancer patients. Response to treatment may be assessed at an earlier point than with imaging techniques currently used. Therefore, indications for PET studies in the future may be the evaluation of loco-regional lymph nodes, whole-body staging, diagnosis of local recurrence and therapy monitoring.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nuclear medicine 12 (1986), S. S62 
    ISSN: 1619-7089
    Keywords: Myocardial infarction ; Positron emission tomorgraphy ; 18F-Deoxyglucose ; 13N-Ammonia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Animal studies have shown that increased regional 18F-deoxyglucose (FDG) uptake as demonstrated by positron emission tomography (PET) in ischemic and reperfused myocardium reflects reversible tissue injury. Therefore, we studied patients with acute myocardial infarction to define the extent and severity of injury. Left ventricular segments with reduced blood flow and metabolism, as demonstrated by matching defects of flow and FDG uptake, revealed irreversible injury as evidenced by lack of functional recovery. In contrast, segments with reduced flow but maintained FDG uptake showed variable functional outcome with improvement of the average wall motion score. Thus, PET may be useful in identifying myocardium at risk which may benefit from therapeutic interventions.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1619-7089
    Keywords: Key words: Positron emission tomography ; Dual-detector coincidence imaging ; Fluorodeoxyglucose ; Lung cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Dual-head gamma cameras operated in coincidence mode are a new approach for tumour imaging using fluorine-18 fluorodeoxyglucose (FDG). The aim of this study was to assess the diagnostic accuracy of such a camera system in comparison with a full-ring positron emission tomography (PET) system in patients with lung cancer. Twenty-seven patients (1 female, 26 males, age 62±9 years) with lung cancer or indeterminate pulmonary nodules were studied on the same day with a full-ring PET scanner (Siemens ECAT EXACT) and a coincidence gamma camera system (ADAC Vertex MCD). Sixty minutes after injection of 185–370 MBq FDG, a scan of the chest was performed with the full-ring system. Approximately 2 h p.i., the coincidence camera study was performed. Coincidence gamma camera (CGC) and PET images with (PETac) and without attenuation correction (PETnac) were analysed independently by two blinded observers. In addition, FDG uptake in primary tumours and involved lymph nodes was quantified relative to normal contralateral lung (T/L ratios). All primary tumours were histologically proven. The lymph node status was histologically determined in 23 patients. In four patients, no lymph node sampling was performed because of extensive disease or concurrent illnesses. In the 27 patients, 25 primary lung cancers and two metastatic lesions were histologically diagnosed. The number of coincidences per centimetre axial field of view was 3.33±0.93×105 for the CGC and 1.09±0.36×106 for the dedicated PET system. All primary tumours (size: 4.6±2.6 cm) were correctly identified in the CGC and dedicated PET studies. T/L ratios were 4.7±2.5 for CGC and 6.9±2.8 for PETnac (P 〈0.001). Histopathological evaluation revealed lymph node metastases in 11 of 88 sampled lymph node stations (size: 2.3±1.0 cm). All lymph node metastases were identified in the PETac studies, while PETnac detected 10/11 and CGC 8/11. For positive lymph nodes that were visible in CGC and PETnac studies, T/L ratios were 3.7±2.3 for CGC and 6.6±3.1 for PETnac (P=0.02). The diameters of false-negative lymph nodes in the CGC studies were 0.75, 1.5 and 2 cm. False-positive FDG uptake in lymph nodes was found in two patients with all three imaging methods. For all lesions combined, T/L ratios in CGC relative to PETnac studies decreased significantly with decreasing lesion size (r=0.62; P〈0.001). In conclusion, compared with a full-ring PET system the sensitivity of CGC imaging for detection of lung cancer is limited by a lower image contrast which deteriorates with decreasing lesion size. Nevertheless, the ability of CGC imaging to detect pulmonary lesions with a diameter of at least 2 cm appears to be similar to that of a full-ring system. Both systems provide a similar specificity for the evaluation of lymph node involvement.
    Type of Medium: Electronic Resource
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