Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 8 (1998), S. 1698-1706 
    ISSN: 1432-1084
    Keywords: Key words: Nuclear cardiology ; Single photon emission computed tomography ; Positron emission tomography ; Myocardial perfusion imaging ; Radionuclide angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Nuclear imaging techniques are well established diagnostic tools in clinical cardiology, providing noninvasive information about myocardial perfusion, function and metabolism. The cost-effectiveness of radionuclide imaging in the diagnostic work-up of patients with coronary artery disease has been demonstrated. Additionally, the documented prognostic value of scintigraphic parameters is of clinical importance to guide decision making. Advances in technology, new radiotracers and new applications contribute to continuous growth in the field of nuclear cardiology. Multi-headed gamma camera systems lead to higher spatial resolution and sensitivity of cardiac single photon emission tomography (SPECT), and they also provide the opportunity for attenuation correction or electrocardiographic gating of SPECT images. Objective quantitative values of perfusion, function and metabolism are derived from scintigraphic data by use of improved software and hardware. With the latest developments in tracer technology, imaging of myocardial necrosis, receptor systems and autonomic innervation has become a reality and will lead to new clinical applications in the future.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Basic research in cardiology 90 (1995), S. 58-60 
    ISSN: 1435-1803
    Keywords: Myocardial ischemia ; hibernation ; PET ; scintigraphy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1619-7089
    Keywords: Manganese ; Positron emission tomography ; Tracer kinetic modeling ; Myocardial perfusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract There is a need for a quantitative myocardial perfusion agent that does not require an on-site cyclotron. Early studies with manganese demonstrated that this trace metal is of potential use for myocardial imaging.52mMn can be produced in a52Fe-52mMn generator and is suitable for positron emission tomographic (PET) imaging. The purpose of this study was to evaluate52mMn with regard to its potential to quantitatively assess myocardial perfusion. Dynamic PET imaging was performed in six pigs with various doses of dipyridamole to increase blood flow. Retention (R) and model-basedK 1 values were correlated with microsphere blood flow. The models consisted of one (K 1,k 2) and two (K 1,k 2,k 3) tissue compartments. Anterior, lateral and septal regions showed a good myocardium-to-background ratio; the evaluation of the inferior wall was impaired by high liver uptake. Linear regression yielded the following equations:K 1=1.152 flow+0.059 (r=0.92),R=0.069 flow+0.034 (r=0.84). Based on these regressions,K 1 increased 2.7-fold andR 2.6-fold in the examined flow range of 0.5–2 ml/min/g (fourfold increase), demonstrating an underestimation of higher flow rates by both measures. It is concluded that52mMn allows the qualitative assessment of myocardial perfusion but does not meet the requirements of a quantitative myocardial perfusion agent.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nuclear medicine 24 (1997), S. 1337-1341 
    ISSN: 1619-7089
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Positronen-Emissions-Tomographie (PET) ; Neurologie ; Neurochirurgie ; Psychiatrie ; Key words Positron emission tomography ; Neurology ; Neurosurgery ; Psychiatry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary To date, positron emission tomography (PET) is the most powerful method for the in-vivo investigation of human brain metabolism. Besides extensive application of this technology in the neurosciences, PET is also being increasingly used as a clinical tool. However, despite its acceptance in clinical practice, a major obstacle is its high costs. The present article reviews the literature on the clinical use of PET in neurology, neurosurgery, and psychiatry in order to substantiate the clinical indications for PET in these specialties as established by an interdisciplinary conference.
    Notes: Zusammenfassung Die Positronen-Emissions-Tomographie (PET) ist das derzeit leistungsfähigste Verfahren zur In-vivo-Untersuchung des zerebralen Stoffwechsels. Neben einem breitgefächerten Einsatz von PET in der neuromedizinischen Forschung findet die PET zunehmend auch Eingang in die klinische Diagnostik. Dieser Entwicklung entgegen stehen die relativ hohen Kosten, die mit diesem Verfahren verbunden sind. Die vorliegende Arbeit begründet die, in einer interdisziplinären Konferenz erarbeiteten Konsensusindikationen für den klinischen Einsatz der PET in der Neurologie, Neurochirurgie und Psychiatrie durch Aufarbeitung der einschlägigen Literatur.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...