Combined evaluation of myocardial perfusion and coronary morphology in the identification of subclinical CAD. Radiation exposure of 13N-ammonia PET/CT.
- Purpose: To evaluate the mean effective radiation dose of 13N-ammonia PET/CT and ECG-pulsing CT angiography (CTA) in the evaluation of myocardial perfusion, myocardial blood flow (MBF) and coronary morphology for the identification of subclinical CAD. Patients, material, methods: Following rest-stress 13N-ammonia PET/CT perfusion imaging and MBF quantification, ECG-pulsing CTA at a pulse window of 70% of the R-R cycle was performed in ten healthy controls and in sixteen individuals with cardiovascular risk factors. Individual radiation dose exposure for ECG-pulsing CTA was estimated from the dose-length product.
Synthesis and Preliminary Evaluation of 18-18F-Fluoro-4-Thia-Oleate as a PET Probe of Fatty Acid Oxidation.
- Fatty acid oxidation (FAO) is a major energy-providing process with important implications in cardiovascular, oncologic, neurologic, and metabolic diseases. A novel 4-thia oleate analog, 18-(18)F-fluoro-4-thia-oleate ((18)F-FTO), was evaluated in relationship to the previously developed palmitate analog 16-(18)F-fluoro-4-thia-palmitate ((18)F-FTP) as an FAO probe. METHODS: (18)F-FTO was synthesized from a corresponding bromoester.
Isochronous Assessment of Cardiac Metabolism and Function in Mice Using Hybrid PET/MRI.
- Recently, integrated small-animal PET/MRI prototypes that provide isochronous and coregistered datasets of morphology and function through the simultaneous acquisition of PET and MRI data have been developed. However, the need for MRI compatibility can constrain the technical design of the PET components and may lead to a lower sensitivity and lower spatial and temporal resolutions. The aim of this study was to evaluate the suitability of a prototype preclinical PET/MRI system for the simultaneous assessment of cardiac metabolism and function in mice.
Single-Phase CT Aligned to Gated PET for Respiratory Motion Correction in Cardiac PET/CT.
- Respiratory motion can induce artifacts in cardiac PET/CT because of the misregistration of the CT attenuation map and emission data. Some solutions to the respiratory motion problem use 4-dimensional CT, but this increases patient radiation exposure. Realignment of 3-dimensional CT and PET images can remove apparent uptake defects caused by mispositioning of the PET emission data into the lung regions on the CT scan.
Early molecular imaging of interstitial changes in patients after myocardial infarction: Comparison with delayed contrast-enhanced magnetic resonance imaging.
- INTRODUCTION: The clinical feasibility of noninvasive imaging of interstitial alterations after myocardial infarction (MI) was assessed using a technetium-99m-labeled RGD imaging peptide (RIP). In experimental studies, RIP has been shown to target integrins associated with collagen-producing myofibroblasts (MFB). METHODS AND RESULTS: Ten patients underwent myocardial perfusion imaging (MPI) within the first week after MI.
Impact of left ventricular dyssynchrony by phase analysis on cardiovascular outcomes in patients with end-stage renal disease.
- BACKGROUND: Cardiovascular disease is the leading cause of mortality in patients with end-stage renal disease (ESRD). While left ventricular (LV) perfusion pattern and ejection fraction (EF) are important determinant of outcome, the prognostic importance of LV dyssynchrony, which can also be assessed by gated SPECT myocardial perfusion imaging (MPI), has not been well studied in this population. METHODS AND RESULTS: The indices of LV mechanical dyssynchrony were measured by automated analysis of gated SPECT MPI in patients with ESRD who were evaluated for transplantation at our institution (2001-2004) and who had coronary angiography within 6 months of the evaluation.
Structural epicardial disease and microvascular function are determinants of an abnormal longitudinal myocardial blood flow difference in cardiovascular risk individuals as determined with PET/CT.
- BACKGROUND: The aim of this study was to determine whether epicardial structural disease may affect the manifestation of a longitudinal decrease in myocardial blood flow (MBF) or MBF difference during hyperemia in cardiovascular risk individuals, and its dependency on the flow increase. METHODS AND RESULTS: In 54 cardiovascular risk individuals (at risk) and in 26 healthy controls, MBF was measured with (13)N-ammonia and PET/CT in mL/g/min at rest and during dipyridamole stimulation. Computed tomography coronary angiography (CTA) was performed using a 64-slice CT of a PET/CT system.
Cotransfection of Vascular Endothelial Growth Factor-A and Platelet-Derived Growth Factor-B Via Recombinant Adeno-Associated Virus Resolves Chronic Ischemic Malperfusion Role of Vessel Maturation.
- OBJECTIVES: We set out to investigate the ability of cardiotropic adeno-associated viral vector (AAV2. 9 = recombinant adeno-associated virus [rAAV]) to induce prolonged expression of vascular endothelial growth factor (VEGF)-A and platelet-derived growth factor (PDGF)-B in a rabbit hindlimb ischemia model and a pig model of hibernating myocardium. BACKGROUND: Gene therapy to induce angiogenesis and arteriogenesis has produced mixed results.
Iodofiltic acid I 123 (BMIPP) fatty acid imaging improves initial diagnosis in emergency department patients with suspected acute coronary syndromes: a multicenter trial.
- OBJECTIVES: The aim of this study was to assess the performance of beta-methyl-p-[123I]-iodophenyl-pentadecanoic acid (BMIPP) single-photon emission computed tomography (SPECT) to detect acute coronary syndromes (ACS) in emergency department patients with chest pain. BACKGROUND: Emergency department diagnosis of chest pain is problematic, often requiring prolonged observation and stress testing. BMIPP SPECT detects abnormalities in fatty acid metabolism resulting from myocardial ischemia, even many hours after symptom cessation.
