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positron emission tomography perfusion

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https://www.readbyqxmd.com/read/29142357/single-coronary-artery-demonstrating-slightly-decreased-13-nh3-stress-flows-in-its-distal-flow-territories
#1
Sabrine Q Kol, Jouke J Boer, Friso M van der Zant, Remco J J Knol
A 54-year-old male patient was referred for computed tomography angiography to rule out cardiovascular disease. The examination revealed a single coronary artery originating from the right sinus of Valsalva, extending to the normal left circumflex artery and left anterior descending artery domains. The computed tomography showed only mild coronary sclerosis. The myocardial stress flow on the subsequently performed (13)NH3 myocardial perfusion positron emission tomography demonstrated a relative stress flow reduction in the distal segments along the monocoronary...
October 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/29130567/treatment-strategies-in-coronary-microvascular-dysfunction-a-systematic-review-of-interventional-studies
#2
Hannah E Suhrs, Marie M Michelsen, Eva Prescott
Coronary microvascular dysfunction has been associated with a wide spectrum of diseases and conditions, and it has proven to be a strong prognostic marker of morbidity and mortality. Despite increased attention guideline-based treatment recommendations are lacking. We performed a systematic review of pharmacological and non-pharmacological interventions to improve coronary perfusion, assessed by intracoronary Doppler, transthoracic Doppler echocardiography, positron emission tomography, cardiac magnetic resonance imaging, transthoracic contrast perfusion echocardiography and dilution techniques...
November 11, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29119262/role-of-cardiac-pet-in-clinical-practice
#3
REVIEW
Brian M Salata, Parmanand Singh
Early identification of atherosclerosis and at-risk lesions plays a critical role in reducing the burden of cardiovascular disease. While invasive coronary angiography serves as the gold standard for diagnosing coronary artery disease, non-invasive imaging techniques provide visualization of both anatomical and functional atherosclerotic processes prior to clinical presentation. The development of cardiac positron emission tomography (PET) has greatly enhanced our capability to diagnose and treat patients with early stages of atherosclerosis...
November 9, 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/29114181/kinetic-modelling-of-infection-tracers-18-f-fdg-68-ga-ga-citrate-11-c-methionine-and-11-c-donepezil-in-a-porcine-osteomyelitis-model
#4
Lars Jødal, Svend B Jensen, Ole L Nielsen, Pia Afzelius, Per Borghammer, Aage K O Alstrup, Søren B Hansen
Introduction: Positron emission tomography (PET) is increasingly applied for infection imaging using [(18)F]FDG as tracer, but uptake is unspecific. The present study compares the kinetics of [(18)F]FDG and three other PET tracers with relevance for infection imaging. Methods: A juvenile porcine osteomyelitis model was used. Eleven pigs underwent PET/CT with 60-minute dynamic PET imaging of [(18)F]FDG, [(68)Ga]Ga-citrate, [(11)C]methionine, and/or [(11)C]donepezil, along with blood sampling...
2017: Contrast Media & Molecular Imaging
https://www.readbyqxmd.com/read/29114177/associations-between-18-f-fdg-pet-dwi-and-dce-parameters-in-patients-with-head-and-neck-squamous-cell-carcinoma-depend-on-tumor-grading
#5
Leonard Leifels, Sandra Purz, Patrick Stumpp, Stefan Schob, Hans Jonas Meyer, Thomas Kahn, Osama Sabri, Alexey Surov
Our purpose was to analyze associations between positron emission tomography (PET), diffusion weighted imaging (DWI), and dynamic contrast-enhanced (DCE) imaging in patients with head and neck squamous cell carcinoma (HNSCC). The study involved 34 patients (9 women, 25 men, mean age: 56.7 ± 10.2 years). In all patients a simultaneous (18)F-FDG-PET/MR was performed. DWI was obtained by using of an axial EPI sequence. Minimal ADC values (ADCmin), mean ADC values (ADCmean), and maximal ADC values (ADCmax) were estimated...
2017: Contrast Media & Molecular Imaging
https://www.readbyqxmd.com/read/29110288/myocardial-perfusion-imaging-lessons-learned-and-work-to-be-done-update
#6
Ami E Iskandrian, Vasken Dilsizian, Ernest V Garcia, Rob S Beanlands, Manuel Cerqueira, Prem Soman, Daniel S Berman, Alberto Cuocolo, Andrew J Einstein, Charity J Morgan, Fadi G Hage, Heinrich R Schelbert, Jeroen J Bax, Joseph C Wu, Leslee J Shaw, Mehran M Sadeghi, Nagara Tamaki, Philipp A Kaufmann, Robert Gropler, Sharmila Dorbala, William Van Decker
As the second term of our commitment to Journal begins, we, the editors, would like to reflect on a few topics that have relevance today. These include prognostication and paradigm shifts; Serial testing: How to handle data? Is the change in perfusion predictive of outcome and which one? Ischemia-guided therapy: fractional flow reserve vs perfusion vs myocardial blood flow; positron emission tomography (PET) imaging using Rubidium-82 vs N-13 ammonia vs F-18 Flurpiridaz; How to differentiate microvascular disease from 3-vessel disease by PET? The imaging scene outside the United States, what are the differences and similarities? Radiation exposure; Special issues with the new cameras? Is attenuation correction needed? Are there normal databases and are these specific to each camera system? And finally, hybrid imaging with single-photon emission tomography or PET combined with computed tomography angiography or coronary calcium score...
November 6, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29077582/neuroimaging-in-the-diagnosis-of-chronic-traumatic-encephalopathy-a-systematic-review
#7
Philip Sparks, Tim Lawrence, Stephan Hinze
OBJECTIVE: Chronic traumatic encephalopathy (CTE) is a neurodegenerative tauopathy associated with repeated subconcussive and concussive head injury. Clinical features include cognitive, behavioral, mood, and motor impairments. Definitive diagnosis is only possible at postmortem. Here, the utility of neuroimaging in the diagnosis of CTE is evaluated by systematically reviewing recent evidence for changes in neuroimaging biomarkers in suspected cases of CTE compared with controls. DATA SOURCES: Providing an update on a previous systematic review of articles published until December 2014, we searched for articles published between December 2014 and July 2016...
October 25, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29072856/sex-differences-in-estimated-brain-metabolism-in-relation-to-body-growth-through-adolescence
#8
Simon N Vandekar, Haochang Shou, Theodore D Satterthwaite, Russell T Shinohara, Alison K Merikangas, David R Roalf, Kosha Ruparel, Adon Rosen, Efstathios D Gennatas, Mark A Elliott, Christos Davatzikos, Ruben C Gur, Raquel E Gur, John A Detre
The human brain consumes a disproportionate amount of the body's overall metabolic resources, and evidence suggests that brain and body may compete for substrate during development. Using perfusion MRI from a large cross-sectional cohort, we examined developmental changes of MRI-derived estimates of brain metabolism, in relation to weight change. Nonlinear models demonstrated that, in childhood, changes in body weight were inversely related to developmental age-related changes in brain metabolism. This inverse relationship persisted through early adolescence, after which body and brain metabolism began to decline...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29053782/seizure-onset-zone-localization-using-postictal-hypoperfusion-detected-by-arterial-spin-labelling-mri
#9
Ismael Gaxiola-Valdez, Shaily Singh, Tefani Perera, Sherry Sandy, Emmy Li, Paolo Federico
Neurological dysfunction following epileptic seizures is a well-recognized phenomenon. Several potential mechanisms have been suggested to explain postictal dysfunction, with alteration in cerebral blood flow being one possibility. These vascular disturbances may be long lasting and localized to brain areas involved in seizure generation and propagation, as supported by both animal and human studies. Therefore, measuring perfusion changes in the postictal period may help localize the seizure onset zone. Arterial spin labelling is a non-invasive, rapid and reproducible magnetic resonance imaging technique that measures cerebral perfusion...
November 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29051079/reduced-myocardial-flow-reserve-is-associated-with-diastolic-dysfunction-and-decreased-left-atrial-strain-in-patients-with-normal-ejection-fraction-and-epicardial-perfusion
#10
Matthew C Konerman, Joshua C Greenberg, Theodore J Kolias, James R Corbett, Ravi V Shah, Venkatesh L Murthy, Scott L Hummel
INTRODUCTION: Coronary microvascular dysfunction (MVD) may contribute to the pathogenesis of heart failure with preserved ejection fraction (HFpEF). Speckle-tracking echocardiography is a feasible and reproducible method for identifying abnormalities in left ventricular (LV) and left atrial (LA) function among HFpEF patients. By assessing myocardial flow reserve (MFR), positron emission tomography (PET) imaging enables quantitative assessment of coronary MVD. We hypothesized that, in patients with risk factors for HFpEF and normal epicardial perfusion on cardiac PET, abnormal MFR is associated with LV diastolic dysfunction (DD) and reduced LV and LA strain...
October 16, 2017: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/29047385/fully-quantitative-cardiovascular-magnetic-resonance-myocardial-perfusion-ready-for-clinical-use-a-comparison-between-cardiovascular-magnetic-resonance-imaging-and-positron-emission-tomography
#11
Henrik Engblom, Hui Xue, Shahnaz Akil, Marcus Carlsson, Cecilia Hindorf, Jenny Oddstig, Fredrik Hedeer, Michael S Hansen, Anthony H Aletras, Peter Kellman, Håkan Arheden
BACKGROUND: Recent studies have shown that quantification of myocardial perfusion (MP) at stress and myocardial perfusion reserve (MPR) offer additional diagnostic and prognostic information compared to qualitative and semi-quantitative assessment of myocardial perfusion distribution in patients with coronary artery disease (CAD). Technical advancements have enabled fully automatic quantification of MP using cardiovascular magnetic resonance (CMR) to be performed in-line in a clinical workflow...
October 19, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29041875/-myocardial-perfusion-imaging-modalities-what-do-we-really-see
#12
A A Ansheles, B V Sergienko
Assessment of perfusion, severity of ischemia and the volume of viable myocardium, including single-photon or positron emission tomography (SPECT and PET) is one of the most important stages of examination of patients with ischemic heart disease. However, in recent years "perfusion" prefix was added to other cardiologic modalities (echocardiography, magnetic resonance and computed tomography). Such a terminological uncertainty leads cardiologists to an erroneous evaluation of real possibilities of these methods...
July 2017: Kardiologiia
https://www.readbyqxmd.com/read/29032954/coronary-flow-reserve-is-predictive-of-the-risk-of-cardiovascular-death-regardless-of-chronic-kidney-disease-stage
#13
David M Charytan, Hicham Skali, Nishant R Shah, Vikas Veeranna, Michael K Cheezum, Viviany R Taqueti, Takashi Kato, Courtney R Bibbo, Jon Hainer, Sharmila Dorbala, Ron Blankstein, Marcelo F Di Carli
Microvascular rarefaction is found in experimental uremia, but data from patients with chronic kidney disease (CKD) are limited. We therefore quantified absolute myocardial blood flow and coronary flow reserve (the ratio of peak to resting flow) from myocardial perfusion positron emission tomography scans at a single institution. Individuals were classified into standard CKD categories based on the estimated glomerular filtration rate. Associations of coronary flow reserve with CKD stage and cardiovascular mortality were analyzed in models adjusted for cardiovascular risk factors...
October 13, 2017: Kidney International
https://www.readbyqxmd.com/read/29018244/bioengineering-of-functional-human-induced-pluripotent-stem-cell-derived-intestinal-grafts
#14
Kentaro Kitano, Dana M Schwartz, Haiyang Zhou, Sarah E Gilpin, Gregory R Wojtkiewicz, Xi Ren, Cesar A Sommer, Amalia V Capilla, Douglas J Mathisen, Allan M Goldstein, Gustavo Mostoslavsky, Harald C Ott
Patients with short bowel syndrome lack sufficient functional intestine to sustain themselves with enteral intake alone. Transplantable vascularized bioengineered intestine could restore nutrient absorption. Here we report the engineering of humanized intestinal grafts by repopulating decellularized rat intestinal matrix with human induced pluripotent stem cell-derived intestinal epithelium and human endothelium. After 28 days of in vitro culture, hiPSC-derived progenitor cells differentiate into a monolayer of polarized intestinal epithelium...
October 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28987196/overview-of-neuroradiology
#15
Elna-Marie Larsson, Johan Wikström
Neuroradiology with computed tomography (CT) and magnetic resonance imaging (MRI) is essential for the initial evaluation of patients with a clinical suspicion of brain and spine disorders. Morphologic imaging is required to obtain a probable diagnosis to support the treatment decisions in pre- and perinatal disorders, vascular diseases, traumatic injuries, metabolic disorders, epilepsy, infection/inflammation, neurodegenerative disorders, degenerative spinal disease, and tumors of the central nervous system...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/28984894/a-joint-procedural-position-statement-on-imaging-in-cardiac-sarcoidosis-from-the-cardiovascular-and-inflammation-infection-committees-of-the-european-association-of-nuclear-medicine-the-european-association-of-cardiovascular-imaging-and-the-american-society
#16
(no author information available yet)
This joint position paper illustrates the role and the correct use of echocardiography, radionuclide imaging with 18F-fluorodeoxyglucose positron emission tomography, radionuclide myocardial perfusion imaging and cardiovascular magnetic resonance imaging for the evaluation and management of patients with known or suspected cardiac sarcoidosis. This position paper will aid in standardizing imaging for cardiac sarcoidosis and may facilitate clinical trials and pooling of multi-centre data on cardiac sarcoidosis...
October 1, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28982786/preoperative-cerebral-oxygen-extraction-fraction-imaging-generated-from-7t-mr-quantitative-susceptibility-mapping-predicts-development-of-cerebral-hyperperfusion-following-carotid-endarterectomy
#17
J-I Nomura, I Uwano, M Sasaki, K Kudo, F Yamashita, K Ito, S Fujiwara, M Kobayashi, K Ogasawara
BACKGROUND AND PURPOSE: Preoperative hemodynamic impairment in the affected cerebral hemisphere is associated with the development of cerebral hyperperfusion following carotid endarterectomy. Cerebral oxygen extraction fraction images generated from 7T MR quantitative susceptibility mapping correlate with oxygen extraction fraction images on positron-emission tomography. The present study aimed to determine whether preoperative oxygen extraction fraction imaging generated from 7T MR quantitative susceptibility mapping could identify patients at risk for cerebral hyperperfusion following carotid endarterectomy...
October 5, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28966019/n-terminal-pro-b-type-natriuretic-peptide-and-high-sensitivity-cardiac-troponin-t-levels-are-related-to-the-extent-of-hibernating-myocardium-in-patients-with-ischemic-heart-failure
#18
Jason G E Zelt, Peter P Liu, Fernanda Erthal, Robert A deKemp, George Wells, Eileen O'Meara, Linda Garrard, Rob S B Beanlands, Lisa M Mielniczuk
BACKGROUND: Increased N-terminal pro b-type natriuretic peptide (NT-proBNP) and high-sensitivity cardiac troponin T (hs-cTnT) can identify patients with heart failure (HF) who are at increased risk of cardiac events. The relationship of these biomarkers to the extent of hibernating myocardium and scar has not been previously characterized in patients with ischemic left ventricular dysfunction and HF. METHODS: Patients with ischemic HF meeting recruitment criteria and undergoing perfusion and fluorodeoxyglucose-positron emission tomography to define myocardial hibernation and scar were included in the study...
November 2017: Canadian Journal of Cardiology
https://www.readbyqxmd.com/read/28959496/cerebral-misery-perfusion-due-to-carotid-occlusive-disease
#19
REVIEW
Mohana Maddula, Nikola Sprigg, Philip M Bath, Sunil Munshi
PURPOSE: Cerebral misery perfusion (CMP) is a condition where cerebral autoregulatory capacity is exhausted, and cerebral blood supply in insufficient to meet metabolic demand. We present an educational review of this important condition, which has a range of clinical manifestations. METHOD: A non-systematic review of published literature was undertaken on CMP and major cerebral artery occlusive disease, using Pubmed and Sciencedirect. FINDINGS: Patients with CMP may present with strokes in watershed territories, collapses and transient ischaemic attacks or episodic movements associated with an orthostatic component...
June 2017: Stroke and Vascular Neurology
https://www.readbyqxmd.com/read/28956115/ct-myocardial-perfusion-imaging-ready-for-prime-time
#20
EDITORIAL
Richard A P Takx, Csilla Celeng, U Joseph Schoepf
The detection of functional coronary artery stenosis with coronary CT angiography (CCTA) is suboptimal. Additional CT myocardial perfusion imaging (CT-MPI) may be helpful to identify patients with myocardial ischaemia in whom coronary revascularization therapy would be beneficial. CT-MPI adds incremental diagnostic and prognostic value over obstructive disease on CCTA. It allows for the quantitation of myocardial blood flow and calculation of coronary flow reserve and shows good correlation with (15)O-H2O positron emission tomography and invasive fractional flow reserve...
September 27, 2017: European Radiology
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