keyword
MENU ▼
Read by QxMD icon Read
search

Positron

keyword
https://www.readbyqxmd.com/read/29783001/laparoscopic-extraperitoneal-pelvic-lymph-node-debulking-in-locally-advanced-cervical-cancer
#1
Diaz-Feijoo Berta, Luna-Guibourg Rocio, Cabrera Silvia, Manrique Susana, Gil-Moreno Antonio
OBJECTIVE: To demonstrate the feasibility of laparoscopic extraperitoneal approach for pelvic metastatic lymph node debulking in locally advanced cervical cancer. DESIGN: Surgical video article. Canadian task force Classification III. SETTING: University Hospital PATIENT: A 52 year-old patient presented a stage IIA2 Cervical adenocarcinoma according to FIGO classification. The physical exam reported a 45 mm tumor. Positron emission tomography (PET- CT) was positive for hypermetabolic enlarged lymph nodes in left external iliac region of 1...
May 18, 2018: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/29782864/are-dopamine-receptor-and-transporter-changes-in-rett-syndrome-reflected-in-mecp2-deficient-mice
#2
Dean F Wong, Mary E Blue, James R Brašić, Ayon Nandi, Heather Valentine, Kirstie H Stansfield, Olivier Rousset, Genila Bibat, Mary E Yablonski, Michael V Johnston, Albert Gjedde, SakkuBai Naidu
In the present study we tested the claim that the dopaminergic dysfunction of Rett Syndrome (RTT) also occurs in Mecp2-deficient mice that serve as a model of the syndrome. We used positron emission tomography (PET) to image dopamine D2 receptors (D2 R) and transporters (DAT) in women with RTT and in Mecp2-deficient mice, and D1 R and D2 R density was measured in postmortem human tissue by autoradiography. Results showed 1) significantly reduced D2 R density in the striatum of women with RTT compared to control subjects...
May 18, 2018: Experimental Neurology
https://www.readbyqxmd.com/read/29782653/data-driven-gating-in-pet-influence-of-respiratory-signal-noise-on-motion-resolution
#3
Florian Büther, Iris Ernst, Lynn Johann Frohwein, Joost Pouw, Klaus Peter Schäfers, Lars Stegger
PURPOSE: Data-driven gating (DDG) approaches for positron emission tomography (PET) are interesting alternatives to conventional hardware-based gating methods. In DDG, the measured PET data themselves are utilized to calculate a respiratory signal that is subsequently used for gating purposes. The success of gating is then highly dependent on the statistical quality of the PET data. In this study we investigate how this quality determines signal noise and thus motion resolution in clinical PET scans using a center-of-mass-based (COM) DDG approach, specifically with regard to motion management of target structures in future radiotherapy planning applications...
May 21, 2018: Medical Physics
https://www.readbyqxmd.com/read/29782588/ground-glass-pulmonary-nodules-their-significance-in-oncology-patients-and-the-role-of-computer-tomography-and-18f-fluorodeoxyglucose-positron-emission-tomography
#4
Laura Evangelista, Annalori Panunzio, Elena Scagliori, Paolo Sartori
Objective: to determine the clinical significance of ground glass pulmonary nodules, either pure (GGNs) or mixed with the presence of solid component (MPNs), in patients with known pulmonary or extra-thoracic malignancies and to evaluate the role of computed tomography (CT) and positron emission tomography (PET)/CT in their diagnosis and follow-up. Methods: A total of 130 nodules in 68 patients were revealed: 119 GGNs and 11 MPNs. GGN lesions were found in 58 patients, MPNs in eight, and in two cases, both...
2018: Eur J Hybrid Imaging
https://www.readbyqxmd.com/read/29781364/pet-ct-analysis-of-21-patients-with-breast-cancer-physiological-distribution-of-18-f-choline-and-diagnostic-pitfalls
#5
Fathinul Fikri Ahmad Saad, Mohd Hazeman Zakaria, Bahunu Appanna
Objectives 18 F-choline is a useful tracer for detecting tumours with high lipogenesis. Knowledge of its biodistribution pattern is essential to recognise physiological variants. The aim of this study was to describe the physiologic distribution of 18 F-choline and pitfalls in patients with breast cancer. Methods Twenty-one consecutive patients with breast cancer (10 premenopausal and 11 postmenopausal women; mean age, 52.82 ± 10.71 years) underwent 18 F-choline positron emission tomography (PET)/computed tomography (CT) for staging...
January 1, 2018: Journal of International Medical Research
https://www.readbyqxmd.com/read/29781194/paraneoplastic-autoimmune-encephalitis-associated-with-pleomorphic-lung-carcinoma-an-autopsy-case-report
#6
Takashi Ando, Yoji Goto, Kazuo Mano, Fumio Nomura, Masako Kurashige, Masafumi Ito, Maya Mimuro, Yasushi Iwasaki, Masahisa Katsuno, Mari Yoshida
A 64-year-old man was admitted with acute onset disturbed consciousness. Cerebrospinal fluid analysis revealed pleocytosis and elevated protein, with negative cultures and PCR. Serum antibodies for autoimmune encephalitis were also negative. Brain magnetic resonance imaging (MRI) was unremarkable, but whole-body CT scan showed a tumor in the left lower lung lobe. Bronchial brush cytology demonstrated clusters of malignant cells, and 18 F-fluorodeoxyglucose positron emission tomography showed multiple lesions and increased uptake in the lung tumor...
May 20, 2018: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/29780876/memory-concerns-in-the-early-alzheimer-s-disease-prodrome-regional-association-with-tau-deposition
#7
Cecily G Swinford, Shannon L Risacher, Arnaud Charil, Adam J Schwarz, Andrew J Saykin
Introduction: Relationship between self- and informant memory concerns and tau aggregation was assessed in adults at risk for Alzheimer's disease (AD). Methods: Regional mean standardized uptake value ratios were extracted from [18 F]flortaucipir positron emission tomography (PET) scans of 82 at-risk adults in the Alzheimer's Disease Neuroimaging Initiative (ADNI) cohort. Associations between self- and informant ECog memory scores and tau aggregation were analyzed on both regional and voxelwise bases...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780872/neuropsychology-and-neuroimaging-profiles-of-amyloid-positive-versus-amyloid-negative-amnestic-mild-cognitive-impairment-patients
#8
Clémence Tomadesso, Vincent de La Sayette, Robin de Flores, Pierrick Bourgeat, Victor L Villemagne, Stéphanie Egret, Francis Eustache, Gaël Chételat
Introduction: Patients with amnestic mild cognitive impairment (aMCI) are heterogeneous as regard to their amyloid status. The present study aimed at highlighting the neuropsychological, brain atrophy, and hypometabolism profiles of amyloid-positive (Aβpos) versus amyloid-negative (Aβneg) aMCI patients. Methods: Forty-four aMCI patients and 24 Aβneg healthy controls underwent neuropsychological, structural magnetic resonance imaging and 18F-fluorodeoxyglucose positron emission tomography scans...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780869/cross-sectional-and-longitudinal-atrophy-is-preferentially-associated-with-tau-rather-than-amyloid-%C3%AE-positron-emission-tomography-pathology
#9
Brian A Gordon, Austin McCullough, Shruti Mishra, Tyler M Blazey, Yi Su, John Christensen, Aylin Dincer, Kelley Jackson, Russ C Hornbeck, John C Morris, Beau M Ances, Tammie L S Benzinger
Introduction: Structural magnetic resonance imaging is a marker of gray matter health and decline that is sensitive to impaired cognition and Alzheimer's disease pathology. Prior work has shown that both amyloid β (Aβ) and tau biomarkers are related to cortical thinning, but it is unclear what unique influences they have on the brain. Methods: Aβ pathology was measured with [18 F] AV-45 (florbetapir) positron emission tomography (PET) and tau was assessed with [18 F] AV-1451 (flortaucipir) PET in a population of 178 older adults, of which 123 had longitudinal magnetic resonance imaging assessments (average of 5...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780868/tau-positron-emission-tomography-imaging-in-tauopathies-the-added-hurdle-of-off-target-binding
#10
Laetitia Lemoine, Antoine Leuzy, Konstantinos Chiotis, Elena Rodriguez-Vieitez, Agneta Nordberg
Ligands targeting tau for use with positron emission tomography have rapidly been developed during the past several years, enabling the in vivo study of tau pathology in patients with Alzheimer's disease and related non-Alzheimer's disease tauopathies. Several candidate compounds have been developed, showing good in vitro characteristics with respect to their ability to bind tau deposits; off-target binding, however, has also been observed. In this short commentary, we briefly summarize the available in vivo and in vitro evidence pertaining to their off-target binding and discuss the different approaches that are needed for the future development of tau positron emission tomography tracers...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780867/topographic-staging-of-tau-positron-emission-tomography-images
#11
Adam J Schwarz, Sergey Shcherbinin, Lawrence J Slieker, Shannon L Risacher, Arnaud Charil, Michael C Irizarry, Adam S Fleisher, Sudeepti Southekal, Abhinay D Joshi, Michael D Devous, Bradley B Miller, Andrew J Saykin
Introduction: It has been proposed that the signal distribution on tau positron emission tomography (PET) images could be used to define pathologic stages similar to those seen in neuropathology. Methods: Three topographic staging schemes for tau PET, two sampling the temporal and occipital subregions only and one sampling cortical gray matter across the major brain lobes, were evaluated on flortaucipir F 18 PET images in a test-retest scenario and from Alzheimer's Disease Neuroimaging Initiative 2...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780866/molecular-imaging-what-is-right-and-what-is-an-illusion
#12
William E Klunk
Over the past 40 years, brain molecular imaging has evolved from measuring cerebral metabolism with fluorodeoxyglucose, to neuroreceptor imaging, to imaging pathological protein deposits. In the early going, the characteristics of successful molecular imaging radiotracers were defined, and a detailed "Process" was developed for the collection of basic pharmacodynamic and pharmacokinetic data. These data are essential for the interpretation of in vivo imaging data and for defining the strengths, weaknesses, and limitations of new tracers...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780865/elevated-medial-temporal-lobe-and-pervasive-brain-tau-pet-signal-in-normal-participants
#13
Val J Lowe, Tyler J Bruinsma, Hoon-Ki Min, Emily S Lundt, Ping Fang, Matthew L Senjem, Bradley F Boeve, Keith A Josephs, Mukesh K Pandey, Melissa E Murray, Kejal Kantarci, David T Jones, Christopher G Schwarz, David S Knopman, Ronald C Petersen, Clifford R Jack
Introduction: Medial temporal lobe (MTL) uptake on tau-positron emission tomography (PET) is seen not only in Alzheimer's disease (AD) dementia but also in the aging population. The relationship of these findings to the development of AD dementia needs to be better understood. Methods: Tau-PET with AV-1451 was performed on 576 cognitively unimpaired (CU) participants aged 50-94 years. The number of CUs with and without abnormal MTL regions and those with or without extra-MTL abnormalities was determined...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780864/change-in-retinal-structural-anatomy-during-the-preclinical-stage-of-alzheimer-s-disease
#14
Cláudia Y Santos, Lenworth N Johnson, Stuart E Sinoff, Elena K Festa, William C Heindel, Peter J Snyder
Introduction: We conducted a 27-month longitudinal study of mid-life adults with preclinical Alzheimer's disease (AD), using spectral domain optical coherence tomography to compare changes in volume and thickness in all retinal neuronal layers to those of age-matched healthy control subjects. Methods: Fifty-six older adults (mean age = 65.36 years) with multiple risk factors for AD completed spectral domain optical coherence tomography retinal imaging and cognitive testing at baseline...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780861/the-relationship-between-recall-of-recently-versus-remotely-encoded-famous-faces-and-amyloidosis-in-clinically-normal-older-adults
#15
Irina Orlovsky, Willem Huijbers, Bernard J Hanseeuw, Elizabeth C Mormino, Trey Hedden, Rachel F Buckley, Molly LaPoint, Jennifer S Rabin, Dorene M Rentz, Keith A Johnson, Reisa A Sperling, Kathryn V Papp
Introduction: Alzheimer's disease (AD) patients exhibit temporally graded memory loss with remote memories remaining more intact than recent memories. It is unclear whether this temporal pattern is observable in clinically normal adults with amyloid pathology (i.e. preclinical AD). Methods: Participants were asked to recall the names of famous figures most prominent recently (famous after 1990) and remotely (famous from 1960-1980) and were provided with a phonemic cue to ensure that memory failure was not purely due to verbal retrieval weaknesses...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780859/monoaminergic-impairment-in-down-syndrome-with-alzheimer-s-disease-compared-to-early-onset-alzheimer-s-disease
#16
Alain D Dekker, Yannick Vermeiren, Maria Carmona-Iragui, Bessy Benejam, Laura Videla, Ellen Gelpi, Tony Aerts, Debby Van Dam, Susana Fernández, Alberto Lleó, Sebastian Videla, Anne Sieben, Jean-Jacques Martin, Rafael Blesa, Juan Fortea, Peter P De Deyn
Introduction: People with Down syndrome (DS) are at high risk for Alzheimer's disease (AD). Defects in monoamine neurotransmitter systems are implicated in DS and AD but have not been comprehensively studied in DS. Methods: Noradrenaline, adrenaline, and their metabolite 3-methoxy-4-hydroxyphenylglycol (MHPG); dopamine and its metabolites 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid; and serotonin and its metabolite 5-hydroxyindoleacetic acid were quantified in 15 brain regions of DS without AD (DS, n = 4), DS with AD (DS+AD, n = 17), early-onset AD (EOAD, n = 11) patients, and healthy non-DS controls (n = 10) in the general population...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29780633/deep-learning-aided-decision-support-for-pulmonary-nodules-diagnosing-a-review
#17
REVIEW
Yixin Yang, Xiaoyi Feng, Wenhao Chi, Zhengyang Li, Wenzhe Duan, Haiping Liu, Wenhua Liang, Wei Wang, Ping Chen, Jianxing He, Bo Liu
Deep learning techniques have recently emerged as promising decision supporting approaches to automatically analyze medical images for different clinical diagnosing purposes. Diagnosing of pulmonary nodules by using computer-assisted diagnosing has received considerable theoretical, computational, and empirical research work, and considerable methods have been developed for detection and classification of pulmonary nodules on different formats of images including chest radiographs, computed tomography (CT), and positron emission tomography in the past five decades...
April 2018: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29780624/diagnostic-performance-of-fluorine-18-fluorodeoxyglucose-positron-emission-tomography-in-the-management-of-solitary-pulmonary-nodule-a-meta-analysis
#18
Duilio Divisi, Mirko Barone, Luca Bertolaccini, Gino Zaccagna, Francesca Gabriele, Roberto Crisci
Background: In the setting of solitary pulmonary nodules (SPNs), fluorine-18 fluorodeoxyglucose positron emission tomography/computed tomography (18 F-FDG-PET/CT) is considered a useful non-invasive diagnostic tool though false positive (FP) and false negative (FN) results affects accuracy due to different conditions, such as inflammatory diseases or low-uptake neoplasms. Aim of this study is to evaluate overall diagnostic performance of 18 F-FDG-PET/CT for malignant pulmonary nodules...
April 2018: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29780105/a-case-of-longstanding-igg4-related-ophthalmic-disease-dramatically-improved-after-steroid-therapy
#19
Yoko Hirata, Jiro Fukae, Akihiro Nishida, Shinsuke Fujioka, Mokoto Hamasaki, Masanari Nonokuma, Yoshio Tsuboi
A 61-year-old man was admitted to our hospital because of decreased visual acuity. On admission, he had marked blepharoedema, conjunctival injection, exophthalmos, diplopia, and blurred vision. He also had bronchial asthma and urinary retention requiring urethral catheterization. His serum immunoglobulin (Ig) G4 level was elevated to 1,830 U/mL. Fluorodeoxyglucose-positron emission tomography revealed an abnormal uptake in multiple organs. A histopathological examination of the salivary gland revealed IgG4-positive plasma cell infiltration, leading to a diagnosis of IgG4-related ophthalmic disease...
May 18, 2018: Internal Medicine
https://www.readbyqxmd.com/read/29780071/symptomatic-remote-cyst-after-bcnu-wafer-implantation-for-malignant-glioma
#20
Hideaki Matsumura, Eiichi Ishikawa, Masahide Matsuda, Noriaki Sakamoto, Hiroyoshi Akutsu, Shingo Takano, Akira Matsumura
A 43-year-old man was operated on for right frontal oligoastrocytoma. 14 years after the surgery, magnetic resonance imaging and positron emission tomography revealed a new lesion near the surgical cavity. He underwent gross total resection of the lesion and implantation of bis-chloroethylnitrosourea (BCNU) wafers after intraoperative pathological diagnosis of recurrent high-grade glioma. A few days after the operation, the level of consciousness gradually worsened and left hemiparesis developed. A computed tomography scan revealed a cyst remote to the surgical cavity which did not exist 3 days prior...
May 21, 2018: Neurologia Medico-chirurgica
keyword
keyword
25947
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"