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https://www.readbyqxmd.com/read/28516232/-cns-metabolism-in-high-risk-drug-abuse-german-version-insights-gained-from-1-h-and-31-p-mrs-and-pet
#1
REVIEW
S V Bodea
BACKGROUND: High-risk drug consumption is a considerable problem for public health actors in industrialised countries. The latest trends show a market tendency towards diversification and increasing demand for high-purity synthetic drugs. Whilst most consumers seek medical help after cannabis use, it is high-risk drugs like cocaine, heroin and amphetamines that account for most of the 1000 drug-related deaths that occur in Germany every year. PURPOSE: This article presents the most prominent in vivo cerebral metabolic information in cocaine, heroin and methamphetamine users provided by MRI spectroscopy and PET imaging...
May 17, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28512714/comparison-of-the-diagnostic-accuracy-of-pet-mri-to-pet-ct-acquired-fdg-brain-exams-for-seizure-focus-detection-a-prospective-study
#2
Michael J Paldino, Erica Yang, Jeremy Y Jones, Nadia Mahmood, Andrew Sher, Wei Zhang, Shireen Hayatghaibi, Ramkumar Krishnamurthy, Victor Seghers
BACKGROUND: There is great interest in positron emission tomography (PET)/magnetic resonance (MR) as a clinical tool due to its capacity to provide diverse diagnostic information in a single exam. OBJECTIVE: The goal of this exam is to compare the diagnostic accuracy of PET/MR-acquired [F-18]2-fluoro-2-deoxyglucose (FDG) brain exams to that of PET/CT with respect to identifying seizure foci in children with localization-related epilepsy. MATERIALS AND METHODS: Institutional Review Board approval and informed consent were obtained for this Health Insurance Portability and Accountability Act-compliant, prospective study...
May 16, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28508120/effects-of-arm-truncation-on-the-appearance-of-the-halo-artifact-in-68-ga-psma-11-hbed-cc-pet-mri
#3
Ali Afshar-Oromieh, Maya Wolf, Uwe Haberkorn, Marc Kachelrieß, Regula Gnirs, Klaus Kopka, Heinz-Peter Schlemmer, Martin T Freitag
PURPOSE: PSMA ligand imaging with hybrid PET/MRI scanners could be an integral part of the clinical routine in the future. However, the first study about this novel method revealed a severe photopenic artifact ("halo artifact") around the urinary bladder causing significantly reduced tumor visibility. The aim of this evaluation was to analyze the role of arm truncation on the appearance of the halo artifact in (68)Ga-PSMA-11 PET/MRI hypothesizing that this influences the appearance. METHODS: Twenty-seven consecutive patients were subjected to (68)Ga-PSMA-11 PET/CT (1 h p...
May 15, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28501085/staging-in-esophageal-and-gastric-cancers
#4
REVIEW
Thomas Hayes, Elizabeth Smyth, Angela Riddell, William Allum
Gastric and esophageal tumors have a poor prognosis; approximately 15% of patients are alive at 10 years following diagnosis. Surgical resection plus adjunctive chemotherapy or chemoradiotherapy is curative in approximately 50% of patients with operable disease, but is also associated with significant morbidity. Therefore, accurate preoperative staging is required to spare patients unnecessary toxicity and futile surgery. This review evaluates the sensitivity and specificities of the modalities used to stage patients with gastroesophageal cancer...
June 2017: Hematology/oncology Clinics of North America
https://www.readbyqxmd.com/read/28500749/local-resectability-assessment-of-head-and-neck-cancer-positron-emission-tomography-mri-versus-positron-emission-tomography-ct
#5
Tetsuro Sekine, Felipe de Galiza Barbosa, Gaspar Delso, Irene A Burger, Paul Stolzmann, Edwin E Ter Voert, Gerhard F Huber, Spyros S Kollias, Gustav K von Schulthess, Patrick Veit-Haibach, Martin W Huellner
BACKGROUND: The purpose of this study was to compare the diagnostic accuracy of positron emission tomography (PET)/MRI with PET/CT for local resectability of head and neck cancer. METHODS: Sequential contrast-enhanced PET/CT-MRI was performed in 58 patients referred for the staging or restaging of head and neck cancer. Tumors were assessed with PET/CT and PET/MRI for the presence of resectability-defining factors: T4b status (mediastinal invasion, invasion of the prevertebral space, and vascular encasement), and another 8 findings that would imply obstacles for surgical cure (invasion of the laryngeal cartilage, invasion of the preepiglottic fat pad, perineural spread, orbital invasion, bone infiltration, skull base invasion, dural infiltration, and invasion of the brachial plexus)...
May 13, 2017: Head & Neck
https://www.readbyqxmd.com/read/28500539/hybrid-pet-ct-and-pet-mri-imaging-of-vulnerable-coronary-plaque-and-myocardial-scar-tissue-in-acute-myocardial-infarction
#6
Stephanie Marchesseau, Aruni Seneviratna, A Therese Sjöholm, Daphne Liang Qin, Jamie X M Ho, Derek J Hausenloy, David W Townsend, A Mark Richards, John J Totman, Mark Y Y Chan
BACKGROUND: Following an acute coronary syndrome, combined CT and PET with (18)F-NaF can identify coronary atherosclerotic plaques that have ruptured or eroded. However, the processes behind (18)F-NaF uptake in vulnerable plaques remain unclear. METHODS AND RESULTS: Ten patients with STEMI were scanned after (18)F-NaF injection, for 75 minutes in a Siemens PET/MR scanner using delayed enhancement (LGE). They were then scanned in a Siemens PET/CT scanner for 10 minutes...
May 12, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28495008/a-fully-automatic-approach-for-multimodal-pet-and-mr-image-segmentation-in-gamma-knife-treatment-planning
#7
Leonardo Rundo, Alessandro Stefano, Carmelo Militello, Giorgio Russo, Maria Gabriella Sabini, Corrado D'Arrigo, Francesco Marletta, Massimo Ippolito, Giancarlo Mauri, Salvatore Vitabile, Maria Carla Gilardi
BACKGROUND AND OBJECTIVES: Nowadays, clinical practice in Gamma Knife treatments is generally based on MRI anatomical information alone. However, the joint use of MRI and PET images can be useful for considering both anatomical and metabolic information about the lesion to be treated. In this paper we present a co-segmentation method to integrate the segmented Biological Target Volume (BTV), using [(11)C]-Methionine-PET (MET-PET) images, and the segmented Gross Target Volume (GTV), on the respective co-registered MR images...
June 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28489688/hybrid-pet-mri-based-delineation-of-gross-tumor-volume-in-head-and-neck-cancer-and-tumor-parameter-analysis
#8
Jie-Tao Ma, Cheng-Bo Han, Jia-He Zheng, Hong-Zan Sun, Shao-Min Zhang, Jun Xin, Qi-Yong Guo
OBJECTIVES: Accurate target delineation allows an increase in radiation dose to the target tumor while reducing damage to the surrounding normal tissue. However, there is currently no standard for evaluating volumes measured by different imaging modalities. The aim of this study is to evaluate the feasibility of contouring gross tumor volume (GTV) by PET/MRI in head and neck cancer, and to define an adaptive threshold level (aTL) for delineating the biological target volume (BTV). PATIENTS AND METHODS: Eighteen head and neck cancer patients underwent time of flight PET/MRI before chemoradiotherapy...
May 9, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28488027/fibrous-dysplasia-mimicking-bone-metastasis-on-68-ga-psma-pet-mri
#9
Liesbeth De Coster, Raf Sciot, Wouter Everaerts, Olivier Gheysens, Raf Verscuren, Christophe M Deroose, Steven Pans, Koen Van Laere, Karolien E Goffin
No abstract text is available yet for this article.
May 9, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28481958/diagnostic-role-of-18f-fdg-pet-mri-in-patients-with-gynecological-malignancies-of-the-pelvis-a-systematic-review-and-meta-analysis
#10
Ji Nie, Jing Zhang, Jinsheng Gao, Linghong Guo, Hui Zhou, Yuanyuan Hu, Chenjing Zhu, Qingfang Li, Xuelei Ma
PURPOSE: The aim of this study was to assess the diagnostic performance of 18F-FDG Positron Emission Tomography/Magnetic Resonance Imaging (PET/MRI) for gynecological cancers of the pelvis, based on a systematic review and meta-analysis of published data. METHODS: We performed a comprehensive literature search of Pubmed and Embase for studies that evaluated the diagnosis of 18F-FDG PET/MRI for gynecological malignancies in the pelvis. Quality Assessment for Studies of Diagnostic Accuracy 2 (QUADAS 2) tool was used to access the quality of included studies...
2017: PloS One
https://www.readbyqxmd.com/read/28481790/a-novel-diagnostic-strategy-using-16%C3%AE-18f-fluoro-17-%C3%AE-estradiol-18f-fes-pet-mri-to-achieve-complete-resection-of-intravenous-leiomyomatosis-in-reproductive-age-women
#11
Yoko Chino, Hideaki Tsuyoshi, Tetsuya Tsujikawa, Hidehiko Okazawa, Yoshio Yoshida
Intravenous leiomyomatosis is a life-threatening leiomyoma that grows into the extrauterine venous system. A high recurrence rate has been reported in reproductive-age women who undergo only tumor excision to preserve fertility. Precise diagnosis of tumor extension is essential to achieve complete resection. A 24-year-old woman presented with hypermenorrhea. Contrast-enhanced MRI showed an intramural myoma with worm-like extension into the right parametrium. F-FES PET/MRI accurately depicted the extension with strong FES activity into the right uterine vein, whereas F-FDG PET/MRI excluded the possibility of malignancy...
May 6, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28473594/evaluation-of-sinus-edge-corrected-zte-based-attenuation-correction-in-brain-pet-mri
#12
Jaewon Yang, Florian Wiesinger, Sandeep Kaushik, Dattesh Shanbhag, Thomas A Hope, Peder E Z Larson, Youngho Seo
Purpose: In brain positron emission tomography/magnetic resonance imaging (PET/MRI), the major challenge of zero-echo-time (ZTE)-based attenuation correction (ZTAC) is the misclassification of air/tissue/bone mixtures or their boundaries. Our study aimed to evaluate a sinus/edge corrected (SEC) ZTAC (ZTACSEC), relative to an "uncorrected (UC)" ZTAC (ZTACUC) and a computed tomography (CT) atlas-based attenuation correction (ATAC). Materials and Methods: Whole-body fluorodeoxyglucose PET/MRI scans were performed for twelve patients, following PET/CT scans...
May 4, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28472627/neuroimaging-markers-associated-with-maintenance-of-optimal-memory-performance-in-late-life
#13
Maria Dekhtyar, Kathryn V Papp, Rachel Buckley, Heidi I L Jacobs, Aaron P Schultz, Keith A Johnson, Reisa A Sperling, Dorene M Rentz
BACKGROUND: Age-related memory decline has been well-documented; however, some individuals reach their 8th-10th decade while maintaining strong memory performance. OBJECTIVE: To determine which demographic and biomarker factors differentiated top memory performers (aged 75+, top 20% for memory) from their peers and whether top memory performance was maintained over 3 years. METHODS: Clinically normal adults (n=125, CDR=0; age: 79.5±3.57 years) from the Harvard Aging Brain Study underwent cognitive testing and neuroimaging (amyloid PET, MRI) at baseline and 3-year follow-up...
May 1, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28466279/using-31-p-mri-of-hydroxyapatite-for-bone-attenuation-correction-in-pet-mri-proof-of-concept-in-the-rodent-brain
#14
Vincent Lebon, Sébastien Jan, Yoann Fontyn, Brice Tiret, Géraldine Pottier, Emilie Jaumain, Julien Valette
BACKGROUND: The correction of γ-photon attenuation in PET-MRI remains a critical issue, especially for bone attenuation. This problem is of great importance for brain studies due to the density of the skull. Current techniques for skull attenuation correction (AC) provide indirect estimates of cortical bone density, leading to inaccurate estimates of brain activity. The purpose of this study was to develop an alternate method for bone attenuation correction based on NMR. The proposed approach relies on the detection of hydroxyapatite crystals by zero echo time (ZTE) MRI of (31)P, providing individual and quantitative assessment of bone density...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28463501/hyaluronan-nanoparticles-selectively-target-plaque-associated-macrophages-and-improve-plaque-stability-in-atherosclerosis
#15
Thijs J Beldman, Max L Senders, Amr Alaarg, Carlos Pérez-Medina, Jun Tang, Yiming Zhao, Francois Fay, Jacqueline Deichmöller, Benjamin Born, Emilie Desclos, Nicole N van der Wel, Ron A Hoebe, Fortune Kohen, Elena Kartvelishvily, Michal Neeman, Thomas Reiner, Claudia Calcagno, Zahi A Fayad, Menno P J de Winther, Esther Lutgens, Willem J M Mulder, Ewelina Kluza
Hyaluronan is a biologically active polymer, which can be formulated into nanoparticles. In our study, we aimed to probe atherosclerosis-associated inflammation by using hyaluronan nanoparticles and to determine whether they can ameliorate atherosclerosis. Hyaluronan nanoparticles (HA-NPs) were prepared by reacting amine-functionalized oligomeric hyaluronan (HA) with cholanic ester and labeled with a fluorescent or radioactive label. HA-NPs were characterized in vitro by several advanced microscopy methods...
May 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28451825/using-pet-for-therapy-monitoring-in-oncological-clinical-trials-challenges-ahead
#16
C M Deroose, S Stroobants, Y Liu, L K Shankar, P Bourguet
Molecular imaging with PET has emerged as a powerful imaging tool in the clinical care of oncological patients. Assessing therapy response is a prime application of PET and so the integration of PET into multicentre trials can offer valuable scientific insights and shape future clinical practice. However, there are a number of logistic and methodological challenges that have to be dealt with. These range from availability and regulatory compliance of the PET radiopharmaceutical to availability of scan time for research purposes...
April 27, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28450555/integrating-mri-and-chemokine-receptor-cxcr4-targeted-pet-for-detection-of-leukocyte-infiltration-in-complicated-urinary-tract-infections-after-kidney-transplantation
#17
Thorsten Derlin, Faikah Gueler, Jan H Bräsen, Jessica Schmitz, Dagmar Hartung, Thomas R Herrmann, Tobias L Ross, Frank Wacker, Hans-Jürgen Wester, Marcus Hiss, Hermann Haller, Frank M Bengel, Katja Hueper
Complicated urinary tract infections (UTIs) are frequent in immunosuppressed patients after kidney transplantation and may lead to allograft failure or urosepsis. Non-invasive detection of allograft involvement as well as localization of the primary site of infection are challenging. Therefore, we sought to determine whether molecular-targeted positron emission tomography (PET), combined with diffusion-weighted magnetic resonance imaging (MRI), enables detection of leukocytes in renal allografts. Methods: Thirteen kidney transplant recipients with complicated UTIs underwent both PET with a specific CXCR4-ligand, (68)Ga-Pentixafor, and diffusion-weighted MRI...
April 27, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28450072/contribution-of-clinical-neuroimaging-to-the-understanding-of-the-pharmacology-of-methylphenidate
#18
REVIEW
Luc Zimmer
Methylphenidate (MPH) is currently the most widely used molecule in the pharmacologic treatment of attention-deficit hyperactivity disorder (ADHD). Although experience of its application now extends over several decades, its psychotropic nature, prolonged use in children, and chemical relation to amphetamines still raise doubts in the minds of prescribers and the families of the patients. Brain imaging has shed considerable light on the neuropharmacology of MPH. The two main in vivo neuroimaging techniques are positron-emission tomography (PET) and magnetic resonance imaging (MRI), and these can be applied in both animal models and humans...
April 24, 2017: Trends in Pharmacological Sciences
https://www.readbyqxmd.com/read/28445740/right-brain-left-brain-in-depressive-disorders-clinical-and-theoretical-implications-of-behavioral-electrophysiological-and-neuroimaging-findings
#19
REVIEW
Gerard E Bruder, Jonathan W Stewart, Patrick J McGrath
The right and left side of the brain are asymmetric in anatomy and function. We review electrophysiological (EEG and event-related potential), behavioral (dichotic and visual perceptual asymmetry), and neuroimaging (PET, MRI, NIRS) evidence of right-left asymmetry in depressive disorders. Recent electrophysiological and fMRI studies of emotional processing have provided new evidence of altered laterality in depressive disorders. EEG alpha asymmetry and neuroimaging findings at rest and during cognitive or emotional tasks are consistent with reduced left prefrontal activity in depressed patients, which may impair downregulation of amygdala response to negative emotional information...
April 23, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28444102/pet-mri-a-novel-hybrid-imaging-technique-major-clinical-indications-and-preliminary-experience-in-brazil
#20
Taise Vitor, Karine Minaif Martins, Tudor Mihai Ionescu, Marcelo Livorsi da Cunha, Ronaldo Hueb Baroni, Marcio Ricardo Taveira Garcia, Jairo Wagner, Guilherme de Carvalho Campos, Solange Amorim Nogueira, Elaine Gonçalves Guerra, Edson Amaro
In recent years, medical imaging with hybrid techniques has widely accepted and employed in clinical routine. PET/MRI offers significant advantages, including excellent contrast and resolution and reduced ionizing radiation, as compared to well-established PET/CT. Therefore, PET/MRI is a promising modality for oncologic imaging of some regions, such as brain, head and neck, liver and pelvis. This article set out to analyze clinical conditions that could benefit from PET/MRI imaging based on our caseload. The potential of PET/MRI to become the imaging modality of choice for assessment of neurologic and oncologic conditions associated with soft tissues is highlighted...
January 2017: Einstein
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