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PET MR

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https://www.readbyqxmd.com/read/28444763/manganese-concentration-mapping-in-the-rat-brain-with-mri-pet-and-autoradiography
#1
Geoffrey J Topping, Andrew Yung, Paul Schaffer, Cornelia Hoehr, Rick Kornelsen, Piotr Kozlowski, Vesna Sossi
PURPOSE: Mn(2+) is used a contrast agent and marker for neuronal activity with magnetic resonance imaging (MRI) in rats and mice, but its accumulation is generally not assessed quantitatively. In this work, non-radioactive Mn and (52) Mn are injected simultaneously in rats, and imaged with MRI, positron emission tomography (PET) and autoradiography (AR). Mn distributions are compared between modalities, to assess the potential and limitations on quantification of Mn with MRI, and to investigate the potential of multimodal measurement of Mn accumulation...
April 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28441783/comparison-between-mr-perfusion-and-18f-fdg-pet-in-differentiating-tumor-recurrence-from-nonneoplastic-contrast-enhancing-tissue
#2
Yogesh Kumar, Nishant Gupta, Manisha Mangla, Kusum Hooda, Rajiv Mangla
Objective: Comparison of the accuracy of MR perfusion and 18-FDG-PET for differentiating tumor progression from nonneoplastic contrast-enhancing tissue. Methods and Materials: Retrospective review of MR perfusion and 18-FDG-PET in 23 cases of primary brain tumors (17 high grade and 6 low grade glial neoplasms) and 5 cases of metastatic lesions with enhancing lesions on post-treatment MRI was performed. The accuracy of MR perfusion versus 18-FDG-PET for distinguishing between nonneoplastic contrast-enhancing tissue and tumor recurrence was assessed...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28436851/synergistic-pet-and-sense-mr-image-reconstruction-using-joint-sparsity-regularization
#3
Abolfazl Mehranian, Martin Belzunce, Claudia Prieto, Alexander Hammers, Andrew Reader
In this work we propose a generalized joint sparsity regularization prior and reconstruction framework for the syner-gistic reconstruction of PET and undersampled sensitivity en-coded (SENSE) MRI data with the aim of improving image quality beyond that obtained through conventional independent recon-structions. The proposed prior improves upon the joint total vari-ation (TV) using a non-convex potential function that assigns a rel-atively lower penalty for the PET and MR gradients whose mag-nitudes are jointly large, thus permitting the preservation and for-mation of common boundaries irrespective of their relative orien-tation...
April 18, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28432674/partial-volume-correction-of-brain-pet-studies-using-iterative-deconvolution-in-combination-with-hypr-denoising
#4
Sandeep S V Golla, Mark Lubberink, Bart N M van Berckel, Adriaan A Lammertsma, Ronald Boellaard
BACKGROUND: Accurate quantification of PET studies depends on the spatial resolution of the PET data. The commonly limited PET resolution results in partial volume effects (PVE). Iterative deconvolution methods (IDM) have been proposed as a means to correct for PVE. IDM improves spatial resolution of PET studies without the need for structural information (e.g. MR scans). On the other hand, deconvolution also increases noise, which results in lower signal-to-noise ratios (SNR). The aim of this study was to implement IDM in combination with HighlY constrained back-PRojection (HYPR) denoising to mitigate poor SNR properties of conventional IDM...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28430616/evaluation-of-pituitary-uptake-incidentally-identified-on-18f-fdg-pet-ct-scan
#5
Huijun Ju, Jinxin Zhou, Yu Pan, Jing Lv, Yifan Zhang
The clinical significance of pituitary uptake on routine whole body 18F-fluorodeoxyglucose (FDG) positron emission tomography/computer tomography (PET/CT) is not completely characterized. We seek to assess the potential differential diagnosis/underlying etiology of pituitary FDG uptake incidentally identified on routine PET/CT scans. A total of 24,007 PET/CT whole body scans in recent 5 years were retrospectively reviewed. Patients with maximum standardized uptake value (SUVmax) > 4.1 in the pituitary glands were identified...
February 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28427220/multiparametric-imaging-using-18f-fdg-pet-ct-heterogeneity-parameters-and-functional-mri-techniques-prognostic-significance-in-patients-with-primary-advanced-oropharyngeal-or-hypopharyngeal-squamous-cell-carcinoma-treated-with-chemoradiotherapy
#6
Sheng-Chieh Chan, Nai-Ming Cheng, Chia-Hsun Hsieh, Shu-Hang Ng, Chien-Yu Lin, Tzu-Chen Yen, Cheng-Lung Hsu, Hung-Ming Wan, Chun-Ta Liao, Kai-Ping Chang, Jiun-Jie Wang
BACKGROUND: In this study, PET heterogeneity was combined with functional MRI techniques to refine the prediction of prognosis in patients with oropharyngeal or hypopharyngeal squamous cell carcinoma (OHSCC). METHODS: A total of 124 patients with primary advanced OHSCC who underwent pretreatment 18F-FDG PET/CT, dynamic contrast-enhanced MR imaging (DCE-MRI), and diffusion-weighted MR imaging (DWI) were enrolled. Conventional and heterogeneity parameters from 18F-FDG PET as well as perfusion parameters from DCE-MRI and diffusion parameter from DWI of primary tumors were analyzed in relation to recurrence-free survival (RFS) and overall survival (OS)...
March 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28426162/motion-corrected-simultaneous-cardiac-positron-emission-tomography-and-coronary-mr-angiography-with-high-acquisition-efficiency
#7
Camila Munoz, Radhouene Neji, Gastão Cruz, Andrew Mallia, Sami Jeljeli, Andrew J Reader, Rene M Botnar, Claudia Prieto
PURPOSE: Develop a framework for efficient free-breathing simultaneous whole-heart coronary magnetic resonance angiography (CMRA) and cardiac positron emission tomography (PET) on a 3 Tesla PET-MR system. METHODS: An acquisition that enables nonrigid motion correction of both CMRA and PET has been developed. The proposed method estimates translational motion from low-resolution 2D MR image navigators acquired at each heartbeat and 3D nonrigid respiratory motion between different respiratory bins from the CMRA data itself...
April 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28421854/reduction-of-bold-interference-in-pseudo-continuous-arterial-spin-labeling-towards-quantitative-fmri
#8
Geoffrey Warnock, Pinar S Özbay, Felix P Kuhn, Daniel Nanz, Alfred Buck, Andreas Boss, Cristina Rossi
Fluctuations in blood-oxygenation level dependent (BOLD) signal and perfusion affect the quantification of changes in cerebral blood flow (CBF), coupled to neuronal activity, in arterial spin labeling (ASL). Subtraction methods for control and labeled MR images (i.e. pair-wise, surround subtraction, and subtraction of sinc-interpolated images), postulated to mitigate this interference in pseudo-continuous ASL (pCASL), were evaluated by comparison with quantitative (15)O-water PET. At rest, a good agreement in the CBF values was found between PET and MRI for each of the subtraction methods...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28421406/whole-body-mri-with-qualitative-and-quantitative-analysis-of-dwi-for-assessment-of-bone-marrow-involvement-in-lymphoma
#9
Annalisa Balbo-Mussetto, Chiara Saviolo, Alberto Fornari, Daniela Gottardi, Massimo Petracchini, Annalisa Macera, Chiara Valentina Lario, Teresa Gallo, Corrado Tarella, Stefano Cirillo
AIM: Our study aimed to investigate the role of qualitative and quantitative whole body MRI with DWI for assessment of bone marrow involvement (BMI) in newly diagnosed lymphoma using FDG PET-CT and bone marrow biopsy (BMB) as reference standard. MATERIALS AND METHODS: We retrospectively evaluated 56 patients with newly diagnosed lymphoma (21 Hodgkin's lymphoma and 35 non-Hodgkin's lymphoma) who underwent random unilateral BMB, FDG PET-CT and Wb-MRI-DWI for initial staging...
April 18, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28419815/diagnostic-performance-of-and-breast-tissue-changes-at-early-breast-mr-imaging-surveillance-in-women-after-breast-conservation-therapy
#10
Eun Jeong Kim, Bong Joo Kang, Sung Hun Kim, In Kyung Youn, Ji Eun Baek, Hyun Sil Lee
Purpose To investigate the diagnostic performance and tissue changes in early (1 year or less) breast magnetic resonance (MR) imaging surveillance in women who underwent breast conservation therapy for breast cancer. Materials and Methods This prospective study was approved by the institutional review board, and written informed consent was obtained. Between April 2014 and June 2016, 414 women (mean age, 51.5 years; range, 21-81 years) who underwent 422 early surveillance breast MR imaging examinations (median, 6...
April 18, 2017: Radiology
https://www.readbyqxmd.com/read/28417857/nuclear-medicine-imaging-in-pediatric-infection-or-chronic-inflammatory-diseases
#11
REVIEW
Alberto Signore, Andor W J M Glaudemans, Olivier Gheysens, Chiara Lauri, Onofrio A Catalano
In this review article, we focus on the most recent applications of nuclear medicine techniques (mainly (99m)Tc/(111)In white blood cells (WBC) scan, [(18)F]-FDG-PET/CT, [(18)F]-FDG-PET/MRI, and (99m)Tc-IL-2 scintigraphy) in the study of children affected by peripheral bone osteomyelitis, fungal infections, inflammatory bowel diseases, and type 1 diabetes, owing to recent important published evidences of their role in the management of these diseases. For osteomyelitis in children, both bone scintigraphy and [(18)F]-FDG-PET have a major advantage of assessing the whole body in one imaging session to confirm or exclude multifocal involvement, whereas WBC scan has a limited role...
May 2017: Seminars in Nuclear Medicine
https://www.readbyqxmd.com/read/28411681/breast-pet-mr-imaging
#12
REVIEW
Amy Melsaether, Linda Moy
Breast and whole-body PET/MR imaging is being used to detect local and metastatic disease and is being investigated for potential imaging biomarkers, which may eventually help personalize treatments and prognoses. This article provides an overview of breast and whole-body PET/MR exam techniques, summarizes PET and MR breast imaging for lesion detection, outlines investigations into multi-parametric breast PET/MR, looks at breast PET/MR in the setting of neo-adjuvant chemotherapy, and reviews the pros and cons of whole-body PET/MR in the setting of metastatic or suspected metastatic breast cancer...
May 2017: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/28403942/mr-signal-fat-fraction-analysis-and-t2-weighted-imaging-measure-bat-reliably-on-humans-without-cold-exposure
#13
Milja Holstila, Marko Pesola, Teemu Saari, Kalle Koskensalo, Juho Raiko, Ronald J H Borra, Pirjo Nuutila, Riitta Parkkola, Kirsi A Virtanen
OBJECTIVE: Brown adipose tissue (BAT) is compositionally distinct from white adipose tissue (WAT) in terms of triglyceride and water content. In adult humans, the most significant BAT depot is localized in the supraclavicular area. Our aim is to differentiate brown adipose tissue from white adipose tissue using fat T2* relaxation time mapping and signal-fat-fraction (SFF) analysis based on a commercially available modified 2-point-Dixon (mDixon) water-fat separation method. We hypothesize that magnetic resonance (MR) imaging can reliably measure BAT regardless of the cold-induced metabolic activation, with BAT having a significantly higher water and iron content compared to WAT...
May 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28401505/cardiac-applications-of-pet-mr
#14
REVIEW
Peter J Bergquist, Michael S Chung, Anja Jones, Mark A Ahlman, Charles S White, Jean Jeudy
PURPOSE OF REVIEW: The purpose of this study was to provide an overview of the clinical applications of PET-MR in the setting of cardiac imaging with emphasis on specific scenarios where both techniques together provided added information. RECENT FINDINGS: Synergy of cardiac PET and MR fusion may hold similar promise eliminating ionizing radiation and improving tissue contrast. Future development of new hybrid scanners, use of new imaging tracers, and clinical applications are significant factors which will influence its use...
May 2017: Current Cardiology Reports
https://www.readbyqxmd.com/read/28401244/integrated-68-ga-hbed-cc-psma-pet-mri-in-patients-with-suspected-recurrent-prostate-cancer
#15
Susanne Lütje, Joseph Cohnen, Benedikt Gomez, Johannes Grüneisen, Lino Sawicki, Herbert Rübben, Andreas Bockisch, Lale Umutlu, Thorsten D Pöppel, Axel Wetter
AIM: Evaluate the diagnostic accuracy of (68)Ga-labeled HBED-CC-PSMA-PET/MRI for detection of recurrent PCa in comparison to PET/CT. METHODS: 48 patients with suspected recurrent PCa underwent PET/CT after injection of the (68)Ga-HBED-CC-PSMA ligand followed by integrated PET/MRI. Image analysis was performed by nuclear medicine physicians and radiologists with respect to the detection of lymph node metastases, bone metastases and local recurrence of the tumour...
April 12, 2017: Nuklearmedizin. Nuclear Medicine
https://www.readbyqxmd.com/read/28401173/history-and-future-technical-innovation-in-positron-emission-tomography
#16
REVIEW
Terry Jones, David Townsend
Instrumentation for positron emission tomography (PET) imaging has experienced tremendous improvements in performance over the past 60 years since it was first conceived as a medical imaging modality. Spatial resolution has improved by a factor of 10 and sensitivity by a factor of 40 from the early designs in the 1970s to the high-performance scanners of today. Multimodality configurations have emerged that combine PET with computed tomography (CT) and, more recently, with MR. Whole-body scans for clinical purposes can now be acquired in under 10 min on a state-of-the-art PET/CT...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28391791/molecular-and-metabolic-imaging-in-multiple-sclerosis
#17
REVIEW
Marcello Moccia, Olga Ciccarelli
Multiple sclerosis is a multifactorial disease with heterogeneous pathogenetic mechanisms, which deserve to be studied to evaluate new possible targets for treatments and improve patient management. MR spectroscopy and PET allow assessing in vivo the molecular and metabolic mechanisms underlying the pathogenesis of multiple sclerosis. This article focuses on the relationship between these imaging techniques and the biologic and chemical pathways leading to multiple sclerosis pathology and its clinical features...
May 2017: Neuroimaging Clinics of North America
https://www.readbyqxmd.com/read/28390538/hybrid-pet-mr-state-of-the-art-and-future-challenges
#18
EDITORIAL
Weili Lin, Sheng-Che Hung, Yueh Z Lee, Terence Z Wong
No abstract text is available yet for this article.
May 2017: Magnetic Resonance Imaging Clinics of North America
https://www.readbyqxmd.com/read/28390536/integration-of-pet-mr-hybrid-imaging-into-radiation-therapy-treatment
#19
REVIEW
Tong Zhu, Shiva Das, Terence Z Wong
Hybrid PET/MR imaging is in early development for treatment planning. This article briefly reviews research and clinical applications of PET/MR imaging in radiation oncology. With improvements in workflow, more specific tracers, and fast and robust acquisition protocols, PET/MR imaging will play an increasingly important role in better target delineation for treatment planning and have clear advantages in the evaluation of tumor response and in a better understanding of tumor heterogeneity. With advances in treatment delivery and the potential of integrating PET/MR imaging with research on radiomics for radiation oncology, quantitative and physiologic information could lead to more precise and personalized RT...
May 2017: Magnetic Resonance Imaging Clinics of North America
https://www.readbyqxmd.com/read/28390535/pediatric-applications-of-hybrid-pet-mr-imaging
#20
REVIEW
Yueh Z Lee, Jorge D Oldan, Lynn A Fordham
Hybrid PET/MR imaging systems have recently become available for clinical practice. The simultaneous physiologic and anatomic imaging offers the potential to reduce radiation dose and other advantages for pediatric patients. Issues more unique to pediatric imaging, however, must also be addressed, including imaging time and disease sensitivity. Combined with newer tracers and a concerted multidisciplinary effort, the approach has the potential to substantially improve the imaging of a variety of pediatric diseases...
May 2017: Magnetic Resonance Imaging Clinics of North America
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