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https://www.readbyqxmd.com/read/28936429/clinical-pet-mri-in-neurooncology-opportunities-and-challenges-from-a-single-institution-perspective
#1
REVIEW
Lisbeth Marner, Otto M Henriksen, Michael Lundemann, Vibeke Andrée Larsen, Ian Law
PURPOSE: Magnetic resonance imaging (MRI) plays a key role in neurooncology, i.e., for diagnosis, treatment evaluation and detection of recurrence. However, standard MRI cannot always separate malignant tissue from other pathologies or treatment-induced changes. Advanced MRI techniques such as diffusion-weighted imaging, perfusion imaging and spectroscopy show promising results in discriminating malignant from benign lesions. Further, supplemental imaging with amino acid positron emission tomography (PET) has been shown to increase accuracy significantly and is used routinely at an increasing number of sites...
2017: Clinical and Translational Imaging: Reviews in Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28935243/fdg-pet-mr-imaging-in-alveolar-echinococcosis
#2
Felix Lötsch, Fredrik Waneck, Herbert Auer, Klaus Kaczirek, Georgios Karanikas, Michael Ramharter
No abstract text is available yet for this article.
September 18, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28932900/-68ga-pentixafor-pet-mri-for-the-detection-of-chemokine-receptor-4-expression-in-atherosclerotic-plaques
#3
Xiang Li, Daniel Heber, Tatjana Leike, Dietrich Beitzke, Xia Lu, Xiaoli Zhang, Yongxiang Wei, Markus Mitterhauser, Wolfgang Wadsak, Saskia Kropf, Hans J Wester, Christian Loewe, Marcus Hacker, Alexander R Haug
PURPOSE: The expression of chemokine receptor type 4 (CXCR4) was found co-localized with macrophages on the atherosclerotic vessel wall and participated in the initial emigration of leukocytes. Gallium-68 [(68)Ga]Pentixafor has recently been introduced for the imaging of atherosclerosis by targeting CXCR4. We sought to evaluate human atherosclerotic lesions using [(68)Ga]Pentixafor PET/MRI. METHODS: Thirty-eight oncology patients underwent [(68)Ga]Pentixafor PET/MR imaging at baseline...
September 21, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28925823/deep-learning-mr-imaging-based-attenuation-correction-for-pet-mr-imaging
#4
Fang Liu, Hyungseok Jang, Richard Kijowski, Tyler Bradshaw, Alan B McMillan
Purpose To develop and evaluate the feasibility of deep learning approaches for magnetic resonance (MR) imaging-based attenuation correction (AC) (termed deep MRAC) in brain positron emission tomography (PET)/MR imaging. Materials and Methods A PET/MR imaging AC pipeline was built by using a deep learning approach to generate pseudo computed tomographic (CT) scans from MR images. A deep convolutional auto-encoder network was trained to identify air, bone, and soft tissue in volumetric head MR images coregistered to CT data for training...
September 19, 2017: Radiology
https://www.readbyqxmd.com/read/28921170/comparison-of-novel-multi-level-otsu-mo-pet-and-conventional-pet-segmentation-methods-for-measuring-fdg-metabolic-tumor-volume-in-patients-with-soft-tissue-sarcoma
#5
Inki Lee, Hyung-Jun Im, Meiyappan Solaiyappan, Steve Y Cho
BACKGROUND: We have previously developed a novel and highly consistent PET segmentation algorithm using a multi-level Otsu method (MO-PET). The aim of this study was to evaluate the reliability of MO-PET compared to conventional PET segmentation methods for measuring (18)F-FDG (FDG) PET metabolic tumor volume (MTV) in patients with soft tissue sarcoma (STS). Clinical and imaging data were obtained from the Cancer Imaging Archive. Forty-eight STS patients with FDG PET/CT and MR prior to therapy were analyzed...
September 18, 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28918316/mr-guided-joint-reconstruction-of-activity-and-attenuation-in-brain-pet-mr
#6
Abolfazl Mehranian, Habib Zaidi, Andrew J Reader
With the advent of time-of-flight (TOF) PET scanners, joint maximum-likelihood reconstruction of activity and attenuation (MLAA) maps has recently regained attention for the estimation of PET attenuation maps from emission data. However, the estimated attenuation and activity maps are scaled by unknown scaling factors. We recently demonstrated that in hybrid PET-MR, the scaling issue of this algorithm can be effectively addressed by imposing MR spatial constraints on the estimation of attenuation maps using a penalized MLAA (P-MLAA(+)) algorithm...
September 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28914600/reduction-of-18-f-fdg-dose-in-clinical-pet-mr-imaging-by-using-silicon-photomultiplier-detectors
#7
Tetsuro Sekine, Gaspar Delso, Konstantinos G Zeimpekis, Felipe de Galiza Barbosa, Edwin E G W Ter Voert, Martin Huellner, Patrick Veit-Haibach
Purpose To determine the level of clinically acceptable reduction in injected fluorine 18 ((18)F) fluorodeoxyglucose (FDG) dose in time-of-flight (TOF)-positron emission tomography(PET)/magnetic resonance (MR) imaging by using silicon photomultiplier (SiPM) detectors compared with TOF-PET/computed tomography (CT) using Lu1.8Y0.2SiO5(Ce), or LYSO, detectors in patients with different body mass indexes (BMIs). Materials and Methods Patients were enrolled in this study as part of a larger prospective study with a different purpose than evaluated in this study (NCT02316431)...
September 14, 2017: Radiology
https://www.readbyqxmd.com/read/28912148/thermal-imaging-is-a-non-invasive-alternative-to-pet-ct-for-measurement-of-brown-adipose-tissue-activity-in-humans
#8
James Matthew Law, David Edward Morris, Chioma Izzi Engbeaya, Victoria Salem, Christopher Coello, Lindsay Robinson, Maduka Jayasinghe, Rebecca Scott, Roger Gunn, Eugenii Rabiner, Tricia Tan, Waljit Dhillo, Stephen Bloom, Helen Budge, Michael Symonds
Background: Obesity and its metabolic consequences are a major cause of morbidity and mortality. Brown adipose tissue (BAT) utilises glucose and free fatty acids to produce heat, thereby increasing energy expenditure. Effective evaluation of human BAT stimulators is constrained by current standard BAT assessment methods as positron emission tomography-computed tomography (PET-CT) requires exposure to high doses of ionising radiation. Infrared thermography (IRT) is a potential non-invasive, safe alternative, although direct corroboration with PET-CT has not previously been established...
September 14, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28912147/performance-of-a-pet-insert-for-high-resolution-small-animal-pet-mr-imaging-at-7t
#9
Greg Stortz, Jonathan D Thiessen, Daryl Bishop, Muhammad S Khan, Piotr Kozlowski, Fabrice Retière, Graham Schellenberg, Ehsan Shams, Xuezhu Zhang, Christopher J Thompson, Andrew Goertzen, Vesna Sossi
We present the characterization of a compact magnetic resonance (MR) compatible positron emission tomography (PET) insert for simultaneous pre-clinical PET/MR imaging. While specifically designed with the strict size constraint to fit inside the 114 mm inner diameter of the BGA-12S gradient coil used in the Bruker 70/20 and 94/20 series of small animal MR imaging (MRI) systems, the insert can be easily installed in any appropriate MRI scanner or used as a stand-alone PET system. Methods: The insert is made from a ring of 16 detector-blocks each made from depth-of-interaction capable dual-layer-offset arrays of cerium-doped lutetium-yttrium oxyorthosilicate crystals read out by silicon photomultiplier (SiPM) arrays...
September 14, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28910997/paediatric-nuclear-medicine-imaging
#10
Lorenzo Biassoni, Marina Easty
Background: Nuclear medicine imaging explores tissue viability and function by using radiotracers that are taken up at cellular level with different mechanism. This imaging technique can also be used to assess blood flow and transit through tubular organs. Nuclear medicine imaging has been used in paediatrics for decades and this field is continuously evolving. Sources of data: The data presented comes from clinical experience and some milestone papers on the subject...
September 1, 2017: British Medical Bulletin
https://www.readbyqxmd.com/read/28905393/pet-motion-correction-in-context-of-integrated-pet-mr-current-techniques-limitations-and-future-projections
#11
REVIEW
Ashley Gillman, Stephen Rose, Jye Smith, Paul Thomas, Nicholas Dowson
Patient motion is an important consideration in modern PET image reconstruction. Advances in PET technology mean motion has an increasingly important influence on resulting image quality. Motion-induced artefacts can have adverse effect on clinical outcomes, including missed diagnoses and oversized radiotherapy treatment volumes. This review aims to summarise the wide variety of motion correction techniques available in PET and combined PET/CT and PET/MR, with a focus on the latter. A general framework for the motion correction of PET images is presented, consisting of acquisition, modelling and correction stages...
September 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/28903440/evaluation-of-pituitary-uptake-incidentally-identified-on-18-f-fdg-pet-ct-scan
#12
Huijun Ju, Jinxin Zhou, Yu Pan, Jing Lv, Yifan Zhang
The clinical significance of pituitary uptake on routine whole body (18)F-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...
August 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28902890/simultaneous-trimodal-pet-mr-eeg-imaging-do-eeg-caps-generate-artefacts-in-pet-images
#13
Ravichandran Rajkumar, Elena Rota Kops, Jörg Mauler, Lutz Tellmann, Christoph Lerche, Hans Herzog, N Jon Shah, Irene Neuner
Trimodal simultaneous acquisition of positron emission tomography (PET), magnetic resonance imaging (MRI), and electroencephalography (EEG) has become feasible due to the development of hybrid PET-MR scanners. To capture the temporal dynamics of neuronal activation on a millisecond-by-millisecond basis, an EEG system is appended to the quantitative high resolution PET-MR imaging modality already established in our institute. One of the major difficulties associated with the development of simultaneous trimodal acquisition is that the components traditionally used in each modality can cause interferences in its counterpart...
2017: PloS One
https://www.readbyqxmd.com/read/28890087/-therapeutic-innovations-in-radiation-oncology-for-localized-prostate-cancer
#14
G Créhange, L Cormier
Intensity-modulated radiation therapy, image-guided radiation therapy with fiducial markers and prostate brachytherapy allow the delivery of dose escalation for localized prostate cancer with very low rates of long-term toxicity and sequelae. Nowadays, modern radiotherapy techniques make it possible to shorten treatment time with hypofractionation, to better protect surrounding healthy tissues and to escalate the dose even further. Advances in radiotherapy are closely linked to advances in magnetic resonance imaging (MRI) and/or PET imaging...
September 7, 2017: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
https://www.readbyqxmd.com/read/28885539/a-comparison-of-18f-fdg-pet-mr-with-pet-ct-in-pulmonary-tuberculosis
#15
Benjamin A Thomas, James S Molton, Francesca Leek, Yan Pang, John J Totman, Nicholas I Paton, David W Townsend
PURPOSE: PET/computed tomography (CT) has been shown to detect lesions in patients with pulmonary tuberculosis (PTB) and may be useful for assessing PTB disease in clinical research studies. However, radiation dose is of concern for clinical research in individuals with an underlying curable disease. This study aimed to determine whether PET/MR is equivalent to PET/CT in PTB. MATERIALS AND METHODS: Ten patients with microbiologically confirmed PTB were recruited...
September 6, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28882867/diagnostic-accuracy-of-neuroimaging-to-delineate-diffuse-gliomas-within-the-brain-a-meta-analysis
#16
N Verburg, F W A Hoefnagels, F Barkhof, R Boellaard, S Goldman, J Guo, J J Heimans, O S Hoekstra, R Jain, M Kinoshita, P J W Pouwels, S J Price, J C Reijneveld, A Stadlbauer, W P Vandertop, P Wesseling, A H Zwinderman, P C De Witt Hamer
BACKGROUND: Brain imaging in diffuse glioma is used for diagnosis, treatment planning, and follow-up. PURPOSE: In this meta-analysis, we address the diagnostic accuracy of imaging to delineate diffuse glioma. DATA SOURCES: We systematically searched studies of adults with diffuse gliomas and correlation of imaging with histopathology. STUDY SELECTION: Study inclusion was based on quality criteria. Individual patient data were used, if available...
September 7, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28881235/mri-compatibility-study-of-an-integrated-pet-rf-coil-prototype-system-at-3t
#17
Md Shahadat Hossain Akram, Takayuki Obata, Mikio Suga, Fumihiko Nishikido, Eiji Yoshida, Kazuyuki Saito, Taiga Yamaya
We have been working on the development of a PET insert for existing magnetic resonance imaging (MRI) systems for simultaneous PET/MR imaging, which integrates radiofrequency (RF)-shielded PET detector modules with an RF head coil. In order to avoid interferences between the PET detector circuits and the different MRI-generated electromagnetic fields, PET detector circuits were installed inside eight Cu-shielded fiber-reinforced plastic boxes, and these eight shielded PET modules were integrated in between the eight elements of a 270-mm-diameter and 280-mm-axial-length cylindrical birdcage RF coil, which was designed to be used with a 3-T clinical MRI system...
August 31, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28879406/whole-tumor-histogram-analysis-of-the-cerebral-blood-volume-map-tumor-volume-defined-by-11c-methionine-positron-emission-tomography-image-improves-the-diagnostic-accuracy-of-cerebral-glioma-grading
#18
Rongli Wu, Yoshiyuki Watanabe, Atsuko Arisawa, Hiroto Takahashi, Hisashi Tanaka, Yasunori Fujimoto, Tadashi Watabe, Kayako Isohashi, Jun Hatazawa, Noriyuki Tomiyama
PURPOSE: This study aimed to compare the tumor volume definition using conventional magnetic resonance (MR) and 11C-methionine positron emission tomography (MET/PET) images in the differentiation of the pre-operative glioma grade by using whole-tumor histogram analysis of normalized cerebral blood volume (nCBV) maps. MATERIALS AND METHODS: Thirty-four patients with histopathologically proven primary brain low-grade gliomas (n = 15) and high-grade gliomas (n = 19) underwent pre-operative or pre-biopsy MET/PET, fluid-attenuated inversion recovery, dynamic susceptibility contrast perfusion-weighted magnetic resonance imaging, and contrast-enhanced T1-weighted at 3...
September 6, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28878847/potential-clinical-applications-of-18-f-fluorodeoxyglucose-positron-emission-tomography-magnetic-resonance-mammography-in-breast-cancer
#19
REVIEW
Ihn-Ho Cho, Eun-Jung Kong
The whole-body positron emission tomography (PET)/magnetic resonance (MR) scan is a cutting edge technology providing comprehensive structural information from MR imaging and functional features from PET in a single session. Recent research findings and clinical experience have shown that (18)F-fluorodeoxyglucose (FDG) whole-body PET/MR imaging has a diagnostic performance comparable with or superior to that of PET/CT in the field of oncology, including for breast cancer. In particular, FDG PET/MR mammography in the prone position with the breast hanging in a pendant manner can provide more comprehensive information about the metabolism, anatomy, and functional features of a breast lesion than a whole-body PET/MR scan...
September 2017: Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28878728/patient-affected-by-beta-propeller-protein-associated-neurodegeneration-a-therapeutic-attempt-with-iron-chelation-therapy
#20
Mattia Fonderico, Michele Laudisi, Nico Golfrè Andreasi, Stefania Bigoni, Costanza Lamperti, Celeste Panteghini, Barbara Garavaglia, Miryam Carecchio, Elia Antonio Emanuele, Gian L Forni, Enrico Granieri
Here, we report the case of a 36-year-old patient with a diagnosis of de novo mutation of the WDR45 gene, responsible for beta-propeller protein-associated neurodegeneration, a phenotypically distinct, X-linked dominant form of Neurodegeneration with Brain Iron Accumulation. The clinical history is characterized by a relatively stable intellectual disability and a hypo-bradykinetic and hypertonic syndrome with juvenile onset. Genetic investigations and T1 and T2-weighted MR images align with what is described in literature...
2017: Frontiers in Neurology
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