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https://www.readbyqxmd.com/read/28225831/whole-body-staging-of-female-patients-with-recurrent-pelvic-malignancies-ultra-fast-18f-fdg-pet-mri-compared-to-18f-fdg-pet-ct-and-ct
#1
Julian Kirchner, Lino Morris Sawicki, Saravanabavaan Suntharalingam, Johannes Grueneisen, Verena Ruhlmann, Bahriye Aktas, Cornelius Deuschl, Ken Herrmann, Gerald Antoch, Michael Forsting, Lale Umutlu
OBJECTIVES: To evaluate the diagnostic feasibility of an ultra-fast 18F-FDG PET/MRI protocol, including T2-w and contrast-enhanced T1-w imaging as well as metabolic assessment (PET) in comparison to 18F-FDG PET/CT and CT for whole-body staging of female patients with suspected recurrence of pelvic malignancies. METHODS: 43 female patients with suspected tumor recurrence were included in this study. Suspicion was based on clinical follow-up and abnormal findings on imaging follow-up...
2017: PloS One
https://www.readbyqxmd.com/read/28199138/pediatric-neuroendocrine-carcinoid-tumors-review-of-diagnostic-imaging-findings-and-recent-advances
#2
Andrew J Degnan, Sameh S Tadros, Shannon Tocchio
OBJECTIVE: Although rare, pediatric neuroendocrine tumors including carcinoid tumor have increased in incidence over the past few decades. Despite increased recognition, survival rates have not significantly improved. Earlier detection of these tumors is necessary to improve clinical outcomes. This article discusses imaging approaches for detecting pediatric carcinoid tumors including anatomic imaging methods such as CT and MRI as well as functional imaging methods targeting the somatostatin receptor including (111)In-labeled octreotide and newer (68)Ga-based radiotracers that may hold promise in hybrid PET/CT or PET/MRI...
February 15, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28197685/test-retest-measurements-of-dopamine-d1-type-receptors-using-simultaneous-pet-mri-imaging
#3
Simon Kaller, Michael Rullmann, Marianne Patt, Georg-Alexander Becker, Julia Luthardt, Johanna Girbardt, Philipp M Meyer, Peter Werner, Henryk Barthel, Anke Bresch, Thomas H Fritz, Swen Hesse, Osama Sabri
PURPOSE: The role of dopamine D1-type receptor (D1R)-expressing neurons in the regulation of motivated behavior and reward prediction has not yet been fully established. As a prerequisite for future research assessing D1-mediated neuronal network regulation using simultaneous PET/MRI and D1R-selective [(11)C]SCH23390, this study investigated the stability of central D1R measurements between two independent PET/MRI sessions under baseline conditions. METHODS: Thirteen healthy volunteers (7 female, age 33 ± 13 yrs) underwent 90-min emission scans, each after 90-s bolus injection of 486 ± 16 MBq [(11)C]SCH23390, on two separate days within 2-4 weeks using a PET/MRI system...
February 14, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28183987/in-vivo-hypoxia-pet-imaging-quantifies-the-severity-of-arthritic-joint-inflammation-in-line-with-overexpression-of-hif-and-enhanced-ros-generation
#4
Kerstin Fuchs, Anna Kuehn, Moritz Mahling, Philipp Guenthoer, Andreas Hector, Dominik Hartl, Stefan Laufer, Ursula Kohlhofer, Leticia Quintanilla-Martinez, Gerald Reischl, Martin Röcken, Bernd J Pichler, Manfred Kneilling
Hypoxia is essential for the development of autoimmune diseases such as rheumatoid arthritis (RA) and is associated with the expression of reactive oxygen species (ROS), due to enhanced infiltration of immune cells. The aim of this study was to demonstrate the feasibility of measuring hypoxia non-invasively in vivo in arthritic ankles with positron emission tomography (PET)/magnetic resonance imaging (MRI) using the hypoxia tracers (18)F-fluoromisonidazole (FMISO) and (18)F-fluoroazomycinarabinoside (FAZA)...
February 9, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28180966/an-update-on-the-role-of-pet-ct-and-pet-mri-in-ovarian-cancer
#5
REVIEW
Benjapa Khiewvan, Drew A Torigian, Sahra Emamzadehfard, Koosha Paydary, Ali Salavati, Sina Houshmand, Thomas J Werner, Abass Alavi
This review article summarizes the role of PET/CT and PET/MRI in ovarian cancer. With regard to the diagnosis of ovarian cancer, the presence of FDG uptake within the ovary of a postmenopausal woman raises the concern for ovarian cancer. Multiple studies show that FDG PET/CT can detect lymph node and distant metastasis in ovarian cancer with high accuracy and may, therefore, alter the management to obtain better clinical outcomes. Although PET/CT staging is superior for N and M staging of ovarian cancer, its role is limited for T staging...
February 8, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28172890/p176-correlation-of-biomarkers-to-pet-mri-and-endoscopy-in-patients-with-crohn-s-disease-with-special-focus-on-small-bowel-involvement
#6
J Langhorst, J Boone, A Koch, A Rueffer, G Dobos, K Beiderwellen, T Lauenstein
No abstract text is available yet for this article.
February 1, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28168589/impact-of-pet-acquisition-durations-on-image-quality-and-lesion-detectability-in-whole-body-68-ga-psma-pet-mri
#7
Benjamin Noto, Florian Büther, Katharina Auf der Springe, Nemanja Avramovic, Walter Heindel, Michael Schäfers, Thomas Allkemper, Lars Stegger
BACKGROUND: While (68)Ga-PSMA PET-MRI might be superior to PET-CT with regard to soft tissue assessment in prostate cancer evaluation, it is also known to potentially introduce additional PET image artefacts. Therefore, the impact of PET acquisition duration and attenuation data on artefact occurrence, lesion detectability, and quantification was investigated. To this end, whole-body PET list mode data from 12 patients with prostate cancer were acquired 1 h after injection of 2 MBq/kg [(68)Ga]HBED-CC-PSMA on a hybrid PET-MRI system...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28168166/evaluation-of-pet-mri-for-tumor-volume-delineation-for-head-and-neck-cancer
#8
Kyle Wang, Brandon T Mullins, Aaron D Falchook, Jun Lian, Kelei He, Dinggang Shen, Michael Dance, Weili Lin, Tiffany M Sills, Shiva K Das, Benjamin Y Huang, Bhishamjit S Chera
INTRODUCTION: Computed tomography (CT), combined positron emitted tomography and CT (PET/CT), and magnetic resonance imaging (MRI) are commonly used in head and neck radiation planning. Hybrid PET/MRI has garnered attention for potential added value in cancer staging and treatment planning. Herein, we compare PET/MRI vs. planning CT for head and neck cancer gross tumor volume (GTV) delineation. MATERIAL AND METHODS: We prospectively enrolled patients with head and neck cancer treated with definitive chemoradiation to 60-70 Gy using IMRT...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28161723/-18-f-fdg-pet-mri-in-patients-suffering-from-lymphoma-how-much-mri-information-is-really-needed
#9
Julian Kirchner, Cornelius Deuschl, Johannes Grueneisen, Ken Herrmann, Michael Forsting, Philipp Heusch, Gerald Antoch, Lale Umutlu
OBJECTIVES: To evaluate and compare the diagnostic potential of different reading protocols, entailing non-enhanced/contrast-enhanced and diffusion-weighted (18)F-FDG PET/MR imaging for lesion detection and determination of the tumor stage in lymphoma patients. METHODS: A total of 101 (18)F-FDG PET/MRI datasets including a (1) transverse T2-w HASTE and (18)F-FDG PET (PET/MRI1), (2) with an additional contrast enhanced VIBE (PET/MRI2), and (3) with additional diffusion-weighted imaging (PET/MRI3) were evaluated...
February 4, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28161722/andrea-ciarmiello-and-luigi-mansi-eds-pet-ct-and-pet-mri-in-neurology-swot-analysis-applied-to-hybrid-imaging-springer-international-publishing-switzerland-2016-isbn-978-3-319-31612-3
#10
Georges El Fakhri
No abstract text is available yet for this article.
February 4, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28132716/-18-f-fdg-pet-mri-in-lymphoma-patients
#11
Eva Ferdová, Jiří Ferda, Jan Baxa
The introduction of hybrid PET/MRI imaging using integrated systems into clinical practice has opened up the possibility of reducing the radiation dose from hybrid imaging by eliminating the contribution from computed tomography. Studies comparing the possibilities of PET/CT and PET/MRI imaging demonstrated it is possible to use the advantages of the high contrast resolution of magnetic resonance for soft tissue and bone marrow along with PET records in a quality comparable to PET/CT imaging. The significant feature for PET imaging in Hodgkińs lymphoma is that it is a tissue with high levels of radiopharmaceutical accumulation, which decreases proportionally after successful therapeutic effect, the effect of therapy is assessed using Deauville score system on interim examinations...
January 23, 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28131593/pet-mri-in-children
#12
Sergios Gatidis, Benjamin Bender, Matthias Reimold, Jürgen F Schäfer
During the past decade, combined PET/MRI has been translated from a basic technical concept to a clinical research tool and a clinically applied hybrid imaging modality. Numerous clinical and scientific applications have been proposed for this novel hybrid modality including oncologic, neurologic and cardiovascular imaging. Among these, PET/MRI in children has emerged as a key application, not only due to possible diagnostic advantages but also because of reduced radiation exposure compared to alternative techniques...
January 21, 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28130579/-imaging-diagnostics-in-bone-metastases
#13
L Kintzelé, M-A Weber
Bone metastases are common, can cause a variety of relevant symptoms and are often associated with a poor prognosis. An early and accurate diagnosis is therefore crucial; however, the pattern is very heterogeneous and necessitates good knowledge of the possibilities and limitations of each imaging modality. Magnetic resonance imaging (MRI) and positron emission tomography-computed tomography (PET/CT) have the highest sensitivity and specificity for detecting bone metastases. Gradient echo and diffusion-weighted sequences are valuable supplements to the MRI protocol in doubtful cases and MRI is particularly suitable for distinguishing osteoporotic from metastatic spinal fractures with a high degree of diagnostic certainty; however, CT is the modality of choice for stability assessment...
February 2017: Der Radiologe
https://www.readbyqxmd.com/read/28113455/design-features-and-mutual-compatibility-studies-of-the-time-of-flight-pet-capable-ge-signa-pet-mr-system
#14
Craig S Levin, Sri Harsha Maramraju, Mohammad Mehdi Khalighi, Timothy W Deller, Gaspar Delso, Floris Jansen
A recent entry into the rapidly evolving field of integrated PET/MR scanners is presented in this paper: a whole body hybrid PET/MR system (SIGNA PET/MR, GE Healthcare) capable of simultaneous acquisition of both time-of-flight (TOF) PET and high resolution MR data. The PET ring was integrated into an existing 3T MR system resulting in a (patient) bore opening of 60 cm diameter, with a 25 cm axial FOV. The PET ring is placed between the shielded RF body coil and the gradient coils. The PET detectors are based on silicon photomultipliers coupled to lutetium based scintillators...
March 9, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28112821/a-pilot-study-on-the-correlation-between-fat-fraction-values-and-glucose-uptake-values-in-supraclavicular-fat-by-simultaneous-pet-mri
#15
Andrew McCallister, Le Zhang, Alex Burant, Laurence Katz, Rosa Tamara Branca
PURPOSE: To assess the spatial correlation between MRI and 18F-fludeoxyglucose positron emission tomography (FDG-PET) maps of human brown adipose tissue (BAT) and to measure differences in fat fraction (FF) between glucose avid and non-avid regions of the supraclavicular fat depot using a hybrid FDG-PET/MR scanner. METHODS: In 16 healthy volunteers, mean age of 30 and body mass index of 26, FF, R2*, and FDG uptake maps were acquired simultaneously using a hybrid PET/MR system while employing an individualized cooling protocol to maximally stimulate BAT...
January 23, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28112410/hybrid-zte-dixon-mr-based-attenuation-correction-for-quantitative-uptake-estimation-of-pelvic-lesions-in-pet-mri
#16
Andrew P Leynes, Jaewon Yang, Dattesh D Shanbhag, Sandeep S Kaushik, Youngho Seo, Thomas A Hope, Florian Wiesinger, Peder E Z Larson
PURPOSE: This study introduces a new hybrid ZTE/Dixon MR-based attenuation correction (MRAC) method including bone density estimation for PET/MRI and quantifies the effects of bone attenuation on metastatic lesions uptake in the pelvis. METHODS: Six patients with pelvic lesions were scanned using fluorodeoxyglucose (18F-FDG) in an integrated time-of-flight (TOF) PET/MRI system. For PET attenuation correction, MR imaging consisted of two-point Dixon and zero echo-time (ZTE) pulse sequences...
January 23, 2017: Medical Physics
https://www.readbyqxmd.com/read/28110202/choline-based-imaging-of-prostate-cancer-with-combined-18-f-fluorocholine-pet-and-1-h-mr-spectroscopy-by-means-of-integrated-pet-mri
#17
Axel Wetter, Johannes Grüneisen, Klaus Fliessbach, Susanne Lütje, Benedikt Schaarschmidt, Lale Umutlu
PURPOSE: To evaluate integrated PET/MRI/(1)H MR spectroscopy in patients with prostate cancer. SUBJECTS AND METHODS: Data analysis comprised calculations of correlations of standardized uptake values (SUVs) and ratios of (choline+creatine)/citrate as well as of single metabolite values and a logistic regression analysis of PET data and MR spectroscopy data in 22 patients. RESULTS: SUVmean and integral values of choline correlated significantly in tumors...
January 7, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/28103230/conspicuity-of-malignant-lesions-on-pet-ct-and-simultaneous-time-of-flight-pet-mri
#18
Ryogo Minamimoto, Andrei Iagaru, Mehran Jamali, Dawn Holley, Amir Barkhodari, Shreyas Vasanawala, Greg Zaharchuk
PURPOSE: To compare the conspicuity of malignant lesions between FDG PET/CT and a new simultaneous, time-of-flight (TOF) enabled PET/MRI scanner. METHODS: All patients underwent a single-injection of FDG, followed by a dual imaging protocol consisting of PET/CT followed by TOF PET/MRI. PET/CT and PET/MRI images were evaluated by two readers independently for areas of FDG uptake compatible with malignancy, and then categorized into 5 groups (1: PET/MRI and PET/CT positive; 2: PET/MRI positive, PET/CT positive in retrospect; 3: PET/CT positive, PET/MRI positive in retrospect; 4: PET/MRI positive, PET/CT negative; 5: PET/MRI negative, PET/CT positive) by consensus...
2017: PloS One
https://www.readbyqxmd.com/read/28102031/dual-nano-sized-contrast-agents-in-pet-mri-a-systematic-review
#19
REVIEW
Afsaneh Lahooti, Saeed Sarkar, Sophie Laurent, Saeed Shanehsazzadeh
Nowadays molecular imaging plays a vital role in achieving a successful targeted and personalized treatment. Hence, the approach of combining two or more medical imaging modalities was developed. The objective of this review is to systematically compare recent dual contrast agents in Positron Emission Tomography (PET)/Magnetic Resonance Imaging (MRI) and in some cases Single photon emission computed tomography (SPECT)/MRI in terms of some their characteristics, such as tumor uptake, and reticuloendothelial system uptake (especially liver) and their relaxivity rates for early detection of primary cancer tumor...
November 2016: Contrast Media & Molecular Imaging
https://www.readbyqxmd.com/read/28099995/technical-note-fast-respiratory-motion-estimation-using-sorted-singles-without-unlist-processing-a-feasibility-study
#20
Jaewon Yang, Mehdi Khalighi, Thomas A Hope, Karen Ordovas, Youngho Seo
PURPOSE: The study aims to demonstrate the feasibility of fast respiratory motion estimation using singles data available as a sorted format in list-mode files acquired in an integrated PET/MRI system for a proof-of-concept. METHODS: The derivation of SDRM is enabled by singles recorded and binned by second for each detector crystal in PET list-mode data acquired in a SIGNA PET/MR. The proposed method is to derive a SDRM trace by summing up all singles from all detectors through the PET data acquisition...
January 18, 2017: Medical Physics
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