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https://www.readbyqxmd.com/read/28530533/respiratory-motion-management-in-pet-ct-applications-and-clinical-usefulness
#1
Luca Guerra, Elena De Ponti, Sabrina Morzenti, Chiara Spadavecchia, Cinzia Crivellaro
Although breathing movement can introduce heavy bias in both image quality and quantitation, currently there is lack of interest for the respiratory motion management in PET/CT imaging. The respiratory gating technology has shown significant benefits on image quality, reducing motion related artifacts and increasing quantification. Indeed, many papers have demonstrated that there is a consistent increase of the Standardized Uptake Value (SUV) in gated PET images when compared to ungated ones, particularly for the small lesions located both in liver and in lung...
May 19, 2017: Current Radiopharmaceuticals
https://www.readbyqxmd.com/read/28528264/baseline-and-longitudinal-variability-of-normal-tissue-uptake-values-of-18-f-fluorothymidine-pet-images
#2
Matthijs C F Cysouw, Gerbrand M Kramer, Virginie Frings, Adrianus J De Langen, Mariëlle J Wondergem, Laura M Kenny, Eric O Aboagye, Carsten Kobe, Jürgen Wolf, Otto S Hoekstra, Ronald Boellaard
PURPOSE: [(18)F]-fluorothymidine ([(18)F]-FLT) is a PET-tracer enabling in-vivo visualization and quantification of tumor cell proliferation. For qualitative and quantitative analysis, adequate knowledge of normal tissue uptake is indispensable. This study aimed to quantitatively investigate baseline tracer uptake of blood pool, lung, liver and bone marrow and their precision, and to assess the longitudinal effect of systemic treatment on biodistribution. METHODS: (18)F-FLT-PET(/CT) scans (dynamic or static) of 90 treatment-naïve oncological patients were retrospectively evaluated...
May 10, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28528206/feasibility-of-atlas-based-active-bone-marrow-sparing-intensity-modulated-radiation-therapy-for-cervical-cancer
#3
Nan Li, Sonal S Noticewala, Casey W Williamson, Hanjie Shen, Igor Sirak, Rafal Tarnawski, Umesh Mahantshetty, Carl K Hoh, Kevin L Moore, Loren K Mell
BACKGROUND: To test the hypothesis that atlas-based active bone marrow (ABM)-sparing intensity modulated radiation therapy (IMRT) yields similar dosimetric results compared to custom ABM-sparing IMRT for cervical cancer patients. METHODS: We sampled 62 cervical cancer patients with pre-treatment FDG-PET/CT in training (n=32) or test (n=30) sets. ABM was defined as the subvolume of the pelvic bone marrow (PBM) with standardized uptake value (SUV) above the mean on the average FDG-PET image (ABMAtlas) vs...
May 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28522740/initial-experience-with-volumetric-68-ga-psma-i-t-pet-ct-for-assessment-of-whole-body-tumor-burden-as-a-quantitative-imaging-biomarker-in-patients-with-prostate-cancer
#4
Sebastian Schmuck, Christoph A von Klot, Christoph Henkenberens, Jan M Sohns, Hans Christiansen, Hans-Jürgen Wester, Tobias L Ross, Frank M Bengel, Thorsten Derlin
A quantitative imaging biomarker is desirable to provide a comprehensive measure of whole-body tumor burden in patients with metastatic prostate cancer, and to standardize the evaluation of treatment-related changes. Therefore, we evaluated whether prostate specific membrane antigen (PSMA) ligand positron emission tomography/computed tomography (PET/CT) may be applied to provide PSMA-derived volumetric parameters for quantification of whole-body tumor burden. Methods: 101 patients who underwent a (68)Ga-PSMA I&T PET/CT because of increasing prostate specific antigen (PSA) levels after radical prostatectomy were included in this retrospective analysis...
May 18, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28513853/association-between-textural-and-morphological-tumor-indices-on-baseline-pet-ct-and-early-metabolic-response-on-interim-pet-ct-in-bulky-malignant-lymphomas
#5
Fayçal Ben Bouallègue, Yassine Al Tabaa, Marilyne Kafrouni, Guillaume Cartron, Fabien Vauchot, Denis Mariano-Goulart
PURPOSE: We investigated whether metabolic, textural and morphological tumoral indices evaluated on baseline PET-CT were predictive of early metabolic response on interim PET-CT in a cohort of patients with bulky Hodgkin and non-Hodgkin malignant lymphomas. METHODS: This retrospective study included 57 patients referred for initial PET-CT examination. In-house dedicated software was used to delineate tumor contours using a fixed 30% threshold of SUV max and then to compute tumoral metabolic parameters (SUV max, mean, peak, standard deviation, skewness and kurtosis, metabolic tumoral volume (MTV), total lesion glycolysis, and area under the curve of the cumulative histogram), textural parameters (Moran's and Geary's indices, energy, entropy, contrast, correlation derived from the gray-level co-occurrence matrix, area under the curve of the power spectral density, auto-correlation distance, and granularity), and shape parameters (surface, asphericity, convexity, surfacic extension, and 2D and 3D fractal dimensions)...
May 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28511797/deficiency-of-liver-x-receptor-%C3%AE-reduces-glucose-uptake-and-worsens-remodeling-after-myocardial-infarction
#6
Qingqi Ji, Yichao Zhao, Ancai Yuan, Jun Pu, Ben He
Liver X receptor α (LXRα) is an endogenous protective receptor against ischemic heart diseases, and its beneficial effects have been associated with the regulation of lipid metabolism in heart. However, whether LXRα regulated glucose metabolism in ischemic heart diseases has not been investigated. In this study we investigated the involvement of LXRα on glucose metabolism in cardiac remodeling after myocardial infarction (MI). MI was induced in mice by permanent ligation of the left anterior descending coronary artery (LCA)...
May 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28508284/repeatability-of-quantitative-parameters-of-18f-fluoride-pet-ct-and-biochemical-tumour-and-specific-bone-remodelling-markers-in-prostate-cancer-bone-metastases
#7
Cecilia Wassberg, Mark Lubberink, Jens Sörensen, Silvia Johansson
PURPOSE: 18F-fluoride PET/CT exhibits high sensitivity to delineate and measure the extent of bone metastatic disease in patients with prostate cancer. 18F-fluoride PET/CT could potentially replace traditional bone scintigraphy in clinical routine and trials. However, more studies are needed to assess repeatability and biological uptake variation. The aim of this study was to perform test-retest analysis of quantitative PET-derived parameters and blood/serum bone turnover markers at the same time point...
December 2017: EJNMMI Research
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
#8
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/28499658/-radiotherapy-volume-delineation-based-on-18-f-fluorodeoxyglucose-positron-emission-tomography-for-locally-advanced-or-inoperable-oesophageal-cancer
#9
J Encaoua, R Abgral, C Leleu, O El Kabbaj, P Caradec, D Bourhis, O Pradier, U Schick
PURPOSE: To study the impact on radiotherapy planning of an automatically segmented target volume delineation based on ((18)F)-fluorodeoxy-D-glucose (FDG)-hybrid positron emission tomography-computed tomography (PET-CT) compared to a manually delineation based on computed tomography (CT) in oesophageal carcinoma patients. METHODS AND MATERIALS: Fifty-eight patients diagnosed with oesophageal cancer between September 2009 and November 2014 were included. The majority had squamous cell carcinoma (84...
May 9, 2017: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
https://www.readbyqxmd.com/read/28499600/lipid-vesicles-in-pulsed-electric-fields-fundamental-principles-of-the-membrane-response-and-its-biomedical-applications
#10
REVIEW
Dayinta L Perrier, Lea Rems, Pouyan E Boukany
The present review focuses on the effects of pulsed electric fields on lipid vesicles ranging from giant unilamellar vesicles (GUVs) to small unilamellar vesicles (SUVs), from both fundamental and applicative perspectives. Lipid vesicles are the most popular model membrane systems for studying biophysical and biological processes in living cells. Furthermore, as vesicles are made from biocompatible and biodegradable materials, they provide a strategy to create safe and functionalized drug delivery systems in health-care applications...
April 28, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28497349/suv-navigator-enables-rapid-18-f-fdg-pet-ct-image-interpretation-compared-with-2d-roi-and-3d-voi-evaluations
#11
Atsutaka Okizaki, Michihiro Nakayama, Shunta Ishitoya, Kaori Nakajima, Masaaki Yamashina, Tamio Aburano, Koji Takahashi
PURPOSE: Positron emission tomography (PET) and the maximum standardized uptake value (SUVmax) is a useful technique for assessing malignant tumors. Measurements of SUVmax in multiple lesions per patient frequently require many time-consuming procedures. To address this issue, we designed a novel interface named SUV Navigator (SUVnavi), and the purpose of this study was to investigate its utility. MATERIALS AND METHODS: We measured SUVmax in 661 lesions from 100 patients with malignant tumors...
May 11, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28490470/metal-artifact-reduction-of-ct-scans-to-improve-pet-ct
#12
Charlotte S van der Vos, Anne Ij Arens, Jim Hamill, Christian Hofmann, Vladimir Y Panin, Antoi Pw Meeuwis, Eric P Visser, Lioe-Fee de Geus-Oei
In recent years different metal artifact reduction (MAR) methods have been developed for computed tomography (CT). These methods have only recently been introduced for positron emission tomography/computed tomography (PET/CT) even though they could be beneficial for interpretation, segmentation and quantification of the PET/CT images. In this study, phantom and patient scans were analyzed visually and quantitatively to measure the effect on PET images of iterative metal artifact reduction (iMAR) of CT data...
May 10, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28489690/measurement-uncertainty-of-lesion-and-reference-mediastinum-standardized-uptake-value-in-lung-cancer
#13
Eric Laffon, Noel Milpied, Roger Marthan
OBJECTIVE: To assess standardized uptake value (SUV) measurement uncertainty (MU) of lung cancer lesions with uptake greater than mediastinum but less than or equal to the liver and that of the mediastinum blood pool, and to compare lesion SUV with mediastinum SUV by assessing MU of their ratio. PATIENTS AND METHODS: Dynamic PET data involving 10 frames were retrospectively analyzed in 10 patients, yielding maximal SUV of 25 lesions (Lesion-SUVmax), 10 mediastinum SUV, either maximal or mean (Med-SUVmax, Med-SUVmean), 25 Rmax ratios (=Lesion-SUVmax/Med-SUVmax), and 25 Rmean ratios (=Lesion-SUVmax/Med-SUVmean)...
June 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28480541/response-assessment-of-stereotactic-body-radiation-therapy-using-dynamic-contrast-enhanced-integrated-mr-pet-in-non-small-cell-lung-cancer-patients
#14
Yu-Sen Huang, Jenny Ling-Yu Chen, Feng-Ming Hsu, Jei-Yie Huang, Wei-Chun Ko, Yi-Chang Chen, Fu-Shan Jaw, Ruoh-Fang Yen, Yeun-Chung Chang
PURPOSE: To evaluate the response in patients undergoing SBRT using dynamic contrast-enhanced (DCE) integrated magnetic resonance positron emission tomography (MR-PET). Stereotactic body radiation therapy (SBRT) is efficacious as a front-line local treatment for non-small cell lung cancer (NSCLC). MATERIALS AND METHODS: We prospectively enrolled 19 lung tumors in 17 nonmetastatic NSCLC patients who were receiving SBRT as a primary treatment. They underwent DCE-integrated 3T MR-PET before and 6 weeks after SBRT...
May 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28476024/dual-time-point-18f-fdg-pet-ct-imaging-with-multiple-metabolic-parameters-in-the-differential-diagnosis-of-malignancy-suspected-bone-joint-lesions
#15
Chen-Tian Shen, Zhong-Ling Qiu, Zhen-Kui Sun, Wei-Jun Wei, Hong-Jun Song, Xin-Yun Zhang, Quan-Yong Luo
The purpose of this study was to evaluate the diagnostic potential of dual time-point 18F-FDG PET/CT imaging with multiple metabolic parameters in malignancy-suspected bone/joint lesions. Fifty seven consecutive patients were recruited. PET parameters including SUVmax, SUVmean, metabolic tumor volume (MTV), total lesional glycolysis (TLG) and retention indexes (RIs) were obtained. Thirty five malignant and 22 benign lesions were confirmed by pathology. In all, 48 receiver operating characteristic (ROC) curves were derived...
April 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/28475345/mechanical-properties-of-membranes-composed-of-gel-phase-or-fluid-phase-phospholipids-probed-on-liposomes-by-atomic-force-spectroscopy
#16
Oumaima Et-Thakafy, Nicolas Delorme, Cedric Gaillard, Cristelle Mériadec, Franck Artzner, Christelle Lopez, Fanny Guyomarc'h
In many liposome applications, the nanomechanical properties of the membrane envelope are essential to ensure e.g. physical stability, protection or penetration into tissues. Of all factors, the lipid composition and its phase behavior are susceptible to tune the mechanical properties of membranes. To investigate this, small unilamellar vesicles (SUV; diameter <200 nm), referred to as liposomes, were produced using either the unsaturated 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) or the saturated 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) in aqueous buffer at pH 6...
May 5, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28473598/test-retest-variability-of-lesion-suv-and-lesion-sur-in-18-f-fdg-pet-an-analysis-of-data-from-two-prospective-multicenter-trials
#17
Frank Hofheinz, Ivayla Apostolova, Liane Oehme, Jörg Kotzerke, Jörg van den Hoff
Quantitative assessment of radiation- and chemotherapy response with (18)F-FDG (fluorodeoxyglucose) whole body PET has attracted increasing interest in recent years. In most published work the standardized uptake value (SUV) is utilized for this purpose. In the context of therapy response assessment the reliability of lesion SUVs, notably their test-retest stability, thus becomes of crucial importance. However, in a recent study substantial test-retest variability (TRV) of SUVs was demonstrated. The purpose of the present study was to investigate if the tumor-to-blood standard uptake ratio (SUR) can improve test-retest variability of tracer uptake...
May 4, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28469723/pulmonary-actinomycosis-mimicking-lung-cancer-on-positron-emission-tomography
#18
Hayoung Choi, Hyun Lee, Suk Hyeon Jeong, Sang-Won Um, O Jung Kown, Hojoong Kim
Pulmonary actinomycosis frequently mimics lung malignancy on radiologic imaging studies. Positron emission tomography-computed tomography (PET-CT) is a useful diagnostic modality for differentiating lung malignancy from benign diseases. However, few studies evaluated PET-CT findings of pulmonary actinomycosis. Therefore, it is unclear whether PET-CT is helpful to distinguish lung malignancy from benign lung disease when pulmonary actinomycosis is clinically suspected. We investigated PET-CT findings in 11 patients with pathologically confirmed pulmonary actinomycosis...
April 2017: Annals of Thoracic Medicine
https://www.readbyqxmd.com/read/28467339/the-primitive-extratesticular-seminoma-diagnosis-of-a-rare-pathology
#19
Luca Saba
 Background: The Primitive Extratesticular Seminoma is a very rare condition and represents 3% of germ cell tumors; it is an indeterminate origin disease, whose diagnosis is often complicated by a nonspecific and highly variable clinical finding. CASE PRESENTATION: A caucasian 55 years old male, non-smoker, arrived to our centre with cough, severe respiratory distress and dysphagia, in a context of the superior vena cava syndrome. A Computed Tomography was performed, which shows the presence of a mediastinal anterior mass with aorto-pulmonary window and left paracardiac invasion...
April 28, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/28458607/novel-application-of-quantitative-single-photon-emission-computed-tomography-computed-tomography-to-predict-early-response-to-methimazole-in-graves-disease
#20
Hyun Joo Kim, Ji-In Bang, Ji-Young Kim, Jae Hoon Moon, Young So, Won Woo Lee
OBJECTIVE: Since Graves' disease (GD) is resistant to antithyroid drugs (ATDs), an accurate quantitative thyroid function measurement is required for the prediction of early responses to ATD. Quantitative parameters derived from the novel technology, single-photon emission computed tomography/computed tomography (SPECT/CT), were investigated for the prediction of achievement of euthyroidism after methimazole (MMI) treatment in GD. MATERIALS AND METHODS: A total of 36 GD patients (10 males, 26 females; mean age, 45...
May 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
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