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https://www.readbyqxmd.com/read/28097211/new-generation-small-animal-positron-emission-tomography-system-for-molecular-imaging
#1
Shiva Abbaszadeh, Craig S Levin
The next generation of discoveries in molecular imaging requires positron emission tomography (PET) systems with high spatial resolution and high sensitivity to visualize and quantify low concentrations of molecular probes. The goal of this work is to assemble and explore such a system. We use cadmium zinc telluride (CZT) to achieve high spatial resolution, three-dimensional interaction positioning, and excellent energy resolution. The CZT crystals are arranged in an edge-on configuration with a minimum gap of [Formula: see text] in a four-sided panel geometry to achieve superior photon sensitivity...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28048528/we-h-206-01-photoacoustic-tomography-multiscale-imaging-from-organelles-to-patients-by-ultrasonically-beating-the-optical-diffusion-limit
#2
L Wang
: Lihong V. Wang: Photoacoustic tomography (PAT), combining non-ionizing optical and ultrasonic waves via the photoacoustic effect, provides in vivo multiscale functional, metabolic, and molecular imaging. Broad applications include imaging of the breast, brain, skin, esophagus, colon, vascular system, and lymphatic system in humans or animals. Light offers rich contrast but does not penetrate biological tissue in straight paths as x-rays do. Consequently, high-resolution pure optical imaging (e...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048410/su-f-t-682-in-vivo-simulation-of-the-relative-biological-effectiveness-in-proton-therapy-using-a-monte-carlo-method
#3
H Oesten, S Loeck, S Helmbrecht, F Tillner, P Wohlfahrt, J Schuemann, A Luehr
PURPOSE: In proton therapy, the relative biological effectiveness (RBE) - compared with conventional photon therapy - is routinely set to 1.1. However, experimental in vitro studies indicate evidence for the variability of the RBE. To clarify the impact on patient treatment, investigation of the RBE in a preclinical case study should be performed. METHODS: The Monte Carlo software TOPAS was used to simulate the radiation field of an irradiation setup at the experimental beamline of the proton therapy facility (OncoRay) in Dresden, Germany...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047869/we-h-206-02-recent-advances-in-multi-modality-molecular-imaging-of-small-animals
#4
B Tsui
: Lihong V. Wang: Photoacoustic tomography (PAT), combining non-ionizing optical and ultrasonic waves via the photoacoustic effect, provides in vivo multiscale functional, metabolic, and molecular imaging. Broad applications include imaging of the breast, brain, skin, esophagus, colon, vascular system, and lymphatic system in humans or animals. Light offers rich contrast but does not penetrate biological tissue in straight paths as x-rays do. Consequently, high-resolution pure optical imaging (e...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047205/we-h-206-03-promises-and-challenges-of-benchtop-x-ray-fluorescence-ct-xfct-for-quantitative-in-vivo-imaging
#5
S Cho
: Lihong V. Wang: Photoacoustic tomography (PAT), combining non-ionizing optical and ultrasonic waves via the photoacoustic effect, provides in vivo multiscale functional, metabolic, and molecular imaging. Broad applications include imaging of the breast, brain, skin, esophagus, colon, vascular system, and lymphatic system in humans or animals. Light offers rich contrast but does not penetrate biological tissue in straight paths as x-rays do. Consequently, high-resolution pure optical imaging (e...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046461/we-h-206-00-advances-in-preclinical-imaging
#6
Patrick La Riviere
: Lihong V. Wang: Photoacoustic tomography (PAT), combining non-ionizing optical and ultrasonic waves via the photoacoustic effect, provides in vivo multiscale functional, metabolic, and molecular imaging. Broad applications include imaging of the breast, brain, skin, esophagus, colon, vascular system, and lymphatic system in humans or animals. Light offers rich contrast but does not penetrate biological tissue in straight paths as x-rays do. Consequently, high-resolution pure optical imaging (e...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27998187/small-animal-image-guided-radiotherapy
#7
Kevin M Prise, Frank Verhaegen
No abstract text is available yet for this article.
January 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/27958376/high-resolution-short-exposure-small-animal-laboratory-x-ray-phase-contrast-tomography
#8
Daniel H Larsson, William Vågberg, Andre Yaroshenko, Ali Önder Yildirim, Hans M Hertz
X-ray computed tomography of small animals and their organs is an essential tool in basic and preclinical biomedical research. In both phase-contrast and absorption tomography high spatial resolution and short exposure times are of key importance. However, the observable spatial resolutions and achievable exposure times are presently limited by system parameters rather than more fundamental constraints like, e.g., dose. Here we demonstrate laboratory tomography with few-ten μm spatial resolution and few-minute exposure time at an acceptable dose for small-animal imaging, both with absorption contrast and phase contrast...
December 13, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27897087/nuclear-imaging-of-thrombosis-in-small-animal
#9
Marie-Cécile Valéra, Bernard Payrastre, Olivier Lairez
Thromboembolic disorders are a major cause of morbidity and mortality worldwide. The progress in noninvasive imaging techniques has led to the development of radionuclide imaging based on SPECT and PET approaches to observe molecular and cellular processes that may underlie the onset and progression of disease. The advantages of using normal and genetically modified small animal research have spurred the development of dedicated small animal imaging systems. Animal models of venous and arterial thrombosis are largely used and have improved our understanding of the etiology and pathogenesis of thrombosis...
November 29, 2016: Platelets
https://www.readbyqxmd.com/read/27842504/epcam-as-multi-tumour-target-for-near-infrared-fluorescence-guided-surgery
#10
P B A A van Driel, M C Boonstra, H A J M Prevoo, M van de Giessen, T J A Snoeks, Q R J G Tummers, S Keereweer, R A Cordfunke, A Fish, J D H van Eendenburg, B P F Lelieveldt, J Dijkstra, C J H van de Velde, P J K Kuppen, A L Vahrmeijer, C W G M Löwik, C F M Sier
BACKGROUND: Evaluation of resection margins during cancer surgery can be challenging, often resulting in incomplete tumour removal. Fluorescence-guided surgery (FGS) aims to aid the surgeon to visualize tumours and resection margins during surgery. FGS relies on a clinically applicable imaging system in combination with a specific tumour-targeting contrast agent. In this study EpCAM (epithelial cell adhesion molecule) is evaluated as target for FGS in combination with the novel Artemis imaging system...
November 14, 2016: BMC Cancer
https://www.readbyqxmd.com/read/27826982/development-of-a-dynamic-phantom-and-investigation-of-mobile-target-imaging-and-irradiation-in-preclinical-small-animal-research
#11
Anne-Marie Frelin-Labalme, Vincent Beaudouin
OBJECTIVE: Progress made in preclinical radiotherapy makes respiratory gating reachable. Nevertheless, technical means are still needed, as well as accurate investigations of the effect of motion on small animal treatment plans. METHODS: An animal-scaled dynamic phantom (0.3-11.1-mm motion peak-to-peak amplitude, 30-120 cycles per minute) was developed and characterized. It was used to evaluate respiratory monitoring and high resolution imaging (μPET/CT scans)...
January 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/27821346/radiolabeling-and-biological-characterization-of-tpgs-based-nanomicelles-by-means-of-small-animal-imaging
#12
Fiorella Carla Tesan, Mariano Gastón Portillo, Marcela Analía Moretton, Ezequiel Bernabeu, Diego Andrés Chiappetta, Maria Jimena Salgueiro, Marcela Beatriz Zubillaga
INTRODUCTION: In recent years, nanomedicines have raised as a powerful tool to improve prevention, diagnosis and treatment of different pathologies. Among the most well investigated biomaterials, D-α-tocopheryl polyethylene glycol succinate (also known as TPGS) has been on the spot for the last decade. We therefore designed a method to biologically characterize TPGS-based nanomicelles by labeling them with (99m)Tc. METHODS: Labeling process was performed by a direct method...
January 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/27809405/pulmonary-perfusion-quantification-with-flow-sensitive-inversion-recovery-fair-ute-mri-in-small-animal-imaging
#13
Marta Tibiletti, Andrea Bianchi, Detlef Stiller, Volker Rasche
Blood perfusion in lung parenchyma is an important property for assessing lung function. In small animals, its quantitation is limited even with radioactive isotopes or dynamic contrast-enhanced MRI techniques. In this study, the feasibility flow-sensitive alternating inversion recovery (FAIR) for the quantification of blood flow in lung parenchyma in free breathing rats at 7 T has been investigated. In order to obtain sufficient signal from the short T2 * lung parenchyma, a 2D ultra-short echo time (UTE) Look-Locker read-out has been implemented...
November 3, 2016: NMR in Biomedicine
https://www.readbyqxmd.com/read/27779702/extract-of-caulis-spatholobi-a-novel-blocker-targeting-tumor-cell%C3%A2-induced-platelet-aggregation-inhibits-breast-cancer-metastasis
#14
Xi Chen, Qi Li, Xiao-Xi Kan, Ya-Jie Wang, Yu-Jie Li, Qing Yang, Hong-Bin Xiao, Ying Chen, Xiao-Gang Weng, Wei-Yan Cai, Xiao-Xin Zhu
Metastasis of breast cancer is the vital step for malignant progression. During such a process, hematogenous metastasis is an indispensable approach for the dissemination of cancer cells. A platelet, contributes to hypercoagulable state, and is also identified the crucial factor in the coagulation system for supporting metastasis. Therefore, the relationship of a platelet and a tumor cell plays a critical role in tumor cell metastasis. Consequently, inhibiting tumor cell‑induced platelet aggregation (TCIPA) is recongnized as a crucial target on suppression of tumor metastasis such as aspirin (ASA)...
December 2016: Oncology Reports
https://www.readbyqxmd.com/read/27738785/guidance-for-efficient-small-animal-imaging-quality-control
#15
Dustin R Osborne, Claudia Kuntner, Stuart Berr, David Stout
Routine quality control is a critical aspect of properly maintaining high-performance small animal imaging instrumentation. A robust quality control program helps produce more reliable data both for academic purposes and as proof of system performance for contract imaging work. For preclinical imaging laboratories, the combination of costs and available resources often limits their ability to produce efficient and effective quality control programs. This work presents a series of simplified quality control procedures that are accessible to a wide range of preclinical imaging laboratories...
October 13, 2016: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/27738632/radiation-guided-peptide-delivery-in-a-mouse-model-of-nasopharyngeal-carcinoma
#16
Pei-Cheng Lin, Jun-Yan He, Yu-Yin Le, Kai-Xin Du, Wei-Feng Zhu, Qing-Qin Peng, Ya-Ping Dong, Jin-Luan Li, Jun-Xin Wu
Purpose. This study aimed to evaluate the characteristics of the HVGGSSV peptide, exploring radiation-guided delivery in a mouse model of nasopharyngeal carcinoma. Methods. Mice with CNE-1 nasopharyngeal carcinoma were assigned to two different groups treated with Cy7-NHS and Cy7-HVGGSSV, respectively. Meanwhile, each mouse received a single dose of 3 Gy radiation. Biological distribution of the recombinant peptide was assessed on an in vivo small animal imaging system. Results. The experimental group showed maximum fluorescence intensity in irradiated tumors treated with Cy7-labeled HVGGSSV, while untreated (0 Gy) control tumors showed lower intensity levels...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27620742/survival-variability-of-controls-and-definition-of-imaging-endpoints-for-longitudinal-follow-up-of-pancreatic-ductal-adenocarcinoma-in-rats
#17
Cherif Akladios, Mihaela Ignat, Didier Mutter, Marc Aprahamian
BACKGROUND: The 3Rs guideline is the gold standard for ethics in animal experimentation. Two of those rules, namely refinement and reduction, require further improvement. The objective of this study was to define pathways to better compliance with these prerequisites. Two methods which move us in this direction are: (1) using small animal imaging techniques for pancreatic ductal adenocarcinoma (PDAC) follow-up and (2) reduction of the number of control animals included in a study of PDAC progression under treatment...
September 12, 2016: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/27570710/optical-coherence-tomography-angiography-in-mice-comparison-with-confocal-scanning-laser-microscopy-and-fluorescein-angiography
#18
Helena Giannakaki-Zimmermann, Despina Kokona, Sebastian Wolf, Andreas Ebneter, Martin S Zinkernagel
PURPOSE: Optical coherence tomography angiography (OCT-A) allows noninvasive visualization of retinal vessels in vivo. OCT-A was used to characterize the vascular network of the mouse retina and was compared with fluorescein angiography (FA) and histology. METHODS: In the present study, OCT-A based on a Heidelberg Engineering Spectralis system was used to investigate the vascular network in mice. Data was compared with FA and confocal microscopy of flat-mount histology stained with isolectin IB4...
August 2016: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/27556813/characterization-of-a-scintillating-fibre-detector-for-small-animal-imaging-and-irradiation-dosimetry
#19
Coralie Le Deroff, Anne-Marie Frelin-Labalme, Xavier Ledoux
OBJECTIVE: Small animal image-guided irradiators have recently been developed to mimic the delivery techniques of clinical radiotherapy. A dosemeter adapted to millimetric beams of medium-energy X-rays is then required. This work presents the characterization of a dosemeter prototype for this particular application. METHODS: A scintillating optical fibre dosemeter (called DosiRat) has been implemented to perform real-time dose measurements with the dedicated small animal X-RAD(®) 225Cx (Precision X-Ray, Inc...
January 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/27463894/differentiation-of-tumor-vasculature-heterogeneity-levels-in-small-animals-based-on-total-hemoglobin-concentration-using-magnetic-resonance-guided-diffuse-optical-tomography-in-vivo
#20
Tiffany C Kwong, Mitchell Hsing, Yuting Lin, David Thayer, Mehmet Burcin Unlu, Min-Ying Su, Gultekin Gulsen
Insight into the vasculature of the tumor in small animals has the potential to impact many areas of cancer research. The heterogeneity of the vasculature of a tumor is directly related to tumor stage and disease progression. In this small scale animal study, we investigated the feasibility of differentiating tumors with different levels of vasculature heterogeneity in vivo using a previously developed hybrid magnetic resonance imaging (MRI) and diffuse optical tomography (DOT) system for small animal imaging...
July 20, 2016: Applied Optics
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