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"small animal imaging"

Lili Zhao, Jiehui Jiang, Yuexia Shu, Zhuangzhi Yan, Xin Liu
Cone-beam X-ray luminescence optical tomography (CB-XLOT) plays an important role in in vivo small animal imaging study, which can non-invasively image the three-dimensional (3-D) distribution of x-ray-excitable nanophosphors deeply embedded in imaged object. However, CB-XLOT suffers from a low spatial resolution due to the ill-posed nature of optical reconstruction. To alleviate the ill-posedness of reconstruction and improve the imaging performance of XLOT, in this paper, we propose an iterative weighted L1 minimization method which is achieved by incorporating YALL1 (Your algorithm for L1 norm problems)...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Tiffany C Kwong, Farouk Nouizi, Jaedu Cho, Yuting Lin, Uma Sampathkumaran, Gultekin Gulsen
Previously, we demonstrated that temperature-modulated fluorescence tomography (TM-FT) could provide fluorescence images with high quantitative accuracy and the spatial resolution of focused ultrasound. TM-FT is based on scanning the focused ultrasound across the medium to activate temperature-reversible fluorescent nanoprobes (ThermoDots). This technique can resolve small fluorescent targets located several centimeters deep in turbid media with millimeter resolution. Our past studies with this multimodality technique used agar phantoms, which could not represent the true heterogeneous nature of the acoustic and optical properties of biological tissue...
October 1, 2017: Applied Optics
Anchal Ghai, Dolonchampa Maji, Nicholas Cho, Chantiya Chanswangphuwana, Michael Rettig, John DiPersio, Walter Akers, Farrokh Dehdashti, Samuel Achilefu, Ravi Vij, Monica Shokeen
Multiple myeloma (MM) is a plasma B-cell hematologic cancer that causes significant skeletal morbidity. Despite improvements in survival, heterogeneity in response remains a major challenge in MM. Cluster of differentiation 38 (CD38) is a type II transmembrane glycoprotein over-expressed in myeloma cells and is implicated in MM cell signaling. Daratumumab is US Food and Drug Administration approved high-affinity monoclonal antibody targeting CD38 that is clinically benefiting refractory MM patients. Here, we evaluated [(89)Zr]Zr-DFO-daratumumab positron emission tomography/computed tomography (PET/CT) imaging in MM tumor models...
October 12, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Christine R Lattin, Maxwell A Emerson, Jean-Dominique Gallezot, Tim Mulnix, J Elliott Brown, Richard E Carson
BACKGROUND: One potential barrier to using in vivo imaging in any new animal species is solving the basic problem of how to hold animals safely and securely during scans. NEW METHOD: In this paper, we describe the design, fabrication, use, and positional reproducibility of a 3D-printed plastic device (the Avian Imaging Device, or AID) for imaging the brain of 1 or 2 small songbirds. We designed two different types of head cones to use with this device: one that was not contoured and designed for anesthesia induction, and one contoured to the shape of a house sparrow head, designed to be used with a pre-anesthetized animal...
October 6, 2017: Journal of Neuroscience Methods
Jonathan C DeLong, Takashi Murakami, Paul J Yazaki, Robert M Hoffman, Michael Bouvet
BACKGROUND: The success of a curative surgery for cancer is dependent on the complete removal of all cancer cells. Tumor visualization by the surgeon can be enhanced through fluorescent-antibody targeting. To further develop such technology, we selected humanized anti-carcinoembryonic antigen (CEA) conjugated to a near-infrared dye to target orthotopically-implanted human colon cancer in nude mice. MATERIALS AND METHODS: The HT-29 human colon cancer cell line was grown in culture and subcutaneously injected in mice...
October 2017: Journal of Surgical Research
Zihui Li, Ralph Müller, Davide Ruffoni
Anchorage of orthopedic implants depends on the interfacial bonding between the implant and the host bone as well as on the mass and microstructure of peri-implant bone, with all these factors being continuously regulated by the biological process of bone (re)modeling. In osteoporotic bone implant integration may be jeopardized not only by lower peri-implant bone quality but also by reduced intrinsic regeneration ability. The first aim of this review is to provide a critical overview of the influence of osteoporosis on bone regeneration post-implantation...
October 3, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Julia G Mannheim, Firat Kara, Janine Doorduin, Kerstin Fuchs, Gerald Reischl, Sayuan Liang, Marleen Verhoye, Felix Gremse, Laura Mezzanotte, Marc C Huisman
The benefit of small animal imaging is directly linked to the validity and reliability of the collected data. If the data (regardless of the modality used) are not reproducible and/or reliable, then the outcome of the data is rather questionable. Therefore, standardization of the use of small animal imaging equipment, as well as of animal handling in general, is of paramount importance. In a recent paper, guidance for efficient small animal imaging quality control was offered and discussed, among others, the use of phantoms in setting up a quality control program (Osborne et al...
October 2, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
Hideo Sato-Akaba, Miho C Emoto, Hiroshi Hirata, Hirotada G Fujii
This paper describes the development of a digital console for three-dimensional (3D) continuous wave electron paramagnetic resonance (CW-EPR) imaging of a small animal to improve the signal-to-noise ratio and lower the cost of the EPR imaging system. A RF generation board, an RF acquisition board and a digital signal processing (DSP) & control board were built for the digital EPR detection. Direct sampling of the reflected RF signal from a resonator (approximately 750MHz), which contains the EPR signal, was carried out using a band-pass subsampling method...
September 20, 2017: Journal of Magnetic Resonance
David Tibor Lauber, András Fülöp, Tibor Kovács, Krisztián Szigeti, Domokos Máthé, Attila Szijártó
In recent decades, imaging devices have become indispensable tools in the basic sciences, in preclinical research and in modern drug development. The rapidly evolving high-resolution in vivo imaging technologies provide a unique opportunity for studying biological processes of living organisms in real time on a molecular level. State of the art small-animal imaging modalities provide non-invasive images rich in quantitative anatomical and functional information, which renders longitudinal studies possible allowing precise monitoring of disease progression and response to therapy in models of different diseases...
October 2017: Laboratory Animals
Hua-Jiang Dong, Chong-Zhi Shang, Gang Li, Qing Niu, Yue-Chen Luo, Yue Yang, Hui-Peng Meng, Hui-Juan Yin, Hai-Xia Zhang, Ming-Liang Zhao, Ling Lin
The authors aim to track the distribution of human umbilical cord mesenchymal stem cells (MSCs) in large blood vessel of traumatic brain injury -rats through immunohistochemical method and small animal imaging system. After green fluorescent protein (GFP) gene was transfected into 293T cell, virus was packaged and MSCs were transfected. Mesenchymal stem cells containing GFP were transplanted into brain ventricle of rats when the infection rate reaches 95%. The immunohistochemical and small animal imaging system was used to detect the distribution of MSCs in large blood vessels of rats...
September 2017: Journal of Craniofacial Surgery
Markus Zeilinger, Monika Dumanic, Florian Pichler, Lubos Budinsky, Wolfgang Wadsak, Katharina Pallitsch, Helmut Spreitzer, Rupert Lanzenberger, Marcus Hacker, Markus Mitterhauser, Cécile Philippe
The MCHR1 is involved in the regulation of energy homeostasis and changes of the expression are linked to a variety of associated diseases, such as diabetes and adiposity. The study aimed at the in vitro and in vivo evaluation of [(11)C]SNAP-7941 and [(18)F]FE@SNAP as potential PET-tracers for the MCHR1. Competitive binding studies with non-radioactive derivatives and small-animal PET/CT and MRI brain studies were performed under baseline conditions and tracer displacement with the unlabelled MCHR1 antagonist (±)-SNAP-7941...
August 14, 2017: Scientific Reports
Paul Kumar Upputuri, Vijitha Periyasamy, Sandeep Kumar Kalva, Manojit Pramanik
In vivo small-animal imaging has an important role to play in preclinical studies. Photoacoustic tomography (PAT) is an emerging hybrid imaging modality that shows great potential for both preclinical and clinical applications. Conventional optical parametric oscillator-based PAT (OPO-PAT) systems are bulky and expensive and cannot provide high-speed imaging. Recently, pulsed-laser diodes (PLDs) have been successfully demonstrated as an alternative excitation source for PAT. Pulsed-laser diode PAT (PLD-PAT) has been successfully demonstrated for high-speed imaging on photoacoustic phantoms and biological tissues...
June 21, 2017: Journal of Visualized Experiments: JoVE
Xu Cao, Yuzhu Gong, Yang Li, Shouping Zhu, Xuanxuan Zhang, Yonghua Zhan, Fei Kang, Jing Wang, Jimin Liang
Fluorescence imaging is a widely used in vivo optical imaging technique for preclinical studies, but strong tissue autofluorescence and external excitation light make it suffer from a low signal-to-noise ratio (SNR). Recently, a new optical imaging method using persistent luminescence has become of interest due to its advantage of circumvention of autofluorescence and bleed-through of excitation light during signal acquisition. In this work, we proposed a tomographic imaging method based on persistent luminescence named persistent luminescence tomography (PLT), which can obtain three dimensional distributions of persistent luminescence probes deep inside small animals...
March 1, 2017: Biomedical Optics Express
Zhenrong Fu, Lan Lin, Miao Tian, Jingxuan Wang, Baiwen Zhang, Pingping Chu, Shaowu Li, Muhammad Mohsin Pathan, Yulin Deng, Shuicai Wu
The development of genetically engineered mouse models for neuronal diseases and behavioural disorders have generated a growing need for small animal imaging. High-resolution magnetic resonance microscopy (MRM) provides powerful capabilities for noninvasive studies of mouse brains, while avoiding some limits associated with the histological procedures. Quantitative comparison of structural images is a critical step in brain imaging analysis, which highly relies on the performance of image registration techniques...
June 14, 2017: Journal of Microscopy
Mengmeng Huo, Wenyan Li, Arka Sen Chaudhuri, Yuchao Fan, Xiu Han, Chen Yang, Zhenghong Wu, Xiaole Qi
In this study, we developed bio-stimuli-responsive multi-scale hyaluronic acid (HA) nanoparticles encapsulated with polyamidoamine (PAMAM) dendrimers as the subunits. These HA/PAMAM nanoparticles of large scale (197.10±3.00nm) were stable during systematic circulation then enriched at the tumor sites; however, they were prone to be degraded by the high expressed hyaluronidase (HAase) to release inner PAMAM dendrimers and regained a small scale (5.77±0.25nm) with positive charge. After employing tumor spheroids penetration assay on A549 3D tumor spheroids for 8h, the fluorescein isothiocyanate (FITC) labeled multi-scale HA/PAMAM-FITC nanoparticles could penetrate deeply into these tumor spheroids with the degradation of HAase...
September 1, 2017: Carbohydrate Polymers
Chris Daniel Johnstone, Patricia Lindsay, Edward Graves, Eugene Wong, Jessica Perez, Yannick Poirier, Youssef Ben-Bouchta, Thilakshan Kanesalingam, Haijian Chen, Ashley Rubinstein, Ke Sheng, Magdalena Bazalova-Carter
To recommend imaging protocols and establish tolerance levels for microCT image quality assurance (QA) performed on conformal image-guided small animal irradiators. Method and Materials: A fully automated QA software SAPA (small animal phantom analyzer) for image analysis of the commercial Shelley micro-CT MCTP 610 phantom was developed, in which quantitative analyses of CT number linearity, signal-to-noise ratio (SNR), uniformity and noise, geometric accuracy, spatial resolution by means of modulation transfer function (MTF), and CT contrast were performed...
June 2, 2017: Physics in Medicine and Biology
Samira Abbaspour, Babak Mahmoudian, Jalil Pirayesh Islamian
The detector in single-photon emission computed tomography has played a key role in the quality of the images. Over the past few decades, developments in semiconductor detector technology provided an appropriate substitution for scintillation detectors in terms of high sensitivity, better energy resolution, and also high spatial resolution. One of the considered detectors is cadmium telluride (CdTe). The purpose of this paper is to review the CdTe semiconductor detector used in preclinical studies, small organ and small animal imaging, also research in nuclear medicine and other medical imaging modalities by a complete inspect on the material characteristics, irradiation principles, applications, and epitaxial growth method...
April 2017: World Journal of Nuclear Medicine
Aya Kishimoto, Jun Kataoka, Takanori Taya, Leo Tagawa, Saku Mochizuki, Shinji Ohsuka, Yuto Nagao, Keisuke Kurita, Mitsutaka Yamaguchi, Naoki Kawachi, Keiko Matsunaga, Hayato Ikeda, Eku Shimosegawa, Jun Hatazawa
In the field of nuclear medicine, single photon emission tomography and positron emission tomography are the two most common techniques in molecular imaging, but the available radioactive tracers have been limited either by energy range or difficulties in production and delivery. Thus, the use of a Compton camera, which features gamma-ray imaging of arbitrary energies from a few hundred keV to more than MeV, is eagerly awaited along with potential new tracers which have never been used in current modalities...
May 18, 2017: Scientific Reports
Jun Lu, Lingjing Lin, Huiyue Dong, Xin Meng, Fang Fang, Qinghua Wang, Lianghu Huang, Jianming Tan
Ectopic expression of musculo aponeurotic fibrosarcoma BZIP transcription factor (Maf) A, has previously been demonstrated to induce insulin expression in non‑β‑cell lines. Protein transduction domains acting as an alternative delivery strategy may deliver heterogeneous proteins into cells. A sequence of 11 arginine residues (11R) has been demonstrated to act as a particularly efficient vector to introduce proteins into various cell types. The present study constructed 11R‑fused MafA to achieve transduction of the protein into cellular membranes and subsequently examined the therapeutic effect of the MafA‑11R protein in streptozotocin‑induced diabetes...
June 2017: Molecular Medicine Reports
Bock Lim, Yu Yao, Alex Lin-I Huang, May Lin Yap, Ulrike Flierl, Jathushan Palasubramaniam, Maria T K Zaldivia, Xiaowei Wang, Karlheinz Peter
Progress in pharmaceutical development is highly-dependent on preclinical in vivo animal studies. Small animal imaging is invaluable for the identification of new disease markers and the evaluation of drug efficacy. Here, we report for the first time the use of a three-dimensional fluorescence bioimager called FLuorescence Emission Computed Tomography (FLECT) for the detection of a novel recombinant fluoroprobe that is safe, easily prepared on a large scale and stably stored prior to scan. This novel fluoroprobe (Targ-Cy7) comprises a single-chain antibody-fragment (scFvTarg), which binds exclusively to activated-platelets, conjugated to a near-infrared (NIR) dye, Cy7, for detection...
2017: Theranostics
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