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quantitative image analysis

Ireneusz Sowa, Magdalena Wójciak-Kosior, Maciej Strzemski, Jan Sawicki, Michał Staniak, Sławomir Dresler, Wojciech Szwerc, Jarosław Mołdoch, Michał Latalski
Polyaniline (PANI) is one of the best known conductive polymers with multiple applications. Recently, it was also used in separation techniques, mostly as a component of composites for solid-phase microextraction (SPME). In the present paper, sorbent obtained by in situ polymerization of aniline directly on silica gel particles (Si-PANI) was used for dispersive solid phase extraction (d-SPE) and matrix solid-phase extraction (MSPD). The efficiency of both techniques was evaluated with the use of high performance liquid chromatography with diode array detection (HPLC-DAD) quantitative analysis...
March 22, 2018: Materials
Melissa Preissner, Rhiannon P Murrie, Isaac Pinar, Freda Werdiger, Richard P Carnibella, Graeme R Zosky, Andreas Fouras, Stephen Dubsky
We have developed an X-ray imaging system for <i>in vivo</i> four-dimensional computed tomography (4DCT) of small animals for pre-clinical lung investigations. Our customized laboratory facility is capable of high resolution <i>in vivo</i> imaging at high frame rates. Characterization using phantoms demonstrate a spatial resolution of slightly below 50 μm at imaging rates of 30 Hz, and the ability to quantify material density differences of at least 3%...
March 22, 2018: Physics in Medicine and Biology
Guan-Min Quan, Yong-Li Zheng, Tao Yuan, Jian-Ming Lei
To evaluate the prognostic value of fluid-attenuated inversion recovery (FLAIR) signal intensity of postoperative cavity on progression free survival (PFS) and overall survival (OS) in patients with high-grade gliomas (HGG). This study retrospectively enrolled 45 consecutive HGG patients. These patients had chemoradiotherapy after gross-total resection of tumors. Quantitative analysis of the FLAIR signal intensity in postoperative cavity and background was made. We evaluated the threshold value, accuracy, sensitivity, specificity, and survival state with this technique...
March 21, 2018: Journal of Neuro-oncology
Norbert Donhauser, Stefanie Heym, Andrea K Thoma-Kress
The Human T-cell leukemia virus type 1 (HTLV-1)-encoded accessory protein p8 is cleaved from the precursor protein p12 encoded by the HTLV-1 open reading frame I. Both p12 and p8 are thought to contribute to efficient viral persistence. Mechanistically, p8 induces T-cell conjugates and cellular conduits. The latter are considered to facilitate transfer of p8 to target cells and virus transmission. Transfer of p8 between p8-expressing T-cells and recipient cells has been analyzed by immunofluorescence and live imaging...
2018: Frontiers in Microbiology
Soomin Jeon, Chang-Ock Lee
BACKGROUND: Streak artifacts in computed tomography (CT) images caused by metallic objects limit the wider use of CT imaging technologies. There have been various attempts to improve CT images containing streak artifacts; however, most of them generate additional artifacts or do not completely eradicate existing artifacts. OBJECTIVE: In this paper, we propose a novel algorithm which reduces streak artifacts in CT images. METHODS: Using CT numbers reconstructed from a given sinogram, we extract the metal part M and the surrounding area C with similar CT numbers...
March 15, 2018: Journal of X-ray Science and Technology
Ivan Wen Wen Lau, Dongting Liu, Lei Xu, Zhanming Fan, Zhonghua Sun
OBJECTIVE: Current diagnostic assessment tools remain suboptimal in demonstrating complex morphology of congenital heart disease (CHD). This limitation has posed several challenges in preoperative planning, communication in medical practice, and medical education. This study aims to investigate the dimensional accuracy and the clinical value of 3D printed model of CHD in the above three areas. METHODS: Using cardiac computed tomography angiography (CCTA) data, a patient-specific 3D model of a 20-month-old boy with double outlet right ventricle was printed in Tango Plus material...
2018: PloS One
Satoshi Nozaki, Aya Mawatari, Yuka Nakatani, Emi Hayashinaka, Yasuhiro Wada, Yukihiro Nomura, Takahito Kitayoshi, Kouji Akimoto, Shinji Ninomiya, Hisashi Doi, Yasuyoshi Watanabe
PURPOSE: Thiamine is an essential component of glucose metabolism and energy production. The disulfide derivative, thiamine tetrahydrofurfuryl disulfide (TTFD), is better absorbed than readily-available water-soluble thiamine salts because it does not require the rate-limiting transport system required for thiamine absorption. However, the detailed pharmacokinetics of thiamine and TTFD under normal and pathological conditions have not yet been clarified. C-11-labeled thiamine and TTFD were recently synthesized by our group...
March 20, 2018: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
Azuma Takahashi, Xiaodong Zhu, Yusuke Aoyama, Mitsuo Umezu, Kiyotaka Iwasaki
The evaluation of strain induced in a blood vessel owing to contact with a medical device is of significance to examine the causes leading to vascular injury and rupture. The development of a method to assess strain in largely deformed elastic materials is expected. This study's scope was to measure strain in deformed tubular elastic mock vessels using tomographic particle image velocimetry (tomo-PIV), and to show the applicability of this measurement method by comparing the results with data derived from a finite element analysis (FEA)...
March 20, 2018: Cardiovascular Engineering and Technology
Byung Hyun Baek, Hyung Seok Kim, Woong Yoon, Yun Young Lee, Jang Mi Baek, Eun Hee Kim, Seul Kee Kim
Objective: In this study we investigate the association between the expression of inflammatory mediators measured in clots retrieved by mechanical thrombectomy, stroke etiology, and the susceptibility vessel sign (SVS) on gradient-echo (GRE) MR imaging in acute ischemic stroke patients. Methods: We performed molecular analysis of intracranial clots retrieved by mechanical thrombectomy from 82 patients with acute stroke. Seventy-two of these patients underwent GRE imaging before endovascular therapy...
March 2018: Annals of Clinical and Translational Neurology
Marie Gerisch, Jan Smettan, Sabine Ebert, Maria Athelogou, Beate Brand-Saberi, Nick Spindler, Wolf C Mueller, Shibashish Giri, Augustinus Bader
We aimed to identify and quantify CD117+ and CD90+ endogenous cardiac progenitor cells (CPC) in human healthy and diseased hearts. We hypothesize that these cells perform a locally acting, contributing function in overcoming medical conditions of the heart by endogenous means. Human myocardium biopsies were obtained from 23 patients with the following diagnoses: Dilatative cardiomyopathy (DCM), ischemic cardiomyopathy (ICM), myocarditis, and controls from healthy cardiac patients. High-resolution scanning microscopy of the whole slide enabled a computer-based immunohistochemical quantification of CD117 and CD90...
2018: Frontiers in Genetics
Yin Yuan, Xiu-Yue Xu, Jie Lao, Xin Zhao
Nerve transfer is the most common treatment for total brachial plexus avulsion injury. After nerve transfer, the movement of the injured limb may be activated by certain movements of the healthy limb at the early stage of recovery, i.e., trans-hemispheric reorganization. Previous studies have focused on functional magnetic resonance imaging and changes in brain-derived neurotrophic factor and growth associated protein 43, but there have been no proteomics studies. In this study, we designed a rat model of total brachial plexus avulsion injury involving contralateral C7 nerve transfer...
February 2018: Neural Regeneration Research
Li Liu, Bo Yin, Kawai Shek, Daoying Geng, Yiping Lu, Jianbo Wen, Xinping Kuai, Weijun Peng
Objective To investigate the role of quantitative analysis of T2 relaxation time in the magnetic resonance imaging (MRI) diagnosis of breast cancer. Methods The study enrolled patients with clinical breast masses who were examined using MRI at eight different echo times. The differences in T2 relaxation time of benign and malignant breast lesions were analysed. Results A total of 67 patients (67 breast lesions: 46 malignant, 21 benign) were examined. The mean ± SD T2 relaxation time was significantly lower in the 46 malignant lesions compared with the 21 benign lesions (82...
January 1, 2018: Journal of International Medical Research
Jang Yoo, Bom Sahn Kim, Hai-Jeon Yoon
OBJECTIVE: We evaluated the significance of breast-specific gamma imaging (BSGI) for determination of upstaging to invasive cancer from preoperative ductal carcinoma in situ (DCIS). METHODS: This study enrolled 168 patients with 175 breast lesions diagnosed as DCIS on core-needle biopsy that subsequently underwent preoperative BSGI between September 2011 and October 2017. Both qualitative and quantitative analyses using tumor-to-normal background ratio (TNR) and coefficient of variation (COV) were performed, and the predictive significance for upstaging to invasive cancer was investigated...
March 19, 2018: Annals of Nuclear Medicine
Takashi Shirakawa, Masao Yoshitatsu, Yasushi Koyama, Akira Kurata, Toru Miyoshi, Hiroki Mizoguchi, Takafumi Masai, Koichi Toda, Yoshiki Sawa
Determining the complex geometry of mitral valve prolapse is often difficult. We constructed 3D models of six prolapsed mitral valves for surgical assessment, and evaluated how accurately the models could replicate individual valve dimensions. 3D polygon data were constructed based on an original segmentation method for computed tomography images. The model's replication performance was confirmed via dimensional comparison between the actual hearts during surgery and those models. The results revealed that the prolapsed segments matched in all cases; however, torn chordae were replicated in four cases...
March 19, 2018: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
Aleksandra Aljakna, Estelle Lauer, Sébastien Lenglet, Silke Grabherr, Tony Fracasso, Marc Augsburger, Sara Sabatasso, Aurélien Thomas
Simultaneous assessment of a panel of protein markers is becoming essential in order to enhance biomarker research and improve diagnostics. Specifically, postmortem diagnostics of early myocardial ischemia in sudden cardiac death cases could benefit from a multiplex marker assessment in the same tissue section. Current analytical antibody-based techniques (immunohistochemistry and immunofluorescence) limit multiplex analysis usually to not more than three antibodies. In this study, mass spectrometry-immunohistochemistry (MS-IHC) was performed by combining laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) with rare-metal-isotope-tagged antibodies as a technique for multiplex analysis of human postmortem myocardial tissue samples...
March 19, 2018: International Journal of Legal Medicine
Hai-Ming Li, Feng Feng, Jin-Wei Qiang, Guo-Fu Zhang, Shu-Hui Zhao, Feng-Hua Ma, Yong-Ai Li, Wei-Yong Gu
PURPOSE: This study aimed to investigate the diagnostic performance of quantitative DCE-MRI for characterizing ovarian tumors. METHODS: We prospectively assessed the differences of quantitative DCE-MRI parameters (Ktrans , kep , and ve ) among 15 benign, 28 borderline, and 66 malignant ovarian tumors; and between type I (n = 28) and type II (n = 29) of epithelial ovarian carcinomas (EOCs). DCE-MRI data were analyzed using whole solid tumor volume region of interest (ROI) method, and quantitative parameters were calculated based on a modified Tofts model...
March 20, 2018: Abdominal Radiology
Prasad R Shankar, Matthew S Davenport, Sean A Woolen, Ruth C Carlos, Katerine E Maturen
Survey research is appealing to many clinical researchers, including radiologists. Emerging interest in patient preferences and patient-centered outcomes related to imaging likely will stimulate additional use of questionnaires in our field. However, like other quantitative methods, survey-based research requires meticulous planning, execution, and analysis to generate reliable results and support meaningful conclusions. The purpose of this review is to provide a guideline for radiologists embarking on this type of research, with attention to questionnaire design, sampling, survey administration, and analysis...
March 16, 2018: Academic Radiology
Jing Huang, Peng Guo, Marsha A Moses
The acquisition of the angiogenic phenotype is an essential component of the escape from tumor dormancy. Although several classic in vitro assays (e.g., proliferation, migration, and others) and in vivo models have been developed to investigate and characterize angiogenic and non-angiogenic cell phenotypes, these methods are time and labor intensive, and often require expensive reagents and instruments, as well as significant expertise. In a recent study, we used a novel quantitative phase imaging (QPI) technique to conduct time-lapse and labeling-free characterizations of angiogenic and non-angiogenic human osteosarcoma KHOS cells...
February 16, 2018: Journal of Visualized Experiments: JoVE
Milena L Pachowsky, Arnd Kleyer, Lisa Wagner, Andreas Langenbach, David Simon, Rolf Janka, Matthias May, Goetz H Welsch
Objective A minimally invasive treatment of osteoporotic and nonosteoporotic thoracic and lumbar spine fractures is cement augmentation (kyphoplasty). Little is known about the impact on adjacent intervertebral discs. A quantitative magnetic resonance imaging (MRI) approach in addition to morphological MRI is desirable to evaluate changes in the intervertebral disc. Our study aims to evaluate the feasibility of T2 mapping for the detection of subtle changes in the intervertebral discs in spines after kyphoplasty...
March 1, 2018: Cartilage
Shihao Ran, Sebastian Berisha, Rupali Mankar, Wei-Chuan Shih, David Mayerich
Infrared (IR) spectroscopic microscopes provide the potential for label-free quantitative molecular imaging of biological samples, which can be used to aid in histology, forensics, and pharmaceutical analysis. Most IR imaging systems use broadband illumination combined with a spectrometer to separate the signal into spectral components. This technique is currently too slow for many biomedical applications such as clinical diagnosis, primarily due to the availability of bright mid-infrared sources and sensitive MCT detectors...
February 1, 2018: Biomedical Optics Express
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