Read by QxMD icon Read

Spectral CT

Peijun Shi, Jifen Wang, Yadong Zhao, Yuai Duan, Lin Shi, Yue Hou, Jingdan Hou, Wenjun Li, Tianyu Han
Two solid emitters DMA and HBA were synthetized, showing aggregation-induced emission (AIE) phenomenon. Incorporation of electron donor-acceptor (D-A) pairs endows the solid emitters with both charge transfer (CT) state emission and distinct solvatochromic effect. The compounds undergo a rapid interaction with amines followed by the resulting weakened electron withdrawing ability to yield florescent products with either hypochromatic shift or decrease in the emission intensity. DFT calculations on HOMO and LUMO electronic cloud distribution and energy levels have demonstrated that the transition from CT state to locally excited (LE) state is mainly responsible for the spectral changes...
February 1, 2018: Talanta
Duygu İnci, Rahmiye Aydın, Özgür Vatan, Yunus Zorlu, Nilüfer Çinkılıç
New binary copper(II) complexes, - [Cu(4-mphen)2(NO3)]NO3·H2O (1), [Cu(5-mphen)2 (NO3)]NO3·H2O (2), the known complex [Cu(dmphen)2(NO3)]NO3 (3) and [Cu(tmphen)2 (NO3)]NO3·H2O (4) - (4-mphen: 4-methyl-1,10-phenanthroline, 5-mphen: 5-methyl-1,10-phenanthroline, dmphen: 4,7-dimethyl-1,10-phenanthroline, tmphen: 3,4,7,8-tetramethyl-1,10-phenanthroline), have been synthesized and characterized by CHN analysis, ESI-MS, FTIR and single-crystal X-ray diffraction techniques. Interaction of these complexes with calf thymus DNA (CT-DNA) has been investigated by absorption spectral titration, ethidium bromide (EB) and Hoechst 33258 displacement assay and thermal denaturation measurement...
November 13, 2017: Journal of Biomolecular Structure & Dynamics
Prabhakar Rajiah, Rong Rong, Claudia Martinez-Rios, Negin Rassouli, Luis Landeras
OBJECTIVES: To evaluate the benefits and clinical significance of retrospectively generated spectral image-datasets with the novel detector-based Spectral CT (SDCT). METHODS: A total of 118 body CTs from the SDCT prototype were included. Based on the clinical indication, two radiologists were asked if they would have opted for a dual-energy mode/scan if the patient was scanned in one of the other commercially-available dual-energy scanners, which need prospective selection of dual energy mode...
October 31, 2017: Clinical Imaging
Jae Yong Park, Bum Gi Kim, Je Hyung Hwang, Jae Suk Kim
Purpose: To study the distribution of choroidal thickness (CT) in and outside of the vascular arcade, as well as at the fovea in healthy eyes using spectral-domain optical coherence tomography (OCT). Methods: Seventy healthy eyes were examined with OCT to obtain nine horizontal lines in and outside of the vascular arcade. Nine points including the central point of the line were chosen in 0.5-mm intervals to calculate CT. CT was measured at a total of 81 points in each patient to construct a map of CT distribution...
November 1, 2017: Investigative Ophthalmology & Visual Science
Kevin Kalisz, Sandra Halliburton, Suhny Abbara, Jonathon A Leipsic, Moritz H Albrecht, U Joseph Schoepf, Prabhakar Rajiah
Advances in scanner technology enabling shorter scan times, improvements in spatial and temporal resolution, and more dose-efficient data reconstruction coupled with rapidly growing evidence from clinical trials have established computed tomography (CT) as an important imaging modality in the evaluation of cardiovascular disorders. Multienergy (or spectral or dual-energy) CT is a relatively recent advance in which attenuation data from different energies are used to characterize materials beyond what is possible at conventional CT...
November 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
Ching-Wei Lin, Hailing Yang, Stephen R Sanchez, Weiqun Mao, Lan Pang, Kathleen Mary Beckingham, Robert C Bast, R Bruce Weisman
Biocompatible composites of single-walled carbon nanotubes in Matrigel have been surgically implanted into mouse ovaries and then noninvasively detected and located in the first in vivo demonstration of spectral triangulation. This optical method deduces the three-dimensional position of a short-wave IR emission source from the wavelength-dependent attenuation of fluorescence in tissues. Measurements were performed with a second-generation optical scanner that uses an LED matrix emitting at 736 nm for diffuse specimen excitation...
November 13, 2017: ACS Applied Materials & Interfaces
Elvira Orduna, Ana Sanchez-Cano, Maria José Luesma, Itziar Perez-Navarro, Emilio Abecia, Isabel Pinilla
BACKGROUND: We aimed to determine the physiological symmetry, with spectral-domain optical coherence tomography, of choroidal measurements in a healthy population in all the areas defined in the Early Treatment Diabetic Retinopathy Study (ETDRS). METHODS: One hundred and fifty-four eyes of 77 healthy young adults between the ages of 19 and 32 years were enrolled. Differences in choroidal thickness (CT) and volume (CV) between the left and right eyes were calculated...
November 10, 2017: Ophthalmic Research
Almudena Pérez-Lara, Reza Forghani
Spectral computed tomography (CT) or dual-energy CT (DECT) is an advanced form of CT with increasing applications in head and neck radiology. This article provides an overview of the DECT technique and reviews current applications for the evaluation of neck pathology, focusing on oncologic applications. Included are an overview of the basic underlying principles and approaches for DECT scan acquisition and material characterization; a discussion of various DECT reconstructions and a brief overview of practical issues pertaining to DECT implementation, including those related to workflow impact of DECT; and a discussion of various applications of DECT for the evaluation of the neck, especially in oncology...
February 2018: Magnetic Resonance Imaging Clinics of North America
Soo Buem Cho, Hye Jin Baek, Kyeong Hwa Ryu, Jin Il Moon, Bo Hwa Choi, Sung Eun Park, Kyungsoo Bae, Kyung Nyeo Jeon, Dong Wook Kim
PURPOSE: The purpose of this study was to investigate the clinical feasibility of spectral analyses using dual-layer detector spectral computed tomography (CT) in acute intracerebral haemorrhage (ICH). MATERIAL AND METHODS: We retrospectively reviewed patients with acute ICH who underwent CT angiography on a dual-layer detector spectral CT scanner. A spectral data analysis was performed to detect contrast enhancement in or adjacent to acute ICH by using spectral image reconstructions including monoenergetic (MonoE), virtual noncontrast (VNC), and iodine overlay fusion images...
2017: PloS One
Somasundaram Sangeetha, Mariappan Murali
A copper(II) complex [Cu(II)(quamol)Cl]·H2O, where H(quamol) is N-2-(quinolyl-methylidene)aminophenol, has been isolated. The solution structure of the complex has been assessed to be distorted square-planar. The complex displays a ligand field band in the visible region (608nm) and also show axial EPR spectrum in DMF at 77K with g||>g⊥ indicating a dx(2)-y(2) ground state. The g|| and A|| values of 2.265 and 153×10(-4)cm(-1), respectively, conform to a square-based CuN2OCl chromophore. The interaction of the complex with calf thymus (CT) DNA has been explored by using absorption (Kb=2...
November 2, 2017: International Journal of Biological Macromolecules
Yan Xing, Yuan Zhao, Ning Guo, Cun-Xue Pan, Gulina Azati, Yan-Wei Wang, Wen-Ya Liu
OBJECTIVE: Using a pulsating coronary artery phantom at high heart rate settings, we investigated the efficacy of a motion correction algorithm (MCA) to improve the image quality in dual-energy spectral coronary CT angiography (CCTA). MATERIALS AND METHODS: Coronary flow phantoms were scanned at heart rates of 60-100 beats/min at 10-beats/min increments, using dual-energy spectral CT mode. Virtual monochromatic images were reconstructed from 50 to 90 keV at 10-keV increments...
November 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
Neil MacRitchie, Gianluca Grassia, Jonathan Noonan, Paul Garside, Duncan Graham, Pasquale Maffia
To accurately predict atherosclerotic plaque progression, a detailed phenotype of the lesion at the molecular level is required. Here, we assess the respective merits and limitations of molecular imaging tools. Clinical imaging includes contrast-enhanced ultrasound, an inexpensive and non-toxic technique but with poor sensitivity. CT benefits from high spatial resolution but poor sensitivity coupled with an increasing radiation burden that limits multiplexing. Despite high sensitivity, positron emission tomography and single-photon emission tomography have disadvantages when applied to multiplex molecular imaging due to poor spatial resolution, signal cross talk and increasing radiation dose...
October 23, 2017: Heart: Official Journal of the British Cardiac Society
Saravanabavaan Suntharalingam, Thomas Allmendinger, Sebastian Blex, Mohammad Al-Bayati, Kai Nassenstein, Bernd Schweiger, Michael Forsting, Axel Wetter
RATIONALE AND OBJECTIVES: This study aimed to determine the optimal tube potential for unenhanced chest computed tomographies (CTs) with age-related phantoms. MATERIALS AND METHODS: Three physical anthropomorphic phantoms (newborn, 5-year-old child, and adult) were scanned on a third-generation dual-source CT using CAREkV in semi-mode and CAREDose4D (ref. KV: 120; ref. mAs 50). Scans were performed with all available tube potentials (70-150 kV and Sn150 kV). The lowest volume computed tomography dose index (CTDIvol) was selected to perform additional Sn100-kV scans with matched and half (Sn100-half) CTDIvol value...
October 18, 2017: Academic Radiology
K X Cheong, L W Lim, K Z Li, C S Tan
PurposeChoroidal thickness (CT) measurements are typically obtained from manual segmentation of optical coherence tomography (OCT) B-scans. This method is time-consuming. We aimed to describe a novel and faster technique to obtain CT measurements.Patients and methodsIn a prospective cohort study of 200 healthy eyes, Spectral-Domain OCT with enhanced depth imaging were performed with the Spectralis OCT using standardised imaging protocols. The OCT scans were independently graded by reading centre-certified graders...
October 20, 2017: Eye
Junichi Kishimoto, Yasutoshi Ohta, Shinichiro Kitao, Tomomi Watanabe, Toshihide Ogawa
Single-source dual-energy CT (ssDECT) allows the reconstruction of iodine density images (IDIs) from projection based computing. We hypothesized that adding adaptive statistical iterative reconstruction (ASiR) could improve image quality. The aim of our study was to evaluate the effect and determine the optimal blend percentages of ASiR for IDI of myocardial late iodine enhancement (LIE) in the evaluation of chronic myocardial infarction using ssDECT. A total of 28 patients underwent cardiac LIE using a ssDECT scanner...
October 19, 2017: International Journal of Cardiovascular Imaging
Yingmei Wang, Ge Wang, Shuwei Mao, Wenxiang Cong, Zhilong Ji, Jian-Feng Cai, Yangbo Ye
Standard computed tomography (CT) cannot reproduce spectral information of an object. Hardware solutions include dual-energy CT which scans the object twice in different x-ray energy levels, and energy-discriminative detectors which can separate lower and higher energy levels from a single x-ray scan. In this paper, we propose a software solution and give an iterative algorithm that reconstructs an image with spectral information from just one scan with a standard energy-integrating detector. The spectral information obtained can be used to produce color CT images, spectral curves of the attenuation coefficient μ(r, E)at points inside the object, and photoelectric images, which are all valuable imaging tools in cancerous diagnosis...
November 2016: Inverse Problems
David Martin McClatchy Iii, Elizabeth J Rizzo, Jeff Meganck, Josh Kempner, Jared Vicory, Wendy A Wells, Keith D Paulsen, Brian W Pogue
A multimodal micro-computed tomography (CT) and multi-spectral structured light imaging (SLI) system is introduced and systematically analyzed to test its feasibility to aid in margin delineation during breast conserving surgery (BCS). Phantom analysis of the micro-CT yielded a signal-to-noise ratio (SNR) of 34, a contrast of 1.64, and a minimum detectable resolution of 240 m for a 1.2 min scan. The SLI system, spanning wavelengths 490 nm to 800 nm and spatial frequencies up to 1.37 mm-1, was evaluated with aqueous tissue simulating phantoms having variations in particle size distribution, scatter density, and blood volume fraction...
October 19, 2017: Physics in Medicine and Biology
Yi Zhang, Yan Xi, Qingsong Yang, Wenxiang Cong, Jiliu Zhou, Ge Wang
Photon-counting detectors can acquire x-ray intensity data in different energy bins. The signal to noise ratio of resultant raw data in each energy bin is generally low due to the narrow bin width and quantum noise. To address this problem, here we propose an image reconstruction approach for spectral CT to simultaneously reconstructs x-ray attenuation coefficients in all the energy bins. Because the measured spectral data are highly correlated among the x-ray energy bins, the intra-image sparsity and inter-image similarity are important prior acknowledge for image reconstruction...
December 2016: IEEE Transactions on Computational Imaging
Adam P Harrison, Ziyue Xu, Amir Pourmorteza, David A Bluemke, Daniel J Mollura
No abstract text is available yet for this article.
October 2017: Medical Physics
Akinori Shimizu, Yoshihisa Inoue, Tadashi Mori
The circular dichroisms (CDs) of dimethoxy[2.2]-, [3.2]-, and [3.3]pyridinophanes and their protonated forms were investigated experimentally and theoretically. Characteristic multisignate Cotton effects (CEs), typical for planar chiral cyclophane derivatives, were observed. The CD spectral pattern was quite comparable for the staggered forms of [2.2]-, [3.2]-, and [3.3]cyclophanes, but significantly differed for the eclipsed forms. More interestingly, the patterns resembled, but the CE signs were practically opposite between staggered and eclipsed [2...
October 25, 2017: Journal of Physical Chemistry. A
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"