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https://www.readbyqxmd.com/read/29148891/hyperventilation-and-breath-holding-test-with-indocyanine-green-kinetics-predicts-cerebral-hyperperfusion-after-carotid-artery-stenting
#1
Ichiro Nakagawa, Shohei Yokoyama, Daisuke Wajima, Fumihiko Nishimura, Shuichi Yamada, Hiroshi Yokota, Yasushi Motoyama, Young Su Park, Takeshi Wada, Kimihiko Kichikawa, Hiroyuki Nakase
Cerebral hyperperfusion syndrome (CHS) is a serious complication following carotid artery stenting (CAS), but definitive early prediction of CHS has not been established. Here, we evaluated whether indocyanine green kinetics and near-infrared spectroscopy (ICG-NIRS) with hyperventilation (HV) and the breath-holding (BH) test can predict hyperperfusion phenomenon after CAS. The blood flow index (BFI) ratio during HV and BH was prospectively monitored using ICG-NIRS in 66 patients scheduled to undergo CAS. Preoperative cerebrovascular reactivity (CVR) and the postoperative asymmetry index (AI) were also assessed with single-photon emission computed tomography before and after CAS and the correlation with the BFI HV/rest ratio, BFI BH/rest ratio was evaluated...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29148698/chelator-free-conjugation-of-99mtc-and-gd3-to-pegylated-nanographene-oxide-for-dual-modality-spect-mr-imaging-of-lymph-nodes
#2
Tianye Cao, Xiaobao Zhou, Yingying Zheng, Yuyun Sun, Jian Zhang, Wei Chen, Jianping Zhang, Zhiguo Zhou, Shi-Ping Yang, Yingjian Zhang, Hong Yang, Ming-Wei Wang
PEGylated ultra-small nanographene oxide (usNGO-PEG) has exhibited great potential in nanotheranostics due to its newly-discovered physicochemical properties derived from the rich functional groups and  bonds. Herein, we developed a general, simple and kit-like preparation approach for 99mTcI- and Gd-anchored NGO-PEG using a chelator-free strategy. In this strategy, [99mTcI(CO)3(OH2)3]+ (abbreviated to 99mTcI) and GdCl3 were mixed with usNGO-PEG to yield 99mTc- and Gd-usNGO-PEG via the synergistic coordination of N and O atoms from NGO and PEG with 99mTcI and Gd3+ without additional exogenous chelators...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29147830/asymptomatic-adult-intrapericardial-diaphragmatic-hernia-detected-on-cardiac-spect-ct
#3
Muhammad Yasir Adeel, Saad Sikanderkhel, Zartashia Shahab, Isabel Oliva, Jaime Gerber
An 83-year-old man underwent exercise stress test with single photon emission computed tomography (SPECT) myocardial perfusion imaging for new electrocardiogram (EKG) changes. The stress EKG did not show any significant changes. Myocardial perfusion imaging with SPECT demonstrated an inferior wall defect and extracardiac uptake of nuclear tracer. Simultaneous cardiac computed tomography performed for attenuation correction showed presence of intrapericardial hepatic tissue in an anterior diaphragmatic hernia...
November 16, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29146434/cerebral-hyperperfusion-syndrome-after-endovascular-reperfusion-therapy-in-a-patient-with-acute-internal-carotid-artery-and-middle-cerebral-artery-occlusions
#4
Tetsuya Hashimoto, Shoji Matsumoto, Mitsushige Ando, Hideo Chihara, Atsushi Tsujimoto, Taketo Hatano
BACKGROUND: Cerebral hyperperfusion syndrome (CHS) is known to be a rare but devastating complication of carotid artery revascularization. Because patients with acute ischemic stroke due to acute major cerebral and/or cervical artery occlusion treated with endovascular reperfusion therapy may have impaired autoregulation in the cerebral vasculature, these patients may also develop CHS. Despite the growing number of endovascular reperfusion procedures for acute ischemic stroke, this complication has only rarely been reported...
November 13, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29145285/degeneration-of-paramedian-nuclei-in-the-thalamus-induces-holmes-tremor-in-a-case-of-artery-of-percheron-infarction
#5
Tz-Shiang Wei, Chun-Sheng Hsu, Yu-Chun Lee, Shin-Tsu Chang
RATIONALE: Holmes' tremor is an uncommon neurologic disorder following brain insults, and its pathogenesis is undefined. The interruption of the dento-rubro-thalamic tract and secondary deterioration of the nigrostriatal pathway are both required to initiate Holmes' tremor. We used nuclear medicine imaging tools to analyze a patient with concurrent infarction in different zones of each side of the thalamus. Finding whether the paramedian nuclear groups of the thalamus were injured was a decisive element for developing Holmes' tremor...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29144283/large-purcell-enhancement-with-efficient-one-dimensional-collection-via-coupled-nanowire-nanorod-system
#6
Xueke Duan, Juanjuan Ren, Fan Zhang, He Hao, Guowei Lu, Qihuang Gong, Ying Gu
Combining the advantages of both gap surface plasmons and evanescent waves, we demonstrate simultaneously large Purcell enhancement and efficient one- dimensional collection of photons at subwavelength scale in the coupled nanowire- nanorod system. The spontaneous emission can be enhanced by thousands of times based on the excitation of gap surface plasmons with strongly localized electromagnetic field. Emitted photons are directly collected by subwavelength-confined evanescent modes and guided along the nanowire...
November 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29143354/synthesis-and-biological-properties-of-radiohalogenated-%C3%AE-%C3%AE-disubstituted-amino-acids-for-pet-and-spect-imaging-of-amino-acid-transporters-aats
#7
Mark M Goodman, Weiping Yu, Nashwa Jarkas
Fluorine-18 and iodine-123 labeled non-natural alicyclic and methyl branched disubstituted α,α-amino acids are a diverse and useful class of tumor imaging agents suitable for positron emission tomography (PET) and single photon emission computed tomography (SPECT). These tracers target the increased expression of the cell membrane amino acid transporter systems L, ASC and A exhibited by many human tumor cells. The most established clinical use for these radiolabeled amino acids is imaging primary and recurrent gliomas, and primary, recurrent and metastatic prostate cancer...
November 16, 2017: Journal of Labelled Compounds & Radiopharmaceuticals
https://www.readbyqxmd.com/read/29142361/tubular-intestinal-duplication-harboring-gastric-ectopia-accurately-diagnosed-by-tc-99m-pertechnetate-single-photon-emission-computed-tomography-computed-tomography-meckel-s-scan
#8
Ioannis Spyridakis, Domenica Lopresti, Stamata Georga, Chrysostomos Kepertis, Ioannis Efstratiou, Georgios Arsos
A 7-year-old girl with an episode of hematochezia and melena, suspicious for bleeding Meckel's diverticulum, was referred for a Tc-99m pertechnetate Meckel's scan. On dynamic planar scan, apart from prompt gastric visualization an oval-shaped, area of inhomogeneous tracer uptake was observed in the left lower quadrant of the abdomen. Subsequent single-photon emission computed tomography/computed tomography localized this to intestinal lumen, thus establishing the diagnosis of intestinal duplication (ID) with functional gastric mucosa...
October 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/29142341/in-house-preparation-and-quality-control-of-tc99m-trodat-1-for-diagnostic-single-photon-emission-computed-tomography-computed-tomography-imaging-in-parkinson-s-disease
#9
Rakhee Vatsa, Jaya Shukla, Bhagwant Rai Mittal, Apurva Sood, Raman Kumar Joshi, Kanchan Palarwal, Priya Bhusari, Manish Modi
Purpose of Study: Loss of dopamine neurons in the brain is a characteristic feature of Parkinson's disease (PD). TRODAT-1 is a tropane derivative that binds to dopamine transporter (DAT) receptors. It can be used for noninvasive in vivo imaging of DAT receptors leading to the early detection of PD. The present study aims to optimize the in-house radiolabeling of TRODAT-1 with Tc-99 m in hospital radiopharmacy set up along with performing single-photon emission computed tomography/computed tomography imaging in patients with PD...
October 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/29141443/effects-of-wavelength-fluence-and-dose-on-fragmentation-pathways-and-photoproduct-ion-yield-in-213%C3%A2-nm-and-266%C3%A2-nm-ultraviolet-photodissociation-experiments
#10
Simon Becher, Bernhard Spengler, Sven Heiles
Ultraviolet photodissociation tandem mass spectrometry is a powerful tool to investigate the structure of biomolecules, due to its ability to generate rich fragmentation patterns or bond selective cleavage, as a function of used laser wavelength, laser fluence, dose (number of accumulated laser pulses), and available chromophores. Herein, we report first results obtained with a newly developed two-wavelength (266 nm and 213 nm) ultraviolet photodissociation setup coupled to a Fourier-transform ion cyclotron resonance mass spectrometer...
January 1, 2017: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/29141430/lithium-atoms-on-helium-nanodroplets-rydberg-series-and-ionization-dynamics
#11
Florian Lackner, Günter Krois, Wolfgang E Ernst
The electronic excitation spectrum of lithium atoms residing on the surface of helium nanodroplets is presented and analyzed employing a Rydberg-Ritz approach. Utilizing resonant two-photon ionization spectroscopy, two different Rydberg series have been identified: one assigned to the nS(Σ) series and the other with predominantly nP(Π) character. For high Rydberg states, which have been resolved up to n = 13, the surrounding helium effectively screens the valence electron from the Li ion core, as indicated by the apparent red-shift of Li transitions and lowered quantum defects on the droplet with respect to their free atom counterparts...
November 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29141241/mmp-9-and-its-regulators-timp-1-and-emmprin-in-patients-with-acute-st-elevation-myocardial-infarction-a-nordistemi-substudy
#12
Trine Baur Opstad, Ingebjørg Seljeflot, Ellen Bøhmer, Harald Arnesen, Sigrun Halvorsen
OBJECTIVES: The extracellular matrix is involved in wound repair after acute myocardial infarction (AMI). We investigated whether matrix metalloproteinase (MMP)-9, tissue inhibitor of metalloproteinases (TIMP)-1, and the MMP inducer (EMMPRIN) are associated with infarct size, left ventricular function, and clinical outcome in ST-elevation-MI (STEMI). METHODS: In 243 STEMI patients, circulating EMMPRIN, MMP-9, and TIMP-1 were analyzed 3 days and 3 months post-AMI...
November 16, 2017: Cardiology
https://www.readbyqxmd.com/read/29137036/attenuation-and-scatter-correction-in-i-123-fp-cit-spect-do-not-affect-the-clinical-diagnosis-of-dopaminergic-system-neurodegeneration
#13
Miho Akahoshi, Koichiro Abe, Yumiko Uchiyama, Mitsuru Momose, Kenji Fukushima, Kazuo Kitagawa, Shuji Sakai
The purpose of this study was to assess the influence of different reconstruction factors in N-ω-fluoropropyl-2β-carbomethoxy-3β-(4-I-123 iodophenyl)nortropane (I-123 FP-CIT) single-photon emission computed tomography (SPECT) images for the diagnosis of dopaminergic system neurodegeneration (DSND).Seventy-three patients (38 females, 35 males) suspected of DSND were included in this study. The patients were divided into 3 groups on the basis of their final clinical diagnoses; patients with Parkinson disease (group 1, n = 36), patients with other DSND (group 2, n = 19), patients without DSND (group 3, n = 18)...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29135721/clinical-outcomes-and-prognostic-factors-of-radioiodine-ablation-therapy-for-lymph-node-metastases-from-papillary-thyroid-carcinoma
#14
Xinyu Wu, Hao Gu, Yongju Gao, Bo Li, Ruitai Fan
OBJECTIVE: A total of 118 patients with papillary thyroid carcinoma treated with radioactive iodine for lymph node metastases were analyzed retrospectively between August 2008 and June 2014. We describe the clinical course of these patients and focus on factors associated with lymph node metastases response to iodine-131 (I) treatment. PATIENTS AND METHODS: A total of 118 postoperative papillary thyroid carcinoma patients who underwent I treatment with lymph nodes as the only site of metastasis on whole-body scan (I Rx-WBS) and single-photon emission computed tomography-computed tomography (SPECT-CT) were enrolled...
November 10, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/29133699/referral-practice-reporting-standards-and-the-impact-of-dopamine-transporter-scans-done-in-a-tertiary-hospital
#15
Shakya Bhattacharjee, Albi J Chalissery, Tim Barry, Donagh O'Sullivan, Martin O'Connell, Timothy Lynch
AIMS: We studied the referral practice, reporting standards, and the impact of 123 ioflupane single photon emission computed tomogram dopamine transporters (DAT-SPECT) scans conducted for the diagnosis and clinical management of patients. SETTINGS AND DESIGNS: The present study was a retrospective, non-interventional study. MATERIALS AND METHODS: We assessed the DAT scan referral and the official reports available from the Nuclear Medicine Department of the Mater Misericordiae University Hospital over 1 year (2013)...
November 2017: Neurology India
https://www.readbyqxmd.com/read/29131963/hybrid-integration-of-solid-state-quantum-emitters-on-a-silicon-photonic-chip
#16
Je-Hyung Kim, Shahriar Aghaeimeibodi, Christopher J K Richardson, Richard P Leavitt, Dirk Englund, Edo Waks
Scalable quantum photonic systems require efficient single photon sources coupled to integrated photonic devices. Solid-state quantum emitters can generate single photons with high efficiency, while silicon photonic circuits can manipulate them in an integrated device structure. Combining these two material platforms could, therefore, significantly increase the complexity of integrated quantum photonic devices. Here, we demonstrate hybrid integration of solid-state quantum emitters to a silicon photonic device...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29131690/investigating-ioflupane-i-123-injection-and-single-photon-emission-tomography-as-an-imaging-biomarker-for-long-term-sequelae-following-mild-traumatic-brain-injury
#17
Nicole Reams, Julie Anderson, Reid Perlman, Wei Li, Shaun Walters, Samuel Tideman, Chi Wang, Kelly Simon, Roberta Frigerio, Demetrius M Maraganore
OBJECTIVE: To determine whether there were differences in clinical outcomes for ioflupane I(123) injection (DaTscan) and single photon emission tomography consistent with early Parkinson's disease (PD) among individuals with a history of mild traumatic brain injury (mTBI). METHODS: We performed a case-control study among patients presenting to the Emergency Room (ER) during 2006-2013 with mTBI (cases, n = 34) or without mTBI (controls, n = 33). We performed clinical and imaging measurements in cases and controls at least 1-year post-presentation to the ER (average three years four months)...
November 13, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/29129928/self-probing-spectroscopy-of-xuv-photo-ionization-dynamics-in-atoms-subjected-to-a-strong-field-environment
#18
Doron Azoury, Michael Krüger, Gal Orenstein, Henrik R Larsson, Sebastian Bauch, Barry D Bruner, Nirit Dudovich
Single-photon ionization is one of the most fundamental light matter interactions in nature, serving as a universal probe of the quantum state of matter. By probing the emitted electron, one can decode the full dynamics of the interaction. When photo-ionization is evolving in the presence of a strong laser field, the fundamental properties of the mechanism can be signicantly altered. Here we demonstrate how the liberated electron can perform a self-probing measurement of such interaction with attosecond precision...
November 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/29129545/predicting-progression-of-amnesic-mci-the-integration-of-episodic-memory-impairment-with-perfusion-spect
#19
Davide Quaranta, Guido Gainotti, Daniela Di Giuda, Maria Gabriella Vita, Fabrizio Cocciolillo, Giordano Lacidogna, Valeria Guglielmi, Carlo Masullo, Alessandro Giordano, Camillo Marra
The present study aimed at assessing if the ability to predict progression from amnesic Mild Cognitive Impairment (aMCI) to dementia is improved by considering the presence at the baseline of Single Photon Emission Computed Tomography (SPECT) perfusion abnormalities in addition to a defect of long term memory. The Episodic Memory Score (EMS), a global index which integrates results obtained in subtests of the Rey's Verbal Learning Test and the Rey-Osterrieth Figure recall, were taken into account to evaluate defects of long term memory...
October 24, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/29127396/infrared-single-photon-detector-based-on-optical-up-converter-at-1550%C3%A2-nm
#20
Peng Bai, Y H Zhang, W Z Shen
High performance single photon detector at the wavelength of 1550 nm has drawn wide attention and achieved vast improvement due to its significant application in quantum information, quantum key distribution, as well as cosmology. A novel infrared up-conversion single photon detector (USPD) at 1550 nm was proposed to work in free-running regime based on the InGaAs/ InP photodetector (PD)- GaAs/AlGaAs LED up-converter and Si single photon avalanche diode (SPAD). In contrast to conventional In0.53Ga0.47As SPAD, the USPD can suppress dark count rate and afterpulsing efficiently without sacrificing the photon detection efficiency (PDE)...
November 10, 2017: Scientific Reports
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