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Brain SPECT

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https://www.readbyqxmd.com/read/29774142/comparison-of-mri-and-123-i-fp-cit-spect-for-the-evaluation-of-msa-p-clinical-severity
#1
Miki Nishimori, Yoriko Murata, Hitomi Iwasa, Kana Miyatake, Michiko Tadokoro, Shino Kohsaki, Munenobu Nogami, Norihiko Hamada, Hitoshi Ninomiya, Yasushi Osaki, Hirokazu Furuya, Takuji Yamagami
The aim of the present study was to compare the efficacy of magnetic resonance imaging (MRI) and 123 I-labeled 2β-carbomethoxy-3β-(4-iodophenyl)-N-(3-fluoropropyl)nortropane single photon emission computed tomography (123 I-FP-CIT SPECT) for determining the clinical severity of patients with multiple system atrophy with Parkinsonism (MSA-P). MRI and 123 I-FP-CIT SPECT images from 17 patients with MSA-P as diagnosed using the Unified MSA Rating Scale part IV (UMSARS IV) score were compared. Brain MRI scans were available for all 17 patients and 123 I-FP-CIT SPECT images were available for 12 patients...
June 2018: Biomedical Reports
https://www.readbyqxmd.com/read/29771718/evaluation-of-drug-effects-on-cerebral-blood-flow-and-glucose-uptake-in-un-anesthetized-and-un-stimulated-rats-application-of-free-moving-apparatus-enabling-to-keep-rats-free-during-pet-spect-tracer-injection-and-uptake
#2
Taku Sugita, Yusuke Kondo, Seigo Ishino, Ikuo Mori, Takashi Horiguchi, Mikako Ogawa, Yasuhiro Magata
OBJECTIVES: The purpose of this study is the development of novel fluorine-18-fluorodeoxyglucose (F-FDG)-PET and Tc-hexamethylpropylene amine oxime (HMPAO) SPECT methods with free-moving apparatus on conscious rats to investigate brain activity without the effects of anesthesia and tactual stimulation. We also assessed the sensitivity of the experimental system by an intervention study using fluoxetine as a reference drug. MATERIALS AND METHODS: A catheter was inserted into the femoral vein and connected to a free-moving cannula system...
May 15, 2018: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/29744803/prediction-of-future-weight-change-with-the-dopamine-transporter
#3
Kyoungjune Pak, Keunyoung Kim, Myung Jun Lee, Jae Meen Lee, Bum Soo Kim, Seong-Jang Kim, In Joo Kim
The brain plays a critical role in controlling and inhibiting pre-potent responses to foods. We investigated the predictive value of dopamine transporter (DAT) availability in the striatum of healthy subjects using 123 I-FP-CIT single-photon emission computed tomography (SPECT). In total, 84 participants with available data on their weight for the 60 months after SPECT were included. Specific binding of 123 I-FP-CIT to DAT was calculated using region-of-interest analysis, and the putamen-to-caudate nucleus ratio (PCR) was determined...
May 9, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29736562/evaluation-of-brain-nuclear-medicine-imaging-tracers-in-a-murine-model-of-sepsis-associated-encephalopathy
#4
Dávid Szöllősi, Nikolett Hegedűs, Dániel S Veres, Ildikó Futó, Ildikó Horváth, Noémi Kovács, Bernadett Martinecz, Ádám Dénes, Daniel Seifert, Ralf Bergmann, Ondřej Lebeda, Zoltán Varga, Zoltán Kaleta, Krisztián Szigeti, Domokos Máthé
PURPOSE: The purpose of this study was to evaluate a set of widely used nuclear medicine imaging agents as possible methods to study the early effects of systemic inflammation on the living brain in a mouse model of sepsis-associated encephalopathy (SAE). The lipopolysaccharide (LPS)-induced murine systemic inflammation model was selected as a model of SAE. PROCEDURES: C57BL/6 mice were used. A multimodal imaging protocol was carried out on each animal 4 h following the intravenous administration of LPS using the following tracers: [99m Tc][2,2-dimethyl-3-[(3E)-3-oxidoiminobutan-2-yl]azanidylpropyl]-[(3E)-3-hydroxyiminobutan-2-yl]azanide ([99m Tc]HMPAO) and ethyl-7-[125 I]iodo-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate ([125 I]iomazenil) to measure brain perfusion and neuronal damage, respectively; 2-deoxy-2-[18 F]fluoro-D-glucose ([18 F]FDG) to measure cerebral glucose uptake...
May 7, 2018: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/29734479/task-based-design-of-a-synthetic-collimator-spect-system-used-for-small-animal-imaging
#5
Alexander Lin, Matthew A Kupinski, Todd E Peterson, Sepideh Shokouh, Lindsay C Johnson
PURPOSE: In traditional multi-pinhole SPECT systems, image multiplexing - the overlapping of pinhole projection images - may occur on the detector, which can inhibit quality image re-constructions due to photon-origin uncertainty. One proposed system to mitigate the effects of multiplexing is the synthetic-collimator SPECT system. In this system, two detectors, a silicon detector and a germanium detector, are placed at different distances behind the multi-pinhole aperture, allowing for image detection to occur at different magnifications and photon energies, resulting in higher overall sensitivity while maintaining high resolution...
May 7, 2018: Medical Physics
https://www.readbyqxmd.com/read/29723641/contributions-of-dopaminergic-and-non-dopaminergic-neurons-to-vta-stimulation-induced-neurovascular-responses-in-brain-reward-circuits
#6
Marta Brocka, Cornelia Helbing, Daniel Vincenz, Thomas Scherf, Dirk Montag, Jürgen Goldschmidt, Frank Angenstein, Michael Lippert
Mapping the activity of the human mesolimbic dopamine system by BOLD-fMRI is a tempting approach to non-invasively study the action of the brain reward system during different experimental conditions. However, the contribution of dopamine release to the BOLD signal is disputed. To assign the actual contribution of dopaminergic and non-dopaminergic VTA neurons to the formation of BOLD responses in target regions of the mesolimbic system, we used two optogenetic approaches in rats. We either activated VTA dopaminergic neurons selectively, or dopaminergic and mainly glutamatergic projecting neurons together...
April 30, 2018: NeuroImage
https://www.readbyqxmd.com/read/29723640/dual-radiotracer-translational-spect-neuroimaging-comparison-of-three-methods-for-the-simultaneous-brain-imaging-of-d-2-3-and-5-ht-2a-receptors
#7
Stergios Tsartsalis, Benjamin B Tournier, Selim Habiby, Meriem Ben Hamadi, Cristina Barca, Nathalie Ginovart, Philippe Millet
PURPOSE: SPECT imaging with two radiotracers at the same time is feasible if two different radioisotopes are employed, given their distinct energy emission spectra. In the case of 123 I and 125 I, dual SPECT imaging is not straightforward: 123 I emits photons at a principal energy emission spectrum of 143.1-179.9 keV. However, it also emits at a secondary energy spectrum (15-45 keV) that overlaps with the one of 125 I and the resulting cross-talk of emissions impedes the accurate quantification of 125 I...
April 30, 2018: NeuroImage
https://www.readbyqxmd.com/read/29720959/role-of-neuroimaging-as-a-biomarker-for-neurodegenerative-diseases
#8
REVIEW
Soichiro Shimizu, Daisuke Hirose, Hirokuni Hatanaka, Naoto Takenoshita, Yoshitsugu Kaneko, Yusuke Ogawa, Hirofumi Sakurai, Haruo Hanyu
It has recently been recognized that neurodegenerative diseases are caused by common cellular and molecular mechanisms including protein aggregation and inclusion body formation. Each type of neurodegenerative disease is characterized by the specific protein that aggregates. In these days, the pathway involved in protein aggregation has been elucidated. These are leading to approaches toward disease-modifying therapies. Neurodegenerative diseases are fundamentally diagnosed pathologically. Therefore, autopsy is essential for a definitive diagnosis of a neurodegenerative disease...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29700797/quantitation-of-specific-binding-ratio-in-123-i-fp-cit-spect-accurate-processing-strategy-for-cerebral-ventricular-enlargement-with-use-of-3d-striatal-digital-brain-phantom
#9
Akihiro Furuta, Hideo Onishi, Hizuru Amijima
This study aimed to evaluate the effect of ventricular enlargement on the specific binding ratio (SBR) and to validate the cerebrospinal fluid (CSF)-Mask algorithm for quantitative SBR assessment of 123 I-FP-CIT single-photon emission computed tomography (SPECT) images with the use of a 3D-striatum digital brain (SDB) phantom. Ventricular enlargement was simulated by three-dimensional extensions in a 3D-SDB phantom comprising segments representing the striatum, ventricle, brain parenchyma, and skull bone. The Evans Index (EI) was measured in 3D-SDB phantom images of an enlarged ventricle...
April 26, 2018: Radiological Physics and Technology
https://www.readbyqxmd.com/read/29698545/the-role-of-molecular-imaging-in-assessing-degenerative-parkinsonism-an-updated-review
#10
Nicolas Nicastro, Valentina Garibotto, Pierre R Burkhard
Diagnosing degenerative forms of parkinsonism still relies on a thorough clinical assessment, which in Parkinson's disease involves the presence of an asymmetric bradykinesia with rest tremor and/or rigidity that respond substantially to levodopa. Conversely, atypical forms, including multiple system atrophy, progressive supranuclear palsy and corticobasal degeneration, exhibit additional features (cerebellar or pyramidal signs, early postural instability), a poor response to dopamine replacement therapy and a bad prognosis...
April 26, 2018: Swiss Medical Weekly
https://www.readbyqxmd.com/read/29694338/cerebral-hypoperfusion-in-autism-spectrum-disorder
#11
Geir Bjørklund, Janet K Kern, Mauricio A Urbina, Khaled Saad, Amira A El-Houfey, David A Geier, Salvatore Chirumbolo, Mark R Geier, Jyutika A Mehta, Jan Aaseth
Cerebral hypoperfusion, or insufficient blood flow in the brain, occurs in many areas of the brain in patients diagnosed with autism spectrum disorder (ASD). Hypoperfusion was demonstrated in the brains of individuals with ASD when compared to normal healthy control brains either using positron emission tomography (PET) or single‑photon emission computed tomography (SPECT). The affected areas include, but are not limited to the: prefrontal, frontal, temporal, occipital, and parietal cortices; thalami; basal ganglia; cingulate cortex; caudate nucleus; the limbic system including the hippocampal area; putamen; substantia nigra; cerebellum; and associative cortices...
2018: Acta Neurobiologiae Experimentalis
https://www.readbyqxmd.com/read/29684537/genetic-imaging-study-with-tc-99m-trodat-1-spect-in-adolescents-with-adhd-using-oros-methylphenidate
#12
Aynur Pekcanlar Akay, Gamze Çapa Kaya, Samet Kose, Çiğdem Eresen Yazıcıoğlu, Handan Özek Erkuran, Sevay Alşen Güney, Kaya Oğuz, Duygu Keskin, Burak Baykara, Neslihan İnal Emiroğlu, Mine Şencan Eren, Sefa Kızıldağ, Türkan Ertay, Dua Özsoylu, Süha Miral, Hatice Durak, Ali Saffet Gönül, Luis Augusto Rohde
AIM: To examine theeffects on the brain of 2-month treatment withamethylphenidate extended-release formulation (OROS-MPH) using [Tc-99m ] TRODAT-1SPECT in a sample of treatment-naïve adolescents with Attention Deficit/Hyperactivity Disorder (ADHD). In addition, to assess whether risk alleles (homozygosity for 10-repeat allele at the DAT1 gene were associated with alterations in striatal DAT availability. METHODS: Twenty adolescents with ADHD underwent brain single-photon emission computed tomography (SPECT) scans with [Tc-99m ] TRODAT-1 at baseline and two months after starting OROS-MPH treatment with dosages up to 1 mg/kg/day...
April 20, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29665789/idiopathic-basal-ganglia-calcification-associated-with-cerebral-micro-infarcts-a-case-report
#13
Takuma Nishimoto, Fumiaki Oka, Hideyuki Ishihara, Mizuya Shinoyama, Michiyasu Suzuki
BACKGROUND: Idiopathic basal ganglia calcification (IBGC) is a rare neurodegenerative disorder characterized by symmetric intracranial calcium deposition. We report a patient with IBGC associated with cerebral infarction due to impairment of cerebrovascular reactivity based on single-photon emission computed tomography (SPECT) with acetazolamide challenge. CASE PRESENTATION: A 66-year-old male presented with right conjugate deviation, right hemiparesis and total aphasia due to a convulsive seizure...
April 17, 2018: BMC Neurology
https://www.readbyqxmd.com/read/29627772/altered-cerebral-blood-flow-in-the-anterior-cingulate-cortex-is-associated-with-neuropathic-pain
#14
Keisuke Watanabe, Shigeki Hirano, Kazuho Kojima, Kengo Nagashima, Hiroki Mukai, Takatoshi Sato, Minoru Takemoto, Koji Matsumoto, Takashi Iimori, Sagiri Isose, Shigeki Omori, Kazumoto Shibuya, Yukari Sekiguchi, Minako Beppu, Hiroshi Amino, Tomoki Suichi, Koutaro Yokote, Takashi Uno, Satoshi Kuwabara, Sonoko Misawa
OBJECTIVE: To assess the cerebral blood flow (CBF) in patients with diabetic neuropathic pain, and its changes after duloxetine therapy. METHODS: Using iodine-123-N-isopropyl-p-iodoamphetamine single-photon emission computed tomography (IMP-SPECT), we performed a cross-sectional study of 44 patients with diabetes, and compared CBF in those with (n = 24) and without neuropathic pain (n = 20). In patients with neuropathic pain, we also longitudinally assessed changes in CBF 3 months after treatment with duloxetine...
April 7, 2018: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/29616518/coronary-artery-bypass-surgery-in-patients-with-chronic-brain-hypoperfusion
#15
Hajime Imura, Yuji Maruyama, Kenichiro Takahashi, Dai Nishina, Takashi Nitta
BACKGROUND: Cerebrovascular disease (CVD) is a risk factor of stroke and cerebral hypoperfusion is one of the underlying mechanisms. We hypothesized that coronary artery bypass grafting (CABG) can be performed at an acceptable risk for such patients without concomitant surgery for CVD. METHODS: Carotid echo was carried out for 538 consecutive patients undergoing isolated CABG between 2005 and 2016. Magnetic resonance image/angiography (MRI/A) for neck and brain was performed for 288 patients (stenosis≥50% in echo were basically included)...
April 3, 2018: Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/29607917/-cadasil-with-cysteine-sparing-notch3-mutation-manifesting-as-dissociated-progression-between-cognitive-impairment-and-brain-image-findings-in-3-years-a-case-report
#16
Keisuke Tachiyama, Yuji Shiga, Yutaka Shimoe, Ikuko Mizuta, Toshiki Mizuno, Masaru Kuriyama
A 55-year-old man with no history of stroke or migraine presented to the clinic with cognitive impairment and depression that had been experiencing for two years. Neurological examination showed bilateral pyramidal signs, and impairments in cognition and attention. Brain MRI revealed multiple lacunar lesions and microbleeds in the deep cerebral white matter, subcortical regions, and brainstem, as well as diffuse white matter hyperintensities without anterior temporal pole involvement. Cerebral single-photon emission computed tomography (SPECT) revealed bilateral hypoperfusion in the basal ganglia...
March 31, 2018: Rinshō Shinkeigaku, Clinical Neurology
https://www.readbyqxmd.com/read/29605630/-99m-tc-hmpao-brain-spect-in-the-monitoring-of-cerebral-vasculitis-therapy
#17
V Frantellizzi, M Morreale, M Pontico, A Francia, F M Drudi, A Farcomeni, M Liberatore
OBJECTIVE: The central nervous system (CNS) may be involved in a variety of inflammatory diseases of the blood vessels, generally known as vasculitis. The clinical diagnosis of such involvement in early stages is difficult, since a mild cognitive impairment can be the only symptom. It was hypothesized that brain-perfusion SPECT would be able to reveal CNS involvement and to monitor the course of the disease. The purpose of this study was assess if and when an improvement of cerebral perfusion can be registered by SPECT during the follow-up of these diseases...
March 28, 2018: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/29593508/gabaergic-control-of-nigrostriatal-and-mesolimbic-dopamine-in-the-rat-brain
#18
Susanne Nikolaus, Hans-Jörg Wittsack, Markus Beu, Christina Antke, Maria A De Souza Silva, Frijthof Wickrath, Anja Müller-Lutz, Joseph P Huston, Gerald Antoch, Hans-Wilhelm Müller, Hubertus Hautzel
Purpose: The present study assessed the effects of the GABAA receptor (R) agonist muscimol (MUS), and the GABAA R antagonist bicuculline (BIC) on neocortical and subcortical radioligand binding to dopamine D2/3 Rs in relation to motor and exploratory behaviors in the rat. Methods: D2/3 R binding was measured with small animal SPECT in baseline and after challenge with either 1 mg/kg MUS or 1 mg/kg BIC, using [123 I]IBZM as radioligand. Motor/exploratory behaviors were assessed for 30 min in an open field prior to radioligand administration...
2018: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29588240/superficial-temporal-artery-superior-cerebellar-artery-bypass-with-anterior-petrosectomy-technical-case-report
#19
Masaaki Hokari, Katsuyuki Asaoka, Daisuke Shimbo, Kazuki Uchida, Koji Itamoto
BACKGROUND: Superficial temporal artery (STA) -to- superior cerebellar artery (SCA) bypass is associated with a relatively high risk of surgical complications, such as hematoma and/or edema caused by temporal lobe retraction. Therefore, the right side is typically used to avoid retraction of the left temporal lobe. In this report, we present a case of left STA-SCA bypass with anterior petrosectomy to avoid retraction of dominant side temporal lobe and describe the surgical technique in detail...
March 24, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29580057/design-synthesis-and-preliminary-evaluation-of-spect-probes-for-imaging-%C3%AE-amyloid-in-alzheimer-s-disease-affected-brain
#20
Yuki Okumura, Yoshifumi Maya, Takako Onishi, Yoshinari Shoyama, Akihiro Izawa, Daisaku Nakamura, Shigeyuki Tanifuji, Akihiro Tanaka, Yasushi Arano, Hiroki Matsumoto
In this study, we synthesized of a series of 2-phenyl- and 2-pyridyl-imidazo[1,2-a]pyridine derivatives and examine their suitability as novel probes for single-photon emission computed tomography (SPECT)-based imaging of β-amyloid (Aβ). Among the 11 evaluated compounds, 10 showed moderate affinity to Aβ(1-42) aggregates, exhibiting half-maximal inhibitory concentrations (IC50) of 14.7 ± 6.07-87.6 ± 39.8 nM. In vitro autoradiography indicated that 123I-labeled triazole-substituted derivatives displayed highly selective binding to Aβ plaques in the hippocampal region of Alzheimer's disease (AD)-affected brain...
March 27, 2018: ACS Chemical Neuroscience
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