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Tobias Bexelius, Antti Sohlberg
OBJECTIVE: Statistical SPECT reconstruction can be very time-consuming especially when compensations for collimator and detector response, attenuation, and scatter are included in the reconstruction. This work proposes an accelerated SPECT reconstruction algorithm based on graphics processing unit (GPU) processing. METHODS: Ordered subset expectation maximization (OSEM) algorithm with CT-based attenuation modelling, depth-dependent Gaussian convolution-based collimator-detector response modelling, and Monte Carlo-based scatter compensation was implemented using OpenCL...
March 21, 2018: Annals of Nuclear Medicine
Jinming Li, Yuan Yang, Yuankai Zhu, Liqiang Zhou, Yunfeng Han, Tao Yin, Zhaoting Cheng, Guopeng Zhang, Yanxia Shen, Jing Chen
BACKGROUND: Major depressive disorder (MDD) is a common mental disorder worldwide, but now there is a lack of clinically effective assessment and management of MDD. In this study, we used technetium-99 m ethylcysteinate dimer ([99m Tc]ECD) SPECT/CT to characterize the regional cerebral blood flow (rCBF) status of MDD patients, and to explore an objective image assessment model of MDD which is non- or minimally-invasive, convenient and accurate in a clinical setting. METHODS: The severity of MDD was assessed by three trained psychiatrists, based on scores obtained from HAMD and HAMA...
March 21, 2018: BMC Psychiatry
Jessa E Miller, Neal C Al-Attar, Owen H Brown, Gabrielle G Shaughness, Natalja P Rosculet, Anca Avram, David T Hughes
BACKGROUND: After initial surgical treatment of differentiated thyroid cancer (DTC) residual lymph node metastases are often found at the time of radioactive iodine (131-I) therapy. Recurrence of DTC is due to persistent disease not removed at initial surgery and that did not respond to 131-I treatment. This study aims to determine locations of, and reasons for, residual nodal metastases detected by 131-I scans with SPECT/CT obtained prior to radioiodine therapy following surgical treatment of DTC...
March 21, 2018: Thyroid: Official Journal of the American Thyroid Association
Kathrin Kettenbach, Laura M Reffert, Hanno Schieferstein, Stefanie Pektor, Raphael Eckert, Matthias Miederer, Frank Rösch, Tobias L Ross
Within the last decade, several folate-based radiopharmaceuticals for Single Photon Emission Computed Tomography (SPECT) and Positron Emission Tomography (PET) have been evaluated; however, there is still a lack of suitable18 F-folates for clinical PET imaging. Herein, we report the synthesis and evaluation of two novel18 F-folates employing strain-promoted and copper-catalyzed click chemistry. Furthermore, the influence of both click-methods on lipophilicity and pharmacokinetics of the18 F-folates was investigated...
March 17, 2018: Pharmaceuticals
Bastien Gregoire, Géraldine Pina-Jomir, Alexandre Bani-Sadr, Caroline Moreau-Triby, Marc Janier, Christian Scheiber
PURPOSE: The aim of this study was to determine the minimum acquisition time without decreasing lesion detectability of bone SPECT using a whole-body cadmium-zinc-telluride camera. METHODS: Patients referred for bone SPECT were retrospectively included. SPECT of 30 patients were reframed from native data (16 s/projection) to produce 10-, 5-, and 3-s/projection data sets. A "critical" acquisition time/projection was defined as that below which the SPECT quality becomes insufficient for interpretation, as determined by 3 reviewers using a 4-point scale (0 = quality insufficient for interpretation, 1 = average, 2 = good, 3 = excellent)...
March 20, 2018: Clinical Nuclear Medicine
Saima Riaz, Humayun Bashir, Imran Khalid Niazi, Sumera Butt, Faisal Qamar
Mirels' scoring system quantifies the risk of sustaining a pathologic fracture in osseous metastases of weight bearing long bones. Conventional Mirels' scoring is based on radiographs. Our pilot study proposes Tc MDP bone SPECT-CT based modified Mirels' scoring system and its comparison with conventional Mirels' scoring. Cortical lysis was noted in 8(24%) by SPECT-CT versus 2 (6.3%) on X-rays. Additional SPECT-CT parameters were; circumferential involvement [1/4 (31%), 1/2 (3%), 3/4 (37.5%), 4/4 (28%)] and extra-osseous soft tissue [3%]...
March 20, 2018: Clinical Nuclear Medicine
Vincent Manceau, Xavier Palard, Yan Rolland, March Pracht, Samuel Le Sourd, Sophie Laffont, Karim Boudjema, Astride Lievre, Habiba Mesbah, Laure-Anne Haumont, Laurence Lenoir, Vanessa Brun, Thomas Uguen, Julien Edeline, Etienne Garin
PURPOSE: Selective internal radiation therapy (SIRT) appears to be an interesting treatment possibility for locally-advanced intrahepatic cholangiocarcinoma (ICC), yet the appropriate dosimetry has never been evaluated in this context. METHODS: We retrospectively studied data from 40 patients treated at our institution with90 Y-loaded glass microsphere SIRT combined with chemotherapy for inoperable ICC as first-line treatment. Macroaggregated albumin (MAA)-based single-photon emission computed tomography (SPECT)/computed tomography (CT) quantitative analysis was used to calculate the tumor dose (TD), healthy-injected liver dose (HILD), and injected liver dose (ILD)...
March 20, 2018: European Journal of Nuclear Medicine and Molecular Imaging
Youngsin Jung, Lennon G Jordan, Val J Lowe, Kejal Kantarci, Joseph E Parisi, Dennis W Dickson, Melissa E Murray, Ross R Reichard, Tanis J Ferman, David T Jones, Jonathan Graff-Radford, Rodolfo Savica, Mary M Machulda, Julie A Fields, Laura A Allen, Daniel A Drubach, Erik K St Louis, Michael H Silber, Clifford R Jack, David S Knopman, Ronald C Petersen, Bradley F Boeve
The relationship between clinicopathologic diagnosis and123 I-FP-CIT SPECT in 18 patients with dementia (12 with Lewy body disease) from one center in the United States was assessed. The sensitivity and specificity of abnormal123 I-FP-CIT SPECT with reduced striatal uptake on visual inspection for predicting Lewy body disease were 91.7% and 83.3%, respectively. The mean calculated putamen to occipital ratio (mPOR) based on regions of interest was significantly reduced in Lewy body disease compared to non-Lewy body disease cases ( P = 0...
March 2018: Annals of Clinical and Translational Neurology
Deok Su Sin, Myoung Hyoun Kim, Soon-Ah Park, Min Cheol Joo, Min Su Kim
Objective: The purpose of this study is to investigate predictors of crossed cerebellar diaschisis (CCD), and the effects of CCD on functional outcomes including motor function, activities of daily living, cognitive function, and ambulation 6 months after onset in patients with intracerebral hemorrhage (ICH). Methods: A total of 74 patients experiencing their first ICH were recruited. If the asymmetric index was more than 10% using single photon emission computed tomography (SPECT), a diagnosis of CCD was confirmed...
February 2018: Annals of Rehabilitation Medicine
Geor Bakker, Claudia Vingerhoets, Daphne Boucherie, Matthan Caan, Oswald Bloemen, Jos Eersels, Jan Booij, Thérèse van Amelsvoort
Background: It is still unclear which underlying mechanisms are involved in cognitive deficits of psychotic disorders. Pro-cognitive effects of muscarinic M1 receptor agonists suggest alterations in M1 receptor functioning may modulate these symptoms. Post mortem studies in patients with schizophrenia have shown significantly reduced M1 receptor expression rates in the dorsolateral prefrontal cortex (DLPFC) compared to controls. To date no in-vivo examinations of M1 receptor binding in relation to cognitive impairments have been done...
2018: NeuroImage: Clinical
Masato Kasagi, Tomokazu Motegi, Kosuke Narita, Kazuyuki Fujihara, Yusuke Suzuki, Minami Tagawa, Koichi Ujita, Hirotaka Shimada, Masato Fukuda
BACKGROUND: Although recent studies have suggested that the γ-aminobutyric acid type A (GABAA) receptor binding affinity can be a more sensitive marker of age-related neuronal loss than regional gray matter (GM) volume, knowledge about the relationship between decreased GABAA receptor binding affinity and cognitive decline during normal aging is still limited. METHODS: Thirty-seven healthy elderly individuals (aged 50-77 years (mean, 64.5 ± 7.3 years); 15 males and 22 females) were enrolled in this study...
March 21, 2018: International Psychogeriatrics
Ingrid L Bakker, Sandra T van Tiel, Joost Haeck, Gabriela N Doeswijk, Erik de Blois, Marcel Segbers, Theodosia Maina, Berthold A Nock, Marion de Jong, Simone U Dalm
PURPOSE: The gastrin-releasing peptide receptor (GRPR), overexpressed on various tumor types, is an attractive target for receptor-mediated imaging and therapy. Another interesting approach would be the use of GRPR radioligands for pre-operative imaging and subsequent radio-guided surgery, with the goal to improve surgical outcome. GRPR radioligands were successfully implemented in clinical studies, especially Sarabesin 3 (SB3) is an appealing GRPR antagonist with high receptor affinity...
March 19, 2018: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
Yoshitaka Inui, Takashi Ichihara, Masaki Uno, Masanobu Ishiguro, Kengo Ito, Katsuhiko Kato, Hajime Sakuma, Hidehiko Okazawa, Hiroshi Toyama
OBJECTIVE: Statistical image analysis of brain SPECT images has improved diagnostic accuracy for brain disorders. However, the results of statistical analysis vary depending on the institution even when they use a common normal database (NDB), due to different intrinsic spatial resolutions or correction methods. The present study aimed to evaluate the correction of spatial resolution differences between equipment and examine the differences in skull bone attenuation to construct a common NDB for use in multicenter settings...
March 19, 2018: Annals of Nuclear Medicine
Arthur E Stillman, Matthijs Oudkerk, David A Bluemke, Menko Jan de Boer, Jens Bremerich, Ernest V Garcia, Matthias Gutbertlet, Pim van der Harst, W Gregory Hundley, Michael Jerosch-Herold, Dirkjan Kuijpers, Raymond Y Kwong, Eike Nagel, Stamatios Lerakis, John Oshinski, Jean-François Paul, Riemer H J A Slart, Vinod Thourani, Rozemarijn Vliegenthart, Bernd J Wintersperger
Non-invasive imaging plays a growing role in the diagnosis and management of ischemic heart disease from its earliest manifestations of endothelial dysfunction to myocardial infarction along the myocardial ischemic cascade. Experts representing the North American Society for Cardiovascular Imaging and the European Society of Cardiac Radiology have worked together to organize the role of non-invasive imaging along the framework of the ischemic cascade. The current status of non-invasive imaging for ischemic heart disease is reviewed along with the role of imaging for guiding surgical planning...
March 19, 2018: International Journal of Cardiovascular Imaging
Ramin Mandegaran, Kanhaiyalal Agrawal, Sanjay Vijayanathan, Gopinath Gnanasegaran
OBJECTIVE: The purpose of this study was to assess the incremental value of technetium-99m-methyl diphosphonate (Tc-MDP) single-photon emission computed tomography/computed tomography (SPECT/CT) over Tc-MDP two-phase bone scan (TPBS) in the assessment of the patients with pain following knee arthroplasty. PATIENTS AND METHODS: Tc-MDP TPBS and Tc-MDP SPECT/CT were performed in 49 patients with knee pain after knee arthroplasty. The scans were reviewed by two readers (nuclear medicine physician and musculoskeletal radiologist)...
March 16, 2018: Nuclear Medicine Communications
Aida Niñerola-Baizán, Judith Gallego, Albert Cot, Pablo Aguiar, Francisco Lomeña, Javier Pavía, Domenec Ros
The aim of this work was to obtain a set of parameters to be applied in [123I]FP-CIT SPECT reconstruction in order to minimize the error between standardized and true values of the Specific Uptake Ratio (SUR) in dopaminergic neurotransmission SPECT studies. To this end, Monte Carlo simulation was used to generate a database of 1,380 projection data-sets from 23 subjects, including normal cases and a variety of pathologies. Studies were reconstructed using Filtered Back Projection (FBP) with attenuation correction and Ordered Subset Expectation Maximization (OSEM) with correction for different degradations (attenuation, scatter and PSF)...
March 19, 2018: Physics in Medicine and Biology
Julian Betancur, Frederic Commandeur, Mahsaw Motlagh, Tali Sharir, Andrew J Einstein, Sabahat Bokhari, Mathews B Fish, Terrence D Ruddy, Philipp Kaufmann, Albert J Sinusas, Edward J Miller, Timothy M Bateman, Sharmila Dorbala, Marcelo Di Carli, Guido Germano, Yuka Otaki, Balaji K Tamarappoo, Damini Dey, Daniel S Berman, Piotr J Slomka
OBJECTIVES: The study evaluated the automatic prediction of obstructive disease from myocardial perfusion imaging (MPI) by deep learning as compared with total perfusion deficit (TPD). BACKGROUND: Deep convolutional neural networks trained with a large multicenter population may provide improved prediction of per-patient and per-vessel coronary artery disease from single-photon emission computed tomography MPI. METHODS: A total of 1,638 patients (67% men) without known coronary artery disease, undergoing stress99m Tc-sestamibi or tetrofosmin MPI with new generation solid-state scanners in 9 different sites, with invasive coronary angiography performed within 6 months of MPI, were studied...
March 12, 2018: JACC. Cardiovascular Imaging
Fuat Arikan, Marta Rubiera, Joaquín Serena, Ana Rodríguez-Hernández, Darío Gándara, Carles Lorenzo-Bosquet, Alejandro Tomasello, Ivette Chocrón, Maximiliano Quintana-Corvalan, Juan Sahuquillo
INTRODUCTION: Cerebral revascularization techniques are an indispensable tool in the current armamentarium of vascular neurosurgeons. We present revascularization surgery experience and results in both moyamoya disease and occlusive cerebral ischaemia. PATIENTS AND METHODS: Patients with ischaemic occlusive disease and moyamoya disease who underwent microsurgical revascularization between October 2014 and September 2017 were analysed. RESULTS: In the study period, 23 patients with occlusive ischaemic disease underwent microsurgical revascularization...
March 14, 2018: Neurocirugía
Rumiko Takayama, Katsumi Imai, Hiroko Ikeda, Koichi Baba, Naotaka Usui, Yukitoshi Takahashi, Yushi Inoue
We describe two cases of refractory epilepsy with cerebral hemiatrophy and contralateral electroencephalographic (EEG) abnormalities, in which hemispherotomy of the atrophic hemisphere effectively controlled seizures. Case 1 was a 5-year-1-month-old girl with refractory bilateral asymmetrical tonic posturing seizures predominantly in the right arm. Magnetic resonance imaging showed left porencephaly corresponding to a left middle cerebral artery infarction. Case 2 was a 3-year-8-month-old boy with refractory bilateral asymmetrical tonic posturing seizures predominantly in the right arm due to atrophy of the left cerebral hemisphere after septic meningitis...
March 14, 2018: Brain & Development
Marko Barjaktarović, Milica M Janković, Marija Jeremić, Milovan Matović
Radioiodine therapy in the treatment of differentiated thyroid carcinoma (DTC) is used in clinical practice for the ablation of thyroid residues and/or destruction of tumour tissue. Whole-body scintigraphy for visualization of the spatial 131I distribution performed by a gamma camera (GC) is a standard procedure in DTC patients after application of radioiodine therapy. A common problem is the precise topographic localization of regions where radioiodine is accumulated even in SPECT imaging. SPECT/CT can provide precise topographic localization of regions where radioiodine is accumulated, but it is often unavailable, especially in developing countries because of the high price of the equipment...
March 9, 2018: Computers in Biology and Medicine
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