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https://www.readbyqxmd.com/read/28428888/multimodal-imaging-findings-in-an-adult-case-of-swyer-james-macleod-syndrome
#1
Hitoshi Kawasuji, Kensuke Suzuki, Hideaki Furuse, Takeshi Tsuda, Yasuaki Masaki, Hirokazu Taniguchi
Swyer-James-MacLeod syndrome (SJMS) is an uncommon obliterative lung disease that is radiologically characterized by hyperlucency of a part of or the entire lung. A 33-year-old man presented to our hospital for chest tightness. A chest X-ray revealed unilateral hyperlucency of left lower lung, and contrast-enhanced computed tomography (CT) of the chest disclosed a hyperlucent left lung without vascularity. Three-dimensional CT reconstruction and ventilation-perfusion scan findings were concordant with SJMS...
July 2017: Respirology Case Reports
https://www.readbyqxmd.com/read/28427220/multiparametric-imaging-using-18f-fdg-pet-ct-heterogeneity-parameters-and-functional-mri-techniques-prognostic-significance-in-patients-with-primary-advanced-oropharyngeal-or-hypopharyngeal-squamous-cell-carcinoma-treated-with-chemoradiotherapy
#2
Sheng-Chieh Chan, Nai-Ming Cheng, Chia-Hsun Hsieh, Shu-Hang Ng, Chien-Yu Lin, Tzu-Chen Yen, Cheng-Lung Hsu, Hung-Ming Wan, Chun-Ta Liao, Kai-Ping Chang, Jiun-Jie Wang
BACKGROUND: In this study, PET heterogeneity was combined with functional MRI techniques to refine the prediction of prognosis in patients with oropharyngeal or hypopharyngeal squamous cell carcinoma (OHSCC). METHODS: A total of 124 patients with primary advanced OHSCC who underwent pretreatment 18F-FDG PET/CT, dynamic contrast-enhanced MR imaging (DCE-MRI), and diffusion-weighted MR imaging (DWI) were enrolled. Conventional and heterogeneity parameters from 18F-FDG PET as well as perfusion parameters from DCE-MRI and diffusion parameter from DWI of primary tumors were analyzed in relation to recurrence-free survival (RFS) and overall survival (OS)...
March 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28427081/choroidal-thickness-and-microperimetry-sensitivity-in-age-related-macular-degeneration
#3
Geoffrey K Broadhead, Thomas Hong, Peter McCluskey, John R Grigg, Timothy E Schlub, Andrew A Chang
PURPOSE: To assess choroidal thickness (CT) and its relationship to retinal sensitivity in mild/moderate age-related macular degeneration (AMD). METHODS: Seventy-two eyes of 51 participants with mild/moderate AMD and 36 eyes of 18 age-matched normal participants were prospectively recruited to undergo enhanced-depth imaging optical coherence tomography (EDI-OCT) imaging and microperimetry (MP) functional assessment. OCT-measured CT and retinal thickness (RT) were matched with MP sensitivity at 13 retinal loci, and correlations were analysed...
April 21, 2017: Ophthalmic Research
https://www.readbyqxmd.com/read/28419949/characteristics-of-seizure-induced-signal-changes-on-mri-in-patients-with-first-seizures
#4
Si Eun Kim, Byung In Lee, Kyong Jin Shin, Sam Yeol Ha, JinSe Park, Kang Min Park, Hyung Chan Kim, Joonwon Lee, Soo-Young Bae, Dongah Lee, Sung Eun Kim
PURPOSE: The aim of this study was to investigate the predictive factors and identify the characteristics of the seizure-induced signal changes on MRI (SCM) in patients with first seizures. METHODS: We conducted a retrospective study of patients with first seizures from March 2010 to August 2014. The inclusion criteria for this study were patients with 1) first seizures, and 2) MRI and EEG performed within 24h of the first seizures. The definition of SCM was hyper-intensities in the brain not applying to cerebral arterial territories...
April 11, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28419614/prospective-comparison-of-biphasic-contrast-enhanced-ct-volume-perfusion-ct-and-3-tesla-mri-with-diffusion-weighted-imaging-for-insulinoma-detection
#5
Liang Zhu, Huadan Xue, Zhaoyong Sun, Ping Li, Tianyi Qian, Xiaoping Xing, Naishi Li, Yupei Zhao, Wenming Wu, Zhengyu Jin
PURPOSE: To evaluate the diagnostic performance of biphasic contrast-enhanced CT (CECT), volume perfusion CT (VPCT) and 3 Tesla MRI with diffusion-weighted imaging (DWI), in patients with clinically suspected insulinomas. MATERIALS AND METHODS: This prospective study was approved by the institutional review board. Sixty-four patients with clinically suspected insulinomas underwent biphasic CECT, VPCT, and 3T MR with DWI. Two radiologists independently determined the presence/absence of tumor using a 5-scale confidence level...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28418953/pulmonary-perfusion-scan-mimicking-hepatobiliary-scintigraphy-in-a-patient-with-an-uncommon-manifestation-of-granulomatosis-with-polyangiitis
#6
Michelle D Hopstone, Evan A Raff, Patrick M Colletti
A 36-year-old man with known granulomatosis with polyangiitis underwent quantitative ventilation-perfusion pulmonary scintigraphy as part of an initial evaluation for lung transplant candidacy. Radiotracer uptake on the perfusion study has the appearance of the hepatic silhouette, drawing initial concern that there may have been a misadministration of Tc with a hepatobiliary agent. Comparison CT reveals extensive cystic bronchiectasis, parenchymal destruction, and volume loss involving the entire left lung and basal portions of the right lung, with the residual portions of functional lung parenchyma conforming to a shape similar to the liver...
April 17, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28416358/non-gated-high-pitch-computed-tomography-aortic-angiography-myocardial-perfusion-defects-in-patients-with-suspected-aortic-dissection
#7
Li-Ting Huang, Shih-Hung Chan, Chia-Chang Chuang, Yi-Shan Tsai
OBJECTIVES: To investigate the diagnostic value of first-pass myocardial perfusion defects visualised in non-gated high-pitch computed tomography angiography (CTA) in patients admitted to the emergency department (ED) for suspected aortic dissection. METHODS: We recruited 174 ED patients who underwent high-pitch CTA of the aorta because of suspected aortic dissection. We divided these patients into two groups (diseased and control groups) based on whether their clinical data fulfilled the third universal definition of acute myocardial infarction (AMI), specifically an increase in cardiac troponin (cTn) with at least one of the following: (a) symptoms of ischemia; (b) new ST-segment-T wave (ST-T) changes or new left bundle branch block (LBBB); (c) development of pathological Q wave; (d) new loss of viable myocardium or new regional wall motion abnormality; or (e) identification of an intracoronary thrombus by angiography or autopsy...
April 12, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28414895/the-impact-of-ct-perfusion-threshold-on-predicted-viable-and-nonviable-tissue-volumes-in-acute-ischemic-stroke
#8
Xuya Huang, Dheeraj Kalladka, Bharath Kumar Cheripelli, Fiona Catherine Moreton, Keith W Muir
BACKGROUND AND PURPOSE: Perfusion imaging is used for patient selection in clinical practice and trials. Postprocessing and definitions of tissue viability are nevertheless not standardized. We compared the lesion volumes generated with two well-recognized perfusion tissue definitions in a single-center phase 2 thrombolysis study. METHODS: We analyzed perfusion imaging data from the Alteplase-Tenecteplase Trial Evaluation for Stroke Thrombolysis (ATTEST) study using two popular tissue viability thresholds (ischemic core definition: (1) cerebral blood volume < 2...
April 17, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28413240/detection-of-increased-vasa-vasorum-in-artery-walls-improving-ct-number-accuracy-using-image-deconvolution
#9
Kishore Rajendran, Shuai Leng, Steven M Jorgensen, Dilbar Abdurakhimova, Erik L Ritman, Cynthia H McCollough
Changes in arterial wall perfusion are an indicator of early atherosclerosis. This is characterized by an increased spatial density of vasa vasorum (VV), the micro-vessels that supply oxygen and nutrients to the arterial wall. Detection of increased VV during contrast-enhanced computed tomography (CT) imaging is limited due to contamination from blooming effect from the contrast-enhanced lumen. We report the application of an image deconvolution technique using a measured system point-spread function, on CT data obtained from a photon-counting CT system to reduce blooming and to improve the CT number accuracy of arterial wall, which enhances detection of increased VV...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28412909/prolonged-perfusion-predicts-recurrent-ischemic-stroke-but-not-transient-ischemic-attack-in-patients-with-symptomatic-intracranial-stenosis
#10
Linfang Lan, Xinyi Leng, Vincent Ip, Thomas Leung, Yannie Soo, Jill Abrigo, Ka Sing Wong
BACKGROUND: Intracranial arterial stenosis (ICAS) is the dominant cause for ischemic stroke worldwide, with hemodynamic compromise as a crucial contributor. Prolonged perfusion is commonly observed in ICAS patients on CT perfusion (CTP) maps, while the clinical significance of this perfusion pattern has not been elucidated. METHODS: Patients having symptomatic ICAS of 50-99% stenosis with sustained downstream cerebral blood flow (CBF) were enrolled into this study...
April 13, 2017: Current Neurovascular Research
https://www.readbyqxmd.com/read/28412316/differentiating-stroke-and-seizure-in-acute-setting-perfusion-computed-tomography
#11
Katarzyna Kubiak-Balcerewicz, Urszula Fiszer, Ewa Nagańska, Cezary Siemianowski, Aleksander Sobieszek, Agnieszka Witak-Grzybowska, Aldona Kosińska-Szot
BACKGROUND: Perfusion computed tomography (PCT) is part of acute stroke protocol in many hospitals; however, its clinical utility is still being disputed. Beyond its use in core and penumbra estimation, there is also a question about PCT role in stroke mimics diagnosis. Case series or small, retrospective studies showed equivocal results. This is the first published prospective, comparative study on PCT in differentiating stroke and seizure in acute setting. METHODS: Patients with acute focal neurologic deficits and without acute ischemic lesions on routine CT underwent PCT and electroencephalography (EEG) within 12 hours after symptom onset...
April 13, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28409258/impact-of-knowledge-based-iterative-model-reconstruction-on-myocardial-late-iodine-enhancement-in-computed-tomography-and-comparison-with-cardiac-magnetic-resonance
#12
Yuki Tanabe, Teruhito Kido, Akira Kurata, Naoki Fukuyama, Takahiro Yokoi, Tomoyuki Kido, Teruyoshi Uetani, Mani Vembar, Amar Dhanantwari, Shinichi Tokuyasu, Natsumi Yamashita, Teruhito Mochizuki
We evaluated the image quality and diagnostic performance of late iodine enhancement computed tomography (LIE-CT) with knowledge-based iterative model reconstruction (IMR) for the detection of myocardial infarction (MI) in comparison with late gadolinium enhancement magnetic resonance imaging (LGE-MRI). The study investigated 35 patients who underwent a comprehensive cardiac CT protocol and LGE-MRI for the assessment of coronary artery disease. The CT protocol consisted of stress dynamic myocardial CT perfusion, coronary CT angiography (CTA) and LIE-CT using 256-slice CT...
April 13, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28408704/changing-use-patterns-for-99m-tc-maa-from-2000-to-2015
#13
James A Ponto
Since the early 2000's, evaluation of pulmonary embolism (PE) has shifted from (99m)Tc macroaggregated albumin (MAA) perfusion lung scans to CT angiography (CTA). (99m)Tc MAA continues to be used in patients with contraindications to CTA and for other uses. A reduced number of MAA particles is used in patients with pulmonary hypertension (PH) or other risk factors. This study assessed the changing use patterns for (99m)Tc MAA by comparing snap-shots of procedures in 2000 and in 2015 in one institution. Methods: Records for all patients receiving (99m)Tc MAA in the year 2000 and in 2015 were reviewed, making note of the imaging procedure, any contraindication to CTA, and if a reduced number of MAA particles was used...
April 13, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/28408698/reproducibility-of-lobar-perfusion-and-ventilation-quantification-using-a-spect-ct-segmentation-software-in-lung-cancer-patients
#14
Karine Provost, Antoine Leblond, Annie Gauthier Lemire, Edith Fillion, Houda Bahig, Martin Lord
Planar perfusion scintigraphy with Tc99m-labelled macroaggregated albumin (Tc99m-MAA) is often used for pre-therapy quantification of regional lung perfusion in lung cancer patients, particularly in patients with poor respiratory function. However, subdividing lung parenchyma in rectangular regions of interests, as done on planar images, is a poor reflection of true lobar anatomy. New tridimensional methods using SPECT and SPECT/CT have been introduced, including a semi-automatic lung segmentation software (Hermes Medical Solutions)...
April 13, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/28405830/low-yield-of-ventilation-and-perfusion-imaging-for-the-evaluation-of-pulmonary-embolism-after-indeterminate-ct-pulmonary-angiography
#15
Brian R Curtis, Mougnyan Cox, Michael Poplawski, Andrej Lyshchik
PURPOSE: Ventilation and perfusion (VQ) imaging is common following suboptimal CT pulmonary angiogram (CTPA) for pulmonary embolism (PE) evaluation; however, the results of this diagnostic pathway are unclear. The purpose of our study is to determine the incidence of PE diagnosed on VQ scans performed in patients with suboptimal CTPAs. METHODS: One hundred twenty-two suboptimal CTPAs with subsequent VQ scans within 1 week were retrospectively identified. VQ reports utilizing modified ​prospective investigation of pulmonary embolism diagnosis (PIOPED) and prospective investigative study of acute pulmonary embolism diagnosis (PISAPED) criteria were evaluated for presence of PE; intermediate probability, high probability, and PE present were considered PE positive...
April 12, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28390040/incidental-extra-cardiac-findings-on-13-nh3-myocardial-perfusion-pet-ct
#16
EDITORIAL
Andrei Iagaru
No abstract text is available yet for this article.
April 7, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28390039/incidental-extra-cardiac-findings-on-13-n-ammonia-myocardial-perfusion-pet-ct
#17
H Kan, F M van der Zant, M Wondergem, R J J Knol
BACKGROUND: The objective of this study was to describe the prevalence of incidental extra-cardiac findings (IECFs) on myocardial perfusion PET/CTs and the prevalence of potentially clinically relevant and clinically irrelevant IECFs, as well as detection rate of previously unknown malignancies. METHODS AND RESULTS: From September 2013 until February 2016, a total of 1397 consecutive patients referred for the evaluation of possible ischemia by (13)NH3 PET/CT were prospectively included in a database...
April 7, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28386041/prevalence-of-imaging-biomarkers-to-guide-the-planning-of-acute-stroke-reperfusion-trials
#18
Bin Jiang, Robyn L Ball, Patrik Michel, Tudor Jovin, Manisha Desai, Ashraf Eskandari, Zack Naqvi, Max Wintermark
BACKGROUND AND PURPOSE: Imaging biomarkers are increasingly used as selection criteria for stroke clinical trials. The goal of our study was to determine the prevalence of commonly studied imaging biomarkers in different time windows after acute ischemic stroke onset to better facilitate the design of stroke clinical trials using such biomarkers for patient selection. METHODS: This retrospective study included 612 patients admitted with a clinical suspicion of acute ischemic stroke with symptom onset no more than 24 hours before completing baseline imaging...
April 6, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28380247/a-new-ct-reconstruction-technique-using-adaptive-deformation-recovery-and-intensity-correction-adric
#19
You Zhang, Jianhua Ma, Puneeth Iyenga, Yuncheng Zhong, Jing Wang
PURPOSE: Sequential same-patient CT images may involve deformation-induced and non-deformation-induced voxel intensity changes. An adaptive deformation recovery and intensity correction (ADRIC) technique was developed to improve the CT reconstruction accuracy, and to separate deformation from non-deformation-induced voxel intensity changes between sequential CT images. MATERIALS AND METHODS: ADRIC views the new CT volume as a deformation of a prior high-quality CT volume, but with additional non-deformation-induced voxel intensity changes...
April 5, 2017: Medical Physics
https://www.readbyqxmd.com/read/28378112/automatic-determination-of-cardiovascular-risk-by-ct-attenuation-correction-maps-in-rb-82-pet-ct
#20
Ivana Išgum, Bob D de Vos, Jelmer M Wolterink, Damini Dey, Daniel S Berman, Mathieu Rubeaux, Tim Leiner, Piotr J Slomka
BACKGROUND: We investigated fully automatic coronary artery calcium (CAC) scoring and cardiovascular disease (CVD) risk categorization from CT attenuation correction (CTAC) acquired at rest and stress during cardiac PET/CT and compared it with manual annotations in CTAC and with dedicated calcium scoring CT (CSCT). METHODS AND RESULTS: We included 133 consecutive patients undergoing myocardial perfusion (82)Rb PET/CT with the acquisition of low-dose CTAC at rest and stress...
April 4, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
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