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Ct angiography

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https://www.readbyqxmd.com/read/28937826/choroidal-variations-in-diabetic-macular-edema-fluorescein-angiography-and-optical-coherence-tomography
#1
Xiangning Wang, Shuting Li, Wei Li, Yanjun Hua, Qiang Wu
PURPOSES: To (i) evaluate variations in choroidal thickness (CT) and choroidal volume (CV) in diabetic macular edema (DME), as demonstrated by fluorescein angiography (FA) and enhanced depth-imaging (EDI) optical coherence tomography (OCT) (EDI-OCT) and (ii) correlate these variations with visual acuity. METHODS: This study was a retrospective observational case series of patients with diabetic retinopathy (DR) and DME. The study groups comprised 77 DR patients (n = 87), all of whom underwent color fundus photography, FA, and OCT on the same day...
September 22, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28937495/noninvasive-computed-tomography-derived-fractional-flow-reserve-based-on-structural-and-fluid-analysis-reproducibility-of-on-site-determination-by-unexperienced-observers
#2
Keiken Ri, Kanako K Kumamaru, Shinichiro Fujimoto, Yuko Kawaguchi, Tomotaka Dohi, Sou Yamada, Kazuhisa Takamura, Yosuke Kogure, Norikazu Yamada, Etsuro Kato, Ryusuke Irie, Tomohiro Takamura, Michimasa Suzuki, Masaaki Hori, Shigeki Aoki, Hiroyuki Daida
OBJECTIVE: The aim of this study was to evaluate the reproducibility of computed tomography (CT)-derived fractional flow reserve (FFR) determined on site by inexperienced observers using a postprocessing software based on structural and fluid analysis. METHODS: Using 21 coronary vessels in 7 patients who underwent 320-row coronary CT angiography and catheter-FFR, 2 independent inexperienced observers (A: a student radiation technologist; B: a nonmedical staff) determined the CT-FFR using a postprocessing software...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937494/high-pitch-coronary-computed-tomographic-angiography-using-the-third-generation-dual-source-computed-tomography-initial-experience-in-patients-with-high-heart-rate
#3
Ruiqi Feng, Jingsong Mao, Xiaofei Liu, Yu Zhao, Jiajie Tong, Liang Zhang
OBJECTIVE: This study aimed to evaluate the feasibility, image quality, and radiation dose of prospectively high-pitch coronary computed tomographic (CT) angiography in patients with high heart rates (HRs) using the third-generation dual-source CT. METHODS: One hundred consecutive patients with sinus rhythm and HR between 70 and 100 beats per minute were enrolled into this study. All patients were divided into 2 groups. Patients in group A (n = 46) were examined with prospectively high-pitch scan mode in which image acquisition was triggered at 30% of the R-R interval...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937491/improved-calcium-scoring-at-dual-energy-computed-tomography-angiography-using-a-high-z-contrast-element-and-novel-material-separation-technique
#4
Jack W Lambert, Yuxin Sun, Karen G Ordovas, Robert G Gould, Sizhe Wang, Benjamin M Yeh
OBJECTIVES: The aim of this study was to compare the accuracy of existing dual-energy computed tomography (CT) angiography coronary artery calcium scoring methods to those obtained using an experimental tungsten-based contrast material and a recently described contrast material extraction process (CMEP). METHODS: Phantom coronary arteries of varied diameters, with different densities and arcs of simulated calcified plaque, were sequentially filled with water, iodine, and tungsten contrast materials and scanned within a thorax phantom at rapid-kVp-switching dual-energy CT...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28935463/image-guidance-for-transcatheter-aortic-valve-implantation-tavi-and-cerebral-embolic-protection
#5
I Vernikouskaya, W Rottbauer, B Gonska, C Rodewald, J Seeger, V Rasche, J Wöhrle
The study was aimed at evaluation of the feasibility and potential benefit of image fusion (IF) of pre-procedural CT angiography (CTA) and x-ray (XR) fluoroscopy for image-guided navigation in transfemoral transcatheter aortic valve implantation (TAVI) with the strong focus on guiding the double-filter cerebral embolic protection device and valve prosthesis placement. METHODS: In 31 patients undergoing TAVI, image registration of CTA-derived 3D anatomical models of the relevant cardiac anatomy and vasculature, and live XR was performed applying a commercially available navigation tool...
September 19, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28935012/-combining-3d-ctba-and-3d-vats-single-operation-hole-to-%C3%A2-anatomical-segmentectomy-in-the-treatment-of-non-small-cell-lung-cancer
#6
Xiaowei She, Yunbin Gu, Chun Xu, Xinyu Song, Chang Li, Cheng Ding, Jun Chen, Yongsheng Gong, Jun Zhao
BACKGROUND: China is a high-incidence area of lung cancer, and its morbidity and mortality were the highest in malignant tumors. At present, the popularization of low-dose computed tomography (CT) examination has significantly improved the detection rate of early lung cancer, anatomical segmentectomy is currently widely used early in non-small cell lung cancer (NSCLC) and those who cannot tolerate lobectomy in patients with lung cancer. However, the anatomical structure of segment and its surgical operation is relatively complex, lead to segmentectomy has a high risk and difficulty...
September 20, 2017: Zhongguo Fei Ai za Zhi, Chinese Journal of Lung Cancer
https://www.readbyqxmd.com/read/28931782/tumor-necrosis-factor-%C3%AE-gene-expression-in-epicardial-adipose-tissue-is-related-to-coronary-atherosclerosis-assessed-by-computed-tomography
#7
Toshiro Kitagawa, Hideya Yamamoto, Takuya Hattori, Kazuhiro Sentani, Shinya Takahashi, Atsuhiro Senoo, Yumiko Kubo, Wataru Yasui, Taijiro Sueda, Yasuki Kihara
AIMS: Tumor necrosis factor (TNF)-α reportedly has key pro-inflammatory properties in both atherosclerosis and adipocytes. To further investigate the biologic impact of epicardial adipose tissue (EAT) on coronary atherosclerosis, we evaluated the relationship between TNF-α gene expression in EAT and clinically-assessed coronary atherosclerosis on computed tomography (CT). METHODS: We studied 47 patients before cardiac surgery (coronary artery bypass grafting [CABG], n=26; non-CABG, n=21), assessing visceral adipose tissue (VAT) area, EAT volume, coronary calcium score (CCS), and the presence of non- and/or partially-calcified coronary plaque (NCP) on CT angiography...
September 20, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28931768/study-of-hepatic-artery-cone-beam-imaging-by-low-rate-injection-in-iodinated-contrast-agent
#8
Mitsuru Osawa, Tadafumi Takano, Akihiko Hanawa, Yasuhiro Minami, Hiroshi Miura
PURPOSE: CT during hepatic arteriography (CTHA) of cone-beam computed tomography (CBCT) provides valid information in performing transcatheter arterial chemo-embolization (TACE). The usefulness of CTHA with the diluted contrast medium has been reported in some medical conferences. However, the operation becomes somehow complicated for the medical institutions that have angiography injectors with a single head. In this study, we aimed to investigate the clinical equivalence of low-rate injection method and diluted injection method...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28930854/a-female-patient-with-hypokalaemia-induced-j-wave-syndrome-an-unusual-case-report
#9
Aqian Wang, Xiang Li, Muhammad Nabeel Dookhun, Tiancheng Zhang, Ping Xie, Yunshan Cao
RATIONALE: Prominent J waves can be seen in life-threatening cardiac arrhythmias such as Brugada syndrome, early repolarization syndrome, and ventricular fibrillation. We herein present an unusual case report of hypokalemia-induced J wave syndrome and ST (a part of ECG) segment elevation. PATIENTS CONCERNS: A 52-year-old woman with chief complaints of chest pain for 2 hours and diarrhea showed a marked hypokalemia (2.8 mmol/L) and slightly elevated creatine kinase-MB (CK-MB) (57...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28929333/late-iodine-enhancement-computed-tomography-with-image-subtraction-for-assessment-of-myocardial-infarction
#10
Yuki Tanabe, Teruhito Kido, Akira Kurata, Takanori Kouchi, Naoki Fukuyama, Takahiro Yokoi, Teruyoshi Uetani, Natsumi Yamashita, Masao Miyagawa, Teruhito Mochizuki
OBJECTIVE: To evaluate the feasibility of image subtraction in late iodine enhancement CT (LIE-CT) for assessment of myocardial infarction (MI). METHODS: A comprehensive cardiac CT protocol and late gadolinium enhancement MRI (LGE-MRI) was used to assess coronary artery disease in 27 patients. LIE-CT was performed after stress CT perfusion (CTP) and CT angiography. Subtraction LIE-CT was created by subtracting the mask volume of the left ventricle (LV) cavity from the original LIE-CT using CTP dataset...
September 19, 2017: European Radiology
https://www.readbyqxmd.com/read/28928803/64-slice-spiral-double-low-ct-to-evaluate-the-degree-of-stenosis-and-plaque-composition-in-diagnosing-coronary-artery-disease
#11
Xiao-Rong Feng, Li-Hua Liang, Ju-Fang Wu, Yao-Qiang Chen, Shuang Liang
This study examined the application of 64-slice spiral double-low computed tomography (CT) to evaluate the degree of coronary artery stenosis. We examined 45 patients with coronary heart disease by 64-slice spiral double-low CT and coronary angiography (CAG) to determine CT accuracy in evaluating coronary artery stenosis. Imaging analysis from 64-slice spiral double-low CT identified 199 segments with coronary stenosis from 45 patients, including 46 segments with mild stenosis, 38 with moderate stenosis and 115 with severe stenosis or artery occlusion...
October 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28926370/photon-counting-computed-tomography-for-vascular-imaging-of-the-head-and-neck-first-in-vivo-human-results
#12
Rolf Symons, Daniel S Reich, Mohammadhadi Bagheri, Tyler E Cork, Bernhard Krauss, Stefan Ulzheimer, Steffen Kappler, David A Bluemke, Amir Pourmorteza
PURPOSE: The purpose of this study was to evaluate image quality of a spectral photon-counting detector (PCD) computed tomography (CT) system for evaluation of major arteries of the head and neck compared with conventional single-energy CT scans using energy-integrating detectors (EIDs). METHODS: In this institutional review board-approved study, 16 asymptomatic subjects (7 men) provided informed consent and received both PCD and EID contrast-enhanced CT scans of the head and neck (mean age, 58 years; range, 46-75 years)...
September 18, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28926310/coronary-ct-angiography-derived-fractional-flow-reserve
#13
Christian Tesche, Carlo N De Cecco, Moritz H Albrecht, Taylor M Duguay, Richard R Bayer, Sheldon E Litwin, Daniel H Steinberg, U Joseph Schoepf
Invasive coronary angiography (ICA) with measurement of fractional flow reserve (FFR) by means of a pressure wire technique is the established reference standard for the functional assessment of coronary artery disease (CAD) ( 1 , 2 ). Coronary computed tomographic (CT) angiography has emerged as a noninvasive method for direct assessment of CAD and plaque characterization with high diagnostic accuracy compared with ICA ( 3 , 4 ). However, the solely anatomic assessment provided with both coronary CT angiography and ICA has poor discriminatory power for ischemia-inducing lesions...
October 2017: Radiology
https://www.readbyqxmd.com/read/28924291/varied-percutaneous-and-endovascular-management-of-large-iatrogenic-profunda-femoris-artery-pseudoaneurysm
#14
Wasey Jillani, Raza Sayani, Masood Umer, Muhammad Azeemuddin
The case of an elderly male diagnosed with a large iatrogenic pseudoaneurysm arising from the profunda femoris artery on ultrasound examination is presented. The immediate postoperative period was uneventful; however later he developed leg swelling and mild oozing at the incision site. In view of deranged renal function CT angiogram was not done and decision was made to treat the pseudoaneurysm with percutaneous thrombin injection. Almost complete thrombosis was achieved however a small residual portion remained patent near the neck...
September 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28924070/-a-case-of-cerebral-venous-sinus-thrombosis-secondary-to-subclinical-basedow-disease
#15
Ichiro Kawahara, Keisuke Toyoda, Makoto Hirose, Naoki Kitagawa
Cerebral venous sinus thrombosis(CVST)is a rare condition accounting for <1% of all strokes. It has been linked to a multitude of risk factors, including infections, oral contraceptive use, coronary disease, malignant disease, trauma, surgery, coagulopathy and several others. However, the association between hyperthyroidism and CVST is poorly understood. We describe here a rare case of CVST, secondary to subclinical Basedow disease. A 68-year-old woman with general fatigue, headache, speech disturbance and slow behavior was admitted to our hospital...
September 2017: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/28922970/use-of-synchrotron-radiation-to-accurately-assess-cross-sectional-area-reduction-of-the-aortic-branch-ostia-caused-by-suprarenal-stent-wires
#16
Zhonghua Sun, Curtise K C Ng
PURPOSE: To compare in vivo the use of synchrotron radiation to computed tomography angiography (CTA) for the measurement of cross-sectional area (CSA) reduction of the aortic branch ostia caused by suprarenal stent-graft wires. METHODS: This study was performed with a Zenith stent-graft placed in a phantom of the human aorta to simulate treatment of abdominal aortic aneurysm. Synchrotron radiation scans were performed using beam energies between 40 and 100 keV and spatial resolution of 19...
September 1, 2017: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/28922275/indications-for-ct-angiography-of-the-vertebral-arteries-after-trauma
#17
Joseph P Drain, Douglas S Weinberg, James S Ramey, Timothy A Moore, Heather A Vallier
STUDY DESIGN: Retrospective. OBJECTIVE: The purpose of this project is to identify factors that predict vertebral artery injury (VAI) in an effort to assess risks and benefits of computed tomography angiography (CT-A) of the neck in the trauma setting. We seek to develop guidelines for practitioners to stratify patients at medium/high risk of VAI from those who are at low risk. SUMMARY OF BACKGROUND DATA: VAI and blunt carotid injury (BCI) together comprise blunt cerebrovascular injury (BCVI)...
September 15, 2017: Spine
https://www.readbyqxmd.com/read/28920508/internal-carotid-artery-dissection-among-younger-and-older-patients-with-acute-ischemic-stroke
#18
Y Amsalem, L Porat, M C Javitt, E Sprecher, G Telman
BACKGROUND: Carotid artery dissection (CAD) is a known causative factor in the etiology of acute ischemic stroke in young patients. However, the significance of CAD in older patients with acute ischemic stroke is unclear with only a few prior clinical studies. In order to isolate the influence of CAD as an independent factor, we performed multivariate analysis of common covariables in acute ischemic stroke patients in northern Israel. PATIENTS AND METHODS: 347 consecutive patients who suffered from acute ischemic stroke had initial CT angiography (CTA) ordered from the emergency room...
September 16, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28919565/treatment-of-large-or-giant-cavernous-aneurysm-associated-with-a-persistent-trigeminal-artery-a-case-report-and-review-of-literature
#19
Tatsuya Ishikawa, Koji Yamaguchi, Hidenori Anami, Masatake Sumi, Tomomi Ishikawa, Takakazu Kawamata
BACKGROUND: Primitive trigeminal artery (PTA) is the most common anomaly of primitive carotid-basilar anastomosis and is associated with cerebrovascular anomalies, such as aneurysm. Large or giant cavernous aneurysm associated with PTA is rare, and the treatment strategies differ in comparison to large or giant aneurysm without PTA. In this article, we report an unusual case of a giant cavernous aneurysm associated with PTA and review treatment strategies for large or giant cavernous aneurysm associated with PTA...
September 14, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28919354/ct-angiography-for-planning-of-percutaneous-closure-of-a-sinus-venosus-atrial-septal-defect-using-a-covered-stent
#20
Zachary M Gertz, Brian J Strife, Pranav R Shah, Kendall Parris, John D Grizzard
No abstract text is available yet for this article.
September 12, 2017: Journal of Cardiovascular Computed Tomography
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