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https://www.readbyqxmd.com/read/28640793/intraoperative-computed-tomography-ct-for-treating-giant-carotid-intracavernous-aneurysms
#1
Zhe Xue, Fuyu Wang, Zhenghui Sun, Hui Zhang, Chen Wu, Dongsheng Kong, Bainan Xu
BACKGROUND Giant carotid intracavernous aneurysm refers to those lesions larger than 2.5 cm and derived from a cavernous segment, accounting for about 30% of all intracranial tumors. Dynamic CT perfusion imaging (PCT) is a common method recently employed to evaluate cerebral perfusion. This study investigated the efficacy and clinical application of intraoperative CT in the surgery for giant symptomatic carotid intracavernous aneurysm. MATERIAL AND METHODS A retrospective analysis was performed on 23 cases with giant symptomatic carotid intracavernous aneurysm...
June 22, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28636734/is-computed-tomography-perfusion-a-useful-method-for-distinguishing-between-benign-and-malignant-neck-masses
#2
Fatih Düzgün, Serdar Tarhan, Gülgün Yılmaz Ovalı, Görkem Eskiizmir, Yüksel Pabuşçu
Evaluation of neck masses is frequent in ear, nose, and throat clinics. Successful outcomes associated with neck mass are directly related to rapid diagnosis and accurate treatment for each patient. Late diagnosis of a malignant mass increases the magnitude of morbidity and the rate of mortality of the disease. Although magnetic resonance imaging and computed tomography (CT) examinations are important tools for evaluating head and neck pathologies, they do not allow functional evaluation. For this reason, CT perfusion (CTP) as a method of functional evaluation for distinguishing benign from malignant masses is gaining attention...
June 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/28630395/cerebral-infarction-by-paradoxical-gas-embolism-during-laparoscopic-liver-resection-with-injury-of-the-hepatic-vessels-in-a-patient-without-a-right-to-left-systemic-shunt
#3
Toshiyasu Kawahara, Masahiro Hagiwara, Hiroyuki Takahashi, Mariko Tanaka, Koji Imai, Jun Sawada, Takayuki Kunisawa, Hiroyuki Furukawa
BACKGROUND Carbon dioxide (CO2) is believed to be the safest gas for laparoscopic surgery, which is a standard procedure. We experienced severe cerebral infarction caused by paradoxical CO2 embolism during laparoscopic liver resection with injury of the hepatic vessels despite the absence of a right-to-left systemic shunt. CASE REPORT A 60-year-old man was diagnosed with hepatocellular carcinoma in the right hepatic lobe secondary to alcoholic liver disease. We planned the laparoscopy-assisted liver resection...
June 20, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28629676/percutaneous-nephrolithotomy-puncture-and-tract-dilation-evidence-on-the-safety-of-approaches-to-the-infundibulum-of-the-middle-renal-calyx
#4
Panagiotis Kallidonis, Christina Kalogeropoulou, Iason Kyriazis, Dimitrios Apostolopoulos, Panagiotis Kitrou, Dimitrios Kotsiris, Panteleimon Ntasiotis, Evangelos Liatsikos
OBJECTIVES: To investigate the anatomical relations of the papillary, infundibular and pelvic approach to percutaneous nephrolithotomy (PCNL) and evaluate the amount of vascularization at the respective sites. MATERIALS: (99m)Tc-dimercaptosuccinic acid SPECT/CT renal scintigraphies or Computerized tomographies perfusion (CTP) were performed in 40 patients (prone n=20 or supine position n=20). The angle of approach (AoA) for access tracts the respective regions of interest (ROIs) to the mid-calyceal papilla and infundibulum as well as renal pelvis were designed and compared...
June 16, 2017: Urology
https://www.readbyqxmd.com/read/28629564/computed-tomography-perfusion-imaging-for-monitoring-transarterial-chemoembolization-of-hepatocellular-carcinoma
#5
Herman P Marquez, Amar Karalli, Holger Haubenreisser, Rishi P Mathew, Hatem Alkadhi, Torkel B Brismar, Thomas Henzler, Michael A Fischer
PURPOSE: To prospectively monitor changes in tumor perfusion of hepatocellular carcinoma (HCC) in response to doxorubicin-eluted bead based transarterial chemoembolization (DEB-TACE) using perfusion-CT (P-CT). METHODS AND MATERIALS: 24 patients (54-79 years) undergoing P-CT before and shortly after DEB-TACE of HCC were prospectively included in this dual-center study. Two readers determined arterial-liver-perfusion (ALP, mL/min/100mL), portal-venous-perfusion (PLP, mL/min/100mL) and the hepatic-perfusion-index (HPI, %) by placing matched regions-of-interests within each HCC before and after DEB-TACE...
June 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28624924/evaluation-of-hepatic-fibrosis-a-review-from-the-society-of-abdominal-radiology-disease-focus-panel
#6
REVIEW
Jeanne M Horowitz, Sudhakar K Venkatesh, Richard L Ehman, Kartik Jhaveri, Patrick Kamath, Michael A Ohliger, Anthony E Samir, Alvin C Silva, Bachir Taouli, Michael S Torbenson, Michael L Wells, Benjamin Yeh, Frank H Miller
Hepatic fibrosis is potentially reversible; however early diagnosis is necessary for treatment in order to halt progression to cirrhosis and development of complications including portal hypertension and hepatocellular carcinoma. Morphologic signs of cirrhosis on ultrasound (US), computed tomography (CT), and magnetic resonance imaging (MRI) alone are unreliable and are seen with more advanced disease. Newer imaging techniques to diagnose liver fibrosis are reliable and accurate, and include magnetic resonance elastography and US elastography (one-dimensional transient elastography and point shear wave elastography or acoustic radiation force impulse imaging)...
June 17, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28622166/quantitative-analysis-of-iodine-image-of-dual-energy-computed-tomography-at-rest-comparison-with-99mtc-tetrofosmin-stress-rest-single-photon-emission-computed-tomography-myocardial-perfusion-imaging-as-the-reference-standard
#7
Takehiro Nakahara, Takuji Toyama, Masahiro Jinzaki, Ryotaro Seki, Yuichiro Saito, Tetsuya Higuchi, Minoru Yamada, Masashi Arai, Yoshito Tsushima, Sachio Kuribayashi, Masahiko Kurabayashi
PURPOSE: Dual-energy computed tomography (DECT) can be used for visual determination of iodine distribution in the myocardium (iodine image); however, the accuracy and reproducibility of the process remains debatable. Because of the low contrast-to-noise ratio of CT, we hypothesized that quantitative measurement may be more accurate for detecting myocardial ischemia. In this study, we evaluated our quantitative method by comparing it with visual analysis using Tc-tetrofosmin (TF) stress-rest single-photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI) as the reference standard...
June 15, 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28621587/treatment-of-severe-hypertension-in-a-14-year-old-child-successful-blood-pressure-control-with-additive-administration-of-captopril-an-angiotensin-converting-enzyme-inhibitor-in-a-patient-with-bilateral-renovascular-hypertension
#8
Xin Zhang, Ying Xu, Xiaoping Chen, Si Wang, Xinran Li, Xin Yan
We report a 14-year-old boy with recurrent episodes of headache caused by uncontrolled hypertension. The diagnosis of renovascular hypertension due to Takaysu arteritis (TA) was made based on an increase in erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) and computed tomography (CT) image of bilateral renal artery stenosis was taken. Renal scintigraphy revealed normal perfusion and function of the right kidney and severe reduction of the perfusion and function of the left kidney. Careful drug adjustments significantly improved but did not fully control the blood pressure (BP); further, angioplasty, which showed almost occlusion of the left renal artery opening and the minor narrowing of the right renal artery, failed to regain sufficient BP control...
June 16, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28619736/effects-of-hypercapnia-on-myocardial-blood-flow-in-healthy-human-subjects
#9
Matthieu Pelletier-Galarneau, Robert A deKemp, Chad Rrn Hunter, Ran Klein, Michael Klein, Joel Ironstone, Joseph A Fisher, Terrence Ruddy
Background: Elevation of end-tidal partial pressure of CO2 (PETCO2) increases cerebral and myocardial blood flow (MBF), suggesting that it may be a suitable alternative to pharmacological stress or exercise for myocardial perfusion imaging. The purpose of this study was to document the pharmacodynamics of CO2 on MBF using prospective end-tidal targeting to precisely control arterial PCO2 and use positron emission tomography (PET) to measure the outcome variable, MBF Methods: 10 healthy males underwent serial (82)Rb PET/CT imaging...
June 15, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28616448/adaptive-statistical-iterative-reconstruction-improves-image-quality-without-affecting-perfusion-ct-quantitation-in-primary-colorectal-cancer
#10
D Prezzi, V Goh, S Virdi, S Mallett, C Grierson, D J Breen
OBJECTIVES: To determine the effect of Adaptive Statistical Iterative Reconstruction (ASIR) on perfusion CT (pCT) parameter quantitation and image quality in primary colorectal cancer. METHODS: Prospective observational study. Following institutional review board approval and informed consent, 32 patients with colorectal adenocarcinoma underwent pCT (100 kV, 150 mA, 120 s acquisition, axial mode). Tumour regional blood flow (BF), blood volume (BV), mean transit time (MTT) and permeability surface area product (PS) were determined using identical regions-of-interests for ASIR percentages of 0%, 20%, 40%, 60%, 80% and 100%...
2017: European Journal of Radiology Open
https://www.readbyqxmd.com/read/28612276/clinical-risk-stratification-of-acute-pulmonary-embolism-comparing-the-usefulness-of-cta-obstruction-score-and-pulmonary-perfusion-defect-score-with-dual-energy-ct
#11
Wei-Fang Kong, Yu-Ting Wang, Long-Lin Yin, Hong Pu, Ke-Yan Tao
To compare the ability of CT angiography (CTA) obstruction score and perfusion defect score on dual energy CT perfusion imaging (DEPI) for clinical risk stratification of patients with acute pulmonary embolism (PE). 55 patients diagnosed as acute PE either by CTA or DEPI were retrospectively enrolled. Patients were grouped into high-, intermediate-, and low-risk groups in accordance to the renewed guidelines of 2014. Consistency between DEPI and CTA in diagnosis of PE were assessed. Correlations between CT parameters and right-to-left ventricular (RV/LV) diameter ratio were evaluated...
June 13, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28611938/anatomic-study-of-the-vascular-perfusion-of-the-sternum-and-its-clinical-relevance-in-deep-sternal-wound-infection
#12
Nick Spindler, Florian Kaatz, Christine Feja, Christian Etz, Friedrich-Wilhelm Mohr, Ingo Bechmann, Christoph Josten, Stefan Langer, Sabine Loeffler
Introduction: Deep sternal wound infections (DSWI) are a rare but devastating complication after median sternotomy. Minor perfusion in bone and soft tissue, especially after recruiting the internal mammary artery for bypass supports the development of wound infection and nonunion of the sternal bone. The aim of the study was the macroscopic and radiological presentation of the vascular system supplying the sternum, in particular the compensating blood supply routes in the event that the internal mammary artery is no longer available after use as a bypass vessel...
2017: GMS Interdisciplinary Plastic and Reconstructive Surgery DGPW
https://www.readbyqxmd.com/read/28607546/histologic-sequelae-of-apical-hypertrophic-cardiomyopathy-dystrophic-calcification
#13
Shahryar G Saba, John N Makaryus, Navid Rahmani, Ram Jadonath
We present cardiac computed tomography (CT) findings demonstrating apical hypertrophic cardiomyopathy with dystrophic calcification of the left ventricular apex. The absence of significant epicardial coronary artery disease demonstrated by coronary CT angiography suggests that increased wall tension and decreased microvascular perfusion over time account for the dyskinetic apical myocardium, rather than myocardial infarction secondary to atherosclerotic plaque rupture. These observations support CT as the imaging modality of choice to visualize the deposition of calcium in injured myocardial tissue, a recognized occurrence in chronically infarcted myocardium...
2017: Clinical Medicine Insights. Cardiology
https://www.readbyqxmd.com/read/28606197/dynamic-four-dimensional-ct-angiography-for-the-assessment-of-pulmonary-perfusion-in-an-adult-patient-with-pulmonary-artery-occlusion-and-major-aortopulmonary-collateral-after-multistage-repair-of-fallot-s-pentalogy
#14
Dirk Loßnitzer, Stefan Baumann, Thomas Henzler
Dynamic CT angiography provides haemodynamic assessment combined with detailed information on complex cardiac anatomy in patients with congenital malformations such as multistage correction of Fallot's Pentalogy.
June 13, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/28604623/dynamic-contrast-enhanced-ultrasound-of-colorectal-liver-metastases-as-an-imaging-modality-for-early-response-prediction-to-chemotherapy
#15
Marie Benzon Mogensen, Martin Lundsgaard Hansen, Birthe Merete Henriksen, Thomas Axelsen, Ben Vainer, Kell Osterlind, Michael Bachmann Nielsen
Our aim was to investigate whether dynamic contrast-enhanced ultrasound (DCE-US) can detect early changes in perfusion of colorectal liver metastases after initiation of chemotherapy. Newly diagnosed patients with colorectal cancer with liver metastases were enrolled in this explorative prospective study. Patients were treated with capecitabine or 5-fluorouracil-based chemotherapy with or without bevacizumab. DCE-US was performed before therapy (baseline) and again 10 days after initiation of treatment. Change in contrast-enhancement in one liver metastasis (indicator lesion) was measured...
June 12, 2017: Diagnostics
https://www.readbyqxmd.com/read/28601258/computed-tomography-perfusion-abnormalities-in-bilateral-thalamic-infarction-due-to-artery-of-percheron-occlusion
#16
Adam MacLellan, Karl Boyle
OBJECTIVE: We aimed to report a novel case of hyperacute computed tomography (CT) perfusion imaging abnormalities in artery of Percheron infarction. METHODS: We described a case of a 74-year-old man who presented acutely to the emergency room with witnessed sudden onset altered level of consciousness. RESULTS: Although initial hyperacute CT brain imaging was reported as normal, subsequent magnetic resonance imaging revealed bilateral paramedian thalamic infarction...
June 7, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28600481/optimal-thresholds-for-ischemic-penumbra-predicted-by-computed-tomography-perfusion-in-patients-with-acute-ischemic-stroke-treated-with-mechanical-thrombectomy
#17
Katsuharu Kameda, Junji Uno, Ryosuke Otsuji, Nice Ren, Shintaro Nagaoka, Kazushi Maeda, Yoshiaki Ikai, Hidefuku Gi
BACKGROUND AND PURPOSE: Optimal thresholds for ischemic penumbra detected by CT perfusion (CTP) in patients with acute ischemic stroke (AIS) have not been elucidated. In this study we investigated optimal thresholds for salvageable ischemic penumbra and the risk of hemorrhagic transformation (HT). METHODS: A total of 156 consecutive patients with AIS treated with mechanical thrombectomy (MT) at our hospital were enrolled. Absolute (a) and relative (r) CTP parameters including cerebral blood flow (aCBF and rCBF), cerebral blood volume (aCBV and rCBV), and mean transit time (aMTT and rMTT) were evaluated for their value in detecting ischemic penumbra in each of seven arbitrary regions of interest defined by the major supplying blood vessel...
June 9, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28598862/the-feasibility-of-low-dose-ct-perfusion-imaging-in-gastric-cancer
#18
Zong-Qiong Sun, Yu-Xi Ge, Lin Chen, Jie Li, Lin-Fang Jin, Zhi-Hui Xie
PURPOSE: To investigate feasibility of applying low-dose CT perfusion imaging (CTPI) to diagnose gastric cancer. MATERIALS AND METHODS: Twenty patients with gastric cancer confirmed by endoscopic biopsy were undergone routine dose (120 kV, 100 mA) and low-dose (120 kV, 50 mA) CTPI examination, respectively. The original data were processed by body perfusion software, and the perfusion parameters values including blood flow (BF), blood volume (BV) and permeability surface (PS) of gastric cancer were measured...
June 3, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28597764/microct-analysis-of-vascular-morphometry-a-comparison-of-right-lung-lobes-in-the-sugen-hypoxic-rat-model-of-pulmonary-arterial-hypertension
#19
Erin M Faight, Kostas Verdelis, Lee Zourelias, Rong Chong, Raymond L Benza, Kelly J Shields
Pulmonary arterial hypertension (PAH) is a rare disease characterized by significant vascular remodeling within the lung. Clinical computed tomography (CT) scans are routinely used to aid in PAH diagnosis. Animal models, including the Sugen-hypoxic rat model (SU/hyp), of PAH closely mimic human PAH development. We have previously used micro-computed tomography (microCT) to find extensive right lung vascular remodeling in the SU/hyp. We hypothesized that the individual right lung lobes may not contribute equally to overall lung vascular remodeling...
April 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28596576/knee-subchondral-bone-perfusion-and-its-relationship-to-marrow-fat-and-trabeculation-on-multi-parametric-mri-and-micro-ct-in-experimental-ckd
#20
Chao-Ying Wang, Yu-Juei Hsu, Yi-Jen Peng, Herng-Sheng Lee, Yue-Cune Chang, Chih-Shan Chang, Shih-Wei Chiang, Yi-Chih Hsu, Ming-Huang Lin, Guo-Shu Huang
The pathogenesis of chronic kidney disease (CKD) is multifactorial. In the progression of CKD arthropathy, arteriosclerosis may alter the knee subchondral bone marrow by altering blood flow through the bone vasculature. Herein, multi-parametric MRI assessment, including dynamic contrast enhanced magnetic resonance imaging (DCE-MRI), magnetic resonance spectroscopy (MRS), MRI T2*, contrast enhanced MR angiography (CE-MRA), and micro-CT were applied in a rodent nephrectomy model to: 1) investigate the blood perfusion of subchondral bone marrow and its relationship to fat water content and trabeculation pattern in CKD and 2) demonstrate the feasibility of using multi-parametric MRI parameters as imaging biomarkers to evaluate the disease's progression...
June 8, 2017: Scientific Reports
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