Defining the optimal systolic phase targets using absolute delay time for reconstructions in dual-source coronary CT angiography
Abstract To define the optimal systolic phase for dual-source computed tomography angiography using an absolute reconstruction delay time after the R–R interval based on the coronary artery motion, we analyzed images reconstructed between 200 and 420 miliseconds (ms) after the R wave at 20 ms increments in 21 patients. Based on the American Heart Association coronary segmentation guidelines, the origin of six coronary artery landmarks (RCA, AM1, PDA, LM, OM1, and D2) were selected to calculate the coronary artery motion velocity. The velocity of the given landmark was defined as the quotient of the route and the length of the time interval. The x, y and z-coordinates of the selected landmark were recorded, and were used for the calculation of the 3D route of coronary artery motion by using a specific equation. Differences in velocities were assessed by analysis of variance for repeated measures; Bonferroni post hoc tests were used for multiple pair wise comparisons. 1488 landmarks were measured (6 locations at 12 systolic time points) in 21 patients and were analyzed. The mean values of the minimum velocities were calculated separately for each heart rate group (i.e. 80 bpm). The mean lowest coronary artery velocities in each segment occurred in the middle period of each time interval of the acquired systolic phase i.e. 280–340 ms. No differences were found in the minimal coronary artery velocities between the three HR groups, with the exce...
Myocardial extracellular volume fraction (ECV) derived from CT delayed enhancement (CTDE) may allow assessment of diffuse myocardial fibrosis. However, the amount of contrast medium required for ECV estimation has not been established. Since ECV estimation by CT is typically performed in combination with coronary CT angiography (CCTA) in clinical settings, we aimed to investigate whether reliable ECV estimation is possible using the contrast dose optimized for CCTA without additional contrast administration.
ConclusionSurgical clipping remains a safe and useful treatment option for pericallosal artery aneurysms in a low-resource neurosurgical facility.
Objective: To explore the value of whole-brain perfusion parameters combined with multiphase computed tomography angiography (MP-CTA) in predicting the hemorrhagic transformation (HT) of ischemic stroke. Methods: A total of 64 patients with ischemic stroke who underwent noncontrast computed tomography, computed tomography perfusion imaging, and computed tomography angiography before treatment from August 2017 to June 2019 were included retrospectively. The perfusion parameters cerebral blood volume (CBV), cerebral blood flow (CBF), time to peak (TTP), mean transit time (MTT), time to maximum (Tmax), and permeability surfac...
Discussion: Despite some discrepancy regarding the incidence, both cohorts show a non-negligible long-term risk of aneurysm recurrence and de novo aneurysm formation, which warrants life-long imaging follow-up.Abbreviations: SD: standard deviation; DSA: digital subtraction angiography; CTA: computed tomography angiography; MRA: magnetic resonance angiography; MCA: middle cerebral artery; ACA: anterior cerebral artery; ACommA: anterior communicating artery; ICA: internal carotid artery; ADPKD: autosomal dominant polycystic kidney disease; MeSH: Medical Subject Headings. PMID: 32048571 [PubMed - as supplied by publisher]
This study assessed predictors of pulmonary thromboembolism (PE) resolution and their implications for clinical outcome.MethodA total of 150 patients with acute PE diagnosed by computed tomography pulmonary angiography (CTPA) were included. All patients received anticoagulant therapy for 3 ‐6 months and were followed‐up for at least 2 years. D‐dimer levels in plasma were assayed at the first admission and during follow‐up.ResultsThe rate of CTPA ‐confirmed PE resolution was 48.67% at 6 months, 68% at 12 months, and 78.67% at 24 months. Thirty‐nine patients had recurrent thrombosis after anticoagulation therapy ...
The recent article from McCluskey et al “Radiological Eye Deviation as a Predictor of Large Vessel Occlusion in Acute Ischaemic Stroke” J of Stroke and Cerebrovasc Dis. 2019; 28:2318-23231 provides valuable information that may lead to early stroke intervention. They found that subjective visual detection of radiographic eye deviation on nonenhanced computed tomography (NECT) brain is strongly associated with large vessel occlusion (LVO). This compelling association may expedite patients for timely angiographic testing and endovascular therapy.
AbstractBackgroundAtrial myxoma remains a rare clinical entity with an incidence of surgically resected cases of 0.5 –0.7 per million population and prevalence of
ConclusionsWe successfully developed a deep learning model that can automatically detect aneurysms. The model performed well for aneurysms of different sizes or in different locations. This finding indicates that the deep learning model has the potential to vastly improve clinician performance by providing automated aneurysm detection.
CONCLUSIONS: Renal artery re-intervention following renal denervation with the most commonly applied RF renal denervation system (Symplicity™) is rare. Most events were identified within 1 year. PMID: 32038027 [PubMed - as supplied by publisher]
Coronary Computed Tomography Angiography (CCTA) has been a well established non-invasive technique for the assessment of coronary artery disease (CAD). Despite the advances in CT technology, the artifacts caused by cardiac motion at high heart rates still remain a major issue in the interpretation of cardiac CT images since they affect delineation of coronary anatomy and reduce the ability of physicians to accurately assess stenotic coronary lesions [1,2]. Another deficiency of CCTA is the difficulty in evaluating vessel segments with extensive calcified plaque.