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Cardiac imaging

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https://www.readbyqxmd.com/read/29222954/evaluation-of-motion-artifact-metrics-for-coronary-ct-angiography
#1
Hongfeng Ma, Eric Gros, Aniko Szabo, Scott G Baginski, Zachary R Laste, Naveen M Kulkarni, Darin Okerlund, Taly G Schmidt
PURPOSE: This study quantified the performance of coronary artery motion artifact metrics relative to human observer ratings. Motion artifact metrics have been used as part of motion correction and best-phase selection algorithms for Coronary Computed Tomography Angiography (CCTA). However, the lack of ground truth makes it difficult to validate how well the metrics quantify the level of motion artifact. This study investigated five motion artifact metrics, including two novel metrics, using a dynamic phantom, clinical CCTA images, and an observer study that provided ground truth motion artifact scores from a series of pairwise comparisons...
December 9, 2017: Medical Physics
https://www.readbyqxmd.com/read/29222861/zero-fluoroscopy-permanent-pacemaker-implantation-using-ensite-navx-system-clinical-viability-or-fanciful-technique
#2
Ping Guo, Jie Qiu, Yan Wang, Guangzhi Chen, Riccardo Proietti, Al-Selmi Fadhle, Chunxia Zhao, Dao Wen Wang
BACKGROUND: Fluoroscopy is the imaging modality routinely used for cardiac device implantation and electrophysiological procedures. Due to the rising concern regarding the harmful effects of radiation exposure to both the patients and operation staffs, novel 3D mapping systems have been developed and implemented in electrophysiological procedure for the navigation of catheters inside the heart chambers. Their applicability in cardiac device implantation has been rarely reported. Our aim is to evaluate the feasibility and safety of permanent pacemaker implantation without fluoroscopy...
December 9, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29222852/free-breathing-whole-heart-3d-cine-magnetic-resonance-imaging-with-prospective-respiratory-motion-compensation
#3
Mehdi H Moghari, Ashita Barthur, Maria E Amaral, Tal Geva, Andrew J Powell
PURPOSE: To develop and validate a new prospective respiratory motion compensation algorithm for free-breathing whole-heart 3D cine steady-state free precession (SSFP) imaging. METHODS: In a 3D cine SSFP sequence, 4 excitations per cardiac cycle are re-purposed to prospectively track heart position. Specifically, their 1D image is reconstructed and routed into the scanner's standard diaphragmatic navigator processing system. If all 4 signals are in end-expiration, cine image data from the entire cardiac cycle is accepted for image reconstruction...
December 8, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29221976/modeling-patient-specific-deformable-mitral-valves
#4
REVIEW
Olivia Ginty, John Moore, Terry Peters, Daniel Bainbridge
Medical imaging has advanced enormously over the last few decades, revolutionizing patient diagnostics and care. At the same time, additive manufacturing has emerged as a means of reproducing physical shapes and models previously not possible. In combination, they have given rise to 3-dimensional (3D) modeling, an entirely new technology for physicians. In an era in which 3D imaging has become a standard for aiding in the diagnosis and treatment of cardiac disease, this visualization now can be taken further by bringing the patient's anatomy into physical reality as a model...
September 7, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29221746/clinical-and-neuroimaging-characteristics-of-cerebral-sinovenous-thrombosis-in-neonates-undergoing-cardiac-surgery
#5
Nathalie H P Claessens, Selma O Algra, Nicolaas J G Jansen, Floris Groenendaal, Esther de Wit, Alexander A Wilbrink, Felix Haas, Antonius N J Schouten, Rutger A J Nievelstein, Manon J N L Benders, Linda S de Vries
OBJECTIVES: Neonates with congenital heart disease may have an increased risk of cerebral sinovenous thrombosis, but incidence rates are lacking. This study describes the clinical and neuroimaging characteristics of cerebral sinovenous thrombosis in neonates undergoing cardiac surgery. METHODS: Forty neonates (78% male) requiring neonatal univentricular or biventricular cardiac repair using cardiopulmonary bypass were included. All underwent preoperative (median postnatal day 7) and postoperative (median postoperative day 7) magnetic resonance imaging of the brain, including venography, to detect cerebral sinovenous thrombosis...
November 8, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29220208/changing-utilization-of-noninvasive-diagnostic-imaging-over-2-decades-an-examination-family-focused-analysis-of-medicare-claims-using-the-neiman-imaging-types-of-service-categorization-system
#6
David A Rosman, Richard Duszak, Wenyi Wang, Danny R Hughes, Andrew B Rosenkrantz
OBJECTIVE: The objective of our study was to use a new modality and body region categorization system to assess changing utilization of noninvasive diagnostic imaging in the Medicare fee-for-service population over a recent 20-year period (1994-2013). MATERIALS AND METHODS: All Medicare Part B Physician Fee Schedule services billed between 1994 and 2013 were identified using Physician/Supplier Procedure Summary master files. Billed codes for diagnostic imaging were classified using the Neiman Imaging Types of Service (NITOS) coding system by both modality and body region...
December 8, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29218817/impact-of-a-shared-decision-making-intervention-on-healthcare-utilization-a-secondary-analysis-of-the-chest-pain-choice-multicenter-randomized-trial
#7
Jason T Schaffer, Erik P Hess, Judd E Hollander, Jeffrey A Kline, Carlos A Torres, Deborah B Diercks, Russell Jones, Kelly P Owen, Zachary F Meisel, Michel Demers, Annie Leblanc, Jonathan Inselman, Jeph Herrin, Victor M Montori, Nilay D Shah
BACKGROUND: Patients at low risk for acute coronary syndrome (ACS) are frequently admitted for observation and cardiac testing, resulting in substantial burden and cost to the patient and the healthcare system. OBJECTIVES: The purpose of this investigation was to measure the effect of the Chest Pain Choice decision aid (CPC) on overall healthcare utilization as well as utilization of specific services both during the index emergency department visit and in the subsequent 45 days...
December 8, 2017: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/29218487/3d-true-phase-polarity-recovery-with-independent-phase-estimation-using-three-tier-stacks-based-region-growing-3d-trips
#8
Haining Liu, Gregory J Wilson, Niranjan Balu, Jeffrey H Maki, Daniel S Hippe, Wei Wu, Hiroko Watase, Jinnan Wang, Martin L Gunn, Chun Yuan
OBJECTIVES: A postprocessing technique termed 3D true-phase polarity recovery with independent phase estimation using three-tier stacks based region growing (3D-TRIPS) was developed, which directly reconstructs phase-sensitive inversion-recovery images without acquisition of phase-reference images. The utility of this technique is demonstrated in myocardial late gadolinium enhancement (LGE) imaging. MATERIALS AND METHODS: A data structure with three tiers of stacks was used for 3D-TRIPS to directly achieve reliable region growing for successful background-phase estimation...
December 7, 2017: Magma
https://www.readbyqxmd.com/read/29218105/systemic-inflammation-is-associated-with-myocardial-fibrosis-diastolic-dysfunction-and-cardiac-hypertrophy-in-patients-with-hypertrophic-cardiomyopathy
#9
Lu Fang, Andris H Ellims, Anna L Beale, Andrew J Taylor, Andrew Murphy, Anthony M Dart
BACKGROUND: Regional or diffuse fibrosis is an early feature of hypertrophic cardiomyopathy (HCM) and is related to poor prognosis. Previous studies have documented low-grade inflammation in HCM. The aim of this study was to examine the relationships between circulating inflammatory markers and myocardial fibrosis, systolic and diastolic dysfunction, and the degree of cardiac hypertrophy in HCM patients. METHODS AND RESULTS: Fifty HCM patients were recruited while 20 healthy subjects served as the control group...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/29217634/anthracycline-cardiotoxicity-an-update-on-mechanisms-monitoring-and-prevention
#10
REVIEW
Peter A Henriksen
Anthracycline chemotherapy causes dose-related cardiomyocyte injury and death leading to left ventricular dysfunction. Clinical heart failure may ensue in up to 5% of high-risk patients. Improved cancer survival together with better awareness of the late effects of cardiotoxicity has led to growing recognition of the need for surveillance of anthracycline-treated cancer survivors with early intervention to treat or prevent heart failure. The main mechanism of anthracycline cardiotoxicity is now thought to be through inhibition of topoisomerase 2β resulting in activation of cell death pathways and inhibition of mitochondrial biogenesis...
December 7, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/29217342/cinematic-rendering-of-cardiac-ct-volumetric-data-principles-and-initial-observations
#11
Steven P Rowe, Pamela T Johnson, Elliot K Fishman
BACKGROUND: Cinematic rendering (CR) a new method of 3D computed tomography (CT) volumetric visualization that produces photorealistic images. As with traditional 3D visualization methods, CR may prove to be of value in providing important information when evaluating regions of complex anatomy such as the heart. METHODS: The gated, IV contrast-enhanced chest CT angiogram data from three recent patients were evaluated with CR. Image comparision demonstrates the difference between CR and traditional volume rendering (VR), owing to a more complex lighting model that enhances surface detail and produces realistic shadows to add depth to 3D visualizations...
December 2, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/29217341/coronary-artery-disease-reporting-and-data-system-cad-radstm-inter-observer-agreement-for-assessment-categories-and-modifiers
#12
Christopher D Maroules, Christian Hamilton-Craig, Kelley Branch, James Lee, Roberto C Cury, Pál Maurovich-Horvat, Ronen Rubinshtein, Dustin Thomas, Michelle Williams, Yanshu Guo, Ricardo C Cury
BACKGROUND: The Coronary Artery Disease Reporting and Data System (CAD-RADS) provides a lexicon and standardized reporting system for coronary CT angiography. OBJECTIVES: To evaluate inter-observer agreement of the CAD-RADS among an panel of early career and expert readers. METHODS: Four early career and four expert cardiac imaging readers prospectively and independently evaluated 50 coronary CT angiography cases using the CAD-RADS lexicon...
December 5, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/29216977/noninvasive-cardiac-imaging-and-the-prediction-of-heart-failure-progression-in%C3%A2-preclinical-stage-a-b-subjects
#13
REVIEW
Fei Fei Gong, Duncan J Campbell, David L Prior
Heart failure (HF) continues to grow as a cause of morbidity and mortality in our community and presents a significant public health problem, predominantly in individuals ≥65 years of age. Early intervention in asymptomatic HF subjects (Stage A/B) at risk of progression to symptomatic HF (Stage C/D) may provide an opportunity to halt this epidemic. The ability of cardiac imaging to assess cardiac structure and function permits early identification of those at increased risk of developing symptomatic HF. Systolic, diastolic, and structural left ventricular parameters each predict symptomatic HF, but no single parameter has sufficient sensitivity for screening to identify individuals with Stage A/B HF who are at increased risk of disease progression...
December 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29216303/three-dimensional-self-gated-cardiac-mr-imaging-for-the-evaluation-of-myocardial-infarction-in-mouse-model-on-a-3t-clinical-mr-system
#14
Xiaoyong Zhang, Bensheng Qiu, Zijun Wei, Fei Yan, Caiyun Shi, Shi Su, Xin Liu, Jim X Ji, Guoxi Xie
PURPOSE: To develop and assess a three-dimensional (3D) self-gated technique for the evaluation of myocardial infarction (MI) in mouse model without the use of external electrocardiogram (ECG) trigger and respiratory motion sensor on a 3T clinical MR system. METHODS: A 3D T1-weighted GRE sequence with stack-of-stars sampling trajectories was developed and performed on six mice with MIs that were injected with a gadolinium-based contrast agent at a 3T clinical MR system...
2017: PloS One
https://www.readbyqxmd.com/read/29216285/myocardial-adaption-to-hi-r-t-in-previously-untrained-men-with-a-randomized-longitudinal-cardiac-mr-imaging-study-physical-adaptions-in-untrained-on-strength-and-heart-trial-push-trial
#15
Michael Scharf, Derya Oezdemir, Axel Schmid, Wolfgang Kemmler, Simon von Stengel, Matthias S May, Michael Uder, Michael M Lell
OBJECTIVE: Although musculoskeletal effects in resistance training are well described, little is known about structural and functional cardiac adaption in formerly untrained subjects. We prospectively evaluated whether short term high intensity (resistance) training (HI(R)T) induces detectable morphologic cardiac changes in previously untrained men in a randomized controlled magnetic resonance imaging (MRI) study. MATERIALS AND METHODS: 80 untrained middle-aged men were randomly assigned to a HI(R)T-group (n = 40; 43...
2017: PloS One
https://www.readbyqxmd.com/read/29216218/stroke-subtype-classification-by-geometrical-descriptors-of-lesion-shape
#16
Bastian Cheng, Christian Knaack, Nils Daniel Forkert, Renate Schnabel, Christian Gerloff, Götz Thomalla
BACKGROUND AND PURPOSE: Inference of etiology from lesion pattern in acute magnetic resonance imaging is valuable for management and prognosis of acute stroke patients. This study aims to assess the value of three-dimensional geometrical lesion-shape descriptors for stroke-subtype classification, specifically regarding stroke of cardioembolic origin. METHODS: Stroke Etiology was classified according to ASCOD in retrospectively selected patients with acute stroke...
2017: PloS One
https://www.readbyqxmd.com/read/29215545/metal-artifact-free-and-dose-efficient-computed-tomography-imaging-of-a-cardiac-prosthetic-valve-using-spectral-shaping-of-the-x-ray-beam-a-case-report
#17
Christoph Schabel, Nishant K Sekaran, Andrew Wang, Lynne Hurwitz
Bioprosthetic valve (BPV) thrombosis can be challenging to diagnose with cardiac computed tomography owing to metal artifacts of the BPV. In this case report, an optimized metal artifact reduction protocol using a third-generation dual-source multidetector computed tomographic scanner with high kVp (Sn150kVp) and tin (Sn) filtration and high temporal resolution yielded high-quality, artifact-free, dynamic images of a thrombosed mitral BPV.
December 5, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29215469/multimodality-coronary-imaging-to-predict-periprocedural-myocardial-necrosis-after-an-elective-percutaneous-coronary-intervention
#18
Masahiro Hoshino, Taishi Yonetsu, Tadashi Murai, Yoshihisa Kanaji, Eisuke Usui, Masao Yamaguchi, Masahiro Hada, Rikuta Hamaya, Yoshinori Kanno, Tetsumin Lee, Tsunekazu Kakuta
BACKGROUND: Although multiple imaging modalities have been tested to predict periprocedural myocardial necrosis (PMN), the superior predictive efficacy of these imaging findings has not been established fully. We sought to evaluate which findings of the coronary imaging tools would best provide predictive efficacy of PMN among optical coherence tomography (OCT), intravascular ultrasound (IVUS), and coronary computed tomography (CCT) angiography. PATIENTS AND METHODS: A total of 130 patients with stable angina pectoris who underwent OCT, IVUS, and CCT examinations for a single de-novo preprocedural lesion were investigated...
December 5, 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/29215416/cardiac-fibroma-an-uncommon-cause-of-a-fixed-defect-on-myocardial-perfusion-imaging
#19
Sarah Pittman, Pooja Sethi, Robert R Flavell, Miguel Hernandez Pampaloni
A 66-year-old woman was referred for evaluation of coronary artery disease. Myocardial perfusion imaging (MPI) was performed, and showed a medium-sized, severe fixed perfusion defect in the inferior and inferolateral wall from apex to midcavity. On review of prior imaging, it was noted that the patient had an incidental finding of an intramural cardiac mass on chest CT performed 8 years prior. Subsequent cardiac MRI showed findings consistent with a cardiac fibroma in the left ventricle, at the location of the perfusion defect on MPI...
December 5, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/29215412/serial-fdg-pet-ct-imaging-in-the-management-of-cardiac-sarcoidosis
#20
William Bremer, Nadera J Sweiss, Yang Lu
A 60-year-old woman with biopsy-proven cardiac sarcoidosis status post implantable cardioverter defibrillator placement presented with periodic dizziness and dyspnea on exertion. Myocardial perfusion scan demonstrated a moderate sized, fixed perfusion defect along the mid to proximal anteroseptal wall of the left ventricle, with better perfusion on stress images. FDG-PET/CT demonstrated corresponding focal FDG avidity of the mid to proximal anteroseptal wall, suggestive of active cardiac sarcoidosis. Because of severe side effects, mycophenolate mofetil was discontinued, and the patient received low-dose steroid therapy...
December 5, 2017: Clinical Nuclear Medicine
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