Browsing by Author "Steigner, Michael"
Now showing items 1-20 of 21
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Accuracy and reproducibility of automated, standardized coronary transluminal attenuation gradient measurements
Chatzizisis, Yiannis; George, Elizabeth; Cai, Tianrun; Fulwadhva, Urvi P; Kumamaru, Kanako; Schultz, Kurt; Fujisawa, Yasuko; Rassi, Carlos; Steigner, Michael L.; Mather, Richard T.; Blankstein, Ron; Rybicki, Frank; Mitsouras, Dimitrios (Springer Nature, 2014)Purpose Coronary Computed Tomography Angiography (CCTA) contrast opacification gradients, or Transluminal Attenuation Gradients (TAG) offer incremental value to predict functionally significant lesions. This study ... -
Anomalous origin of the coronary artery arising from the opposite sinus: prevalence and outcomes in patients undergoing coronary CTA
Cheezum, Michael; Ghoshhajra, Brian Burns; Bittencourt, Marcio S.; Hulten, Edward A.; Bhatt, Ami Bharat; Mousavi, Negareh; Shah, Nishant; Valente, Anne Marie; Rybicki, Frank; Steigner, Michael L.; Hainer, Jon; MacGillivray, Thomas; Hoffmann, Udo; Abbara, Suhny; Di Carli, Marcelo F.; DeFaria Yeh, Doreen; Landzberg, Michael Job; Liberthson, Richard R.; Blankstein, Ron (Oxford University Press (OUP), 2016)Aims The impact of coronary computed tomographic angiography (CTA) on management of anomalous origin of the coronary artery arising from the opposite sinus (ACAOS) remains uncertain. We examined the prevalence, anatomical ... -
Contrast inhomogeneity in CT angiography of the abdominal aortic aneurysm
George, Elizabeth; Giannopoulos, Andreas A.; Aghayev, Ayaz; Rohatgi, Saurabh; Imanzadeh, Amir; Antoniadis, Antonios P.; Kumamaru, Kanako; Chatzizisis, Yiannis; Dunne, Ruth Mary; Steigner, Michael L.; Hanley, Michael; Gravereaux, Edwin Charles; Rybicki, Frank; Mitsouras, Dimitrios (Elsevier BV, 2016)Background If undetected, infrarenal Abdominal Aortic Aneurysm (AAA) growth can lead to rupture, a high-mortality complication. Some AAA patients exhibit inhomogeneous luminal contrast attenuation at first-pass CT ... -
Cross-sectional imaging of aortic infections
Murphy, David John; Keraliya, Abhish; Agrawal, Mukta D; Aghayev, Ayaz; Steigner, Michael L. (Springer Nature, 2016)Aortic infections are uncommon clinical entities, but are associated with a high morbidity and mortality. In this review, we focus on the cross-sectional imaging appearances of aortic infections, including aortic valve ... -
CT Coronary Angiography: 256-Slice and 320-Detector Row Scanners
Hsiao, Edward M.; Rybicki, Frank; Steigner, Michael L. (Springer Nature, 2010)Multidetector computed tomography (MDCT) has rapidly evolved from 4-detector row systems in 1998 to 256-slice and 320-detector row CT systems. With smaller detector element size and faster gantry rotation speed, spatial ... -
Effect of Sleep Apnea and Continuous Positive Airway Pressure on Cardiac Structure and Recurrence of Atrial Fibrillation
Neilan, Tomas G.; Farhad, Hoshang; Dodson, John A.; Shah, Ravi V.; Abbasi, Siddique A.; Bakker, Jessie P.; Michaud, Gregory F.; van der Geest, Rob; Blankstein, Ron; Steigner, Michael; John, Roy M.; Jerosch‐Herold, Michael; Malhotra, Atul; Kwong, Raymond Y. (Blackwell Publishing Ltd, 2013)Background: Sleep apnea (SA) is associated with an increased risk of atrial fibrillation (AF). We sought to determine the effect of SA on cardiac structure in patients with AF, whether therapy for SA was associated with ... -
Feasibility study of electrocardiographic and respiratory gated, gadolinium enhanced magnetic resonance angiography of pulmonary veins and the impact of heart rate and rhythm on study quality
Groarke, John D; Waller, Alfonso H; Vita, Tomas S; Michaud, Gregory F; Di Carli, Marcelo F; Blankstein, Ron; Kwong, Raymond Y; Steigner, Michael (BioMed Central, 2014)Background: We aimed to assess the feasibility of 3 dimensional (3D) respiratory and ECG gated, gadolinium enhanced magnetic resonance angiography (MRA) on a 3 Tesla (3 T) scanner for imaging pulmonary veins (PV) and left ... -
The Incidence, Pattern, and Prognostic Value of Left Ventricular Myocardial Scar by Late Gadolinium Enhancement in Patients With Atrial Fibrillation
Neilan, Tomas G; Shah, Ravi Vikram; Abbasi, Siddique Akbar; Farhad, Hoshang; Groarke, John David; Dodson, John; Coelho-Filho, Otavio; McMullan, Ciaran Joseph; Heydari, Bobak; Michaud, Gregory F.; John, Roy Mattathu; van der Geest, Rob; Steigner, Michael L.; Blankstein, Ron; Jerosch-Herold, Michael; Kwong, Raymond Yan-Kit (Elsevier BV, 2013)Objectives We aimed to identify the frequency, pattern, and prognostic significance of left ventricular (LV) late gadolinium enhancement (LGE) in patients with atrial fibrillation (AF). Background There are limited ... -
Iodinated Contrast Opacification Gradients in Normal Coronary Arteries Imaged With Prospectively ECG-Gated Single Heart Beat 320-Detector Row Computed Tomography
Steigner, Michael L.; Mitsouras, Dimitrios; Whitmore, A. G.; Otero, H. J.; Wang, C.; Buckley, O.; Levit, N. A.; Hussain, A. Z.; Cai, Tianxi; Mather, R. T.; Smedby, O.; DiCarli, M. F.; Rybicki, F (Ovid Technologies (Wolters Kluwer Health), 2009)Background To define and evaluate coronary contrast opacification gradients using prospectively ECG-gated single heart beat 320-detector row coronary angiography (CTA). Methods and Results Thirty-six patients with ... -
Left Atrial Passive Emptying Function Determined by Cardiac Magnetic Resonance Predicts Atrial Fibrillation Recurrence After Pulmonary Vein Isolation
Dodson, J; Neilan, Tomas G; Shah, Ravi Vikram; Farhad, H.; Blankstein, Ron; Steigner, Michael L.; Michaud, Gregory F.; John, Roy Mattathu; Abbasi, Siddique Akbar; Jerosch-Herold, Michael; Kwong, Raymond Yan-Kit (Ovid Technologies (Wolters Kluwer Health), 2014)Background While pulmonary vein isolation (PVI) has become a mainstream therapy for selected patients with atrial fibrillation (AF), late recurrent AF is common and its risk factors remain poorly defined. The purpose ... -
Noninvasive Vascular Images for Face Transplant Surgical Planning
Soga, Shigeyoshi; Wake, Nicole; Bueno, Ericka; Steigner, Michael L.; Mitsouras, Dimitrios; Schultz, Kurt; Diaz-Siso, J. Rodrigo; Sisk, Geoffroy Courcelle; Prior, Richard; Powers, Sara L.; Signorelli, Jason; Jania, Camille K.; Pomahac, Bohdan; Rybicki, Frank (Open Science, 2011)Objective: Face transplantation replaces substantial defects with anatomically identical donor tissues; preoperative vascular assessment relies on noninvasive imaging to separate and characterize the external carotid vessels ... -
The “Post-64” Era of Coronary CT Angiography: Understanding New Technology from Physical Principles
Otero, Hansel J.; Steigner, Michael L.; Rybicki, Frank (Elsevier BV, 2009) -
Reduced exposure using asymmetric cone beam processing for wide area detector cardiac CT
Bedayat, Arash; Rybicki, Frank; Kumamaru, Kanako; Powers, Sara L.; Signorelli, Jason; Steigner, Michael L.; Steveson, Chloe; Soga, Shigeyoshi; Adams, Kimberly; Mitsouras, Dimitrios; Clouse, Melvin Eugene; Mather, Richard T. (Springer Nature, 2011)The purpose of this study was to estimate dose reduction after implementation of asymmetrical cone beam processing using exposure differences measured in a water phantom and a small cohort of clinical coronary CTA patients. ... -
Reduced Radiation Exposure for Face Transplant Surgical Planning Computed Tomography Angiography
Schultz, Kurt; George, Elizabeth; Mullen, Katherine M; Steigner, Michael L.; Mitsouras, Dimitrios; Bueno, Ericka; Pomahac, Bohdan; Rybicki, Frank John; Kumamaru, Kanako (Public Library of Science, 2013)Objective: To test the hypothesis that wide area detector face transplant surgical planning CT angiograms with simulated lower radiation dose and iterative reconstruction (AIDR3D) are comparable in image quality to those ... -
Risk Stratification by Regadenoson Stress Magnetic Resonance Imaging in Patients With Known or Suspected Coronary Artery Disease
Abbasi, Siddique Akbar; Heydari, Bobak; Shah, Ravi Vikram; Murthy, Venkatesh N.; Zhang, Ying-Yi; Blankstein, Ron; Steigner, Michael L.; Jerosch-Herold, Michael; Kwong, Raymond Yan-Kit (Elsevier BV, 2014)The aim of this study was to investigate the association between major adverse cardiovascular events (MACEs) and inducible ischemia on regadenoson cardiac magnetic resonance (CMR) myocardial perfusion imaging (MPI) performed ... -
Simulated 50 % radiation dose reduction in coronary CT angiography using adaptive iterative dose reduction in three-dimensions (AIDR3D)
Chen, Marcus Y.; Steigner, Michael L.; Leung, Steve W.; Kumamaru, Kanako K.; Schultz, Kurt; Mather, Richard T.; Arai, Andrew E.; Rybicki, Frank J. (Springer Netherlands, 2013)To compare the image quality of coronary CT angiography (CTA) studies between standard filtered back projection (FBP) and adaptive iterative dose reduction in three-dimensions (AIDR3D) reconstruction using CT noise additional ... -
Stress Cardiac Magnetic Resonance Imaging Provides Effective Cardiac Risk Reclassification in Patients With Known or Suspected Stable Coronary Artery Disease
Shah, Ravi Vikram; Heydari, B; Coelho-Filho, O.; Murthy, Venkatesh N.; Abbasi, Siddique Akbar; Feng, J. H.; Pencina, M.; Neilan, Tomas G; Meadows, J. L.; Francis, S; Blankstein, Ron; Steigner, Michael L.; Di Carli, Marcelo F.; Jerosch-Herold, Michael; Kwong, Raymond Yan-Kit (Ovid Technologies (Wolters Kluwer Health), 2013)Background A recent large-scale clinical trial found that an initial invasive strategy does not improve cardiac outcomes beyond optimized medical therapy in patients with stable coronary artery disease (CAD). Novel ... -
Superior Vena Cava Syndrome Associated with Right-to-Left Shunt through Systemic-to-Pulmonary Venous Collaterals
Juan, Yu-Hsiang; Saboo, Sachin S.; Anand, Vishal; Chatzizisis, Yiannis S.; Lin, Yu-Ching; Steigner, Michael L. (The Korean Society of Radiology, 2014)Superior vena cava (SVC) obstruction is associated with the gradual development of venous collaterals. We present a rare form of systemic-to-pulmonary subpleural collateral pathway that developed in the bridging subpleural ... -
Symptomatic coronary cameral fistula
Nagpal, Prashant; Khandelwal, Ashish; Saboo, SachinS; Garg, Gunjan; Steigner, Michael L. (Medknow, 2015)Coronary cameral fistula is a rare entity and is characterized by an abnormal communication between coronary artery and a cardiac chamber. It is usually congenital and asymptomatic in majority of patients. If symptomatic ... -
Tumor Encasement of the Right Coronary Artery: Role of Anatomic and Functional Imaging in Diagnosis and Therapeutic Management
Juan, Yu-Hsiang; Chatzizisis, Yiannis S; Saboo, Sachin S; Rocha, Tatiana; Steigner, Michael L (Bentham Open, 2014)We presented two rare cases of mediastinal tumor encasing the right coronary artery (RCA), one with recurrent metastatic thymoma and another with primary poorly differentiated neoplasm. Different degrees and locations of ...