Search results for: Paul Apfaltrer

Items from 1 to 20 out of 33 results

article

Objective and subjective comparison of virtual monoenergetic vs. polychromatic images in patients with pancreatic ductal adenocarcinoma

Lucian Beer, Michael Toepker, Ahmed Ba-Ssalamah, Christian Schestak, more

European Radiology > 2019 > 29 > 7 > 3617-3625

Objectives The aim of this study was to assess the objective and subjective image characteristics of monoenergetic images (MEI[+]), using a noise-optimized algorithm at different kiloelectron volts (keV) compared to polyenergetic images (PEI), in patients with pancreatic ductal adenocarcinoma (PDAC). Methods This retrospective, institutional review board-approved study included 45 patients (18 male,...

article

Dual-energy CT and ceramic or titanium prostheses material reduce CT artifacts and provide superior image quality of total knee arthroplasty

Maximilian F. Kasparek, Michael Töpker, Mathias Lazar, Michael Weber, more

Knee Surgery, Sports Traumatology, Arthroscopy > 2019 > 27 > 5 > 1552-1561

Purpose To evaluate the influence of different scan parameters for single-energy CT and dual-energy CT, as well as the impact of different material used in a TKA prosthesis on image quality and the extent of metal artifacts. Methods Eight pairs of TKA prostheses from different vendors were examined in a phantom set-up. Each pair consisted of a conventional CoCr prosthesis and the corresponding anti-allergic...

article

CT colonography: size reduction of submerged colorectal polyps due to electronic cleansing and CT-window settings

Christian Bräuer, Philippe Lefere, Stefaan Gryspeerdt, Helmut Ringl, more

European Radiology > 2018 > 28 > 11 > 4766-4774

Objectives To assess whether electronic cleansing (EC) of tagged residue and different computed tomography (CT) windows influence the size of colorectal polyps in CT colonography (CTC). Methods A database of 894 colonoscopy-validated CTC datasets of a low-prevalence cohort was retrospectively reviewed to identify patients with polyps ≥6 mm that were entirely submerged in tagged residue. Ten radiologists...

article

High-pitch low-voltage CT coronary artery calcium scoring with tin filtration: accuracy and radiation dose reduction

Georg Apfaltrer, Moritz H. Albrecht, U. Joseph Schoepf, Taylor M. Duguay, more

European Radiology > 2018 > 28 > 7 > 3097-3104

Objectives To investigate diagnostic accuracy and radiation dose of high-pitch CT coronary artery calcium scoring (CACS) with tin filtration (Sn100kVp) versus standard 120kVp high-pitch acquisition. Methods 78 patients (58% male, 61.5±9.1 years) were prospectively enrolled. Subjects underwent clinical 120kVp high-pitch CACS using third-generation dual-source CT followed by additional high-pitch...

article

Predictive value of perfusion defects on dual energy CTA in the absence of thromboembolic clots

Richard A.P. Takx, Thomas Henzler, U. Joseph Schoepf, Thomas Germann, more

Journal of Cardiovascular Computed Tomography > 2017 > 11 > 3 > 183-187

To determine the predictive value of volumetrically measured lung perfusion defects (PDvol) and right ventricular dysfunction on dual-energy computed tomography angiography (DE-CTA) for predicting all cause mortality in patients suspected of pulmonary embolism (PE) but without evident thromboembolic clot on CTA.448 patients underwent DE-CTA on a 64-channel DSCT system between January 2007 and December...

article

Impact on Image Quality and Radiation Dose of Third-Generation Dual-Source Computed Tomography of the Coronary Arteries

Georg Apfaltrer, Dieter H. Szolar, Eric Wurzinger, Richard A.P. Takx, more

The American Journal of Cardiology > 2017 > 119 > 8 > 1156-1161

The aim of this study was to assess the image quality (IQ) and radiation dose of third-generation dual-source computed tomography (CT) coronary angiography (cCTA) in comparison with 64-slice single-source CT. This retrospective study included 140 patients (73 men, mean age 62 ± 11 years) with low-to-intermediate probability of coronary artery disease who underwent either third-generation dual-source...

article

Coronary artery calcium in breast cancer survivors after radiation therapy

Richard A. P. Takx, Rozemarijn Vliegenthart, U. Joseph Schoepf, Lothar R. Pilz, more

The International Journal of Cardiovascular Imaging > 2017 > 33 > 9 > 1425-1431

The purpose of the current study is to investigate whether breast cancer survivors after radiation therapy have a higher burden of coronary artery calcium as a potential surrogate of radiation-induced accelerated coronary artery disease. 333 patients were included. 54 patients underwent chest CT ≥ 6 months after the start of radiation therapy (radiation therapy group), while 279 patients had a CT...

article

Prognostic value of CT-derived left atrial and left ventricular measures in patients with acute chest pain

Richard A.P. Takx, Rozemarijn Vliegenthart, U. Joseph Schoepf, John W. Nance, more

European Journal of Radiology > 2017 > 86 > C > 163-168

To determine which left atrial (LA) and left ventricular (LV) parameters are associated with future major adverse cardiac event (MACE) and whether these measurements have independent prognostic value beyond risk factors and computed tomography (CT)-derived coronary artery disease measures.This retrospective analysis was performed under an IRB waiver and in HIPAA compliance. Subjects underwent coronary...

article

Low-tube-voltage selection for triple-rule-out CTA: relation to patient size

Richard A. P. Takx, Radko Krissak, Christian Fink, Valentin Bachmann, more

European Radiology > 2017 > 27 > 6 > 2292-2297

Objectives To investigate the relationship between image quality and patient size at 100 kilovoltage (kV) compared to 120 kV ECG-gated Triple-Rule-Out CT angiography (TRO-CTA). Methods We retrospectively included 73 patients (age 64 ± 14 years) who underwent retrospective ECG-gated chest CTA. 40 patients were scanned with 100 kV while 33 patients with 120 kV. Body mass index (BMI), patients’ chest...

article

Computed Tomography–Derived Parameters of Myocardial Morphology and Function in Black and White Patients With Acute Chest Pain

Richard A.P. Takx, Rozemarijn Vliegenthart, U. Joseph Schoepf, Joseph A. Abro, more

The American Journal of Cardiology > 2016 > 117 > 3 > 333-339

Blacks have higher mortality and hospitalization rates because of congestive heart failure compared with white counterparts. Differences in cardiac structure and function may contribute to the racial disparity in cardiovascular outcomes. Our aim was to compare computed tomography (CT)–derived cardiac measurements between black patients with acute chest pain and age- and gender-matched white patients...

article

Dual-energy snap-shot perfusion CT in suspect pulmonary nodules and masses and for lung cancer staging

Sonja Sudarski, Claudia Hagelstein, Meike Weis, Stefan O. Schoenberg, more

European Journal of Radiology > 2015 > 84 > 12 > 2393-2400

Dual energy computed tomography (DECT) has proven its clinical usefulness for improved tissue characterization within the past years. In thoracic oncology, DECT can be used to differentiate between benign and malignant pulmonary nodules and masses. In patients with known lung cancer, DECT can add incremental functional information to staging scans, therapeutic response evaluation, as well as to the...

article

An Analysis in Patients with Gastrointestinal Stromal Tumor

Sonja Sudarski, Paul Apfaltrer, John W. Nance, Mathias Meyer, more

Academic Radiology > 2014 > 21 > 4 > 514-522

To compare in dual-energy CT (DECT) conventionally reconstructed polyenergetic images (PEI) at 120 kVp to virtual monoenergetic images (MEI) at different kiloelectron volt (keV) levels for evaluation of liver and gastrointestinal stromal tumor (GIST) hepatic metastases with regard to objective (IQob) and subjective image quality (IQsub) assessed by two readers of varying experience. Image quality...

article

Optimization of Kiloelectron Volt Settings in Cerebral and Cervical Dual-energy CT Angiography Determined with Virtual Monoenergetic Imaging

David Schneider, Paul Apfaltrer, Sonja Sudarski, John W. Nance, more

Academic Radiology > 2014 > 21 > 4 > 431-436

Dual-energy computed tomography (DECT) offers various fields of application, especially in angiography using virtual monoenergetic imaging. The aim of this study was to evaluate objective image quality indices of calculated low–kiloelectron volt monoenergetic DECT angiographic cervical and cerebral data sets compared to virtual 120-kV polyenergetic images.Forty-one patients (21 men, mean age 58 ± 14)...

article

Comparison of the Effect of Iterative Reconstruction versus Filtered Back Projection on Cardiac CT Postprocessing

J. Reid Spears, U. Joseph Schoepf, Thomas Henzler, Gayatri Joshi, more

Academic Radiology > 2014 > 21 > 3 > 318-324

To investigate the impact of iterative reconstruction in image space (IRIS) on image noise, image quality (IQ), and postprocessing at coronary computed tomography angiography (cCTA) compared to traditional filtered back-projection (FBP).The cCTA results of 50 patients (26 men; 58 ± 15 years, body mass index 31.5 ± 6.7 kg/m²) were investigated using a second-generation dual-source computed tomography...

article

Comparison of Epicardial Fat Volume by Computed Tomography in Black Versus White Patients With Acute Chest Pain

Paul Apfaltrer, Andreas Schindler, U. Joseph Schoepf, John W. Nance, more

The American Journal of Cardiology > 2014 > 113 > 3 > 422-428

Disparities in the risk of coronary artery disease (CAD) between races may be influenced by differences in the thoracic adipose tissue. We compared computed tomography (CT)–derived volumes of epicardial adipose tissue (EAT), mediastinal adipose tissue (MAT), and pericoronary fat thickness (PFT) and correlations with CAD between black and white patients. This institutional review board–approved Health...

article

Value of monoenergetic low-kV dual energy CT datasets for improved image quality of CT pulmonary angiography

Paul Apfaltrer, Sonja Sudarski, David Schneider, John W. Nance, more

European Journal of Radiology > 2014 > 83 > 2 > 322-328

High vessel attenuation and high contrast-to-noise ratio (CNR) are prerequisites for high diagnostic confidence in CT pulmonary angiography (CTPA). This study evaluated the impact of calculated monoenergetic dual-energy (DE) CTPA datasets on vessel attenuation and CNR.50 Patients (24 men, mean age 68±14 years) who underwent DE-CTPA were retrospectively included in this study. The 80 and 140-kV DE...

article

Automated Quantification of Epicardial Adipose Tissue Using CT Angiography: Evaluation of a Prototype Software

James V. Spearman, Felix G. Meinel, U. Joseph Schoepf, Paul Apfaltrer, more

European Radiology > 2014 > 24 > 2 > 519-526

Objectives This study evaluated the performance of a novel automated software tool for epicardial fat volume (EFV) quantification compared to a standard manual technique at coronary CT angiography (cCTA). Methods cCTA data sets of 70 patients (58.6 ± 12.9 years, 33 men) were retrospectively analysed using two different post-processing software applications. Observer 1 performed a manual single-plane...

article

Dynamic volume perfusion CT in patients with lung cancer: Baseline perfusion characteristics of different histological subtypes

Jingyun Shi, Gerald Schmid-Bindert, Christian Fink, Sonja Sudarski, more

European Journal of Radiology > 2013 > 82 > 12 > e894-e900

To evaluate dynamic volume perfusion CT (dVPCT) tumor baseline characteristics of three different subtypes of lung cancer in untreated patients.173 consecutive patients (131 men, 42 women; mean age 61±10 years) with newly diagnosed lung cancer underwent dVPCT prior to biopsy. Tumor permeability, blood flow (BF), blood volume (BV) and mean transit time (MTT) were quantitatively assessed as well as...

article

Optimization of keV-settings in abdominal and lower extremity dual-source dual-energy CT angiography determined with virtual monoenergetic imaging

Sonja Sudarski, Paul Apfaltrer, John W. Nance, David Schneider, more

European Journal of Radiology > 2013 > 82 > 10 > e574-e581

To compare objective image quality indices in dual-energy CT angiography (DE-CTA) studies of the abdomen and lower extremity using conventional polyenergetic images (PEIs) and virtual monoenergetic images (MEIs) at different kiloelectron volt (keV) levels.We retrospectively evaluated 68 dual-source DE-CTA studies. 50 patients (42 men, 71±10 years) underwent abdominal DE-CTA. 18 patients (13 men, 67±10...

article

Atherosclerotic plaque burden in cocaine users with acute chest pain: Analysis by coronary computed tomography angiography

Ullrich Ebersberger, Sonja Sudarski, U. Joseph Schoepf, Fabian Bamberg, more

Atherosclerosis > 2013 > 229 > 2 > 443-448

Chest pain associated with cocaine use represents an increasing problem in the emergency department (ED). Cocaine use has been linked to the acute coronary syndrome (ACS) and acute myocardial infarction (AMI). We used coronary computed tomography angiography (cCTA) to evaluate the prevalence, severity and composition of atherosclerotic lesions in cocaine users. We studied 78 patients with non-occasional...

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Search results for: Paul Apfaltrer

Objective and subjective comparison of virtual monoenergetic vs. polychromatic images in patients with pancreatic ductal adenocarcinoma

Dual-energy CT and ceramic or titanium prostheses material reduce CT artifacts and provide superior image quality of total knee arthroplasty

CT colonography: size reduction of submerged colorectal polyps due to electronic cleansing and CT-window settings

High-pitch low-voltage CT coronary artery calcium scoring with tin filtration: accuracy and radiation dose reduction

Predictive value of perfusion defects on dual energy CTA in the absence of thromboembolic clots

Impact on Image Quality and Radiation Dose of Third-Generation Dual-Source Computed Tomography of the Coronary Arteries

Coronary artery calcium in breast cancer survivors after radiation therapy

Prognostic value of CT-derived left atrial and left ventricular measures in patients with acute chest pain

Low-tube-voltage selection for triple-rule-out CTA: relation to patient size

Computed Tomography–Derived Parameters of Myocardial Morphology and Function in Black and White Patients With Acute Chest Pain

Dual-energy snap-shot perfusion CT in suspect pulmonary nodules and masses and for lung cancer staging

An Analysis in Patients with Gastrointestinal Stromal Tumor

Optimization of Kiloelectron Volt Settings in Cerebral and Cervical Dual-energy CT Angiography Determined with Virtual Monoenergetic Imaging

Comparison of the Effect of Iterative Reconstruction versus Filtered Back Projection on Cardiac CT Postprocessing

Comparison of Epicardial Fat Volume by Computed Tomography in Black Versus White Patients With Acute Chest Pain

Value of monoenergetic low-kV dual energy CT datasets for improved image quality of CT pulmonary angiography

Automated Quantification of Epicardial Adipose Tissue Using CT Angiography: Evaluation of a Prototype Software

Dynamic volume perfusion CT in patients with lung cancer: Baseline perfusion characteristics of different histological subtypes

Optimization of keV-settings in abdominal and lower extremity dual-source dual-energy CT angiography determined with virtual monoenergetic imaging

Atherosclerotic plaque burden in cocaine users with acute chest pain: Analysis by coronary computed tomography angiography

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