Search Results - "Graafen, Dirk"

Commercial AI solutions in detecting COVID-19 pneumonia in chest CT: not yet ready for clinical implementation? by Jungmann, Florian, Müller, Lukas, Hahn, Felix, Weustenfeld, Maximilian, Dapper, Ann-Kathrin, Mähringer-Kunz, Aline, Graafen, Dirk, Düber, Christoph, Schafigh, Darius, Pinto dos Santos, Daniel, Mildenberger, Peter, Kloeckner, Roman

“…Objectives In response to the COVID-19 pandemic, many researchers have developed artificial intelligence (AI) tools to differentiate COVID-19 pneumonia from…”
Get full text

Quantum iterative reconstruction on a photon-counting detector CT improves the quality of hepatocellular carcinoma imaging by Graafen, Dirk, Stoehr, Fabian, Halfmann, Moritz C, Emrich, Tilman, Foerster, Friedrich, Yang, Yang, Düber, Christoph, Müller, Lukas, Kloeckner, Roman

“…Excellent image quality is crucial for workup of hepatocellular carcinoma (HCC) in patients with liver cirrhosis because a signature tumor signal allows for…”
Get full text

Portal hypertension in patients with hepatocellular carcinoma and immunotherapy: prognostic relevance of CT-morphologic estimates by Müller, Lukas, Gairing, Simon J, Foerster, Friedrich, Weinmann, Arndt, Mittler, Jens, Stoehr, Fabian, Graafen, Dirk, Düber, Christoph, Galle, Peter R, Kloeckner, Roman, Hahn, Felix

“…Clinically significant portal hypertension (CSPH) has been identified as an important prognostic factor in patients with hepatocellular carcinoma (HCC)…”
Get full text

Magnetic resonance imaging of 1H long lived states derived from parahydrogen induced polarization in a clinical system by Graafen, Dirk, Franzoni, María Belén, Schreiber, Laura M., Spiess, Hans W., Münnemann, Kerstin

“…[Display omitted] •The hydrogenation of symmetric molecules with para-hydrogen is studied.•The 1H hyperpolarization is preserved as a long lived singlet…”
Get full text

Optimization of Kernel Type and Sharpness Level Improves Objective and Subjective Image Quality for High-Pitch Photon Counting Coronary CT Angiography by Yang, Yang, Fink, Nicola, Emrich, Tilman, Graafen, Dirk, Richter, Rosa, Bockius, Stefanie, Wolf, Elias V, Laux, Gerald, Kavermann, Larissa, Müller, Lukas, Hell, Michaela, Halfmann, Moritz C

“…(1) Background: Photon-counting detector (PCD) CT offers a wide variety of kernels and sharpness levels for image reconstruction. The aim of this retrospective…”
Get full text

Optimization of the Reconstruction Settings for Low-Dose Ultra-High-Resolution Photon-Counting Detector CT of the Lungs by Graafen, Dirk, Halfmann, Moritz C, Emrich, Tilman, Yang, Yang, Kreuter, Michael, Düber, Christoph, Kloeckner, Roman, Müller, Lukas, Jorg, Tobias

“…Photon-counting detector computed tomography (PCD-CT) yields improved spatial resolution. The combined use of PCD-CT and a modern iterative reconstruction…”
Get full text

In vitro and in vivo optimized reconstruction for low-keV virtual monoenergetic photon-counting detector CT angiography of lower legs by Graafen, Dirk, Bart, Willi, Halfmann, Moritz C., Müller, Lukas, Hobohm, Lukas, Yang, Yang, Neufang, Achim, Espinola-Klein, Christine, Pitton, Michael B., Kloeckner, Roman, Varga-Szemes, Akos, Emrich, Tilman

“…Background Lower extremity peripheral artery disease frequently presents with calcifications which reduces the accuracy of computed tomography (CT)…”
Get full text

Late-Onset Prosthetic Endocarditis with Paraaortic Abscess Caused by Cutibacterium acnes by Velollari, Ornela, Reinhardt, Christian Malte, Knorr, Maike, Schnitzler, Katharina, Graafen, Dirk, Miederer, Matthias, von Bardeleben, Ralph Stephan, Münzel, Thomas, Schmidt, Kai-Helge, Giebels, Christian, Schäfers, Hans-Joachim, Hobohm, Lukas

“…Cutibacterium acnes, an integral component of the skin’s customary bacterial flora, represents a Gram-positive anaerobic bacterium characterized by its low…”
Get full text

Quantitative contrast-enhanced myocardial perfusion magnetic resonance imaging: Simulation of bolus dispersion in constricted vessels by Graafen, Dirk, Münnemann, Kerstin, Weber, Stefan, Kreitner, Karl-Friedrich, Schreiber, Laura M.

“…Quantification of myocardial blood flow (MBF) by means of T 1 -weighted first-pass magnetic resonance imaging (MRI) requires knowledge of the arterial input…”
Get full text

Influence of coronary flow profiles on bolus shape and quantitative myocardial perfusion MRI by Graafen, Dirk, Hamer, Julia, Schmidt, Regine, Schmitt, Melanie, Weber, Stefan, Schreiber, Laura M

“…Unexpectedly, stenosis results in less bolus dispersion than that observed in the healthy situation. [...] it may be speculated that blood flow estimates in…”
Get full text

Dose Reduction and Image Quality in Photon-counting Detector High-resolution Computed Tomography of the Chest: Routine Clinical Data by Graafen, Dirk, Emrich, Tilman, Halfmann, Moritz C., Mildenberger, Peter, Düber, Christoph, Yang, Yang, Othman, Ahmed E., O’ Doherty, Jim, Müller, Lukas, Kloeckner, Roman

“…Photon-counting detector computed tomography (PCD-CT) has the potential to significantly improve CT imaging in many ways including, but not limited to,…”
Get full text

Ultrahigh-Spatial-Resolution Photon-counting Detector CT Angiography of Coronary Artery Disease for Stenosis Assessment by Halfmann, Moritz C, Bockius, Stefanie, Emrich, Tilman, Hell, Michaela, Schoepf, U Joseph, Laux, Gerald S, Kavermann, Larissa, Graafen, Dirk, Gori, Tomasso, Yang, Yang, Kloeckner, Roman, Maurovich-Horvat, Pál, Ricke, Jens, Müller, Lukas, Varga-Szemes, Akos, Fink, Nicola

“…Background Coronary CT angiography is a first-line test in coronary artery disease but is limited by severe calcifications. Photon-counting-detector (PCD) CT…”
Get more information

Extent of portal vein tumour thrombosis in patients with hepatocellular carcinoma: The more, the worse? by Mähringer‐Kunz, Aline, Steinle, Verena, Düber, Christoph, Weinmann, Arndt, Koch, Sandra, Schmidtmann, Irene, Schotten, Sebastian, Hinrichs, Jan B., Graafen, Dirk, Pinto dos Santos, Daniel, Galle, Peter R., Kloeckner, Roman

“…Background & Aims Portal vein tumour thrombosis (PVTT) has a significant impact on the prognosis of patients with hepatocellular carcinoma (HCC). The degree of…”
Get full text

A multidisciplinary pulmonary embolism response team (PERT): first experience from a single center in Germany by Sagoschen, Ingo, Scibior, Barbara, Farmakis, Ioannis T., Keller, Karsten, Graafen, Dirk, Griemert, Eva-Verena, Vosseler, Markus, Treede, Hendrik, Münzel, Thomas, Knorr, Maike, Gori, Tommaso, Konstantinides, Stavros, Hobohm, Lukas

“…Background Over the last few years, the concept of multidisciplinary pulmonary embolism response teams (PERTs) has emerged to encounter the increasing variety…”
Get full text

Ultra-high resolution coronary CT angiography on photon-counting detector CT: bi-centre study on the impact of quantum iterative reconstruction on image quality and accuracy of stenosis measurements by Vecsey-Nagy, Milan, Varga-Szemes, Akos, Schoepf, U. Joseph, Tremamunno, Giuseppe, Fink, Nicola, Zsarnoczay, Emese, Szilveszter, Bálint, Graafen, Dirk, Halfmann, Moritz C, Vattay, Borbála, Boussoussou, Melinda, O’Doherty, Jim, Suranyi, Pal Spruill, Maurovich-Horvat, Pál, Emrich, Tilman

“…•Ultrahigh-resolution PCD-CT produces images with inherently higher noise level.•QIR reduces noise without affecting image texture.•QIR does not compromise…”
Get full text

Magnetic resonance imaging of (1)H long lived states derived from parahydrogen induced polarization in a clinical system by Graafen, Dirk, Franzoni, María Belén, Schreiber, Laura M, Spiess, Hans W, Münnemann, Kerstin

“…Hyperpolarization is a powerful tool to overcome the low sensitivity of nuclear magnetic resonance (NMR). However, applications are limited due to the short…”
Get full text

Dose Reduction and Image Quality in Photon-counting Detector High-resolution Computed Tomography of the Chest: Routine Clinical Data by Graafen, Dirk, Emrich, Tilman, Halfmann, Moritz C., Mildenberger, Peter, Düber, Christoph, Yang, Yang, Othman, Ahmed E., O’ Doherty, Jim, Müller, Lukas, Kloeckner, Roman

Get full text

Magnetic resonance imaging of super(1)H long lived states derived from parahydrogen induced polarization in a clinical system by Graafen, Dirk, Franzoni, Maria Belen, Schreiber, Laura M, Spiess, Hans W, Muennemann, Kerstin

“…Hyperpolarization is a powerful tool to overcome the low sensitivity of nuclear magnetic resonance (NMR). However, applications are limited due to the short…”
Get full text

Contrast Agent Bolus Dispersion in a Realistic Coronary Artery Geometry: Influence of Outlet Boundary Conditions by Sommer, Karsten, Schmidt, Regine, Graafen, Dirk, Breit, Hanns-Christian, Schreiber, Laura M.

“…Myocardial blood flow (MBF) quantification using contrast-enhanced first-pass magnetic resonance imaging relies on the precise knowledge of the arterial input…”
Get full text

Quantitative myocardial perfusion magnetic resonance imaging: the impact of pulsatile flow on contrast agent bolus dispersion by Graafen, Dirk, Hamer, Julia, Weber, Stefan, Schreiber, Laura M

“…Myocardial blood flow (MBF) can be quantified using T1-weighted first-pass magnetic resonance imaging (MRI) in combination with a tracer-kinetic model, like…”
Get more information