Moritz C. Halfmann

Photon-counting detector CT for prediction of valve dysfunction after transcatheter aortic valve implantation: Comparison with echocardiography

Sardi Hyska, José Osoria-Velasquez, Muhammad Taha Hagar, Gavin W. McCraw et autres

Background Noninvasive evaluation of suspected prosthetic valve dysfunction after transcatheter aortic valve implantation (TAVI) remains challenging because both anatomic and hemodynamic information are required for a conclusive diagnosis. Purpose To evaluate the diagnostic accuracy of hemodynamic parameters derived from time-resolved photon-counting detector …

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Spectral Black-Blood Photon-Counting CT for High-Resolution Carotid Vessel Wall Imaging

Adrienn Tóth, Muhammad Taha Hagar, Moritz C. Halfmann, Sardi Hyska et autres

OBJECTIVES: To evaluate the feasibility of a novel single-phase spectral black-blood CT (BBCT) technique for high-resolution carotid vessel wall imaging and explore its potential impact on plaque feature visualization. METHODS: In this IRB-approved retrospective study, clinically indicated head and neck photon-counting detector …

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Deep-learning denoising for ultrahigh-resolution photon-counting detector CT: phantom and in vivo evaluation of non-calcified coronary plaques

Sardi Hyska, Muhammad Taha Hagar, José Osoria-Velasquez, Nicola Fink et autres

To assess the value of convolutional neural network (CNN)-based denoising for the evaluation of non-calcified coronary plaques on ultrahigh-resolution (UHR) photon-counting detector (PCD) coronary CT angiography (CCTA). A dynamic phantom containing lipid-rich and fibrotic plaques with 50%-diameter stenosis (PDS) was scanned on …

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Added value of photon-counting CT for triple rule-out imaging: A propensity-matched comparison with energy-integrating CT

Sardi Hyska, M Vecsey-Nagy, Tilman Emrich, José Osoria-Velasquez et autres

Purpose To compare the technical performance of photon-counting detector (PCD)-CT and energy-integrating detector (EID)-CT in triple rule-out (TRO) imaging. Methods In this IRB-approved single-center study, consecutive TRO-CT patients underwent dual-source EID-CT or PCD-CT with 75 or 98.5 ​mL iopromide. Propensity score matching …

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Quantitative Vascular Enhancement Pipeline

Moritz C. Halfmann

Python workflow for automated, quality-control-aware quantification of vascular enhancement in CT.

Quantitative Vascular Enhancement Pipeline

Moritz C. Halfmann

Python workflow for automated, quality-control-aware quantification of vascular enhancement in CT.

Incremental value of deep learning denoising in low-dose coronary CT angiography in predominantly obese patients

José Osoria-Velasquez, Kathryn Byerly, Milán Vecsey-Nagy, Nicholas H. Shaheen et autres

OBJECTIVE: To determine the added value of post-hoc convolutional neural network (CNN)-based denoising for low-radiation coronary CT angiography (CCTA). METHODS: In this IRB-approved, post-hoc study, consecutive patients underwent clinically indicated CCTA on a third-generation dual-source CT scanner using a fast-pitch protocol and …

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Coronary artery calcium scoring: expanding the new standard by photon-counting detector CT—Part I: Impact of tube voltage, tube current, slice thickness, and quantum iterative reconstructions

Nicola Fink, Lennart R. Koetzier, Emese Zsarnóczay, Milán Vecsey-Nagy et autres

OBJECTIVES: Coronary artery calcium (CAC) scoring is a well-established method for cardiovascular risk assessment but has limited reproducibility. For energy-integrating detector (EID)-CT, a new, multivendor validated protocol has been proposed. This study aimed to investigate the variability of photon-counting detector (PCD)-CT-based CAC …

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Coronary artery calcium scoring: expanding the new standard by photon-counting detector CT Part II: Impact of virtual monoenergetic image reconstructions with adjusted calcium scoring thresholds

Nicola Fink, Lennart R. Koetzier, Emese Zsarnóczay, Milán Vecsey-Nagy et autres

OBJECTIVES: Part I of this study introduced a new photon-counting detector (PCD-)CT protocol for coronary artery calcium (CAC) scoring using 120 kVp, 75% dose, thin slices, quantum iterative reconstructions (IR) 2, leading to a significant reduction of score variability. The second part …

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Towards Personalized Scan Protocols For Ultra-high Resolution Photon-counting Coronary Ct Angiography: A Sex-based Analysis Of Image Quality

T. Emrich, Moritz C. Halfmann, Ákos Varga‐Szemes, Anton Kilburg et autres

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Reproducibility and Agreement of Three T1-Mapping Sequences for Myocardial Characterization at 3T in Healthy Volunteers

Tilman Emrich, Katharina Mader, Anton Kilburg, Moritz C. Halfmann et autres

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Towards Standardization of Flow Component Analysis: A 4D Flow CMR Study in Healthy Subjects

Tilman Emrich, Moritz C. Halfmann, Amir Ese, Anton Kilburg et autres

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