Search results for: Julian L. Wichmann

Items from 1 to 20 out of 81 results

article

Modified calcium subtraction in dual-energy CT angiography of the lower extremity runoff: impact on diagnostic accuracy for stenosis detection

Domenico De Santis, Carlo N. De Cecco, U. Joseph Schoepf, John W. Nance, more

European Radiology > 2019 > 29 > 9 > 4783-4793

Objectives To investigate the diagnostic accuracy of a modified three-material decomposition calcium subtraction (CS) algorithm for the detection of arterial stenosis in dual-energy CT angiography (DE-CTA) of the lower extremity runoff compared to standard image reconstruction, using digital subtraction angiography (DSA) as the reference standard. Methods Eighty-eight patients (53 males; mean age,...

article

Single- and dual-energy CT pulmonary angiography using second- and third-generation dual-source CT systems: comparison of radiation dose and image quality

Lukas Lenga, Franziska Trapp, Moritz H. Albrecht, Julian L. Wichmann, more

European Radiology > 2019 > 29 > 9 > 4603-4612

Objectives To evaluate radiation exposure and image quality in matched patient cohorts for CT pulmonary angiography (CTPA) acquired in single- and dual-energy mode using second- and third-generation dual-source CT (DSCT) systems. Methods We retrospectively included 200 patients (mean age, 65.5 years ± 15.7 years) with suspected pulmonary embolism—equally divided into four study groups (n = 50) and...

article

Dual-energy CT in early acute pancreatitis: improved detection using iodine quantification

Simon S. Martin, Franziska Trapp, Julian L. Wichmann, Moritz H. Albrecht, more

European Radiology > 2019 > 29 > 5 > 2226-2232

Objectives To evaluate the diagnostic performance of a dual-energy computed tomography (DECT)-based technique using iodine quantification and fat fraction analysis for the diagnosis of early acute pancreatitis Methods In this retrospective study, 45 patients (35 men and 10 women; mean age, 54.9 ± 14.0 years) with early acute pancreatitis were included. Serum lipase levels and follow-up examinations...

article

Dual-energy CT in patients with colorectal cancer: Improved assessment of hypoattenuating liver metastases using noise-optimized virtual monoenergetic imaging

Lukas Lenga, Rouben Czwikla, Julian L. Wichmann, Doris Leithner, more

European Journal of Radiology > 2018 > 106 > C > 184-191

To assess the value of the noise-optimized virtual monoenergetic imaging (VMI+) technique on quantitative and qualitative image parameters in patients with hypoattenuating liver metastases from colorectal cancer (CRC) at abdominal dual-energy CT (DECT).Fifty-three consecutive patients (mean age, 70.3 ± 11.4 years; range, 44–86 years) with histologically proven, hypoattenuating liver metastases from...

article

Dual-Energy CT Pulmonary Angiography: Quantification of Disease Burden and Impact on Management

Simon S. Martin, Marly van Assen, L. Parkwood Griffith, Carlo N. De Cecco, more

Current Radiology Reports > 2018 > 6 > 10 > 1-8

Purpose of Review Computed tomography pulmonary angiography (CTPA) has become the imaging modality of choice for patients with suspected pulmonary embolism (PE). Post-processing techniques currently available for dual-energy CT pulmonary angiography (DE-CTPA) enhance image quality and provide additional value in the diagnosis of PE. The objective of this article is to summarize these recent developments...

article

Iodine quantification to distinguish hepatic neuroendocrine tumor metastasis from hepatocellular carcinoma at dual-source dual-energy liver CT

Benjamin Kaltenbach, Julian L. Wichmann, Sophia Pfeifer, Moritz H. Albrecht, more

European Journal of Radiology > 2018 > 105 > C > 20-24

To investigate the value of third-generation dual-source dual-energy computed tomography (DECT) iodine quantification to distinguish hepatic neuroendocrine tumor (NET) metastasis from hepatocellular carcinoma (HCC) in non-cirrhotic liver parenchyma.Forty-six patients (mean age, 64.9 ± 10.1 years; 28 male and 18 female) with either hepatic NET metastasis or HCC, who had undergone liver DECT, were included...

article

Indication of whole body computed tomography in pediatric polytrauma patients—Diagnostic potential of the Glasgow Coma Scale, the mechanism of injury and clinical examination

Claudia Frellesen, Daniel Klein, Patricia Tischendorf, Julian L. Wichmann, more

European Journal of Radiology > 2018 > 105 > C > 32-40

To evaluate the diagnostic potential of the Glasgow Coma Scale (GCS), the mechanism of injury (MOI) and clinical examination (CE) for the indication of whole body computed tomography (WBCT) in pediatric polytrauma patients.100 pediatric polytrauma patients with WBCT were analysed in terms of age, gender, (MOI), GCS, detected injury, FAST, CE and Injury Severity Score (ISS). Correlations between all...

article

Dual-energy CT-based iodine quantification to differentiate abdominal malignant lymphoma from lymph node metastasis

Simon S. Martin, Rouben Czwikla, Julian L. Wichmann, Moritz H. Albrecht, more

European Journal of Radiology > 2018 > 105 > C > 255-260

To investigate the value of dual-energy computed tomography (DECT)-derived iodine and fat quantification in differentiating malignant abdominal lymphoma from lymph node metastasis.In this retrospective study, 59 patients (39 men; mean age, 62.7 years) with histopathologically-confirmed diagnosis of either malignant lymphoma or lymph node metastasis were included. For each lesion, contrast-enhanced...

article

A noise-optimized virtual monoenergetic reconstruction algorithm improves the diagnostic accuracy of late hepatic arterial phase dual-energy CT for the detection of hypervascular liver lesions

Carlo N. De Cecco, Damiano Caruso, U. Joseph Schoepf, Domenico De Santis, more

European Radiology > 2018 > 28 > 8 > 3393-3404

Objectives To assess the image quality and diagnostic accuracy of a noise-optimized virtual monoenergetic imaging (VMI+) algorithm compared with standard virtual monoenergetic imaging (VMI) and linearly-blended (M_0.6) reconstructions for the detection of hypervascular liver lesions in dual-energy CT (DECT). Methods Thirty patients who underwent clinical liver MRI were prospectively enrolled. Within...

article

Using coronary CT angiography for guiding invasive coronary angiography: potential role to reduce intraprocedural radiation exposure

Christophe T. Arendt, Patricia Tischendorf, Julian L. Wichmann, Michael Messerli, more

European Radiology > 2018 > 28 > 7 > 2756-2762

Objectives We investigated the potential reduction of patient exposure during invasive coronary angiography (ICA) if the procedure had only been directed to the vessel with at least one ≥ 50% stenosis as described in the CT report. Methods Dose reports of 61 patients referred to ICA because of at least one ≥ 50% stenosis on coronary CT angiography (CCTA) were included. Dose–area product (DAP) was...

article

Evaluation of virtual monoenergetic imaging algorithms for dual-energy carotid and intracerebral CT angiography: Effects on image quality, artefacts and diagnostic performance for the detection of stenosis

Doris Leithner, Scherwin Mahmoudi, Julian L. Wichmann, Simon S. Martin, more

European Journal of Radiology > 2018 > 99 > C > 111-117

To investigate the impact of traditional (VMI) and noise-optimized virtual monoenergetic imaging (VMI+) algorithms on quantitative and qualitative image quality, and the assessment of stenosis in carotid and intracranial dual-energy CTA (DE-CTA).DE-CTA studies of 40 patients performed on a third-generation 192-slice dual-source CT scanner were included in this retrospective study. 120-kVp image-equivalent...

article

Impact of noise-optimized virtual monoenergetic dual-energy computed tomography on image quality in patients with renal cell carcinoma

Simon S. Martin, Julian L. Wichmann, Sophia Pfeifer, Doris Leithner, more

European Journal of Radiology > 2017 > 97 > C > 1-7

The aim of this study was to evaluate the impact of a noise-optimized virtual monoenergetic imaging (VMI+) reconstruction technique on image quality and lesion delineation in patients with renal cell carcinoma (RCC) undergoing abdominal dual-energy computed tomography (DECT).Fifty-two patients (33 men; 61.5±13.6years) with RCC underwent contrast-enhanced DECT during the corticomedullary and nephrogenic...

article

Acute kidney injury in patients with nephrotic syndrome undergoing contrast-enhanced CT for suspected venous thromboembolism: a propensity score-matched retrospective cohort study

Shu Min Tao, Xiang Kong, U. Joseph Schoepf, Julian L. Wichmann, more

European Radiology > 2018 > 28 > 4 > 1585-1593

Objectives To determine whether intravenous iodinated contrast material administration increases the risk of acute kidney injury (AKI) in patients with nephrotic syndrome undergoing contrast-enhanced CT. Methods Patients with nephrotic syndrome undergoing contrast-enhanced CT were retrospectively identified (n = 701). Control group consisted of patients with nephrotic syndrome receiving non-contrast...

article

Optimisation of window settings for traditional and noise-optimised virtual monoenergetic imaging in dual-energy computed tomography pulmonary angiography

Tommaso D’Angelo, Andreas M. Bucher, Lukas Lenga, Christophe T. Arendt, more

European Radiology > 2018 > 28 > 4 > 1393-1401

Objectives To define optimal window settings for displaying virtual monoenergetic images (VMI) of dual-energy CT pulmonary angiography (DE-CTPA). Methods Forty-five patients who underwent clinically-indicated third-generation dual-source DE-CTPA were retrospectively evaluated. Standard linearly-blended (M_0.6), 70-keV traditional VMI (M70), and 40-keV noise-optimised VMI (M40+) reconstructions were...

article

Accuracy of Noncontrast Quiescent-Interval Single-Shot Lower Extremity MR Angiography Versus CT Angiography for Diagnosis of Peripheral Artery Disease

Akos Varga-Szemes, Julian L. Wichmann, U. Joseph Schoepf, Pal Suranyi, more

JACC: Cardiovascular Imaging > 2017 > 10 > 10(PA) > 1116-1124

This study sought to evaluate the image quality and diagnostic accuracy of noncontrast quiescent-interval single-shot (QISS) magnetic resonance angiography (MRA) versus iodine-contrast computed tomography angiography (CTA) in patients with peripheral artery disease (PAD), with invasive digital subtraction angiography (DSA) as the reference standard.QISS is a recently introduced noncontrast MRA technique...

article

Dual-energy computed tomography in patients with cutaneous malignant melanoma: Comparison of noise-optimized and traditional virtual monoenergetic imaging

Simon S. Martin, Julian L. Wichmann, Hendrik Weyer, Moritz H. Albrecht, more

European Journal of Radiology > 2017 > 95 > C > 1-8

The aim of this study was to investigate the impact of noise-optimized virtual monoenergetic imaging (VMI+) reconstructions on quantitative and qualitative image parameters in patients with cutaneous malignant melanoma at thoracoabdominal dual-energy computed tomography (DECT).Seventy-six patients (48 men; 66.6±13.8years) with metastatic cutaneous malignant melanoma underwent DECT of the thorax and...

article

Evaluation of bone mineral density of the lumbar spine using a novel phantomless dual-energy CT post-processing algorithm in comparison with dual-energy X-ray absorptiometry

Christian Booz, Philipp C. Hofmann, Martin Sedlmair, Thomas G. Flohr, more

European Radiology Experimental > 2017 > 1 > 1 > 1-6

Background Current techniques for evaluation of bone mineral density (BMD) commonly require phantom calibration. The purpose of this study was to evaluate a novel algorithm for phantomless in vivo dual-energy computed tomography (DECT)-based assessment of BMD of the lumbar spine in comparison with dual-energy X-ray absorptiometry (DEXA). Methods Data from clinically indicated DECT and DEXA examinations...

article

Noise-Optimized Virtual Monoenergetic Dual-Energy CT Improves Diagnostic Accuracy for the Detection of Active Arterial Bleeding of the Abdomen

Simon S. Martin, Julian L. Wichmann, Jan-Erik Scholtz, Doris Leithner, more

Journal of Vascular and Interventional Radiology > 2017 > 28 > 9 > 1257-1266

To evaluate diagnostic accuracy of a noise-optimized virtual monoenergetic imaging (VMI+) reconstruction technique for detection of active arterial abdominal bleeding on dual-energy (DE) CT angiography compared with standard image reconstruction.DE CT angiography data sets of 71 patients (46 men; age 63.6 y ± 13.3) with suspected arterial bleeding of the abdomen or pelvis were reconstructed with standard...

article

Endoleaks after endovascular aortic aneurysm repair: Improved detection with noise-optimized virtual monoenergetic dual-energy CT

Simon S. Martin, Julian L. Wichmann, Hendrik Weyer, Jan-Erik Scholtz, more

European Journal of Radiology > 2017 > 94 > C > 125-132

To assess image quality and diagnostic performance of a noise-optimized algorithm to reconstruct virtual monoenergetic images (VMI+) for the detection of endoleaks after endovascular abdominal aortic aneurysm repair (EVAR) using dual-energy CT angiography (DE-CTA).Seventy-five patients (42 men; 66.2±11.7years) underwent DE-CTA following EVAR. Arterial phase images were acquired in dual-energy mode...

article

T(Rho) and magnetization transfer and INvErsion recovery (TRAMINER)‐prepared imaging: A novel contrast‐enhanced flow‐independent dark‐blood technique for the evaluation of myocardial late gadolinium enhancement in patients with myocardial infarction

Giuseppe Muscogiuri, Wolfgang G. Rehwald, U. Joseph Schoepf, Pal Suranyi, more

Journal of Magnetic Resonance Imaging > 45 > 5 > 1429 - 1437

Purpose To evaluate a new dark‐blood late gadolinium enhancement (LGE) technique called “T(Rho) And Magnetization transfer and INvErsion Recovery” (TRAMINER) for the ability to detect myocardial LGE versus standard “bright‐blood” inversion recovery (SIR) imaging. Materials and Methods This Institutional Review Board (IRB)‐approved, Health Insurance Portability and Accountability Act (HIPAA)‐compliant...

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Search results for: Julian L. Wichmann

Modified calcium subtraction in dual-energy CT angiography of the lower extremity runoff: impact on diagnostic accuracy for stenosis detection

Single- and dual-energy CT pulmonary angiography using second- and third-generation dual-source CT systems: comparison of radiation dose and image quality

Dual-energy CT in early acute pancreatitis: improved detection using iodine quantification

Dual-energy CT in patients with colorectal cancer: Improved assessment of hypoattenuating liver metastases using noise-optimized virtual monoenergetic imaging

Dual-Energy CT Pulmonary Angiography: Quantification of Disease Burden and Impact on Management

Iodine quantification to distinguish hepatic neuroendocrine tumor metastasis from hepatocellular carcinoma at dual-source dual-energy liver CT

Indication of whole body computed tomography in pediatric polytrauma patients—Diagnostic potential of the Glasgow Coma Scale, the mechanism of injury and clinical examination

Dual-energy CT-based iodine quantification to differentiate abdominal malignant lymphoma from lymph node metastasis

A noise-optimized virtual monoenergetic reconstruction algorithm improves the diagnostic accuracy of late hepatic arterial phase dual-energy CT for the detection of hypervascular liver lesions

Using coronary CT angiography for guiding invasive coronary angiography: potential role to reduce intraprocedural radiation exposure

Evaluation of virtual monoenergetic imaging algorithms for dual-energy carotid and intracerebral CT angiography: Effects on image quality, artefacts and diagnostic performance for the detection of stenosis

Impact of noise-optimized virtual monoenergetic dual-energy computed tomography on image quality in patients with renal cell carcinoma

Acute kidney injury in patients with nephrotic syndrome undergoing contrast-enhanced CT for suspected venous thromboembolism: a propensity score-matched retrospective cohort study

Optimisation of window settings for traditional and noise-optimised virtual monoenergetic imaging in dual-energy computed tomography pulmonary angiography

Accuracy of Noncontrast Quiescent-Interval Single-Shot Lower Extremity MR Angiography Versus CT Angiography for Diagnosis of Peripheral Artery Disease

Dual-energy computed tomography in patients with cutaneous malignant melanoma: Comparison of noise-optimized and traditional virtual monoenergetic imaging

Evaluation of bone mineral density of the lumbar spine using a novel phantomless dual-energy CT post-processing algorithm in comparison with dual-energy X-ray absorptiometry

Noise-Optimized Virtual Monoenergetic Dual-Energy CT Improves Diagnostic Accuracy for the Detection of Active Arterial Bleeding of the Abdomen

Endoleaks after endovascular aortic aneurysm repair: Improved detection with noise-optimized virtual monoenergetic dual-energy CT

T(Rho) and magnetization transfer and INvErsion recovery (TRAMINER)‐prepared imaging: A novel contrast‐enhanced flow‐independent dark‐blood technique for the evaluation of myocardial late gadolinium enhancement in patients with myocardial infarction

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