A5006826322- Radiation Dose and Imaging
- Advanced X-ray and CT Imaging
- Cardiac Imaging and Diagnostics
- Medical Imaging Techniques and Applications
- Lung Cancer Diagnosis and Treatment
- Magnetic confinement fusion research
- Chronic Obstructive Pulmonary Disease (COPD) Research
- Radiomics and Machine Learning in Medical Imaging
- COVID-19 diagnosis using AI
- Dental Radiography and Imaging
- Advanced Radiotherapy Techniques
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Occupational and environmental lung diseases
- AI in cancer detection
- Electrical and Bioimpedance Tomography
- Air Quality and Health Impacts
- Nuclear Physics and Applications
- Radiology practices and education
- Plasma Diagnostics and Applications
- Cardiac Valve Diseases and Treatments
- Peripheral Artery Disease Management
- Coronary Interventions and Diagnostics
- Aortic aneurysm repair treatments
- Medical Image Segmentation Techniques
University Medical Center Utrecht
2010-2025
Utrecht University
2007-2019
Erasmus MC
2016
University Medical Center
2013-2015
University Hospital Heidelberg
2006-2010
Heidelberg University
2006-2010
Institute for Atomic and Molecular Physics
1998-2002
To assess radiation exposure due to CT in the Netherlands.Twenty-one hospitals participated a dose survey for 21 most frequently used protocols. Hospitals completed Web with detailed parameters one patient per protocol, including length product (DLP) from scanner report. Only standard-sized patients (1.74 m and 77 kg BMI 25.4 kg/m(2) ± 15 %) each protocol available were considered. Effective (E) was estimated using ICRP-103-based E/DLP coefficients. Dose levels compared surveys other...
Purpose To determine the intervendor variability of Agatston scoring determined with state-of-the-art computed tomographic (CT) systems from four major vendors in an ex vivo setup and to simulate subsequent effects on cardiovascular risk reclassification a large population-based cohort. Materials Methods Research ethics board approval was not necessary because cadaveric hearts individuals who donated their bodies science were used. scores obtained CT scanners different compared. Fifteen...
To reconstruct the first and last sections of a helical computed tomographic (CT) scan, scan length is automatically extended beyond planned image boundaries, phenomenon known as overranging. With common 16-section CT scanning protocols, overrange between 3 6 cm. For scanners with 64 or more sections, this will be much greater, since overranging increases pitch detector collimation increases. Manufacturers have equipped latest generation (128 more) dose-reducing innovations that reduce by...
We investigated the feasibility and extent to which iodine concentration can be reduced in computed tomography angiography imaging of aorta coronary arteries using low tube voltage virtual monochromatic 3 major dual-energy CT (DECT) vendors. A circulation phantom was imaged with dual source (DSCT), gemstone spectral (GSI) dual-layer detector (SDCT). For each scanner, a reference scan acquired at 120 kVp routine (300 mg I/ml). Subsequently, scans were lowest possible potential (70, 80, 80...
Recent experiments in the RTP tokamak have shown that electron temperature, Te, profile EC heated L mode discharges can only a small number of distinct shapes, depending on location additional heating. The sharp transitions between shapes are associated with loss or gain low rational q surface. These observations suggest thermal diffusivity χe is direct function safety factor q, alternating layers and high χe. It such model not excellently describes but also predicts other, observed so far...
Computed tomography (CT) has become the new reference standard for quantification of emphysema. The most popular measure emphysema derived from CT is pixel index (PI), which expresses fraction lung volume with abnormally low intensity values. As PI calculated a single, fixed threshold on intensity, this strongly influenced by noise. This effect shows up clearly when comparing score high-dose scan to low-dose (i.e., noisy) same subject. In paper, noise variance (NOVA) filter presented:...
Purpose:To retrospectively establish the minimum increase in emphysema score (ES) required for detection of real increased extent with 95% confidence by using multi–detector row computed tomography (CT) a lung cancer screening setting. Materials and Methods: The study was substudy NELSON project that approved Dutch Ministry Health ethics committee each participating hospital, patient informed consent. For this substudy, original approval consent allowed use data future research. Among 1684...
Hybrid and Model-Based Iterative Reconstruction Techniques for Pediatric CTAnnemarie M. den Harder1, Martin J. Willemink1, Ricardo P. Budde1, Arnold R. Schilham1, Tim Leiner1 Pim A. de Jong1Audio Available | Share
Objective We evaluated the effects of hybrid and model-based iterative reconstruction (IR) algorithms from different vendors at multiple radiation dose levels on image quality chest phantom scans. Methods A was scanned state-of-the-art computed tomography scanners 4 (4.1 mGy, 3.0 1.9 0.8 mGy). All data were reconstructed with filtered back projection (FBP) reduced-dose also IR (iDose4, Adaptive Iterative Dose Reduction 3D, Statistical Reconstruction, Sinogram-Affirmed prototype Model Veo)....
Spectral CT using a dual layer detector offers the possibility of retrospectively introducing spectral information to conventional images. In theory, dual-layer technology should not come with dose or image quality penalty for this study, we evaluate influence (IQon CT, Philips Healthcare) on images, by comparing these images those but otherwise technically comparable single-layer scanner (Brilliance iCT, Healthcare), means phantom experiments.For both scanners, were acquired four adult...
Computed tomography (CT) emphysema quantification is affected by both radiation dose (i.e. image noise) and reconstruction technique. At reduced dose, filtered back projection (FBP) results in an overestimation of the amount due to higher noise levels, while use iterative (IR) can result underestimation noise. The objective this study was determine influence reduction hybrid IR (HIR) or model-based (MIR) on CT quantification.Twenty-two patients underwent inspiratory chest scan at routine...