Dr. Dirk A. N. Vandenbroucke Profile

Dr. Dirk A. N. Vandenbroucke

Research Scientist at Agfa HealthCare NV

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Publications (6)

SPIE Journal Paper | 27 April 2021

On the relevance of modulation transfer function measurements in digital mammography quality control

Kristina Wigati, Nicholas Marshall, Kim Lemmens, Joke Binst, Annelies Jacobs, Lesley Cockmartin, Guozhi Zhang, Liesbeth Vancoillie, Dimitar Petrov, Dirk A. Vandenbroucke, Djarwani Soejoko, Hilde Bosmans

JMI, Vol. 8, Issue 02, 023505, (April 2021) https://doi.org/10.1117/12.10.1117/1.JMI.8.2.023505

KEYWORDS: Modulation transfer functions, Sensors, Switches, Image quality, Chromium, Gold, X-ray detectors, Systems modeling, Scintillators, Medical imaging

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Proceedings Article | 1 March 2019 Presentation + Paper

A case study on the impact of a reduction in MTF on test object detectability score in mammography

K. T. Wigati, H. Bosmans, L. Cockmartin, G. Zhang, L. Vancoillie, D. Petrov, D. A. Vandenbroucke, D. Soejoko, N. Marshall

Proceedings Volume 10948, 109480J (2019) https://doi.org/10.1117/12.2513285

KEYWORDS: Sensors, Chromium, Gold, Polymethylmethacrylate, Aluminum

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Proceedings Article | 13 March 2009 Paper

Can the evaluation of a simple test object be used to predict the performance of a contrast-detail analysis in digital mammography?

H. Bosmans, K. Lemmens, J. Jacobs, D. Vandenbroucke, F. Zanca, K. Michielsen, B. Verbrugge, K. Smans, G. Marchal

Proceedings Volume 7263, 726319 (2009) https://doi.org/10.1117/12.811752

KEYWORDS: Modulation transfer functions, Chromium, Digital mammography, Computing systems, Gold, Photon counting, Signal to noise ratio, Polymethylmethacrylate, Chest, Radiology

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The purpose was to find the correlation between a Figure of Merit (FoM) calculated from a new (simple) test object for Quality Control in digital mammography and CDMAM threshold thicknesses. The FoM included the signal difference to noise ratio, modulation transfer function of the complete system (including scatter and grid) and normalized noise power spectrum. The pre-programmed exposure settings for clinical work were used, as was done for the CDMAM acquisitions. The FoM is calculated from 2 images only (an image from the QC test object and an image of a corresponding homogeneous plate imaged with the same exposure settings). This FoM was evaluated in frequencies that match with the diameters of the gold disks in the CDMAM phantom. Computerized CDMAM analysis uses 16 images per system. The software program "cdcom" (www.euref.org) was used for the 4-AFC experiment. All matrices were averaged, smoothed with a Gaussian filter and psychometric curves were fitted through the correctly detected fractions to obtain the threshold thickness with a detectability of 62.5% for all diameters. Images have been acquired on 10 different systems (2 computed radiography (CR) systems, 6 direct radiology (DR) systems and 2 photon counting systems). The reproducibility of the QC metrics from images of the new phantom was assessed. The standard error on the mean of the FoM was for the highest frequency 8.1% for a CR system and 5.6% for a DR system. The main component in this error is due to the NNPS and the limited number of independent pixels used in this analysis. Parameters calculated from both phantoms are sensitive to variation in mean glandular dose levels. Present results show a weak correlation (R²=0.60) between the FoM at 5lp/mm and CDMAM threshold values for the 0.1mm objects when all system data are pooled. If evaluated for separate systems, the correlation holds promise for automated, periodic performance evaluations of digital mammography systems with the simplified phantom.

Proceedings Article | 6 May 2004 Paper

Measurement of correlated noise in images of computed radiography systems and its influence on the detective quantum efficiency

Hartmut Illers, Dirk Vandenbroucke, Egbert Buhr

Proceedings Volume 5368, (2004) https://doi.org/10.1117/12.535807

KEYWORDS: Chromium, Sensors, Image segmentation, Spatial frequencies, X-rays, Luminescence, Radiography, Image analysis, Quantum efficiency, Computing systems

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Proceedings Article | 6 May 2004 Paper

Threshold contrast visibility of microcalcifications in digital mammography

Ann-Katherine Carton, Hilde Bosmans, Dirk Vandenbroucke, Chantal Van Ongeval, Geert Souverijns, Frank Rogge, Guy Marchal

Proceedings Volume 5368, (2004) https://doi.org/10.1117/12.536298

KEYWORDS: Sensors, X-rays, Aluminum, X-ray detectors, Particles, Mammography, Polymethylmethacrylate, Modulation transfer functions, Digital mammography, Visibility

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Proceedings Article | 3 May 2002 Paper

Practical method for detected quantum efficiency (DQE) assessment of digital mammography systems in the radiological environment

Frank Rogge, Dirk Vandenbroucke, Luc Struye, Hilde Bosmans, Peter Willems, Guy Marchal

Proceedings Volume 4682, (2002) https://doi.org/10.1117/12.465609

KEYWORDS: Modulation transfer functions, Sensors, X-rays, Digital mammography, Signal attenuation, Quantum efficiency, X-ray detectors, Data modeling, Fourier transforms, Polymethylmethacrylate

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