Mr. Tom Bruijns Profile

Tom Bruijns

X-Ray Imaging Scientist at Philips Medical Systems International BV

SPIE Involvement:

Author

Proceedings Article | 24 February 2012 Paper

Model-based blood flow quantification from DSA: quantitative evaluation on patient data and comparison with TCCD

I. Waechter-Stehle, A. Groth, T. Bruijns, O. Brina, D. Ruefenacht, Z. Kulcsar, V. Mendes-Pereira, F. Perren, D. Hawkes, J. Weese

Proceedings Volume 8314, 83144R (2012) https://doi.org/10.1117/12.911095

KEYWORDS: Blood circulation, X-rays, Angiography, Data modeling, Model-based design, Toxic industrial chemicals, Wave propagation, Wavefronts, 3D modeling, Reliability

Read Abstract +

Proceedings Article | 2 March 2011 Paper

Clinical study of model-based blood flow quantification on cerebrovascular data

A. Groth, I. Wächter-Stehle, O. Brina, F. Perren, V. Mendes-Pereira, D. Rüfenacht, T. Bruijns, M. Bertram, J. Weese

Proceedings Volume 7964, 79640X (2011) https://doi.org/10.1117/12.877148

KEYWORDS: Blood circulation, Data modeling, Angiography, Model-based design, Arteries, Doppler effect, Blood, Data acquisition, Ultrasonography, Toxic industrial chemicals

Read Abstract +

Proceedings Article | 5 June 2003 Paper

Image quality of digital radiography using flat detector technology

Thierry Ducourant, David Couder, Thibaut Wirth, J. Trochet, Raoul Bastiaens, Tom Bruijns, Hans Luijendijk, Bernhard Sandkamp, Andrew Davies, Dominique Didier, Agustin Gonzalez, Sylvain Terraz, Daniel Ruefenacht

Proceedings Volume 5030, (2003) https://doi.org/10.1117/12.479969

KEYWORDS: Sensors, Image quality, Fluoroscopy, X-rays, Angiography, Visibility, Photodiodes, Modulation transfer functions, Switching, Bone

Read Abstract +

One of the most demanding applications in dynamic X-Ray imaging is Digital Subtraction Angiography (DSA). As opposed to other applications such as Radiography or Fluoroscopy, there has been so far limited attempts to introduce DSA with flat detector (FD) technology: Up to now, only part of the very demanding requirements could be taken into account. In order to enable an introduction of FD technology also in this area, a complete understanding of all physical phenomena related to the use of this technology in DSA is necessary. This knowledge can be used for detector design and performance optimization. Areas of research include fast switching between several detector operating modes (e.g. switching between fluoroscopy and high dose exposure modes and vice versa) and non stability during the DSA run e.g. due to differences in gain between subsequent images. Furthermore, effects of local and global X-Ray overexposure (due to direct radiation), which can cause temporal artifacts such as ghosting, may have a negative impact on the image quality. Pixel shift operations and image subtraction enhance the visibility of any artifact. The use of a refresh light plays an important role in the optimization process. Both an 18x18 cm² as well as a large area 30x40 cm² flat panel detector are used for studying the various phenomena. Technical measurements were obtained using complex imaging sequences representing the most demanding application conditions. Studies on subtraction test objects were performed and vascular applications have been carried out in order to confirm earlier findings. The basis for comparison of DSA is, still, the existing and mature IITV technology. The results of this investigation show that the latest generation of dynamic flat detectors is capable of handling this kind of demanding application. Not only the risk areas and their solutions and points of attention will be addressed, but also the benefits of present FD technology with respect to state-of-the-art IITV technology regarding DSA will be discussed.

Proceedings Article | 3 May 2002 Paper

Image quality of a large-area dynamic flat detector: comparison with a state-of-the-art II/TV system

Tom Bruijns, Raoul Bastiaens, Bart Hoornaert, Eric von Reth, Falko Busse, Volker Heer, Thierry Ducourant, Arnold Cowen, Andrew Davies, Francois Terrier

Proceedings Volume 4682, (2002) https://doi.org/10.1117/12.465574

KEYWORDS: Sensors, Image quality, X-rays, Imaging systems, Fluoroscopy, Modulation transfer functions, X-ray imaging, Image intensifiers, Radiography, CCD cameras

Read Abstract +

Proceedings Article | 25 April 2000 Paper

Simulation of the image quality of an a-Si flat x-ray detector system in low-dose fluoroscopic applications

Tom Bruijns, Thijs Adriaansz, Arnold Cowen, Andrew Davies, Stephen Kengyelics, Kourosh Kiani, Han Kroon, Hans Luijendijk

Proceedings Volume 3977, (2000) https://doi.org/10.1117/12.384484

KEYWORDS: X-rays, Sensors, Image quality, X-ray imaging, Interference (communication), X-ray detectors, Signal to noise ratio, Fluoroscopy, Imaging systems, Calibration

Read Abstract +

Proceedings Article | 28 May 1999 Paper

Technical and clinical assessments of an experimental flat dynamic x-ray image detector system

Tom Bruijns, Robert Bury, Falko Busse, Andrew Davies, Arnold Cowen, Walter Ruetten, Hans Reitsma

Proceedings Volume 3659, (1999) https://doi.org/10.1117/12.349507

KEYWORDS: Sensors, Image quality, X-ray imaging, X-rays, Signal to noise ratio, X-ray detectors, Imaging systems, Image enhancement, Spatial frequencies, Fluoroscopy

Read Abstract +

Proceedings Article | 24 May 1999 Paper

Psychophysical evaluation of the image quality of a dynamic flat-panel digital x-ray image detector using the threshold contrast detail detectability (TCDD) technique

Andrew Davies, Arnold Cowen, Tom Bruijns

Proceedings Volume 3663, (1999) https://doi.org/10.1117/12.349639

KEYWORDS: Sensors, Fluoroscopy, Imaging systems, Image quality, X-ray detectors, X-rays, Denoising, X-ray imaging, Image processing, Cameras

Read Abstract +

We are currently in an era of active development of the digital X-ray imaging detectors that will serve the radiological communities in the new millennium. The rigorous comparative physical evaluations of such devices are therefore becoming increasingly important from both the technical and clinical perspectives. The authors have been actively involved in the evaluation of a clinical demonstration version of a flat-panel dynamic digital X-ray image detector (or FDXD). Results of objective physical evaluation of this device have been presented elsewhere at this conference. The imaging performance of FDXD under radiographic exposure conditions have been previously reported, and in this paper a psychophysical evaluation of the FDXD detector operating under continuous fluoroscopic conditions is presented. The evaluation technique employed was the threshold contrast detail detectability (TCDD) technique, which enables image quality to be measured on devices operating in the clinical environment. This approach addresses image quality in the context of both the image acquisition and display processes, and uses human observers to measure performance. The Leeds test objects TO[10] and TO[10+] were used to obtain comparative measurements of performance on the FDXD and two digital spot fluorography (DSF) systems, one utilizing a Plumbicon camera and the other a state of the art CCD camera. Measurements were taken at a range of detector entrance exposure rates, namely 6, 12, 25 and 50 (mu) R/s. In order to facilitate comparisons between the systems, all fluoroscopic image processing such as noise reduction algorithms, were disabled during the experiments. At the highest dose rate FDXD significantly outperformed the DSF comparison systems in the TCDD comparisons. At 25 and 12 (mu) R/s all three-systems performed in an equivalent manner and at the lowest exposure rate FDXD was inferior to the two DSF systems. At standard fluoroscopic exposures, FDXD performed in an equivalent manner to the DSF systems for the TCDD comparisons. This would suggest that FDXD would therefore perform adequately in a clinical fluoroscopic environment and our initial clinical experiences support this. Noise reduction processing of the fluoroscopic data acquired on FDXD was also found to further improve TCDD performance for FDXD. FDXD therefore combines acceptable fluoroscopic performance with excellent radiographic (snap shot) imaging fidelity, allowing the possibility of a universal x-ray detector to be developed, based on FDXD's technology. It is also envisaged that fluoroscopic performance will be improved by the development of digital image enhancement techniques specifically tailored to the characteristics of the FDXD detector.

Proceedings Article | 24 July 1998 Paper

Technical and clinical results of an experimental flat dynamic (digital) x-ray image detector (FDXD) system with real-time corrections

Tom Bruijns, P. Alving, Edmund Baker, Robert Bury, Arnold Cowen, Norbert Jung, Hans Luijendijk, Henk Meulenbrugge, Hans Stouten

Proceedings Volume 3336, (1998) https://doi.org/10.1117/12.317038

KEYWORDS: Sensors, X-rays, Signal processing, X-ray detectors, X-ray imaging, Image processing, Image quality, Control systems, Digital imaging, Fluoroscopy

Read Abstract +

Proceedings Article | 25 April 1997 Paper

Digital high-resolution high-performance CCD camera with 2048x2048 pixels for dynamic applications

Harald Reiter, Tom Bruijns, Norbert Jung, A. Morgenstern, Gerhard Spekowius

Proceedings Volume 3019, (1997) https://doi.org/10.1117/12.275179

KEYWORDS: Cameras, Sensors, Imaging systems, Charge-coupled devices, CCD image sensors, X-rays, Clocks, Modulation transfer functions, CCD cameras, Image quality

Read Abstract +

Showing 5 of 9 publications

Conference Committee Involvement (2)

Physics of Medical Imaging

15 February 2004 | San Diego, California, United States

Physics of Medical Imaging

16 February 2003 | San Diego, California, United States

Keywords/Phrases

Search In:

Publication Years