Ms. Eloïse C. Denis Profile

Eloïse C. Denis

at QualiformeD SARL

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Publications (6)

Proceedings Article | 3 April 2008 Paper

New automatic quality control methods for geometrical treatment planning system tools in external conformal radiotherapy

Eloïse Denis, Stéphane Beaumont, JeanPierre Guédon, Tarraf Torfeh, Nicolas Normand, Norbert Ailleres

Proceedings Volume 6913, 69133E (2008) https://doi.org/10.1117/12.768670

KEYWORDS: Collimators, Control systems, Radiotherapy, Optical spheres, Virtual reality, Algorithm development, Process control, Automatic control, Standards development, Tumors

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Proceedings Article | 18 March 2008 Paper

Digital phantoms for the evaluation of a software used for an automatic analysis of the Winston-Lutz test in image guided radiation therapy

Tarraf Torfeh, Stéphane Beaumont, David Bonnet, Yves Barbotteau, Jean-Pierre Guédon, Nicolas Normand, Eloïse Denis, Pascal Fenoglietto, Norbert Ailleres

Proceedings Volume 6913, 69133F (2008) https://doi.org/10.1117/12.768668

KEYWORDS: Collimators, Sensors, Tungsten, 3D image processing, Image segmentation, Image processing, Image sensors, Image guided radiation therapy, Medical imaging, Radiotherapy

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Proceedings Article | 28 March 2007 Paper

Automatic quality control of digitally reconstructed radiograph computation and comparison with standard methods

Eloïse Denis, Stéphane Beaumont, JeanPierre Guédon, Nicolas Normand, Tarraf Torfeh

Proceedings Volume 6510, 65104J (2007) https://doi.org/10.1117/12.708193

KEYWORDS: Modulation transfer functions, Scanners, Spatial resolution, Point spread functions, Beam controllers, Skin, Image quality, Radiography, Signal to noise ratio, Computed tomography

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Proceedings Article | 28 March 2007 Paper

Software tools dedicated for an automatic analysis of the CT scanner quality control images

Tarraf Torfeh, Stéphane Beaumont, JeanPierre Guédon, Nicolas Normand, Eloïse Denis

Proceedings Volume 6510, 65104G (2007) https://doi.org/10.1117/12.707343

KEYWORDS: Computed tomography, Process control, Image quality, Scanners, Image processing, Software development, Point spread functions, Spatial resolution, Modulation transfer functions, Optical spheres

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Proceedings Article | 2 March 2006 Paper

Discrete and continuous description of a three-dimensional scene for quality control of radiotherapy treatment planning systems

Eloise Denis, JeanPierre Guédon, Stéphane Beaumont, Nicolas Normand

Proceedings Volume 6142, 614255 (2006) https://doi.org/10.1117/12.650571

KEYWORDS: Control systems, Radiotherapy, 3D modeling, Computed tomography, Scanners, Image quality, X-ray computed tomography, Tumors, Radiography, 3D acquisition

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Proceedings Article | 20 April 2005 Paper

Digital reconstructed radiography quality control with software methods

Eloise Denis, Stephane Beaumont, JeanPierre Guedon

Proceedings Volume 5745, (2005) https://doi.org/10.1117/12.593415

KEYWORDS: Radiography, Medical imaging, X-ray computed tomography, Physics, Radiotherapy, Scanners, Virtual reality, Tissues, Visualization, Skin

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Nowadays, most of treatments for external radiotherapy are prepared with Treatment Planning Systems (TPS) which uses a virtual patient generated by a set of transverse slices acquired with a CT scanner of the patient in treatment position ^{1 2 3}. In the first step of virtual simulation, the TPS is used to define a ballistic allowing a good target covering and the lowest irradiation for normal tissues. This parameters optimisation of the treatment with the TPS is realised with particular graphic tools allowing to: •Contour the target, •Expand the limit of the target in order to take into account contouring uncertainties, patient set up errors, movements of the target during the treatment (internal movement of the target and external movement of the patient), and beam's penumbra, •Determine beams orientation and define dimensions and forms of the beams, •Visualize beams on the patient's skin and calculate some characteristic points which will be tattooed on the patient to assist the patient set up before treating, •Calculate for each beam a Digital Reconstructed Radiography (DRR) consisting in projecting the 3D CT virtual patient and beam limits with a cone beam geometry onto a plane. These DRR allow one for insuring the patient positioning during the treatment, essentially bone structures alignment by comparison with real radiography realized with the treatment X-ray source in the same geometric conditions (portal imaging). Then DRR are preponderant to insure the geometric accuracy of the treatment. For this reason quality control of its computation is mandatory⁴ . Until now, this control is realised with real test objects including some special inclusions^{4 5} . This paper proposes to use some numerical test objects to control the quality DRR calculation in terms of computation time, beam angle, divergence and magnification precision, spatial and contrast resolutions. The main advantage of this proposed method is to avoid a real test object CT acquisition allowing for a drastic time reduction of the control as well as its automatic control. This method has been used to test a new method to compute DRR⁶ and is here presented to control a standard DRR calculation algorithm⁷ .

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