Jean Brunol

Jean Brunol
edje innovation · physics

About

23
Publications
511
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95
Citations
Citations since 2016
0 Research Items
3 Citations
20162017201820192020202120220.00.20.40.60.81.0
20162017201820192020202120220.00.20.40.60.81.0
20162017201820192020202120220.00.20.40.60.81.0
20162017201820192020202120220.00.20.40.60.81.0

Publications

Publications (23)
Article
Full-text available
Line Garnero passed away in the night between July 12 and 13, 2009 after an intense but too short a battle against cancer. Line was one of the most active scientific figures of the medical imaging community. A major motivation to Line has always been to facilitate communication and mutual understanding amongst her collaborators, to help them build...
Article
Full-text available
Line Garnero passed away in the night between July 12 and 13, 2009 after an intense but too short a battle against cancer. Line was one of themost active scientific figures of the medical imaging community. A major motivation to Line has always been to facilitate communication andmutual understanding amongst her collaborators, to help them build st...
Article
Une méthode de déconvolution analogique appliquée à l'imagerie par ouverture codée a été développée. Le bruit optique résultant de l'utilisation de l'éclairage cohérent peut être réduit par l'utilisation d'un corrélateur incohérent à deux voies et d'hologrammes calculés par ordinateur. Nous présentons des résultats expérimentaux prouvant l'efficaci...
Article
Dans le domaine de l'imagerie à ouvertures microcodées appliquée au diagnostic des plasmas laser, on présente une analyse des codes particuliers qui privilégient une bande de fréquences spatiales avec un rapport signal sur bruit élevé. Des progrès importants peuvent ainsi être obtenus par rapport à l'imagerie conventionnelle, permettant par exemple...
Chapter
As we say at the begining, coded aperture imaging is a general method not limited to nuclear medicine. It can be used in several domains such as neutrons, a particles imaging. We begin to develop it in microimaging for laser induced plasmas diagnosis. The first results that we obtained in this field show a resolution of 10 m and we hope rapidly a g...
Article
The different problems of positional inaccuracy of the recording system in emission computed axial tomography are studied. Mathematical analysis and experimental results show the artefacts due to these misadjustments, which appear in the reconstructed images. Some threshold tolerable values for these adjustments are given.
Article
A system for reproducing circular symmetry in computer-generated holograms (CGH) through the use of Fresnel diffraction in a detour-phase technique is presented. The detour-phase technique of Lohmann (1976) is generalized to apply to Fresnel diffraction, and the 2-D Fourier transform of a circular sampling theorem is applied to the solution of the...
Chapter
The development of tomographic methods has led to considerable progress in medical diagnosis based on external exploration. Among these examinations, nuclear medicine has a fundamentally functional vocation as opposed to the morphological exploration methods (X-rays, echography). The result is a high diversity in the nature itself of the study (sci...
Chapter
Classical or static transaxial tomography has now become a powerful tool in nuclear medicine [1–3]. However, the necessary limitation in the radioactive dose the patient is exposed to, leads to low statistical quality of the reconstructed slices. Thus, dynamic imaging appears to be very difficult due to the reduction of activity in each individual...
Article
Les examens de tomographie axiale transverse souffrent de limitations statistiques. A partir des processus de Poisson unidimensionnels que constituent les projections, nous analysons les éléments de dépendance du rapport signal sur bruit, aussi bien en tomographie d'émission qu'en tomographie d'absorption. Ensuite, dans le cadre de la tomographie d...
Article
Using a 3-D Fourier analysis, we investigate the nature of the informations contained in the high resolution motion pinhole recordings. We show that these images can be interpreted as parallel projections of a distorted 3-D emitting object. Thus, the use of the 3-D central slice theorem and the circular motion of the pinhole show that a 3-D Fourier...
Article
The paper presents a coded aperture imaging method which could be applied to the study of microplasmas obtained by laser. Based on the use of an annular aperture associated with a deconvolution processing, this method gives sections of the X-ray and emitted particle tridimensional distribution. The first experimental result shows the range of possi...
Article
A 3-D reconstruction method from parallel projections developed in nuclear medicine imaging is presented. The two specific problems arising are the absorption of gamma rays by the tissues and low count rate. The first problem is solved by approached means and the noise is reduced by pseudo-Wiener filtering techniques. "In vivo" results that show th...
Article
Improvement of signal to noise ratio and image quality with multiplicative or additive fluctuations are well-known problems. We analyse here these two aspects of the restoration of an image in the domain of photon noise. The main developments of this analysis are made with coded poisson process, for the application in gammagraphy. The influence of...
Article
We present here a 3-D image processing applied to coded aperture imaging. As a code we use a ring, and decoding is performed by deconvolution. Depth and lateral resolution are examined by Fourier and object space analyses. In particular contrast inversions are put in evidence and their influence in nuclear medicine is discussed. The theory is confi...
Article
A sequential method is developed to obtain a high resolution 3-D image distribution of the activity of a radioactive tracer. Two different types of reconstruction are presented. The first method, related to X or gamma ray motion tomography, yields reconstructed objects slices (tomograms) containing superimposed out-of-focus blurred planes. The seco...
Article
In coded aperture imaging applied to nuclear medicine, the ultimate limit is the Poisson noise of the gamma ray source. We show that the noise depends on the type of code. In particular we compare the signal to noise ratio between images obtained either by a Fresnel zone or by an annulus at equal resolution. This comparative study allows to choose...
Article
Computing the Fourier transform of a circularly symmetric function is often necessarry in optics. The use of the 2-D Fast Fourier Transform (FFT) algorithm leads to loss of the circular symmetry through square sampling and excessive use of computer memory because the 2-D sampling does not take into account the a priori knowledge of the symmetry of...
Article
Différents aspects de l'application de la tomographie axiale transverse dans les Contrôles Non Destructifs industriels par rayons X et rayons gamma sont présentés. Nous montrons en particulier qu'un optimum de l'énergie du rayonnement à utiliser peut être trouvé. Cet optimum, qui dépend de l'objet lui-même, correspond à des processus d'interaction...

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