Zobrazeno 1 - 10
of 38
pro vyhledávání: '"J. Brunol"'
Autor:
B. Zalc, Jacques Martinerie, Sylvain Baillet, Pierre Chavel, Catherine Tallon-Baudry, B. Renault, Didier Dormont, Philippe Lalanne, Olivier Colliot, M. Cuniot-Ponsard, J. Brunol
Publikováno v:
IRBM. 32:1-7
Abtract 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 alw
Publikováno v:
Optica Acta: International Journal of Optics. 28:313-324
Dans le domaine de l'imagerie a ouvertures microcodees appliquee au diagnostic des plasmas laser, on presente une analyse des codes particuliers qui privilegient une bande de frequences spatiales avec un rapport signal sur bruit eleve. Des progres im
Publikováno v:
Optics Communications. 45:155-159
When a circularly symmetric wavefront has to be encoded onto a computer generated hologram, it is highly desirable to preserve the symmetry. The coding scheme must therefore be circularly symmetric itself. This paper introduces a particular kind of c
Publikováno v:
Optics Communications. 31:129-134
We present 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
Autor:
J. Fonroget, J. Brunol
Publikováno v:
Optics Communications. 22:301-306
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 eit
Autor:
J. Fonroget, J. Brunol
Publikováno v:
Optics Communications. 25:35-39
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 γ ray motion tomography, yields recon
Publikováno v:
Optica Acta: International Journal of Optics. 25:113-124
Une methode de deconvolution analogique appliquee a l'imagerie par ouverture codee a ete developpee. Le bruit optique resultant de l'utilisation de l'eclairage coherent peut etre reduit par l'utilisation d'un correlateur incoherent a deux voies et d'
Publikováno v:
Optica Acta: International Journal of Optics. 28:1071-1085
Les examens de tomographie axiale transverse souffrent de limitations statistiques. A partir des processus de Poisson unidimensionnels que constituent les projections, nous analysons les elements de dependance du rapport signal sur bruit, aussi bien
Publikováno v:
Optics Communications. 25:163-168
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 inve
Publikováno v:
Optics Communications. 30:309-316
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