Potentialités quantitatives et qualité d'image de la camera TEMP/TDM Siemens Symbia T6

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2011, May 07), 35

La vitamine D : effets « classiques », « non classiques » et évaluation du statut du patient

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2009), 33

Tomographie à émission de positons et lymphomes

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2008), 32

Amélioration de la visualisation des lésions parathyroïdiennes dans l’hyperparathyroïdie primaire par la tomographie pinhole au MIBI-Tc99m.

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2006), 30(09), 518

Etude comparative des performances en contraste sur vue planaire de 32 détecteurs de 20 caméras scintigraphiques.

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2005), 29(11), 711

La tomoscintigraphie avec γ-caméra commerciale munie d’un collimateur sténopé: aspects techniques et méthodes de reconstruction

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2004), 28(10), 493-506

This review paper describes the collimators, the acquisition parameters and the reconstruction methods used for tomoscintigraphy with a commercial gamma camera equipped with its standard pinhole ... [more ▼]

This review paper describes the collimators, the acquisition parameters and the reconstruction methods used for tomoscintigraphy with a commercial gamma camera equipped with its standard pinhole collimator. The pinhole collimator allows the tomoscintigraphy of small fields of view with a high spatial resolution. This property is exploited for the imaging of small animals and of small human organs. The tomographic acquisition can be achieved using a commercial γ-camera and a circular rotation of the detector over 360° or over a shorter angular range. The first part of the paper discusses the role of the aperture of the pinhole collimator, the type, material and dimension of which determine the compromise between resolution and sensitivity. The main formulae allowing to estimate the resolution and the sensitivity for a planar acquisition are presented. The second part of the paper is devoted to the reconstruction of tomographic pinhole data. The reconstruction requires a three-dimensional algorithm dedicated to the cone-beam geometry. Various analytic and algebraic algorithms have been developed and validated. Accurate reconstruction requires in particular correcting for the non-uniformity of the sensitivity in the field of view and for the center of rotation. These corrections can be applied to the projections prior to reconstruction, or they can be directly incorporated in the reconstruction algorithm. Correction for attenuation or diffusion can be performed with the help of pre- or post-correction methods or can be included in the transition matrix of the algebraic reconstructions. The paper concludes with an overview of the validation studies and of the performances obtained by various authors in function of the acquisition parameters and reconstruction algorithms. [less ▲]

Reproductibilité de la mesure de la fraction d'éjection ventriculaire gauche par ventriculographie isotopique lors d'un changement de caméra

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2003), 27(5), 251-256

The reproducibility of the left ventricular ejection fraction measure by equilibrium radionuclide angiocardiography has been evaluated when a large field of view camera is used instead of the small field ... [more ▼]

The reproducibility of the left ventricular ejection fraction measure by equilibrium radionuclide angiocardiography has been evaluated when a large field of view camera is used instead of the small field of view that has been used for 15 years in the service. The results have been analyzed using correlation curves, the Bland-Altman method and a paired t test. Linear regression between the left ejection fraction is FEVG(large field of view) = 0.961 FEVG(small field of view) + 5.0 (r = 0.935). Intra-operator reproducibility (mean difference = - 0.15 ± 2.02) and inter-operator reproducibility (absolute value of the mean difference smaller than 1.1 and standard deviation smaller that 2.5) have been measured for the 4 nurses that are entitled to practice this examination in the case of the large field of view camera. Finally, the reproducibility between two different acquisitions with the large field of view camera has been investigated and the following result has been obtained: FEVG(2) = 0.955 FEVG(1) + 3.178 (r = 0.948). Therefore, the reproducibility of the left ejection fraction measure was estimated to be within the expected limits and no correction for the camera change is applied to the long-term follow-up of the patients. [less ▲]

Influence de la taille de la matrice des projections sur la résolution et l’uniformité en tomoscintigraphie avec collimateur sténopé.

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2003), 27(9), 460

Reconstruction OSEM de tomoscintigraphies acquises avec un collimateur sténopé et une trajectoire non-circulaire.

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2003), 27

Attenuation et artefacts en TEMP osseuse du bassin et des hanches reconstruite par MLEM

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2001), 25(10), 602