Use of active personal dosemeters in interventional radiology and cardiology: Tests in laboratory conditions and recommendations - ORAMED project

Active personal dosemeters (APD) have been found to be very efficient tools to reduce occupational doses in many applications of ionizing radiation. In order to be used in interventional radiology and cardiology (IR/IC), APDs should be able to measure low energy photons and pulsed radiation with relatively high instantaneous personal dose equivalent rates. A study concerning the optimization of the use of APDs in IR/IC was performed in the framework of the ORAMED project, a Collaborative Project (2008-2011) supported by the European Commission within its 7th Framework Program. In particular, eight commercial APDs were tested in continuous and pulsed X-ray fields delivered by calibration laboratories in order to evaluate their performances. Most of APDs provide a response in pulsed mode more or less affected by the personal dose equivalent rate, which means they could be used in routine monitoring provided that correction factors are introduced. These results emphasize the importance of adding tests in pulsed mode in type-test procedures for APDs. Some general recommendations are proposed in the end of this paper for the selection and use of APDs at IR/IC workplaces.

Jugement souverain, rendu en la Prevôté de l'Hôtel... qui condamne les nommés Pierre Force et Janvier, a être attachés au carcan... ayant écriteaux... portant ces mots : Fabricateurs de fausses cartes...

[Acte. 1755-01-13. Paris]

La légende du Juif errant, compositions et dessins de Gustave Doré... / préface et notice bibliographique de Paul Lacroix. Ballade [du Juif errant] / par Pierre-Jean de Béranger. Poème [du Juif errant] avec prologue et épilogue / par Pierre Dupont

Comprend : Ballade [du Juif errant] ; Poème [du Juif errant] avec prologue et épilogue

Défense de la Constitution civile du clergé, avec des réflexions sur l'excommunication dont nous sommes menacés ([Reprod.]) / par Pierre-Nicolas Tabourier,...

Collection : Les archives de la Révolution française ; 8.736

Active deformation fields: dense deformation field estimation for atlas-based segmentation using the active contour framework.

This paper presents a new and original variational framework for atlas-based segmentation. The proposed framework integrates both the active contour framework, and the dense deformation fields of optical flow framework. This framework is quite general and encompasses many of the state-of-the-art atlas-based segmentation methods. It also allows to perform the registration of atlas and target images based on only selected structures of interest. The versatility and potentiality of the proposed framework are demonstrated by presenting three diverse applications: In the first application, we show how the proposed framework can be used to simulate the growth of inconsistent structures like a tumor in an atlas. In the second application, we estimate the position of nonvisible brain structures based on the surrounding structures and validate the results by comparing with other methods. In the final application, we present the segmentation of lymph nodes in the Head and Neck CT images, and demonstrate how multiple registration forces can be used in this framework in an hierarchical manner.