Biomedical subjects

S Tavernier

Publications and source records attributed to S Tavernier.

3 recordsLinked to original sources

PubMed1992

A fully 3D small PET scanner.

A fully 3D small PET scanner based on a novel detection principle for gamma rays is described. It uses BaF2 scintillator and photosensitive wire chambers. Extensive tests with technical prototypes have shown that such a system will have a detection efficiency for gamma rays comparable with what can be obtained with the more traditional approach, and a spatial resolution determined by the size of the crystals. The expected performances of the scanner, based on our measurements and on simulations, are given.

Animals↗

PubMed1991

Progress in the development of a PET scanner based on BaF2 scintillator and photosensitive wire chambers.

The work presented is part of a design study for a Positron Emission Tomograph (PET) scanner based on the use of BaF2 scintillator and photosensitive wire chambers. The detection efficiency for gamma radiation of 511 keV is found close to 100% for a sufficiently large crystal. For a matrix of small and elongated crystals as one would use in a PET scanner (5 x 5 x 50 mm3) we obtained 6 photoelectrons per 511 keV deposited. The following variants and alternatives were also studied: operation of the wire chamber at atmospheric pressure; double readout where the crystals are read on one side with a photomultiplier to give time and energy resolution, and on the other side with a wire chamber to localise the event; and Csl photocathodes. Encouraging results have been obtained for each of these, but particularly the Csl photocathodes look very promising.

Animals↗

PubMedDate not supplied

[Gastric tumor in children. Apropos of 3 cases].

Gastric tumours are exceptional in children and are usually discovered due to digestive tract bleeding or after palpation of a mass in the abdomen. Appropriate exploratory techniques are need to correctly localize the lesions in the stomach. Nevertheless, the absence of any particular signs can mask the polymorphic nature of the lesions that can only be determined by pathologic examinations. The extent of the surgical exeresis and prognosis depend on the nature of the pathological process.

Adolescent↗