RESUMO
A recently developed detection principle for gamma rays offers the prospect of improving the performance of positron emission tomographic scanners. This detection principle is based on the use of BaF2 scintillator and photosensitive wire chambers. We present technical results obtained with a prototype detector. It is shown that the impact point of the gamma ray can be determined with a precision of a few mm and that the detection efficiency is 60% with a time resolution of 10 ns (FWHM). A scanner based on the new principle is described and its anticipated performance discussed.
Assuntos
Tomografia Computadorizada de Emissão/métodos , Tomografia Computadorizada de Emissão/instrumentaçãoRESUMO
A gamma-camera on-line distortion corrector, based on a fast microprocessor, has been tested on two cameras. The original electronic design and the software algorithm are described. Performance measurements on phantoms and clinical results show an improvement of the pictures.
Assuntos
Computadores , Processamento de Imagem Assistida por Computador , Microcomputadores , Sistemas On-Line/instrumentação , Cintilografia/instrumentação , Humanos , Pertecnetato Tc 99m de Sódio , Doenças da Glândula Tireoide/diagnóstico por imagemRESUMO
The authors describe 3 cases of apophyseal detachment of the anterior iliac spines. This traumatic affection occurs mainly in adolescents during sporting activities, and is a rare disorder. It has to be borne in mind when a more or less typical clinical picture is present, and the diagnosis can be made by radiological examination.
