Variation of hepatic artery by 3-D reconstruction MDCT scan of liver in Siriraj Hospital.

OBJECTIVE: To evaluate the prevalence of hepatic arterial variant in Siriraj Hospital. MATERIAL AND METHOD: A retrospective study that was approved by ethic committee of Siriraj Hospital. Between August and October 2006, 200 studies of abdominal MDCT were randomly sampled and multi-planar reformatted by using program Vitrea 2. Both axial, two- and three-dimensional images were evaluated for possible variants of hepatic vasculature. The results were classified by Michel classification and analyzed in percentage. Moreover, a small group (23 studies) that had digital subtraction angiography (DSA) was compared to know accuracy and Intercorelation between the two reviewers (Kappa value). RESULTS: Of 200 studies, 83.5% had type I, 1% type II, 6% type III, 0.5% type IV, 3.5% type V, 1% type VI, 0.5% type VIII, 1% type IX, 0.5% Type X, and 2.5% others type. Accuracy of MDCT for detection hepatic artery variation as compared with DSA was 78.3%. CONCLUSION: All variation is about 16%. Type III is most common variation of patients in Siriraj Hospital.

Aplicaçäo da radiaçäo síncrotron no estudo das artérias coronárias através do método dicromográfico / The application of syncrotron radiation to the study of the coronary arteries through the dichromographic method

A radiaçäo síncrotron proporciona uma nova fonte de raios X, altamente adequada para o estudo da circulaçäo coronariana, através da técnica da subtraçäo digital (digital subtraction angiography-DSA). A eliminaçäo das imagens contrastadas decorrentes da existência de estruturas näo-vasculares, a exposiçäo do paciente níveis de radiaçäo muito abaixo dos usualmente empregados em estudos angiográficos, a possibilidade de se obter imagens de alta resoluçäo e a eliminaçäo do uso do cateter intra-arterial nos permitem antecipar sua aplicaçäo, em futuro próximo, como recurso diagnóstico eficaz, seguro e de grande valor epidemiológico. O método apresenta excelente nível de sensibilidade ao iodo intra-arterial, o que possibilita a perspectiva de visualizar as artérias coronárias mediante a injeçäo periférica intravenosa do contraste iodado