RESUMO
Traditionally oral surgeons and dentists have evaluated the jaws using intraoral films and panoramic radiographs. The involvement of radiologists has been limited. In the past few years dedicated CT-software-programs developed to evaluate dental implant patients have provided a new look at the jaws. The complex anatomy is described and identified on human skulls and on axial, panoramic, and cross-sectional images. With this anatomic description Dental-CT-scans are used to demonstrate the anatomy of maxilla and the mandible. An overview of the technique of Dental-CT is provided, furthermore the radiation dose of different organs is explained. Suggestions to reduce these doses by simple modifications of the recommended protocols are given.
Assuntos
Doses de Radiação , Radiografia Dentária/métodos , Tomografia Computadorizada por Raios X , Humanos , Mandíbula/diagnóstico por imagem , Maxila/diagnóstico por imagem , Radiografia Dentária/instrumentaçãoRESUMO
The purpose of this study was to evaluate orthopantomography and a newly developed CT software package (Dental-CT) in the preoperative assessment of mandibular cysts. In this study 16 cysts in 13 patients were examined radiographically by orthopantomography and dental-CT to reformat the axial scans into truly cross-sectional views perpendicular to the anatomical axis of the jaw. The obtained images were compared for visualisation of the alveolar canal, the mandibular anatomy and the cortical involvement. Dental-CT proved superior for establishing a correct radiographic diagnosis and was rated significantly (p < 0.001) higher with regard to examined points. Dental-CT has to be considered the method of choice in the preoperative evaluation of mandibular cysts providing detailed anatomical information needed for the further management. Radiation exposure remains within an acceptable range.
Assuntos
Doenças Mandibulares/diagnóstico por imagem , Cistos Odontogênicos/diagnóstico por imagem , Tomografia Computadorizada por Raios X , Adolescente , Adulto , Diagnóstico Diferencial , Feminino , Humanos , Processamento de Imagem Assistida por Computador , Masculino , Pessoa de Meia-IdadeRESUMO
Life-threatening colonic hemorrhage is a very rare condition in Crohn's disease. Lower gastrointestinal hemorrhage in Crohn's disease occurs in 0.6-2.5% of cases. In a patient presenting with severe gastrointestinal bleeding after ileocolectomy, mesenteric angiography provided precise localisation of the bleeding site in the area of the splenic flexure.