SciELO - Scientific Electronic Library Online

 
vol.39 número5Systematization of vestibular aqueduct anatomical study by high-resolution computed tomography in patients with unilateral Ménière's diseaseIndependent dose calculation for dynamic arc treatments delivered with micromultileaf collimator índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Radiologia Brasileira

versión impresa ISSN 0100-3984

Resumen

PINA, Diana Rodrigues de; MORCELI, José; DUARTE, Sérgio Barbosa  y  GHILARDI NETTO, Thomaz. Optimization of mammographic images. Radiol Bras [online]. 2006, vol.39, n.5, pp. 351-354. ISSN 0100-3984.  http://dx.doi.org/10.1590/S0100-39842006000500010.

OBJECTIVE: The aim of this study is the optimization of mammographic images with a considerable radiation dose reduction. MATERIALS AND METHODS: In the present study the X-ray beam was calibrated for each tension (kVp), aiming at determining the best combination between kVp and mAs, resulting in optical densities of about 1.0 above the base-plus-fog density. RESULTS: This study will bring into question the methods for X-ray beam calibration, the choice of the best image by means of visual grading analysis, comparisons between doses and tube load (kVp × mAs) delivered by the techniques described in this study and by those adopted in the clinical routine at Service of Diagnostic Imaging of Faculdade de Medicina de Botucatu Clinics Hospital, Botucatu, SP, Brazil. Excellent breast radiographic images have been obtained with doses and tube loads reduction of respectively 36.8% and 46.2% in comparison to those employed in our institutions' clinical routine. CONCLUSION: This study is a contribution to the optimization of the risk-benefit ratio for patients and cost-benefit ratio for the institution.

Palabras llave : Mammography; Homogeneous phantom; Quality control; Dose reduction.

        · resumen en Portugués     · texto en Portugués | Inglés     · pdf en Inglés | Portugués