| Autor: |
Robert, Normand, Watt, Kristina N., Rochette, Sophie, Desponds, Lionel, Vaillant, Régis, Rowlands, John A. |
| Předmět: |
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| Zdroj: |
Medical Physics; Jan2015, Vol. 42 Issue 1, p521-530, 10p |
| Abstrakt: |
Purpose: The authors describe a design for prepatient region of interest attenuators (ROIAs) to reduce dose area product (DAP) for clinical use. The authors describe a model to predict DAP values from x-ray technique parameters recorded during a clinical procedure for image sequences obtained in the presence or absence of ROIAs. The model was developed primarily to determine what the DAP to a patient undergoing cardiac catheterization with a ROIA would have been if no ROIA had been used allowing a determination of DAP reduction. Methods: Copper ROIAs with thicknesses that vary gradually so as not to cause significant image artifacts were constructed. X-ray image sequences were acquired on a clinical catheterization system with and without ROIAs with varying x-ray technique parameters. DAP values were measured for all said exposures using an ionization chamber and compared to a model the authors developed. Results: The model can predict DAP values within 3.5% on average with or without ROIAs when compared to ionization chamber measurements. Conclusions: The proposed experimental design is adequate for measuring DAP reductions on the order of 1.5-3.5 that are expected when introducing a ROIA during patient catheterization imaging. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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