| Autor: |
Regis Vaillant, Kristina N. Watt, Lionel Desponds, Normand Robert, Sophie Rochette, John A. Rowlands |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Medical Physics. 42:521-530 |
| ISSN: |
0094-2405 |
| DOI: |
10.1118/1.4903898 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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