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[Absorbed dose during helical acquisition CT. Effect of acquisition parameters]
J Y Giraud1, J Sage, D Taisant
1Service de Cancérologie-Radiothérapie, CHU de Grenoble, BP 217, 38043 Grenoble Cedex. jean-yves.giraud@ujf-grenoble.fr
Journal De Radiologie
|February 27, 2001
Summary
This study quantifies radiation dose during spiral CT scans, analyzing factors like slice thickness and pitch. These findings aid in estimating patient radiation exposure for improved safety in radiological procedures.
Area of Science:
- Medical Physics
- Radiological Imaging
- Radiation Dosimetry
Context:
- European Directive 97/43 mandates patient dose estimation in radiological procedures.
- Spiral CT (Computed Tomography) is a widely used imaging modality requiring dose assessment.
- Accurate dose estimation is crucial for patient safety and regulatory compliance.
Purpose:
- To investigate and quantify the radiation dose delivered during spiral CT acquisition.
- To evaluate the impact of key acquisition parameters on patient dose.
- To prepare for the implementation of new European regulations on radiological dose estimation.
Summary:
- Investigated the influence of slice thickness, pitch, tube voltage/intensity, and acquisition length on radiation dose.
- Measured air kerma and absorbed dose in water using ionization chambers in a phantom.
- Evaluated dose distribution, including outside the primary acquisition volume and to distant organs.
Impact:
- Provides a foundation for systematic patient dose estimation in helical CT examinations.
- Measurements can be used to calculate doses for various acquisition protocols.
- Highlights the need for software development to integrate these findings into daily clinical practice for radiation safety.