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[Patient dose simulation in X-ray CT using a radiation treatment-planning system]
Yasuo Nakae1, Masahiko Oda, Takahiro Minamoto
1Department of Clinical Radiology, The Hospital of Hyogo College of Medicine.
Nihon Hoshasen Gijutsu Gakkai Zasshi
|September 10, 2003
Summary
Patient dose in CT scans increases with advanced technology. This study simulated patient dose distribution using a treatment-planning computer, analyzing thorax imaging for accurate dose evaluation.
Area of Science:
- Radiological Physics
- Medical Imaging
- Radiation Oncology
Context:
- Increasing medical irradiation dosage due to advanced radiological equipment and interventional techniques.
- Rising patient radiation dose associated with multi-slice computed tomography (CT).
- Computed Tomography Dose Index (CTDI) as a standard for CT dose measurement, though patient dose distribution varies.
Purpose:
- To analyze patient dose distribution in CT examinations.
- To utilize a radiation treatment-planning computer for simulating CT dose distribution.
- To evaluate patient dose by simulating dose distribution in the thorax using CT images.
Summary:
- Patient dose was analyzed using a radiation treatment-planning computer, incorporating Percent Depth Dose (PDD) and Off-Center Ratio (OCR) data.
- CT X-ray data were measured and sent to the planning computer for dose simulation.
- Elliptical phantom measurements and simulations were collated to determine CT irradiation dose for patient dose simulation.
- A rotational radiation treatment technique was employed to obtain CT patient dose distribution, with thorax CT images used for simulation.
Impact:
- Provides a method for simulating and evaluating patient dose distribution in CT examinations.
- Enhances understanding of radiation dose variations based on patient-specific factors and exposure conditions.
- Contributes to more accurate patient dose assessment in radiological procedures, particularly in thorax imaging.