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Practical In situ Calibration for Dose-area Product Meter in Interventional Fluoroscopy: Beam-area Method
Fara Farisa Dhaifina1, Raushan Fikr Ilham Ibrahim1, Hanendya Disha Randy Raharja2
1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Kampus UI Depok, Depok, West Java, Indonesia.
Journal of Medical Physics
|April 21, 2025
Summary
Accurate calibration of dose-area product (DAP) meters is crucial for optimizing patient radiation dose in X-ray imaging. This study found that using ion chamber dosimeters with digital radiography field markers provides the most accurate DAP measurements during in situ calibration.
Area of Science:
- Medical Physics
- Radiological Sciences
- Radiation Dosimetry
Background:
- Dose-area product (DAP) is a key metric for ionizing radiation dose measurement in X-ray imaging, particularly fluoroscopy.
- Accurate calibration of DAP meters is essential for establishing and adhering to diagnostic reference levels, ensuring optimized patient radiation doses.
- In situ calibration methods for DAP meters require evaluation to ensure measurement accuracy.
Purpose of the Study:
- To evaluate the impact of different dosimeters and field markers on the accuracy of DAP measurements during in situ calibration.
- To identify the optimal combination of dosimeter types and field markers for the beam-area method of DAP meter calibration.
- To recommend a precise calibration method for confirming actual DAP values in planar radiography units.
Main Methods:
- Comparison of two in situ DAP meter calibration methods: the tandem method and the beam-area method.
- Utilized ion chamber dosimeters and solid-state dosimeters in conjunction with field markers from digital radiography (DR) and computed radiography (CR).
- Applied the beam-area method to a Philips Allura XPER FD 20 angiography unit, assessing accuracy via root mean square error.
Main Results:
- The combination of ion chamber dosimeters and DR field markers at a 55 cm distance yielded the most accurate DAP values.
- This specific combination demonstrated the lowest root mean square error (0.10), indicating high precision.
- The study identified specific dosimeter-field marker pairings that significantly influence DAP measurement accuracy.
Conclusions:
- The recommended calibration method, utilizing ion chamber dosimeters and DR field markers, ensures the highest accuracy for DAP measurements in planar radiography units.
- Accurate in situ calibration is vital for reliable diagnostic reference level monitoring and patient dose optimization.
- This research provides a practical guideline for improving the quality assurance of radiation dosimetry in X-ray imaging procedures.
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