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A novel method for CT dosimetry with a suspended phantom setup.

Mariaconcetta Longo¹, Elisabetta Genovese¹, Chiara Orlandi²

¹Medical Physics Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)

|July 19, 2017

Summary

A new suspended phantom setup allows for accurate CT dosimetry in stationary positions. This method validates CT dose assessment for helical scans, showing good agreement with standard procedures and console values.

Keywords:

CT dose phantoms Computed Tomography Dose Length Product Dosimetric indices

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Area of Science:

Medical Physics
Radiological Imaging

Background:

Accurate CT dosimetry is crucial for patient safety.
Current methods for helical CT scans can be complex and may not fully capture dose distribution.

Purpose of the Study:

To present and validate a novel method for estimating CT dosimetric indices using a suspended phantom system.
To enable direct assessment of dosimetric indices in helical CT scans.

Main Methods:

A prototype suspended phantom/ion chamber system was developed for stationary positioning at the CT isocenter.
The method utilizes a stationary reference setup and mathematical formalism.
Experimental measurements compared the new method with standard CT dosimetry procedures and CT console values.

Main Results:

Good agreement was observed between dosimetric indices from the suspended phantom setup and the standard setup.
The proposed method showed differences below 2% compared to CT console displayed values.

Conclusions:

The suspended phantom setup facilitates CT dosimetry with a stationary dose detector.
This approach allows for accurate CT dose assessment in high pitch helical scans, partial rotations, and dynamic collimation scenarios.