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SU-D-217BCD-02: Online Angular Tube Current Modulation in X-Ray Computed Tomography: Can Tube Current Be Modulated

K Matsubara^1,2, H Koshida^1,2, T Takata^1,2

¹Kanazawa University, Kanazawa.

Medical Physics

|May 19, 2017

Summary

This summary is machine-generated.

Online angular tube current modulation (TCM) in X-ray CT effectively reduces radiation dose by real-time adjustments. This method ensures lower and more stable absorbed doses during scans.

Keywords:

Computed tomography Computer software Electric measurements

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Area of Science:

Medical Imaging
Radiological Physics

Background:

X-ray computed tomography (CT) exhibits directional differences in X-ray attenuation.
Adjusting tube current within a gantry rotation, known as angular tube current modulation (TCM), is necessary to optimize radiation exposure.

Purpose of the Study:

To evaluate the effectiveness of online angular TCM in reducing radiation dose during X-ray CT scans.
To determine if real-time adjustments of tube current can appropriately manage radiation exposure.

Main Methods:

Utilized a 128-detector dual-source CT scanner with an integrated online TCM system.
Acquired dose profiles and absorbed dose distributions using specialized phantoms and dosimeters (CT Dose Profiler, elliptical cylindrical phantom, anthropomorphic phantom, radiophotoluminescent glass dosimeters).
Compared helical CT scans performed with and without online angular TCM.

Main Results:

Online angular TCM successfully adjusted tube current in near-real time based on previous projection data.
Dose profiles demonstrated gradual stabilization with TCM, indicating proper tube current adjustments.
Scans with TCM showed lower and more stable absorbed dose distributions compared to scans without TCM.

Conclusions:

Online angular TCM is an effective method for reducing radiation dose in X-ray CT.
Real-time adjustment of tube current within a single gantry rotation significantly improves dose management.