Absorption dose reduction by tube current modulation in CT system

Takayuki Nagaoka; Osamu Miyazaki

doi:10.1117/12.430943

28 June 2001 Absorption dose reduction by tube current modulation in CT system

Takayuki Nagaoka, Osamu Miyazaki

Proceedings Volume 4320, Medical Imaging 2001: Physics of Medical Imaging; (2001) https://doi.org/10.1117/12.430943
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

We developed the `Adaptive mA control system' that can modulate the tube current according to a patient's shape at the time of helical CT measurement. The purpose of our system is consistent with the improvement in image quality and the dose reduction. The patient shape is obtained by single direction scanogram before scanner rotation. And the controller of our system builds a 3D water equivalent model about patient's body. Therefore, our system can always control tube current during scans. The image artifact from high-density organ is reduced by the tube current control without rising mAs (milli-ampere second). From the results of the simulation with phantom's Voxel data, we have confirmed that our method reduces absorption dose about 12% (average) in lung area.

Citation Download Citation

Takayuki Nagaoka and Osamu Miyazaki "Absorption dose reduction by tube current modulation in CT system", Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); https://doi.org/10.1117/12.430943

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