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Proceedings Paper

Absorption dose reduction by tube current modulation in CT system
Author(s): Takayuki Nagaoka; Osamu Miyazaki
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Paper 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.

Paper Details

Date Published: 28 June 2001
PDF: 13 pages
Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); doi: 10.1117/12.430943
Show Author Affiliations
Takayuki Nagaoka, Hitachi Medical Corp. (Japan)
Osamu Miyazaki, Hitachi Medical Corp. (Japan)

Published in SPIE Proceedings Vol. 4320:
Medical Imaging 2001: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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