Establishing Individual Dose System and Evaluating Image Quality for Oragn-Based Tube Current Modulation (OBTCM) CT

  • Tsai, Hui-Yu (PI)

Project: National Science and Technology CouncilNational Science and Technology Council Academic Grants

Project Details


The purpose of this two-year project is to estimate the image quality and to assess patient-specific doses and risks for organ-based tube current modulation (OBTCM). The patient-specific dose and image quality will be assessed according to clinical situations. The dose reduction methods for routine CT examinations will be implemented in this study. Conventional tube current modulation (TCM) is only to modulate the tube current according patient attenuation. However, the dose of radiosensitive organ within scan range remains not considered. Three methods for organ-based dose reduction methods are organ-based tube current modulation, in-plane shielding, and copper foil beam filtration. These three methods could reduce the radiation dose to superficial organs, such as eye lens and breasts when a patient undergoes a head or chest examination. According the standard procedure records during three kinds of CT patient examinations, specific patient models for organ-based tube current modulation, in-plane shielding, and copper foil beam filtration, will be implemented into Monte Carlo simulation system to calculate the organ doses, effective dose, and risks. The optimized standard procedure for organ-based dose reduction methods will be offered to clinic staffs. The preliminary results of this project were also included in this proposal. We found that OBTCM could reduce by 22% the dose to the eyes, and the image quality kept almost the same. In phantoms placed at off-centre positions, OBTCM increased by some 18% the dose to the eyes and doubled superficial dose to the breast in phantoms shifted downwards. The results have been published in SCI journals.

Project IDs

Project ID:PC10308-1027
External Project ID:MOST103-2314-B182-009-MY2
Effective start/end date01/08/1431/07/15


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