X-ray CT apparatus and X-ray tube current determining method

Details X-ray CT apparatus and X-ray tube current determining method X-ray CT apparatus and X-ray tube current determining method

2008-12-23

2009-12-22

Thomas, Courtney (Department: 2882)

X-ray or gamma ray systems or devices

Electronic circuit

X-ray source power supply

C378S095000, C378S008000

Reexamination Certificate

active

07636422

ABSTRACT:
This invention is provided to determine a tube current at the imaging of the heart by an X-ray CT apparatus in such a manner that image noise becomes constant. Upon determining a tube current of an X-ray tube at the time that the heart is imaged by an X-ray CT apparatus, the tube current is determined based on an index related to image's noise and a BMI of a subject. The noise is at a central portion of an ascending main artery. Determining the tube current is conducted using a function with the BNI as a variable. The function is given in the form of a polynomial equation of the BMI. Each coefficient of the polynomial equation is a function of the index.

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