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X-ray computer tomography photography system

A tomography and computer technology, applied in computerized tomography scanners, instruments for radiological diagnosis, diagnosis, etc., can solve the problem of inability to improve radiation dose efficiency, and achieve the effect of optimizing radiation dose efficiency

Active Publication Date: 2010-12-01
TOSHIBA MEDICAL SYST CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this point, state-of-the-art DEECs have not been able to improve radiation dose efficiency

Method used

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  • X-ray computer tomography photography system
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other Embodiment approach

[0088] Other embodiments utilize voltage modulation in low speed tube voltage switches. At this time, one of the low-energy scan and the high-energy scan is performed before the other of the low-energy scan and the high-energy scan, and X-rays of two types of spectra are generated. In each scan, the voltage of the X-ray tube 101 is independently modulated for the viewing angle in order to collect projection data with high radiation dose efficiency. If necessary, in each scan, the tube voltage and tube current of the X-ray tube 101 are independently modulated for each viewing angle in order to obtain the necessary image quality with less noise at the optimum radiation dose efficiency. In each viewing angle, the energy separation between low and high voltages must be sufficient to ensure stable decomposition.

[0089] In order to perform low-energy X-ray based data collection and high-energy X-ray based data collection in adjacent fields of view, high-speed switching of the tub...

other Embodiment approach

[0092] Other embodiments implement voltage modulation through two X-ray tubes (dual sources). 2 x-ray tubes generate 2 separate x-ray spectra. Projection data from 2 tubes are matched for each x-ray position for each viewing angle. According to this assumption, pre-reconstruction decomposition can be performed after a dual energy scan with one X-ray tube at low voltage and the other at high voltage. In order to obtain projection data with high radiation dose efficiency, the voltages of the 2 x-ray tubes are independently modulated for the viewing angle. If necessary, the voltages and currents of the two X-ray tubes are modulated separately for the viewing angle in order to obtain the necessary image quality with low noise and optimum radiation dose efficiency.

[0093] In the above-described embodiments, the voltage is selected such that the voltage modulation varies discretely or continuously as required. In discrete voltage modulation, a prescribed number of discrete volt...

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Abstract

The present invention provides an X-ray computer tomography photography system for improving safety of a patient by x-ray based overmuch irradiation without loss of picture quality. The computer tomography photography system is configured to modulate voltage for collecting at least two kinds of projection data corresponding to at least two energy action spectrums, and at least one of two tube voltages is modulated according to attenuation of x-ray in an object to be detected so as to optimize radiation dose efficiency.

Description

technical field [0001] Embodiments of the present invention relate to an X-ray computed tomography apparatus that modulates a tube voltage. Background technique [0002] In the conventional computed tomography system, the tube voltage and the tube current are fixed in principle during the data collection (scanning) period. Since attenuation largely depends on the angle of view, image quality becomes unstable. The physical size (X-ray transmission length) of the body part is greatly different due to the view angle (view angle) indicating the position of the X-ray tube rotating around the subject, and thus the X-rays are attenuated at different levels. That is, since the projection data set is collected by an X-ray beam of the same spectrum and flux regardless of the physical size of the body part, the image quality varies depending on the physical size and the like. When the tube voltage and tube current are increased to improve image quality, the radiation exposure increas...

Claims

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Application Information

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IPC IPC(8): A61B6/03
CPCA61B6/405A61B6/482
Inventor 邹宇
Owner TOSHIBA MEDICAL SYST CORP
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