Some content of this application is unavailable at the moment.
If this situation persist, please contact us atFeedback&Contact
1. (US20060018430) Active dose reduction device and method

Office : United States of America
Application Number: 10894427 Application Date: 20.07.2004
Publication Number: 20060018430 Publication Date: 26.01.2006
Grant Number: 7215739 Grant Date: 08.05.2007
Publication Kind : B2
IPC:
H05G 1/00
H05G 1/54
H ELECTRICITY
05
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
G
X-RAY TECHNIQUE
1
X-ray apparatus involving X-ray tubes; Circuits therefor
H ELECTRICITY
05
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
G
X-RAY TECHNIQUE
1
X-ray apparatus involving X-ray tubes; Circuits therefor
08
Electrical details
26
Measuring, controlling, protecting
54
Protecting
Applicants: Communications & Power Industries Canada Inc.
Inventors: Cunningham James Allan
Neysmith Peter Francis
Priority Data: 10894427 20.07.2004 US
Title: (EN) Active dose reduction device and method
Abstract: front page image
(EN)

An active dose radiation device and method decreases the amount of x-rays which may be generated by an x-ray tube following termination of the x-ray exposure. One component of the x-ray system is connected to the device which has a plurality of electronic cells that can be overvoltaged from a first state, where they are less conductive, to a second state, where they are highly conductive. A voltage pulse generator overvoltages a first cell in the plurality of cells at termination of an x-ray exposure. Overvoltaging the first cell causes a cascading effect which eventually overvoltages all of the cells and changes the state of the cells from the first less conductive state to the second highly conductive state. In the second highly conductive state, the cells can conduct current from at least one component of the x-ray system to ground thereby reducing x-rays generated by the x-ray tube and reducing the x-ray dosage from the imaging system after the x-ray exposure has been completed. The plurality of cells automatically reverts to the first state once current passing through the cells decreases below a threshold current level. The plurality of cells are connected to only the anode side 26 or the cathode side 38 of the x-ray imaging device in order to discharge energy from only one side to ground which results in a sufficient decrease in the voltage across the x-ray tube to prevent generation of active dosage of x-rays which may penetrate the patient.


Also published as:
CN101019471