Title:
【発明の名称】可変レントゲン線露光窓用単行程放射線散乱防止装置
Document Type and Number:
Japanese Patent JP2002539437
Kind Code:
A
Abstract:
A radiation anti-scatter device comprising a grid and a grid driver connected to the grid for unidirectionaly moving the grid with a variable grid velocity along a path between a starting and an end position, and a method of providing such grid motion. The variable grid velocity may have a velocity profile V1=k1t for a first period and then V2=k2t-m for a second period, where V1 and V2 are velocity, k1 and k2 are constants, t is time, and m is an exponent having a value greater than 0. The anti-scatter device may be a component of a direct radiographic diagnostic imaging system which includes an image-producing element having an array of radiation detectors aligned in rows, and where the anti-scatter device is a grid having vanes oriented at an angle to the detector rows. Radiation emission may be synchronized with the grid motion to optimize a radiograph for a particular grid, radiation source, or examination procedure. The apparatus implements a method for reducing Moiré patterns in radiographic detectors having an array of sensors by unidirectionaly moving the grid in a single stroke during the radiation exposure with an asymptotically decreasing speed profile such that grid motion is maintained for a plurality of different radiation exposure times.
Inventors:
Golden kelly pee.
Lee Denny El. Wai.
Lee Denny El. Wai.
Application Number:
JP2000604422A
Publication Date:
November 19, 2002
Filing Date:
March 03, 2000
Export Citation:
Assignee:
Direct Radiography Corporation
International Classes:
A61B6/06; G01T1/00; G01T7/00; G21K1/02; (IPC1-7): G01T7/00; A61B6/06; G01T1/00; G21K1/02
Attorney, Agent or Firm:
Ariga Gunichiro