Shimadzu Corporation

Naoki Hasegawa

Keiichi Tanno

Kazuhiro Mori

Shingo Baba

David Thibault Pelletier

Takaya Yamamoto

In this radiation fluoroscopic imaging apparatus, an image processing unit is configured to generate a first image by performing first image processing that clarifies a blood vessel as an imaging target when capturing a plurality of contrast agent images and generate a plurality of second images used to generate a differential long image by performing second image processing.

Radiation fluoroscopic imaging apparatus

An X-ray diagnostic apparatus includes a peak frequency detector detecting a peak frequency of a first harmonic in a moir&#xe9; pattern of a grid in an image; a harmonic remover removing the first harmonic and a second harmonic in the moir&#xe9; pattern from the image in accordance with the peak frequency of the first harmonic to obtain a first and second harmonic removed image; a harmonic extracting-filter generating unit calculating a peak frequency of a third harmonic in the moir&#xe9; pattern in accordance with the peak frequency of the first harmonic to generate a harmonic extracting filter to extract the third harmonic; a harmonic extracting unit extracting the third harmonic from the first and second harmonic removed image based on the harmonic extracting filter; and a harmonic subtracting unit subtracting the extracted third harmonic from the first and second harmonic removed image to obtain a third harmonic removed image.

X-ray diagnostic apparatus and storage medium storing X-ray diagnostic program

An apparatus, system, and method corrects line deficiency in radiographic systems. A Fourier transform element provides a one-dimensional Fourier transform on a line orthogonal to a line of a moire patterns appearing in an X-ray image during a use. A peak frequency detection element detects the peak frequency indicating the spatial frequency of the moire pattern on the basis of the results of one-dimensional Fourier transform. The detected peak frequency is transformed to a number of pixels in 1 cycle of the moire pattern by a pixel cycle conversion element. The line deficiency correction element obtains pixels of the same phase as the line deficiency pixel in the moire pattern from the number of pixels, and then corrects the line deficiency pixel by using the pixel value thereof. Since the number of pixels in 1-cycle is acquired from the moire pattern in the X-ray image, the line deficiency can be corrected.

Radiographic apparatus and method for the same

An X-ray apparatus includes a pixel-extracting section for extracting pixels determined in advance in each line of an image containing a grid moir&#xe9; pattern, a FFT processing section for performing one-dimensional FFT to the extracted pixels, a peak-frequency detecting section for detecting a peak frequency from a frequency characteristic for each line having undergone FTT, a frequency-characteristic preparing section for preparing a frequency characteristic for extracting the grid moir&#xe9; pattern in accordance with the detected peak-frequency, an inverse FFT processing section for performing inverse FFT to the frequency characteristic prepared by the frequency-characteristic preparing section, and an FIR filtering section for performing FIR filtering on the image with use of a value calculated by the inverse FFT processing section as an FIR filter coefficient.

X-ray apparatus

A radiographic device includes grid frequency component eliminating processing means for eliminating a grid frequency component from an original image detected by a radiation detecting device; wherein said means includes a BPF and an HPF for producing a band-pass grid image and a high-pass grid image from an original image through band-pass and high-pass extraction; a subtracting device for taking the difference between these two grid images; an LPF for producing a difference grid image comprising the grid frequency components not completely extracted by the band-pass, through performing a low-pass processed on the difference image in a direction that is parallel to the grid pattern; an adding device for producing a band-pass+difference grid image by adding the difference grid image to the band-pass grid image; and a subtracting device for subtracting the band-pass+difference grid image from the original image.

Growing community of inventors

Kyoto, Japan

Naoki Hasegawa