Fujitsu Corporation

Kenji Ishiwata

Fumihiro Namiki

Hideyuki Hirano

Takahiro Haraki

Siro Takeda

Shiro Takeda

Shin-ichi Amemiya

Shigehiko Katsuragawa

Katsumi Abe

A method for processing a radiographic image, containing: a step for calculating an average S.sub.m of original image data of an averaging area around each pixel of the radiographic image; and a step for transforming the original image data S of each pixel of the radiographic image to obtain a processed image data Q of each pixel in accordance with an equation, Q=S+.function.(S-S.sub.m), where .function.(S-S.sub.m) has a characteristic in at least one of first and second ranges of the difference S-S.sub.m, the difference S-S.sub.m is positive in the first range and negative in the second range, and according to the above characteristic, the absolute value .vertline.Q-S.vertline. varies in accordance with an increasing monotonic function of the absolute value .vertline.S-S.sub.m .vertline. when the absolute value .vertline.S-S.sub.m .vertline. is less than a predetermined value, and the absolute value .vertline.Q-S.vertline. varies in accordance with a decreasing monotonic function of the absolute value .vertline.S-S.sub.m .vertline. when the absolute value .vertline.S-S.sub.m .vertline. of the difference S-S.sub.m is more than the predetermined value. The above function .function.(S-S.sub.m) may be a non-odd function of the difference S-S.sub.m.

Radiographic image processing method wherein small variation of density

The present invention relates to a method for processing an image corresponding to a radiographic pattern, the image being formed of a plurality of pixels each having a value corresponding to density. The method includes the steps of obtaining an image corresponding to a radiographic pattern so that values of pixels forming the image are stored in a memory; dividing the image into a plurality of image regions based on the values of the pixels forming the image, each image region including pixels each of which has a value falling within a predetermined range; and applying an image processing to the plurality of image regions of the image, processing conditions used for the plurality of image regions in the image processing differing from each other.

Method and apparatus for processing image corresponding to radiographic

The invention relates to a radiation image converting apparatus which employs an accelerated phosphorescence fluorescent plate which is rigid or low in flexibility, and it is an object of the invention to provide a radiation image converting apparatus which prevents radiations having passed through an accelerated phosphorescence fluorescent plate from being scattered and irradiated upon the accelerated phosphorescence fluorescent plate again and achieves miniaturization of the equipment and simplification in structure. The radiation image converting apparatus of the present invention is comprises a lead containing sheet or a radiation absorbing plate which is composed of a plurality of rigid lead containing plates combined with each other, and a moving mechanism for moving the lead containing sheet or the radiation absorbing plate such that the lead containing sheet or the radiation absorbing plate is moved to a position behind the accelerated phosphorescence fluorescent plate prior to photographing but is retracted from the position behind the accelerated phosphorescence fluorescent plate prior to reading.

Radiation image converting apparatus

An ultrasonic continuous wave blood flowmeter using Doppler effect analysis includes a filter having a cut-off frequency determined in part by a manually selected zero shift value. A tranducing device, in the flowmeter includes a transmission element and a reception element, the transmission element transducing an electric transmission signal into an ultrasonic signal to irradiate a living body and the reception element transducing a reflected ultrasonic signal into an electric reception signal. A detecting circuit is operatively connected to the transducing device for orthogonally detecting the electric reception signal and outputting a Doppler detection signal. A filter circuit is operatively connected to the detecting circuit for cutting high frequency components of the Doppler detection signal based on the cut-off frequency and outputting an analog signal. A converting circuit is operatively connected to the filter circuit for converting the analog signal of the filter circuit to a digital signal based on a Doppler sampling frequency having a continuous wave. A transforming circuit is operatively connected to the converting circuit for analyzing the digital signal and obtaining a Doppler frequency spectrum based on a Fourier transform method. A control circuit is operatively connected to the filter circuit for controlling the cut-off frequency based on the Doppler sampling frequency and the zero shift value.

Growing community of inventors

Kawasaki, Japan

Kenji Ishiwata