Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-09-05
1986-12-30
Church, Craig E.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
378 99, H05G 164, H04N 532
Patent
active
046333070
ABSTRACT:
In a digital intravenous subtraction fluorographic system, X-ray subtraction images obtained by performing a subtraction between the precontrast images and the post-contrast images are processed by comparing, for each pixel, the value of the pixel image data in the difference image with a predetermined threshold intensity value, and recognizing the time until the value of the pixel image data reaches the threshold intensity value. The resulting time data so determined in the processor is used for displaying the distribution of contrast medium in the vessel in relation to the time periods it takes for each pixel to attain the predetermined threshold intensity. In effect, the time data for each pixel is itself converted to an intensity signal dependent on the amount of time it takes for each pixel to cross the predetermined threshold intensity, and it is the time period derived intensity signal which is displayed.
REFERENCES:
patent: 4204225 (1980-05-01), Mistretta
patent: 4204226 (1980-05-01), Mistretta et al.
patent: 4436095 (1984-03-01), Kruger
patent: 4504908 (1985-03-01), Riederer et al.
patent: 4542459 (1985-09-01), Riederer
Church Craig E.
Kabushiki Kaisha Toshiba
Wieland Charles
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