Title:
DIGITAL X-RAY IMAGE PROCESSOR
Document Type and Number:
Japanese Patent JP3024568
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To suppress the halation by using the gradation conversion means having different linear conversion characteristics at each stage of input data, detecting the luminance in a region of interest out of the data received from an A/D conversion means, and setting the linear conversion characteristic of each stage according to the detected luminance.
SOLUTION: For instance, the X-ray video signals sent from a camera of a medical X-ray TV system are inputted to an A/D converter 11. The converter 11 has 12 output bits and also has the density resolution higher than a clinically useful gradation range by several times. Thus no halation is caused by the converter 11. In other words, 9 bits of gradation are usually required for the fluoroscopic images and the digital radiography and accordingly the conversion 11 has the reproducibility up to the signal intensity of 8 times as much as the normal intensity with no halation. Furthermore, the halation is suppressed down to the signal intensity of 4 times for a digital subtraction image that requires just 10 bits.
Inventors:
Kazuhiro Mori
Application Number:
JP26351196A
Publication Date:
March 21, 2000
Filing Date:
September 12, 1996
Export Citation:
Assignee:
SHIMADZU CORPORATION
International Classes:
G06T1/00; G06T5/00; H04N1/407; H04N5/202; H04N5/325; H04N7/18; A61B6/00; (IPC1-7): G06T5/00; G06T1/00; H04N1/407; H04N5/202; H04N5/325; H04N7/18
Attorney, Agent or Firm:
Yusuke Sato
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