Title:
X-RAY COMPUTED TOMOGRAPH AND ITS PROJECTION DATA COLLECTING METHOD
Document Type and Number:
WIPO Patent Application WO/2004/006771
Kind Code:
A1
Abstract:
An X-ray computed tomograph for forming a sharp reconstructed image of a heart and a coronary artery. The diastolic phase between R-waves of an electrocardiogram is divided into a rapid inflow period, a slow inflow period, and atrial systole period. The rapid inflow period is a period during which blood rapidly flows in a ventricle, the heart moves, and collection of projection data is not suited. The slow inflow period is a period during which the movement of the heart is most quite and collection of projection data is suited. The atrial systole period is a period during which the ventricle moves when the atria contracts, and collection of projection data is hardly influenced. When a projection data collection window of the X-ray computed tomograph is 250 ms, and when the heart beat rate is less than 65/minute, the final stage of the data collection window is set at or around the peak of the P-wave. When the heart beat rate is more than 65/minute, the final stage of the 1/2 data collection window is set at or around the peak of the R-wave. Thus a two-phase system is used.
Inventors:
SATO YUHICHI (JP)
Application Number:
PCT/JP2003/008839
Publication Date:
January 22, 2004
Filing Date:
July 11, 2003
Export Citation:
Assignee:
UNIV SCHOOL NIHON JURIDIC PER (JP)
SATO YUHICHI (JP)
SATO YUHICHI (JP)
International Classes:
A61B5/352; A61B5/366; A61B6/00; (IPC1-7): A61B6/03
Foreign References:
| JP2000262519A | 2000-09-26 | |||
| JPH0924045A | 1997-01-28 | |||
| JPS53123693A | 1978-10-28 |
Other References:
YASUFUMI ANDO: "0.4s/rot MSCT(Aquilion) ni yoru shinzo satsuei-ho no kaihatsu", MEDICAL REVIEW, vol. 26, no. 1, 28 February 2002 (2002-02-28), pages 2 - 10, XP002974138
Attorney, Agent or Firm:
Asamura, Kiyoshi (New Ohtemachi Bldg. 2-1, Ohtemachi 2-chom, Chiyoda-ku Tokyo, JP)
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