Title:
【発明の名称】診断イメージ処理システムと方法及びスイープコントロール回路
Document Type and Number:
Japanese Patent JP3208449
Kind Code:
B2
Abstract:
A patient (12) is irradiated with x-rays (10) from an x-ray tube (A). X-rays that have passed through a region of interest of the patient are converted to a light image by a phosphor screen (14) on the dome shaped input face (16) of an image intensifier (B). The dome shaped input face causes the output optical image (20) of the image intensifier to be distorted with pin cushion distortion. The sweep pattern of the electron beam of a video pick up tube (24) of a video camera (C) is controlled by deflection plates (26a, 26b, 26c, 26d). A sweep control circuit (D) alters the sweep pattern such that image signals from the video camera are distorted so as to cancel the image intensifier tube distortion, so that a man-readable image (28) displayed on a video monitor (22) is substantially distortion-free. The sweep control circuit alters conventional vertical sweep control voltage ramps (V) and horizontal control voltage ramps (H) by adding third order, parabolic terms.
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Inventors:
Robert Jay Vagi
Leonard F. Plut
David Elle Leong
Leonard F. Plut
David Elle Leong
Application Number:
JP27352390A
Publication Date:
September 10, 2001
Filing Date:
October 15, 1990
Export Citation:
Assignee:
Picker International, Inc.
International Classes:
A61B6/00; H04N3/233; H04N5/32; H04N7/18; (IPC1-7): H04N7/18; H04N5/321
Domestic Patent References:
| JP5379395A | ||||
| JP53135592A | ||||
| JP5138892A |
Attorney, Agent or Firm:
Nobuyuki Iida