Portable, digital X-ray apparatus for producing, storing and displaying electronic radioscopic images

• US 5,909,478 A
• Filed: 05/11/1998
• Issued: 06/01/1999
• Est. Priority Date: 06/23/1995
• Status: Expired due to Term

• Current Assignee: Leidos, Inc. (Leidos Holdings, Inc.)
• Original Assignee: Science Applications International Corporation
• Inventors: Smith, Scott T., Polichar, Raulf M.
• Primary Examiner(s): Porta, David P.
• Application Number:
  US09/076,604
• Time in Patent Office: 386 Days
• Field of Search: 378/98.8, 378/98.2, 378/98.3, 378/98.4, 378/98
• US Class Current: 378/98.2
• CPC Class Codes: G01N 23/04 and forming images of the material
• CPC Class Codes: G01V 5/22 Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
• CPC Class Codes: G01V 5/271 using a network, e.g. a remote expert, accessing remote data or the like
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

A portable, self-contained, electronic radioscopic imaging system uses a pulsed X-ray source, a remote X-ray sensor, and a self-contained, display and controller unit to produce, store, and/or display digital radioscopic images of an object under investigation. The pulsed X-ray source transmits a burst of narrow pulses of X-rays at the object being investigated at a low repetition rate. The X-ray sensor utilizes an X-ray scintillating screen in combination with either an integrating CCD camera, or an active matrix of thin film transistors and sample-and-hold photodiodes, to produce an integrated signal representative of the accumulated number of flashes of radiation (X-ray pulses that pass through the object) that are sensed in a given pixel area of the scintillating screen. The self-contained display and controller unit utilizes digital signal processing within an enhanced portable computer, including a flat solid state display panel and associated drive circuitry, in order to display the full dynamic range and resolution of the sensor. A modem allows the digitized image to be sent to a remote location where the exact same image can be recreated for analysis by off-site experts.

Claims

1. A self-contained, electronic radioscopic imaging system for investigating an object comprising:

a remote X-ray sensor positioned on one side of the object under investigation so that X-rays originating from the other side of the object pass through the object and impinge thereon, the remote X-ray sensor including a scintillating screen that produces flashes of radiation when impinged by an X-ray, a CCD camera positioned off line from the X-rays that strike the scintillating screen, optical path means for directing the flashes of radiation from the scintillating screen to the CCD camera, and pixel integrating means for integrating the flashes of radiation to produce an integrated pixel signal for each pixel area of the scintillating screen, which integrated pixel signal represents the sum of all the flashes of radiation produced by X-rays that pass through the object in its respective pixel area over a prescribed time period; and

a self-contained, display/control unit coupled to the X-ray sensor, the display/control unit including analog-to-digital conversion means for converting the integrated pixel image signal from each respective pixel area into a digital signal, digital image signal processing means for processing the converted pixel image signal from each respective pixel area and converting all such integrated pixel image signals to a full-scale digitized image signal, and a display for visually presenting the full-scale digitized image signal thereon.

2. The self-contained imaging system of claim 1 wherein said display/control unit includes modem means for transferring the full-scale digitized image signal to a remote location.

3. The self-contained imaging system of claim 2 wherein said display/control unit is housed in a transportable housing.

4. The self-contained imaging system of claim 1 wherein the optical path means includes a front surface mirror (44) and a lens (46) the front surface mirror being positioned behind the scintillating screen (42) in line with the X-rays that strike the scintillating screen so as to direct the image of the scintillating screen to the CCD camera through the lens, the front surface mirror being made of a material through which X-rays readily pass.

5. The self-contained imaging system of claim 4 further including a shield (50) made from an X-ray absorbing material positioned around the CCD camera and pixel integrating means to shield the CCD camera and pixel integrating means from stray X-rays.

6. The self-contained imaging system of claim 5 wherein the scintillating screen has approximate dimensions of at least 10.3 inches wide by 12 inches high.