Fluoroscopy apparatus for forming layer images of a three-dimensional object

• US 4,513,433 A
• Filed: 03/22/1984
• Issued: 04/23/1985
• Est. Priority Date: 10/04/1980
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Linde, Rolf, Klotz, Erhard, Weiss, Hermann, Tiemens, Ulf
• Primary Examiner(s): Church, Craig E.
• Application Number:
  US06/592,319
• Time in Patent Office: 397 Days
• Field of Search: 378/2, 378/23
• US Class Current: 378/2
• CPC Class Codes: A61B 6/025 Tomosynthesis
• CPC Class Codes: G01N 23/043 using fluoroscopic examination, with visual observation or video transmission of fluoroscopic images
• CPC Class Codes: G01N 23/044 using laminography or tomosynthesis

Abstract

Apparatus for the layer-wise imaging of an object by means of a large number of radiation sources which are situated in a radiation source plane and whose radiation beams intersect one another so that the approximately equally large radiation beam cross-sections which are situated in one irradiation plane almost completely cover one another. A record carrier is arranged on the other side of the object in order to record perspective images produced by the radiation beams. A imaging matrix which comprises imaging elements for the superposition of the perspective images on an image display device is disposed behind the record carrier. Displacement means are provided in order to realize a relative movement between the irradiation plane and the object or an object table carrying the object.

Claims

1. Apparatus for layer-wise imaging of an object (6) comprising:

a plurality of radiation source means (2), which are disposed adjacent the object in a single radiation source plane (1), each of which projects a beam (4) of penetrating radiation through the object in a geometry wherein all of the radiation beams have approximately the same cross section area in an irradiation plane (8) which intersects the object and all of the beams cover substantially the same region of the irradiation plane;

record carrier means (10), disposed on the opposite side of the object from the radiation source plane to receive the radiation beams which have passed through the object and to record therefrom perspective images of the object which are formed by the radiation beams;

image display means (15) including an image receiving surface (16);

imaging matrix means (13), comprising a plurality of imaging elements (14) which are disposed in a geometry which corresponds to the distribution of the radiation source means in the radiaton source plane, whih produce an image of a layer within the object by superpositioning the perspective images on the image receiving surface; and

means (28) for producing a relative displacement between the position of the irradiation plane and the object in a direction perpendicular to the irradiation plane.

2. The apparatus of claim 1 wherein the radiation source means, the record carrier, and the imaging matrix means form a single structural unit and occupy fixed positions with respect to one another and wherein the means for performing a relative displacement displace the structural unit with respect to the object.

3. The apparatus of claim 1 further comprising a planar diaphragm disposed parallel to the radiation source plane between the radiaton source plane and the object, said diaphragm defining a plurality of apertures which are distributed therein and function to form the radiation beams;

and

means for displacing the position of the apertures in the plane of the diaphragm to change the distances between the various apertures while maintaining the angular relationship therebetween to affect a true-to-scale variation in the size of the distribution of apertures.

4. The apparatus of claim 1 further comprising means for rotating the radiation source means and the record carrier with respect to the object.

5. The apparatus as claimed in any one of claims 1 through 3 wherein the record carrier comprises a material having an afterglow time which is sufficiently long to effect storage of the perspective images after an irradiation.

6. The apparatus as claimed in any one of claims 1 through 3 wherein the image display means is an image intensifier.

7. The apparatus of claim 1 wherein the imaging elements comprise objective lenses.