# US 5,703,923 A · Three dimensional imaging system using laser generated ultrashort x-ray pulser

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- Number: US 5,703,923 A
- Document ID: US5703923A
- Status: Granted
- Kind: A
- Application number: 08/748,501
- Filed: 1996-11-08
- Granted: 1997-12-30
- Earliest claimed: 1994-08-04
- Assignees: QEL Inc.
- Inventors: Michael J. Bardash
- Web page: https://patentgrep.com/patent/US5703923A

## CPC

- A61N 5/103: {Treatment planning systems}
- G21K 1/06: using diffraction, refraction or reflection, e.g. monochromators (G21K1/10, G21K7/00 take precedence)
- G21K 5/02: having no beam-forming means
- Y10S 378/901: Computer tomography program or processor
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)
- G21K: HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An apparatus for imaging the interior of an object illuminates the object with a source of picosecond collimated x-ray pulses. An array of x-ray detectors senses pulses of Compton scattered x-rays from the object and a processor accumulates the data to construct an image of the object by accumulating data from ellipsoidal sections of the object.

## Claims

### Claim 1

An apparatus for imaging the interior of an object located in a field of view volume comprising
a source of a ultra short collimated x-ray pulse emitted at a first time having a predetermined energy spectrum and direction passing through said field of view volume,
a detector array comprising a plurality of x-ray detectors each having timing and detection means to enable detection at a second time of the intensity of x-ray pulses Compton scattered by said object, wherein said second time follows said first time,
array signal processor means for receiving from said source of said x-ray pulse a signal indicative of said first time and for receiving from said detector array signals indicative of said second time and said intensity signal from said detector array and for transmitting image data indicative of the location and density of the scattering center producing the scattered radiation,
graphics processor means for receiving said image data from said array signal processor, wherein said image data may be stored and/or displayed on data display or data storage means.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein said array signal processor comprises data storage means and means to determine a time interval between said first and said second time and to store in said data storage means data corresponding to voxel locations in said field of view volume, wherein said data is incremented for each voxel element lying on an ellipsoidal surface in said field of view volume, said ellipsoidal surface having a semi-major axis length equal to half the said time interval multiplied by the speed of light and focal points at said source and said x-ray detector.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein said array signal processor further comprises means to accumulate data in said data array corresponding to each x-ray detector in said detector array until self consistent values are obtained.

### Claim 4 (depends on 2)

The apparatus of claim 2 wherein said data increment is equal to the intensity signal from said detector array divided by the number of voxels on said ellipsoidal surface.

### Claim 5 (depends on 1)

The apparatus of claim 1 wherein said source of ultra short x-rays comprises
an optical laser adapted to provide intense pulses to a photocathode to produce electrons,
electron accelerator means to increase the energy of said electrons and to direct them onto a target to produce x-rays by deceleration,
collimator means to allow a narrow conical bundle of said x-rays to impinge on said object in said field of view volume.

### Claim 6 (depends on 1)

The apparatus of claim 1 wherein said source of ultra short collimated x-rays comprises apparatus for therapeutic x-ray treatment of a patient and said data display is a three dimensional display of dosage received by the patient.

### Claim 7 (depends on 1)

The apparatus of claim 1 wherein said detector array comprises individual detectors at the corners of a regular polyhedron.

### Claim 8 (depends on 7)

The apparatus of claim 7 wherein said regular polyhedron is a cube.