Browse Prior Art Database

X-RAY DETECTOR ARRAY

IP.com Disclosure Number: IPCOM000023967D
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 4 page(s) / 652K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present invention relates to a linear X-ray detector which can be utilized in computerized axial tomography (CAT) and conventional shadowgraph radiography and which is constructed as follows: The linear X-ray detector 1 comprises a bar 2 made out of insulating material such as glass or some dimensionally stable plastic, on the surface of which conductive strips 3 are deposited l,-mto 5,-mthick as shown in Figure 1.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 4

XEROX DISCLOSURE JOURNAL

X-RAY DETECTOR ARRAY

Lothar S

0 3eromin

Proposed Classification

U 05, CL 250/315 R

mt 0 Cl. G03g 13/00

9

,uj~

FIG.FIG, I 2

/0

1/

/5

/2

TO AMPLIflERS 6

/4

FIGS 4

Volume 4 Number 3 May/3une 1979 319

F/G.3

[This page contains 1 picture or other non-text object]

Page 2 of 4

X-RAY DETECTOR ARRAY (Cont~d)

5

2/

The present invention relates to a linear X-ray detector which can be utilized in

computerized axial tomography (CAT) and conventional shadowgraph radiography

and which is constructed as follows:

The linear X-ray detector 1 comprises a bar 2 made out of insulating material such as glass or some dimensionally stable plastic, on the surface of which conductive strips 3 are deposited l,~mto 5,~mthick as shown in Figure 1.

  XEROX DISCLOSURE JOURNAL Volume 4 Number 3 May/June 1979

22

23

24

FIG. 5

320

[This page contains 1 picture or other non-text object]

Page 3 of 4

X-RAY DETECTOR ARRAY (Cont~d)

For application in conventional radiography the conductive strips electrodes 3 are approximately 175,~mwide and 2 mm long and the distance between two adjacent strips is approximately 25 ~ m. The maximum length of the linear array is approximately 14 inches. Typical dimensions for application of this linear array in CAT is as follows:

Strip electrode width: 3 mm

Strip electrode length: 10 mm Gap between electrodes: 3 mm

A layer of photoconductive material 4 such as selenium or germanium is deposited on the bar 2 covering strip electrodes 3 and the gaps to a thickness of 300 to 500

pm or thicker (the thicker the photoconductive material, the better the X-ray photon absorption). Each strip electrode 3 is connected to a wire 5 to allow electrical connection to amplifier 6 (only one such connection is illustrated), An X- ray transparent bias electrode 7 is deposited over the photoconductive layer 3 along

the entire length of the bar 2. For the detector 1 to be used in conventional radiography the bias electrode 7 is about 200,~&mwide, for CAT it is about 10 mm wide. The strip electrodes 3 and the bias electrode 7 make good ohmic contact

with the photoconductive material 4. An alternate construction technique for the linear array which lends itself to the fabrication of the CAT array is shown in Figure 2, which comprises individual photoconductive cells 8 arranged in a linear array, the photoconductive cells being electrically isolated by spacers 9.

In order for the detectors described hereinabove to generate electronic signals that

facilitate the reproduction of an X-ray image with a finite resolution, it is used as shown in Figure...