Direct charge readout electron radiography apparatus with improved signal-to-noise ratio

Patent · Tue Apr 18 04:00:00 EST 1978

OSTI ID:5776353

Swank, R K; Yang, K H

An improved direct charge readout electron radiography apparatus of the type having an upper electrode receiving differentially-absorbed X-radiation, a lower electrode including a plurality of parallel transparent, conductive strips overlaid with a layer of photoconductive material; and means for scanning a beam of light through the transparent strips and into the overlying photoconductive material layer for selectively transferring charge patterns induced therein responsive to the pattern of differentially-absorbed X-radiation, utilizes at least one lead means strip, positioned substantially transverse to, and spaced from the ends of, the plurality of conductive strips. The transverse lead means strip is connected to sequential ones of the parallel strips responsive to illumination of the photoconductive material in the area between the transverse strip and an adjacent end of each sequential parallel strip. The reduction in device capacitance in parallel with a device output signal facilitates an increase of about 100 times in the amount of readable charge, for equal exposures. Apparatus for optically scanning each conductive strip, while maintaining the connection thereof to the transverse lead means, is also disclosed. 39 claims.

• Assignee: General Electric Co.
• Patent Number(s): US 4085327
• OSTI ID: 5776353
• Country of Publication: United States
• Language: English

Related Subjects

440100* -- Radiation Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BIOMEDICAL RADIOGRAPHY
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
IMAGES
INDUSTRIAL RADIOGRAPHY
IONIZING RADIATIONS
MATERIALS TESTING
MEASURING METHODS
MEDICINE
NONDESTRUCTIVE TESTING
NUCLEAR MEDICINE
OPTICAL EQUIPMENT
OPTICAL SCANNERS
RADIATIONS
RADIOLOGY
TESTING
X RADIATION
X-RAY EQUIPMENT
X-RAY RADIOGRAPHY