Spot-size effect reduction

Details Spot-size effect reduction Spot-size effect reduction

2005-05-06

2008-08-26

Kao, Chih-Cheng G (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Absorption

C378S019000, C378S065000, C378S098300

Reexamination Certificate

active

07418078

ABSTRACT:
A radiographic imaging device includes an X-ray source having a finite focal spot characterized by a determined intensity distribution. The X-ray source emits a beam of X-ray radiation toward an object. A detector assembly receives at least part of the X-ray radiation after it passes through the object. The detector assembly produces a signal in response to the received radiation. An image processor constructs an image from the signal generated by the detector assembly using the determined intensity distribution of the X-ray source. By inverse filtering the aggregated detector image from the detector assembly, the effects of the finite focal spot size of the X-ray source are mitigated, improving the quality of the resulting image.

REFERENCES:
patent: 4497062 (1985-01-01), Mistretta et al.
patent: 4872187 (1989-10-01), Nakahata et al.
patent: 5235191 (1993-08-01), Miller
patent: 5757951 (1998-05-01), Tuy
patent: 5878108 (1999-03-01), Baba et al.
patent: 6031892 (2000-02-01), Karellas

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