Method for forming energy subtraction images

Details Method for forming energy subtraction images Method for forming energy subtraction images

1992-04-10

1994-04-05

Envall, Jr., Roy N.

Boots, shoes, and leggings

36441322, 250582, 358500, G06F 1500

Patent

active

053011074

ABSTRACT:
In energy subtraction processing, a filter for filtering out radiation having a low energy level is located between first and second recording media. Radiation, which has passed through an object, is irradiated from the side of the first recording medium such that only the radiation having a high energy level may impinge upon the second recording medium, radiation images of the object being thereby recorded on the two recording media. Image signals representing the radiation images are subtracted from each other, and an image signal representing an energy subtraction image is thereby obtained. The subtraction process is not carried out on high frequency components of the image signals representing the radiation images and is carried out only on low frequency components of the image signals such that an image signal representing an energy subtraction image having improved graininess may be obtained. A stimulable phosphor sheet is utilized as the filter for filtering out radiation having a low energy level. High frequency components of an image signal, which represents image information stored on the stimulable phosphor sheet, are added to the image signal representing the energy subtraction image, and an image signal representing an energy subtraction image, the graininess of which has been improved even further, is thereby obtained.

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