Image acquisition method and apparatus

An image acquisition apparatus, comprising:

• a sensor for two-dimensionally sampling a radiation transmission distribution on an object to be imaged at desired sampling intervals;
• and
• a scattered ray removing grid for removing scattered rays, which is used without being moved during acquisition of an image by said sensor,
• wherein intervals of elements of said scattered ray removing grid are set such that a spatial frequency of a stripe pattern, in the image, which originates from said scattered ray removing grid becomes not less than 30% of a sampling frequency that is the reciprocal of the sampling intervals.

An image acquisition apparatus, comprising:

• a sensor for two-dimensionally sampling a radiation transmission distribution on an object to be imaged at desired sampling intervals;
• and
• a scattered ray removing grid for removing scattered rays, which is used without being moved during acquisition of an image by said sensor,
• wherein intervals of elements of said scattered ray removing grid are set such that a spatial frequency of a stripe pattern, in the image, which originates from the scattered ray removing grid becomes fs(n+0.3)˜fs(n+0.4) or fs(n+0.6)˜fs(n+0.8) [cyc/mm] where 1/fs [mm] is the desired intervals (fs is an arbitrary positive number) and n is an integer not less than 0.

An image acquisition apparatus, comprising:

• image acquisition means for radiating radiation by using a scattered ray removing grid and acquiring an image by two-dimensionally sampling a radiation transmission distribution on an object to be imaged at desired intervals;
• image processing means for removing a stripe pattern originating from the scattered ray removing grid from the acquired image by image processing;
• and
• selection means for allowing selection between removal and nonremoval of the stripe pattern originating from the scattered ray removing grid by using said image processing means.

An image acquisition method, comprising:

• (a) the step of radiating radiation by using a scattered ray removing grid and acquiring an image by two-dimensionally sampling a radiation transmission distribution on an object to be imaged at desired intervals;
• (b) the step of selecting between removal and nonremoval of a stripe pattern originating from the scattered ray removing grid from the acquired image by image processing;
• and
• (c) the step of removing the stripe pattern originating from the scattered ray removing grid by image processing in accordance with the selection.