Filter System And Method For Imaging A Subject

An imaging system configured to acquire a selected dose x-ray image projections of a subject, comprising:

• a source configured to emit x-rays as a whole beam with a first energy spectra;
• a filter assembly, including:
• a filter member configured to limit a transmission x-rays to a filtered beam with a second energy spectra that has a different HVL than the first energy spectra,
• a filter carrier configured to move the filter member relative to the whole beam;
• a detector configured to detect the whole beam and the filtered beam;
• a control system configured to control the position of the filter member with the filter carrier to selectively acquire projections of the subject;
• wherein the control system is configured to execute instructions to control movement of the filter carrier to position the filter member in filtering position and a non-filtering position;
• wherein the filter member limits the whole beam to the filtered beam in the filtering position;
• wherein a selected number of projections are acquired to reconstruct a model of the subject.

A method of acquiring a limited x-ray dose image projection of a subject, comprising:

• acquiring image data at a plurality of positions relative to the subject;
• operating a source to emit x-rays as a whole beam at a sub-plurality of positions of the plurality of positions relative to the subject;
• controlling a filter assembly to move a filter member into the emitter whole beam to form a filtered beam,
• detecting with a detector the whole beam and the filtered beam;
• and
• executing instructions with a processor module to reconstruct a model of a selected portion of the subject with image data acquisition of the subject using both the whole beam and the filtered beam.