Image generation device with optimized dose control
AssigneeKoninklijke Philips N.V.
InventorsJens Wiegert, Matthias Bertram
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Abstract
The present invention relates to an image generation device for generating an image from measured data, wherein image quality is optimized for a region of interest and to an imaging system comprising this image generation device. The image generation device comprises a noise determination unit for determining a distribution of noise in a projection domain of the region of interest, and a dose control unit (32) for determining a dose profile for a radiation source (2) of said image generation device based on said determined distribution of noise by using a noise propagation algorithm. Thereby, signal-to-noise ratio of a reconstructed volume can be improved and is not sensitively dependent on a selected region of interest.
Claims21
An image generation device for generating an image from measured data generated by an imaging system, wherein the imaging system includes a radiation source and a power supply for the radiation source, and wherein an image quality of the image is optimized for a region of interest in the image, the image generation device comprising:
- a noise determination unit that determines, in a projection domain, an expected distribution of noise of individual projections of second data for the region of interest;
- a dose control unit that determines a dose profile for the region of interest based on said determined distribution of noise of the individual projections using a noise propagation algorithm;
- wherein the dose control unit controls the power supply based on the dose profile so as to control a radiation intensity generated by the radiation source during tomographic imaging, with the imaging system, that generates the measured data;
- and
- an image generation unit that processes the measured data and generates the image from the measured data.
An imaging system comprising:
- a radiation source. which is powered by a power;
- a power supply that supplies the power to the radiation source;
- a noise determination unit that determines an expected distribution of noise, in a projection domain, of ndividual projections of second data for a region of interest in a volume to be reconstructed;
- a dose control unit that determines a dose profile for the region of interest based on the determined distribution of noise of the individual projections using a noise propagation algorithm;
- a dose modulation processor that controls the power supply based on the dose profile so as to control a radiation intensity generated by the radiation source during tomographic imaging that generates measured data;
- a measured data generation unit that generates the measured data;
- and
- an image generation device that generates said image from the measured data.
An image generation method for generating an image from measured data, wherein image quality is optimized for a region of interest, the image generation method comprises following steps:
- determining an expected distribution of noise of individual projections of the measured data, in a projection domain, of the region of interest;
- determining a dose profile for the region of interest based on said determined distribution of noise of the individual projections of the measured data by using a noise propagation algorithm;
- Controlling, based on the dose profile, a radiation intensitygenerated during tomogrphic imaging that generates the measured data;
- and
- processing the measured data to generate the image from the measured data.
Dependencies are inferred from the claim text.