Re-binning method for nuclear medicine imaging devices
AssigneeSiemens Medical Solutions USA, Inc.
InventorA Vija
Life of this patent
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Abstract
A generalized rebinning method transforms SPECT projection data acquired with a first type of collimator into projection data as if it were acquired with a second type of collimator, for subsequent reconstruction using a 3-D algorithm devised for the second type of collimator. The method includes use of a non-stationary point-spread function in the conversion to account for image blurring.
Claims40
A method for converting projection data acquired by a nuclear medical imaging device using a first collimator into projection data as if the acquired data were acquired with a second collimator, said method comprising the steps of:
- a) modeling said first and second collimators with first and second mathematical models;
- b) receiving raw object projection data acquired using said first collimator;
- and
- c) iteratively projecting the raw object projection data backward and forward through the first and second mathematical models to generate estimated projection data as object projection data as if acquired with said second collimator.
A method for converting projection data acquired by a nuclear medical imaging device using a first collimator into projection data as if it were acquired with a second collimator, said method comprising:
- a) receiving raw object projection data acquired using a first collimator;
- b) projecting the raw object projection data backward through a first model physically modeling said first collimator to obtain first estimated object data;
- c) projecting the first estimated object data forward through a second model physically modeling said second collimator to obtain estimated second collimator projection data;
- d) projecting the estimated second collimator projection data backward through said second model to obtain second estimated object data;
- e) projecting the second estimated object data forward through said first model to obtain estimated first collimator projection data;
- f) comparing said estimated first collimator projection data with said raw projection data;
- g) adjusting said first and second models based upon the results of said comparison step;
- and
- h) iterating steps (c)-(g) until said comparing step results in a near zero delta.
A method for converting SPECT projection data acquired with an imaging device utilizing a first collimator into estimated SPECT data as if it were acquired with a second collimator, said method comprising the steps of:
- acquiring raw object data using a first collimator;
- converting said raw data to estimated second collimator data based on geometric mapping from said first collimator to said second collimator;
- and
- performing resolution compensation of said estimated collimator data to generate estimated second collimator data.
A nuclear imaging device, comprising:
- a detector configured to receive radiation from a radiation field and output raw projection data of a distribution of said radiation field;
- a first collimator of a first type that filters radiation from said radiation field to said detector;
- and
- processing means for receiving raw projection data from said detector and for converting said raw projection data into estimated projection data as if it were acquired with a second collimator, with a model of said first collimator and a model of said second collimator;
- wherein said first collimator is a different type of collimator than said second collimator.
A computer program product embodied as computer-executable instructions stored on a computer readable medium, for converting object projection data for use in nuclear medical imaging, said program product comprising:
- a first program segment for receiving raw object projection data from a nuclear imaging device, said raw object projection data acquired with a first collimator;
- and
- a second program segment for converting said raw object projection data to estimated projection data as if it were acquired with a second collimator utilizing a model of said first collimator and a model of said second collimator;
- wherein said first collimator is a different type of collimator than said second collimator.
Dependencies are inferred from the claim text.