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Fast scatter estimation in PET reconstruction.

A computer and sinogram technology, applied in the field of scattering estimation, can solve the problems of slow commercial nuclear medicine imaging systems, and achieve the effect of improving object throughput and fast image reconstruction

Active Publication Date: 2015-02-04
KONINKLJIJKE PHILIPS NV
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  • Application Information

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Problems solved by technology

It requires significant computation and is therefore very slow for commercial nuclear medicine imaging systems

Method used

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  • Fast scatter estimation in PET reconstruction.
  • Fast scatter estimation in PET reconstruction.
  • Fast scatter estimation in PET reconstruction.

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Embodiment Construction

[0023] The present invention utilizes Monte Carlo simulations to quickly derive the ratio between primary and scattered photon pairs in the PET data measured for each specific patient. Monte Carlo simulations are based on source distributions and decay maps. The derived ratios are used to scale the sinograms generated from single scatter simulations (SSS) such that the scaled sinograms closely approximate the total scatter in the measured sinograms. as in figure 2 As seen in , image 6 reconstructed using SSS with scaling factors derived from short Monte Carlo simulations eliminates the scanner over-reduction problem seen in FIG. 1 . Additionally, since only this ratio is required, there is no need to simulate a large number of events in the Monte Carlo simulation, and thus the additional computation time required is limited. In this way, more accurate scatter correction in PET reconstructions is performed for all different sizes of imaged objects without a significant increa...

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Abstract

An image processing apparatus includes a scatter simulation processor which processes measured sinograms generated from imaging data acquired for an imaging subject by an imaging apparatus to produce a scatter sinogram that represents a shape of scatter contribution. A scatter scaling processor utilizesa Monte Carlo simulation to determine a scatter fraction and scales the scatter sinogram to generate a scaled scatter sinogram that matches the scatter contribution in the measured sinogram. A reconstruction processor reconstructs the imaging data into an image representation using the scaled scatter sinogram for scatter correction.

Description

technical field [0001] The present application relates to the technical field of diagnostic imaging. It has particular application to accelerating the estimation of scatter in nuclear medicine scanners and will be described with particular reference to this application. However, it should be understood that it applies to other use cases as well, and is not necessarily limited to the aforementioned applications. Background technique [0002] In nuclear medicine imaging scanners, such as positron emission tomography (PET) scanners, typically 30% or more of detected coincidence events encounter at least one scatter during imaging. Accurate estimation of the amount of scattering is of great importance in nuclear medicine image reconstruction. Most commercial PET image reconstructions utilize single scatter simulation (SSS) methods to estimate scatter contributions. This method is accurate when the majority of scattering events are single scattering. However, when the patient...

Claims

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/005
Inventor J·耶
Owner KONINKLJIJKE PHILIPS NV
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