Method and system for non-invasive imaging of a target region

Patent metadata

Field	Value
Publication number	US-9237874-B2
Application number	US-201213459585-A
Country	US
Kind code	B2
Filing date	Apr 30, 2012
Priority date	Apr 30, 2012
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

Embodiments of systems, methods and non-transitory computer readable media for imaging are presented. Preliminary image data corresponding to a first FOV of a subject at a first resolution is acquired using an imaging system including one or more radiation sources and at least one hybrid detector, specifically using at least one section of the hybrid detector having the first resolution. The target ROI is identified using the preliminary image data. Further, the subject is positioned to align the target ROI along a designated axis. Additionally, parameters associated with the sources, the hybrid detector and/or an imaging system gantry are configured for acquiring target image data at a second resolution greater than the first resolution using at least one section of the hybrid detector having the second resolution. Further, one or more images corresponding to at least the target ROI are reconstructed using the target and/or the preliminary image data.

First claim

The invention claimed is:

1. A method for imaging a subject, comprising:
acquiring preliminary image data corresponding to a first field of view of the subject at a first resolution using an imaging system comprising one or more radiation sources and a single hybrid detector responsive to radiation received from the one or more radiation sources, wherein the preliminary image data is acquired using at least one section of the hybrid detector comprising one or more detector elements having the first resolution and a first size, wherein the hybrid detector further comprises at least another section comprising one or more detector elements having a second resolution and a second size such that the detector elements having the second size are smaller than the detector elements having the first size;
identifying a target region of interest based on the preliminary image data;
positioning the subject so as to align the target region of interest along a designated axis;
configuring one or more parameters associated with the radiation sources, the hybrid detector, a gantry associated with the imaging system, or combinations thereof, wherein configuring the one or more parameters comprises:
operating in a multi-energy mode for the second resolution, wherein the multi-energy mode comprises switching tube voltage of the one or more radiation sources between one or more voltages;
selectively focusing on the section of the hybrid detector comprising one or more detector elements having the second resolution and the second size for acquiring target image data corresponding to the target region of interest at the second resolution using a target focal spot size, wherein the target focal spot size is smaller than a preliminary focal spot size used for acquiring the preliminary image data at the first resolution;
selectively switching the detector elements having the first size to a low resolution operating mode via a switching interface for acquiring the preliminary image data at the first resolution and selectively switching the detector elements having the second size to a high resolution operating mode via the switching interface for acquiring the target image data at the second resolution, wherein the second resolution is greater than the first resolution; and

reconstructing one or more images corresponding to at least the target region of interest using the target image data, the preliminary image data, or a combination thereof, wherein the combination of operating in the multi-energy mode, selectively focusing on the target focal spot size, and selectively switching to the high resolution operating mode is configured to reduce dosage administered to the subject.

2. The method of claim 1 , wherein the preliminary image data is acquired using the entire hybrid detector.

3. The method of claim 1 , wherein configuring one or more parameters comprises collimating the one or more radiation sources to focus on the section of the hybrid detector having the second resolution for acquiring the target image data.

4. The method of claim 1 , further comprising determining the first resolution by summing signal received from a plurality of detector elements in the hybrid detector and determining the second resolution by having each of the plurality of detector elements of the hybrid detector read out individually.

5. The method of claim 1 , wherein the one or more radiation sources comprise distributed radiation sources, and wherein at least one of the distributed radiation sources is configured to focus on the section of the hybrid detector having the first resolution for acquiring the preliminary image data, and at least another of the distributed radiation sources is configured to focus on the section of the hybrid detector having the second resolution for acquiring the target image data.

6. The method of claim 1 , wherein the multi-energy mode further comprises switching the hybrid detector between at least one of an energy-integrating mode and a photon counting mode for acquiring the preliminary image data at the first resolution and acquiring the target image data at the second resolution, respectively.

7. The method of claim 1 , further comprising analyzing the one or more images corresponding to at least the target region of interest for determining one or more of an anatomical structure, size, thickness, eccentricity, density, mass, composition and nature of a nodule, a lesion, a stenosis, plaque, or combinations thereof, of biological tissues corresponding to the target region of interest.

8. The method of claim 1 , further comprising analyzing one or more of the preliminary image data and the target image data to determine if the imaging system is centered on a desired region of interest of the subject.

9. The method of claim 1 , wherein identifying the target region of interest comprises detecting a structural anomaly by evaluating the preliminary image data, using operator input, automated tools, computer aided analysis, prior examination data, or combinations thereof.

10. The method of claim 1 , wherein positioning the subject comprises centering the target region along a longitudinal axis of rotation of the gantry.

11. The method of claim 1 , wherein positioning the subject comprises centering the target region at iso-center in a transaxial plane.

12. The method of claim 1 , wherein reconstructing one or more images comprises using interior tomographic reconstruction using truncated projection data to generate one or more images corresponding to the target region of interest.

13. The method of claim 1 , wherein reconstructing one or more images comprises using sinogram data generated from the preliminary image data to supplement sinogram data generated from the targeted scan for use in reconstructing the one or more images corresponding to the target region of interest.

14. A method for imaging a subject, comprising:
acquiring preliminary image data corresponding to a first field of view of the subject at a first resolution using an imaging system comprising one or more radiation sources and at least one hybrid detector responsive to radiation received from the one or more radiation sources, wherein the preliminary image data is acquired by selectively switching a desired set of detector elements in at least one section of the hybrid detector having the first resolution and a first size to a low resolution operating mode via a switching interface;
automatically identifying a target region of interest based on the preliminary image data;
configuring one or more parameters associated with the radiation sources, the hybrid detector, a gantry associated with the imaging system, or combinations thereof, wherein configuring the one or more parameters comprises:
operating in a multi-energy mode for the second resolution, wherein the multi-energy mode comprises switching tube voltage of the one or more radiation sources between one or more voltages;
selectively focusing on another section of the hybrid detector comprising one or more detector elements having the second resolution and the second size for acquiring target image data corresponding to the target region of interest at the second resolution using a target focal spot size, wherein the target focal spot size is smaller than a preliminary focal spot size used for acquiring the preliminary image data at the first resolution;
selectively switching the detector elements having the second resolution and the second size in the hybrid detector to a high resolution operating mode via the switching interface for tracking the target region of interest and acquiring target image data corresponding to the targ

Assignees

• Deman Bruno Kristiaan Bernard
• Miller James Vradenburg
• Jansen Floribertus P M Heukensfeldt
• Gen Electric

Inventors

• Deman Bruno Kristiaan Bernard
• Miller James Vradenburg
• Jansen Floribertus P M Heukensfeldt

Classifications

• G06T12/10

  Image preprocessing, e.g. calibration, positioning of sources or scatter correction · CPC title

• A61B6/488

  involving pre-scan acquisition · CPC title

• A61B6/482

  involving multiple energy imaging · CPC title

• A61B6/469

  for selecting a region of interest [ROI] · CPC title

• A61B6/4417

  related to combined acquisition of different diagnostic modalities · CPC title