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METHOD FOR CO-REGISTERING MULTIMODALITY IMAGING PLANES

IP.com Disclosure Number: IPCOM000218792D
Publication Date: 2012-Jun-07
Document File: 5 page(s) / 89K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method for co-registering multimodality imaging planes using fiducial markers is provided. A lateral transfer board which is used to move a patient from a PET/CT to an MR scanner during PET/CT and MR multi-modality scanning session is embedded with three fiducial markers. During imaging, images are acquired to include all three fiducial markers on each of the imaging modalities such as PET, CT and MRI. The fiducial markers are designed such that the said markers are visible in CT and MR, and placed in the transfer board in a way that the markers are always within a single field of view of both imaging modalities. After images are acquired on PET/CT and MR, post-processing software fuses and co-registers corresponding images based on position of fiducial markers as visible in respective images.

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METHOD FOR CO-REGISTERING MULTIMODALITY IMAGING PLANES

FIELD OF INVENTION

The invention generally relates to medical imaging and more particularly to a method for co-registering multimodality imaging planes using fiducial markers.

BACKGROUND OF THE INVENTION

Positron emission tomography (PET) imaging provides clinicians with functional information of anatomy at a molecular level.  Computed tomography (CT) imaging provides morphological information of anatomy based on X-ray attenuation and aids in the identification of structure of bones and lungs.  However, both PET and CT have limited soft tissue and brain contrast.  Magnetic resonance imaging (MRI) provides additional morphological information of anatomy as well as good contrast of soft tissues and brain.  Advanced imaging involves hybrid multi-modality imaging.  To get maximum information out of hybrid multi-modality imaging techniques, it is critical to have datasets acquired on different scanners accurately co-registered.

Conventionally, PET/CT images are acquired on a PET/CT scanner and MR images are acquired on a MR scanner.  PET/CT table is designed such that, when the table is extended into the bore for imaging, it is supported only at one end (inferior or foot end), thus making the superior, or head end, of the table cantilevered.  MR table is designed such that when it travels into the bore for imaging, it continues riding on a level bridge, and there is no change in its height and levelling.  Different designs of the said PET/CT and MR tables create a challenge for the registration of images of same anatomy acquired on the two scanners.  Further, sag caused by PET/CT table is not constant and not predictable, therefore achieving image co-registration poses a challenge.

Hence there exists a need for a system and method for co-registering multimodality imaging planes so as to improve clinical workflow and acquire maximum benefit of hybrid multi-modality imaging.

BRIEF DESCRIPTION OF THE INVENTION

A method for co-registering multimodality imaging planes using fiducial markers is provided.  The invention disclosed herein suggests addition of three fiducial markers in the lateral transfer board used to transfer the patient between the PET/CT and the MR systems.  The fiducial markers are designed such that the said markers are visible in CT and MR, and placed in the transfer board in a way that the markers are always within a single field of view of both imaging modalities.  After images are acquired on PET/CT and MR, post-processing software fuses and co-registers corresponding images based on position of the fiducial markers as visible in respective images.


DETAILED DESCRIPTION OF THE INVENTION

A method for co-registering multimodality imaging planes using fiducial markers is provided.  A lateral transfer board is used to move a patient from a PET/CT to an MR scanner during PET/CT and MR multi-modality scanning session.  To ensure the resulting fused images are perfectly...