Spatial sampling improvements to list-mode pet acquisitions using planned patient table/gantry motion

A technology of circular motion and longitudinal motion, applied in patient positioning for diagnosis, computerized tomography scanners, instruments for radiological diagnosis, etc., can solve problems such as limiting the resolution of PET images, achieve a large effective field of view, and improve images The effect of resolution

Inactive Publication Date: 2016-08-17
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limited crystal size of PET scanners, PET acquisitions always have limited sampling of the FOV (in axial and transverse directions), which limits PET image resolution

Method used

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  • Spatial sampling improvements to list-mode pet acquisitions using planned patient table/gantry motion
  • Spatial sampling improvements to list-mode pet acquisitions using planned patient table/gantry motion

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Embodiment Construction

[0015] figure 1 A multi-modality system 10 is shown that implements a workflow that utilizes planned patient table / gantry motion to acquire list-mode events at different spatial sampling locations for improved accuracy with respect to image resolution. Spatial sampling of PET data. The workflow detailed below utilizes planned table / gantry motion during data acquisition. In this way, each crystal is able to cover a different spatial position during the scan, which enables finer PET acquisition sampling in the field of view (FOV). With accurate knowledge of patient table and gantry motion and timing, the Line of Response (LOR) for each list mode event can be calculated based on the timing of the event and planned motion. Motion can be short distances, such as single or multiple half-crystal lengths. Table motion will primarily benefit axial sampling, while gantry rotation-like motion can improve lateral sampling. Additionally, table motion can help increase the scan axis FOV...

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Abstract

A PET apparatus includes a detector array including individual detectors that receive radiation events from an imaging region. A motion controller controls at least one of relative longitudinal motion between the subject support and the detector array and circular motion between the detector array and the subject. A timestamp processor assigns a timestamp to each received radiation event. The list-mode event storage buffer stores time-stamped events. The event verification processor screens the radiation events for consistent reception and each pair of corresponding consistent reception events defines the position of the response line. A reconstruction processor reconstructs valid events into an image representation of the imaging region.

Description

technical field [0001] This application relates to the field of diagnostic imaging. The present application finds particular application in utilizing planned patient table and / or gantry motion for improved spatial sampling of list-mode PET acquisitions. However, it should be understood that the present application is also applicable to other devices and is not necessarily limited to the above applications. Background technique [0002] Nuclear imaging devices, such as positron emission tomography (PET) scanners, reconstruct images from lines of response (LOR) in the field of view (FOV). The image value for a voxel is generated by summing the contribution of each LOR intersected by that voxel. In list-mode acquisition, events are logged individually to a list file and are treated as individual data points for use in reconstruction. In current clinical PET imaging, PET data acquisition is usually performed at a fixed patient table location. Both the scanner and patient tab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03A61B6/04G01T1/29G06T11/00
CPCA61B6/037A61B6/04A61B6/5205A61B6/547G01T1/1647
Inventor C-H·通B·张C·戴
Owner KONINKLJIJKE PHILIPS NV
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