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Real-time list mode reconstruction

By monitoring the position of the object support surface and recording the gamma ray reception time, the data in the PET scanner is analyzed and reconstructed in real time, which solves the problem of delay in the PET scanner data acquisition and reconstruction process, achieves rapid image reconstruction, and increases processing throughput.

Active Publication Date: 2007-12-12
KONINKLIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it is currently stopped, there will always be a delay between the start of data acquisition and the start of reconstruction

Method used

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Examples

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Embodiment Construction

[0015] Referring to Figure 1, a preferred embodiment of a nuclear medicine scanner 10 is shown. The object is placed on the object support surface 12 prior to scanning. The object support surface moves along its longitudinal axis A into and out of the cavity 14 of the gantry 16 of the scanner 10 . The lumen of the PET scanner is lined with the cylinder of the radiation detector 18 . Optionally, the detector comprises a plurality of detection heads. In either case, detectors 18 are positioned around and along the subject receiving lumen 14 to receive nearly simultaneously incident gamma rays. Typically, incident gamma rays impinge on a detector 18, which preferably includes a scintillation crystal and a photodetector array, although solid state, Anger-type and other detectors are also contemplated. When the scintillation crystals are struck by gamma rays, they emit small pulses of visible light, which are detected by photodetectors and converted into electrical signals. A s...

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Abstract

In positron emission tomography, a nuclear medicine scanner (10) is used to detect gamma-ray events generated by positron annihilation events. Molecules of known behavior are labeled with radioactive isotopes that decay into pairs of gamma rays that are detected coincidentally, ie in a nearly simultaneous manner, by radiation detectors (18). A time recorder (22) and subject support monitor (26) indicate the time when the coincident gamma rays were detected and the position of the subject. The storage buffer (28) collects gamma ray detection time and position and support position. A batch of data acquired in the buffer (28) is reconstructed (48) into an overlapping portion of the image memory every 1 / 100 to 1 / 10 of a second while the support surface (12) is continuously moved across the scanner.

Description

technical field [0001] The invention relates to the field of medical imaging. It finds particular application in time-of-flight (TOF) acquisitions in positron emission tomography (PET) scans, to which it will be described below with particular reference. The invention is also applicable to single photon emission computed tomography (SPECT) and PET and other imaging modalities. Background technique [0002] Typically, in nuclear imaging, axial slices of the subject are imaged and combined to form a 3D representation of the region of interest. This area can be located, for example the brain or heart, but is also typically used to perform full-body PET scans. Some PET scanners employ a step and shoot method of data acquisition, typically employing a data acquisition window about 10 cm wide. Data are typically acquired in a frame mode in a given bed position and transmitted so that they can only be used for reconstruction after all events for the given bed position have been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/29
CPCG01T1/2985A61B6/037G01T1/1642
Inventor G·米勒纳M·J·帕马
Owner KONINKLIJKE PHILIPS NV
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