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Method for determining radiation attenuation in positron emission tomography

A technology of positron emission and tomography, which is applied in the direction of radiodiagnostic instruments, computerized tomography scanners, and radiation measurement, and can solve problems such as difficult derivation, inaccuracy, and manufacturing tolerances

Inactive Publication Date: 2011-12-28
SIEMENS AG
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, other components such as metallic components can only be modeled generally, from which the actual local structure of the linear attenuation coefficient can only be deduced imprecisely and with difficulty
Also, each coil may have slightly different attenuation imaging due to manufacturing tolerances

Method used

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  • Method for determining radiation attenuation in positron emission tomography
  • Method for determining radiation attenuation in positron emission tomography
  • Method for determining radiation attenuation in positron emission tomography

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Embodiment Construction

[0025] figure 1 Shown is an MR-PET hybrid device 1 comprising a combined magnetic resonance-positron emission tomography apparatus 2 (MR-PET tomography apparatus), an examination apparatus arranged in the MR-PET tomography apparatus A couch 3 , a control unit 4 and an image computing unit 5 . The control unit 4 is configured to control the MR-PET hybrid tomography apparatus 2 and the examination couch 3 arranged in the MR-PET hybrid tomography apparatus 2, so as to acquire positive images of the examination object or patient arranged on the examination couch 3. Electron emission tomography pictures and magnetic resonance pictures are displayed on the display screen of the image calculation unit 5 by means of the image calculation unit 5 . The mode of operation of the tomograph 2 , the control unit 4 and the image calculation unit 5 is generally known to those skilled in the art and will therefore not be explained in more detail here.

[0026] The image quality of positron em...

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Abstract

A method is disclosed for determining radiation attenuation as a result of an object in a positron emission tomography scanner. In at least one embodiment, a phantom object is arranged in the positron emission tomography scanner during the method. First raw radiation data of the phantom object is acquired while the object is not arranged in the positron emission tomography scanner. A first image of the phantom object is calculated from the first raw radiation data. The object then is arranged in the positron emission tomography scanner (2) and preliminary radiation attenuation of the object is identified. Second raw radiation data of the phantom object is acquired while the object is arranged in the positron emission tomography scanner. A second image of the phantom object is calculated from the second raw radiation data taking into account the preliminary radiation attenuation. The radiation attenuation is determined on the basis of the first image and the second image.

Description

technical field [0001] The invention relates to a method for determining radiation attenuation caused by objects in a positron emission tomography apparatus, and to a positron emission tomography-based positron emission tomography apparatus for a positron emission tomography apparatus A device for determining the attenuation of radiation by an object in the meter. Background technique [0002] To determine the attenuation correction in a positron emission tomography (PET), a combination of a magnetic resonance system and a positron emission tomography system, a so-called MR-PET hybrid system, can be used. However, a problem with the use of such MR-PET hybrid devices is the fact that the local coils used to receive magnetic resonance signals of an examination object, such as a human body, are not visible in conventional clinical magnetic resonance scanning techniques. But these coils have a significant influence on the emission data of positron emission tomography, so their ...

Claims

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Application Information

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IPC IPC(8): A61B6/03A61B5/055G01R35/00G01R33/44G01T1/161
CPCA61B6/4417A61B6/583A61B6/037G06T11/005G01R33/481
Inventor 马塞厄斯.芬切尔拉尔夫.雷德贝克
Owner SIEMENS AG
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