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Data acquisition

A detector and scintillator array technology, applied in the field of computed tomography, can solve the problems of low signal rotation times and limited imaging performance

Active Publication Date: 2012-04-11
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Unfortunately, as detection techniques continue to evolve to more slices, smaller slice widths, lower signal, and faster rotation times, noise and / or spatial resolution constraints limit imaging performance

Method used

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Embodiment Construction

[0020] figure 1 An imaging system 100 such as a computed tomography (CT) scanner is shown. Imaging system 100 includes a generally stationary gantry 102 and a rotating gantry 104 . The rotating gantry 104 is rotatably supported by the stationary gantry 102 and rotates about an examination region 106 about a longitudinal or z-axis. A radiation source 108 , such as an x-ray tube, is supported by the rotating gantry 104 and emits radiation across the examination region 106 .

[0021] The radiation sensitive detector array 112 subtends the rounded arc opposite the radiation source 108 throughout the extent of the examination region 106 and detects radiation traversing the examination region 106 . In the illustrated embodiment, radiation sensitive detector array 112 includes a plurality of detector modules 114 disposed relative to each other along a direction transverse to the z-axis. The detector module 114 includes a plurality of detector mosaics or tiles 116 disposed relative...

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Abstract

An imaging detector includes a scintillator array (202), a photosensor array (204) optically coupled to the scintillator array (202), a current-to-frequency (I / F) converter (314), and logic (312). The I / F converter (314) includes an integrator (302) and a comparator (310), and converts, during a current integration period, charge output by the photosensor array (204) into a digital signal having a frequency indicative of the charge. The logic (312) sets a gain of the integrator (302) for a next integration period based on the digital signal for the current integration period.; In one instance, the gain is increased for the next integration period, relative to the gain for the current integration period, which allows for reducing an amount of bias current injected at an input of the I / F converter (314) to generate a measureable signal in the absence of radiation, which may reduce noise such as shot noise, flicker noise, and / or other noise.

Description

technical field [0001] The following generally relates to data acquisition, and has particular application to computed tomography (CT). However, it can also be applied to other medical imaging applications and non-medical imaging applications. Background technique [0002] Computed tomography (CT) scanners include an x-ray tube mounted on a rotatable gantry that rotates about an examination region about a longitudinal or z-axis. The detector array subtends a fillet arc from the x-ray tube opposite the examination region. A detector array detects radiation traversing the examination region and receptors or objects therein and generates signals indicative thereof. A reconstructor reconstructs the signal and generates volumetric image data. The volumetric image data can be processed to generate one or more images. [0003] The detector array typically includes a scintillator array optically coupled to a photosensor array electrically coupled to processing electronics. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/20
CPCG01T1/2018G01T1/2006A61B6/03A61B6/405A61B6/4233A61B6/585G01T1/20182
Inventor M·A·查波R·P·卢赫塔
Owner KONINKLIJKE PHILIPS ELECTRONICS NV