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Pulsed X-ray for continuous detector correction

A detector and X-ray technology, applied in the field of diagnostic imaging, can solve the problems of large changes in time, unstable photoconductor gain and offset, and achieve the effect of preventing artifacts and reducing thickness

Inactive Publication Date: 2007-11-28
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gain and offset of photoconductors are unstable and vary considerably over time

Method used

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  • Pulsed X-ray for continuous detector correction
  • Pulsed X-ray for continuous detector correction
  • Pulsed X-ray for continuous detector correction

Examples

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Embodiment Construction

[0035] Referring to FIG. 1 , an imaging system 10 includes a computed tomography scanner 12 that houses or supports a first radiation source 14 that, in one embodiment, projects a beam of radiation onto a region defined by the scanner 12. An x-ray source or x-ray tube in area 16 is inspected. The radiation beam after passing through the examination region 16 is detected by a two-dimensional radiation detector 18 comprising a plurality of detection modules or detection elements 20 arranged to detect the radiation beam after passing through the examination region 16 . Detector 18 includes an X-ray-to-analog signal conversion layer 22 that is characterized by a gain A(t) and / or offset B(t) that generally vary with time. In one embodiment, conversion layer 22 includes an array of scintillation crystals or scintillators or scintillation layer 24 coupled to photodiode array 26 . In another embodiment, the conversion layer 22 comprises a plurality of direct conversion semiconductors...

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Abstract

A radiographic imaging apparatus (10) including a first radiation source (14) emitting a radiation beam to an examination region (16). The detector (18) converts the detected radiation passing through the examination area (16) into an electrical detector signal representative of the detected radiation. The detector (18) has at least one characteristic that changes in time, such as offset B(t) or gain A(t). The gate pulsing device (64) switches the first radiation source (14) on and off at a rate of 1000 to 5000 pulses per second, so that the offset B(t) is remeasured at least between 1000 and 5000 times per second, and Corrections are made many times during the detector signal generation process. The gain A(t) is measured using a second pulsing device (88) by pulsing a second pulsed source (86, 100, 138) of constant intensity (XRef). The gain A(t) is remeasured and corrected multiple times per second during detector signal generation.

Description

technical field [0001] This application relates to diagnostic imaging techniques. It has been found to be particularly suitable for use in computed tomography imaging and will be described with particular reference thereto. Furthermore, it also finds applicability to other imaging devices and methods using X-ray detectors. Background technique [0002] A CT scanner typically includes an x-ray source and an array of x-ray detectors each affixed to diametrically opposite sides of a gantry. During scanning of a patient located in the cavity of the gantry, the gantry rotates about the axis of rotation and the x-ray source emits x-rays during data acquisition during the scan. X-rays are collected by a detector comprising a plurality of detector elements. [0003] Typically, an X-ray detector used in a CT scanner consists of a layer of scintillation crystal connected to an array of silicon photodiodes. Scintillation crystals absorb X-rays passing through the patient and produc...

Claims

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Application Information

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IPC IPC(8): G01T1/29
CPCA61B6/585A61B6/032G01T1/24
Inventor R·P·卢塔M·A·查波B·E·哈伍德R·A·马特森C·J·弗雷托斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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