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X-ray ct data processing device and x-ray ct device comprising same

A data processing device, X-ray technology, used in image data processing, equipment for radiological diagnosis, health index calculation, etc.

Active Publication Date: 2018-06-08
HITACHI HEALTHCARE MFG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Furthermore, when the presumed reference substance is different from the actual substance, or if an inappropriate reference substance is selected, the calculated density and abundance ratio will not become accurate values, resulting in a decrease in quantification. the value of the problem

Method used

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  • X-ray ct data processing device and x-ray ct device comprising same
  • X-ray ct data processing device and x-ray ct device comprising same
  • X-ray ct data processing device and x-ray ct device comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0066] In the present embodiment, in order to determine the suitability of a plurality of reference substances used in creating a multi-energy image, the computing unit 105 calculates an energy-independent physical quantity (reference substance data) using a combination of different CT data for each reference substance. ), and an index for judging the suitability of a reference substance is calculated as a numerical value based on the similarity of a plurality of reference substance data obtained under different combinations.

[0067] exist Figure 5 An example of the configuration of the computing unit 105 that realizes the above processing is shown. Such as Figure 5 As shown, the calculation unit 105 includes a main control unit 50 , a correction processing unit 51 , a multi-energy image creation unit 53 , and a reference substance calculation unit 55 . The main control unit 50 controls the operations of the correction processing unit 51 , the multi-energy image creation ...

Embodiment approach 2

[0158] In Embodiment 1, projection data of a density image was used as reference substance data for calculating the suitability determination index 144 , but this embodiment is characterized in that data other than projection data, for example, a density image, is used as reference substance data.

[0159]For this purpose, the calculation unit 105 (reference substance data calculation unit 551) of the X-ray CT apparatus or data processing device of the present embodiment uses a plurality of projection data (data detected by the X-ray detector or corrected by the correction processing unit 51). The data collected is called CT data) to calculate the density image of each reference substance as the reference substance data. The same probability as in Embodiment 1 using projection data is calculated to create an appropriateness determination index by calculating the same probability of a plurality of density images calculated for the same reference substance.

[0160] Here, severa...

Embodiment approach 3

[0196] In Embodiments 1 and 2, indicators for judging whether the reference substance is appropriate are displayed on the display unit 106, and the photographer judges whether the reference substance is appropriate or not based on the index. Make a judgment. Specifically, the reference substance calculation unit 55 determines whether the reference substance is appropriate or not based on the value of the index.

[0197] Hereinafter, the configuration and operation of the present embodiment will be described focusing on differences from the first embodiment.

[0198] In this embodiment, the configuration of the device is also the same as figure 1 The shown X-ray CT apparatuses are the same, but the configuration of the computing unit 105 is different. exist Figure 12 A configuration example of the computing unit 105 is shown. exist Figure 12 in, with Figure 5 The same elements are denoted by the same symbols, and repeated explanations are omitted.

[0199] A reference...

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Abstract

The purpose of the present invention is, when carrying out multi-energy photography with an energy-separation detector and creating an image in which a subject is separated into a plurality of standard substances, to estimate the appropriateness of posited standard substances and determine with good precision that appropriate standard substances are present in said subject. An X-ray CT data processing device, which processes CT data which is acquired in each of a plurality of detected energy ranges and creates a reconstructed image which is separated into prescribed standard substances, comprises: a standard substance data computation unit which, using different combinations of a plurality of instances of the CT data, computes, for each of a plurality of standard substances, physical quantities which are not energy-dependent, creating a plurality of instances of standard substance data for the same standard substance; and an appropriateness determination index creation unit which, on the basis of the plurality of instances of standard substance data which the standard substance data computation unit has computed, creates an index for determining the appropriateness of the standardsubstance.

Description

technical field [0001] The present invention relates to a technology for processing data obtained by an X-ray CT apparatus, and in particular to a technology for classifying a plurality of reference substances using projection data captured by an X-ray CT apparatus equipped with an energy-discriminating X-ray detector. Wherein, the X-ray detector in the energy division mode divides the incident X-ray energy into a plurality of energy ranges for measurement. Background technique [0002] The X-ray CT apparatus calculates the X-ray absorption coefficient (ray attenuation coefficient) from the projection data of the X-ray transmission image of the subject taken from multiple directions, and obtains the reconstructed image of the tomographic image of the subject. [0003] Furthermore, in recent years, by the dual-energy imaging method, it is possible to obtain monochromatic X-ray equivalent images, reference material density images, effective atomic number images, electron densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03
CPCA61B6/032A61B6/4241A61B6/463A61B6/482A61B6/5205A61B6/5217G06T11/005G06T2211/408G16H50/30G06T11/003G06T2207/10081
Inventor 昆野康隆
Owner HITACHI HEALTHCARE MFG LTD
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