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CT performance detecting phantom for automatic tube current modulation mode and test method of phantom

A technology of current modulation and mode detection, applied in the field of CT medical imaging, can solve the problems that cannot be used to evaluate the quality of scanning CT images

Pending Publication Date: 2019-08-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a CT performance detection phantom for automatic tube current modulation mode and its testing method, so as to solve the problem that the current image quality detection phantom cannot be used to evaluate the quality of scanning CT images in automatic tube current modulation mode

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  • CT performance detecting phantom for automatic tube current modulation mode and test method of phantom

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Experimental program
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Effect test

Embodiment 1

[0025] refer to Figure 1-2 , a new type of CT performance detection phantom for automatic tube current modulation mode, the main phantom material is polymethyl methacrylate.

[0026] The length of the phantom is 15cm,

[0027] Which includes: CT value detection module, high contrast resolution detection module, low contrast resolution detection module and field uniformity and noise detection module; wherein, the CT value detection module and high contrast resolution detection module are based on the The polymethyl methacrylate material is the background; the field uniformity and noise detection module is made of the polymethyl methacrylate material; wherein:

[0028] The CT value detection module contains more than 4 through holes with a length of 15cm, and the diameter of these through holes is 1.5cm; Cylinder measurement materials, these measurement materials are used to measure the CT value of different materials at all levels in the tube current modulation mode and comp...

Embodiment 2

[0041] refer to Figure 1-2 , a CT performance detection phantom for automatic tube current modulation mode, the main phantom material is polymethyl methacrylate. Structure is with embodiment 1.

[0042] In the CT performance detection phantom, high-density metal tungsten wires are arranged in the polymethyl methacrylate material along the z-axis direction for measuring high contrast resolution.

[0043] The test method for the CT performance detection phantom of automatic tube current modulation mode comprises the following steps:

[0044] Step 1: Make the axis of the phantom perpendicular to the scanning plane, place it in the center of the scanning field and fix it, and scan the phantom using commonly used clinical scanning conditions;

[0045] Step 2: Use the software to draw the ROI of the region of interest in the geometric center of the phantom. The region must include a complete wire section, and obtain the HU value in the region. After deducting the background HU va...

Embodiment 3

[0050] refer to Figure 1-2 , a new type of CT performance detection phantom for automatic tube current modulation mode, the main phantom material is polymethyl methacrylate. Structure is with embodiment 1.

[0051] The test method for the CT performance detection phantom of automatic tube current modulation mode comprises the following steps:

[0052] Step 1: Make the axis of the phantom perpendicular to the scanning plane, place it in the center of the scanning field and fix it, and scan the phantom using commonly used clinical scanning conditions;

[0053] Step 2: Use the software to find the ROI of the region of interest near the center of the phantom and the edge of the long and short axes to obtain the HU value;

[0054] Step 3: Calculate various texture parameters including energy, entropy value, moment of inertia, inverse moment, etc. for the ROI area in the directions of 0°, 45°, 90°, and 135°;

[0055] energy:

[0056] Moment of inertia: N g =|i-j|;

[0057...

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Abstract

The present invention belongs to the technical field of CT medical imaging and specifically discloses a CT performance detecting phantom for a CT automatic tube current modulation mode and a test method of the phantom. The CT performance detecting phantom has a main material of polymethyl methacrylate, comprises a CT value detecting module, a high contrast resolution detecting module, a low contrast resolution detecting module, and a field uniformity and noise detecting module, and can be used to measure uniformity and noise at all levels in the tube current modulation mode. The CT performancedetecting phantom solves a problem that current image quality detecting phantoms are not suitable for scanning CT images in the automatic tube current modulation mode, can automatically analyze imagequality evaluation parameters (CT value linearity, noise, uniformity, high contrast resolution, low contrast resolution, texture features, etc.) generated by an automatic tube current modulation scanning sequence, and achieves image quality performance evaluation of a CT new technology-automatic tube current modulation technology.

Description

technical field [0001] The invention belongs to the technical field of CT medical imaging, and in particular relates to a CT performance detection phantom used in a CT automatic tube current modulation mode and a testing method thereof. Background technique [0002] Computed Tomography (CT) originated in the late 1960s and began to be used clinically in 1972. The powerful diagnostic capabilities of CT and its innovative breakthroughs in medical imaging make it considered one of the milestones in the development of clinical images in the last century. Nowadays, X-ray computed tomography imaging has become one of the most important auxiliary means of medical diagnosis. In order to ensure that CT equipment provides high-quality images to meet the needs of clinical diagnosis, CT equipment must be tested regularly. The performance criteria for evaluating the image quality of a CT device mainly include: high contrast resolution noise, density resolution, CT value, linearity and u...

Claims

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Application Information

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IPC IPC(8): A61B6/00
CPCA61B6/583A61B6/58
Inventor 杨扬刘海宽卓维海
Owner FUDAN UNIV
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