YY/T 1766.2-2021Image quality evaluation methods for computed tomography system - Part 2: Low contrast resolution evaluation (English PDF)

Foreword

YY/T 1766 "X-ray computed tomography equipment image quality evaluation method" is divided into the following two parts.

---Part 1: Modulation transfer function evaluation;

---Part 2: Evaluation of low-contrast resolution. This part is part 2 of YY/T 1766.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.

Introduction

The low-contrast resolution of CT is an important indicator of the image performance of CT scanning devices, and it also reflects the image quality and dose of CT scanning devices. Horizontal relationship.

At present, the absolute evaluation of the low-contrast resolution of CT scanning devices is mainly done through visual evaluation.

The influence of many factors. Due to the significant difference in low-contrast resolution at different doses, the expression of low-contrast resolution evaluation results is also A standardized and standardized form is needed.

On the other hand, with reduced dose CT image reconstruction technology (such as iterative reconstruction technology, etc.), more and more CT products are applied How to effectively evaluate the comparability of low-contrast resolution while reducing the dose is also an important aspect of image quality evaluation.

The method based on manual (expert) visual evaluation is often time-consuming and does not have broad application significance. Based on the objective comparative evaluation of the model observer Based on the research foundation in recent years, the price has also been gradually introduced into CT image quality evaluation.

Based on the above status, this standard provides the low-contrast resolution for CT scanning devices and the use of reduced-dose image reconstruction technology Afterwards, the achievable dose reduction level is given a standardized evaluation method.

The implementation of this method standard will surely unify and standardize the evaluation of low-contrast resolution in the CT industry.

1 Scope

This part of YY/T 1766 specifies the evaluation method of low-contrast resolution of CT scanning device images.

This part is applicable to whole body and special X-ray computed tomography equipment (hereinafter referred to as CT scanning device), including radiotherapy CT scanning devices that plan to provide image data, but do not include oral CT scanning devices or angiography and mobile imaging with three-dimensional imaging capabilities. Moving C-arm equipment.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 10149-1988 Medical X-ray equipment terms and symbols

3 Terms and definitions

The following terms and definitions defined in GB/T 10149-1988 apply to this document.