YY/T 1766.1-2021Image quality evaluation methods for computed tomography system - Part 1: Modulation transfer function evaluation (English PDF)

Foreword

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

---Part 1: Modulation transfer function evaluation;

---Part 2: Evaluation of low-contrast resolution. This part is part 1 of YY/T 1766.

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

Introduction

Spatial resolution, also known as high contrast resolution, is an important indicator of the image performance of CT scanning devices.

Historically, the test of this indicator was mainly through the subjective test method of visually inspecting high-contrast line pairs or small holes. Subjective assessment methods are limited by The observation ability of the human eye cannot accurately describe CT performance. Therefore, the MTF-frequency domain curve objective evaluation program is used by major manufacturers to make progress. Perform CT evaluation.

The test method of the existing standard (such as YY/T 0310) spatial resolution test item is described as. Use the MTF method to measure the spatial resolution However, there is no detailed and accurate description of the MTF test method at present. Allows different manufacturers in the industry to evaluate spatial resolution test items There are differences in current practices, and the spatial resolution test results obtained by various manufacturers are less comparable.

Based on the above status, this section gives the test methods and evaluations of the spatial resolution of the CT scanning device, using the modulation transfer function. The price standard is proposed for the purpose.

The implementation of this method standard will surely make the evaluation of spatial resolution in the CT industry unified and standardized.

1 Scope

This part of YY/T 1766 is applicable to whole body and special X-ray computed tomography equipment (hereinafter referred to as CT scanning device).

This section specifies the modulation transfer function (MTF) evaluation method of the spatial resolution of X-ray CT scanning devices.

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.