GB/T 23909.1-2009Non-destructive testing -- Radioscopic testing -- Part 1: Quantitative measurement of imaging properties (English PDF)

GB/T 23909.1-2009 is the English-translated version of 无损检测 射线透视检测 第1部分：成像性能的定量测量.

GB/T 23909.1-2009 — GB /procedures specified in this T 23909 can be applied to provide an electronic signal display unit, or by automatic image analysis system There ray fluoroscopy system.

In response to recognized measurement samples for analysis of the ray fluoroscopy system. Measurements should be installed in Preparation of the laboratory were perfect.

You can obtain the imaging performance of the imaging system from the measurements. This section does not include imaging performance under dynamic. 2-ray fluoroscopy system Ray fluoroscopy system includes a radiation source, a processing system, the collimator, filter plate and the imaging device.

The image forming apparatus includes an X-ray or gamma converting means, the attenuated radiation is converted into a digital output signal S of the optical display or (See Figure 1).

The image processor may be part of the image forming apparatus. In the case of a visual assessment, which includes a display unit. In automatic Image evaluation system, the display unit is not part of the system.

1 ----ray source; 2 --- workpiece; 3 --- ray conversion means; 4 --- output signal; 5 --- image processor; 6 --- display unit. A typical arrangement ray fluoroscopy system of FIG.

1 to specify the imaging performance of the imaging device, the use of terms and parameters and information theory perspective ray detection. Table 1 parameter definition the image quality of the image forming apparatus.

Table 1 image quality parameter Image quality parameter definition describes the main points Inherent unclear Degree Ui and excessive exposure <=10% and from the intensity inherent unsharpness Edge spread function staircase function Small details distinguish objects limit Spatial modulation Transfer Function MTF + infinity-infinity LSF (x0) d x0 + infinity-infinity LSF (x0) = dESF (X) d x0 Differential space edge spread function After the ESF, Fourier transform the amplitude spectrum LSF. line spread function Object size contrast transfer function; Image sharpness function description

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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