Images of the same X-ray flat panel detector at different spatial resolutions
For the same type of X-ray flat panel detector, the DQE is variable at different spatial resolutions; the extreme high DQE does not mean that the DQE is high at any spatial resolution. The calculation formula of DQE is as follows: DQE=S2×MFT2/NSP×X×C
S: average signal intensity; MTF: modulation transfer function; X: X-ray exposure intensity; NPS: system noise power spectrum; C: X-ray quantum coefficient. From the calculation formula, we can see that the corresponding X-rays in different MTF values Flat panel detectors have different DQEs, which means that they have different DQEs at different spatial resolutions.
Influence of X-ray flat panel detector modulation transfer function on image quality
Modulation transfer function (MTF) describes the ability of the system to reproduce the spatial frequency range of the imaged object. The ideal imaging system requires 100% reproduction of the details of the imaged object, but there must be varying degrees of attenuation in reality, so MTF is always <1, which means that the X-ray flat panel detector imaging system cannot reproduce all the input images, in other words, All images obtained by the X-ray flat panel detector imaging system lose the contrast of the image to varying degrees. The larger the MTF value, the stronger the ability of the imaging system to reproduce the details of the imaged object. The MTF of the system must be measured. To evaluate the inherent imaging quality of the digital radiography system, it is necessary to calculate the inherent pre-sampling MTF of the system without subjective influence.
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S: average signal intensity; MTF: modulation transfer function; X: X-ray exposure intensity; NPS: system noise power spectrum; C: X-ray quantum coefficient. From the calculation formula, we can see that the corresponding X-rays in different MTF values Flat panel detectors have different DQEs, which means that they have different DQEs at different spatial resolutions.
Influence of X-ray flat panel detector modulation transfer function on image quality
Modulation transfer function (MTF) describes the ability of the system to reproduce the spatial frequency range of the imaged object. The ideal imaging system requires 100% reproduction of the details of the imaged object, but there must be varying degrees of attenuation in reality, so MTF is always <1, which means that the X-ray flat panel detector imaging system cannot reproduce all the input images, in other words, All images obtained by the X-ray flat panel detector imaging system lose the contrast of the image to varying degrees. The larger the MTF value, the stronger the ability of the imaging system to reproduce the details of the imaged object. The MTF of the system must be measured. To evaluate the inherent imaging quality of the digital radiography system, it is necessary to calculate the inherent pre-sampling MTF of the system without subjective influence.
Our company specializes in the production of various vertical and mobile chest film racks, various types of X-ray machine parts and X-ray DR flat panel detectors. Welcome to call and negotiate!
Author：肖恩
