What Is Digital Radiography and how does it work?

 

Digital Radiography Market
Digital Radiography Market

Digital radiography (DR) is a type of x-ray inspection that generates a digital radiographic image on a computer in real time. During object examination, x-ray sensitive plates capture data, which is then instantaneously sent to a computer without the requirement of an intermediate cassette.

Digital radiography (DR) is a type of x-ray inspection that generates a digital radiographic image on a computer in real time. During object examination, x-ray sensitive plates capture data, which is then instantaneously sent to a computer without the requirement of an intermediate cassette. A detector sensor converts the incident x-ray radiation into an equivalent electric charge, which is then transformed into a digital image.

According to Coherent Market Insights the global digital radiography market size was valued at US$ 5,290.0 million in 2019, and is expected to exhibit a CAGR of 4.2 % over the forecast period (2020–2027).

Flat panel detectors, commonly known as digital detector arrays (DDAs), deliver high-quality digital images as compared to conventional imaging equipment. They can have a higher signal-to-noise ratio and a wider dynamic range, resulting in increased sensitivity for radiography applications.

Indirect conversion and direct conversion are the two methods used by flat panel detectors. Indirect conversion flat panel detectors use a scintillator layer to convert x-ray photons to visible light photons, which are then converted into an electrical charge by an amorphous silicon photo diode matrix. The quantity and energy of x-ray photons interacting with the detector pixel, and thus the amount and density of material that has absorbed the x-rays, are proportional to this charge.

Amorphous selenium (a-Se) or Cadmium telluride (Cd-Te) photo conductors on a multi-micro electrode plate provide the highest sharpness and resolution in direct conversion flat panel detectors. Thin film transistors read the data from both types of detectors.

When x-ray photons collide with a photo conductor, such as amorphous Selenium, they are directly converted to electrical signals that are amplified and digitised in the direct conversion process. Because there is no scintillator, there is no lateral spread of light photons, resulting in a crisper image. This is what sets it apart from indirect construction.

 

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