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An X-ray detector with energy resolution and its detection method

A detection method and energy resolution technology, which is applied in the field of X-ray detectors and its detection, can solve the problems of low energy spectrum discrimination between high and low energy rays, large reconstruction results, and errors

Active Publication Date: 2020-07-14
SOUTHEAST UNIV
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Problems solved by technology

The disadvantage of this method is that the energy spectrum of the high and low energy rays obtained by the filter is not very distinguishable, so there is a large error in the reconstruction result, which is called "pseudo-dual-energy" imaging

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  • An X-ray detector with energy resolution and its detection method
  • An X-ray detector with energy resolution and its detection method
  • An X-ray detector with energy resolution and its detection method

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Embodiment Construction

[0052] The present invention will be further explained below in conjunction with the drawings.

[0053] The detector of the present invention uses an X-ray tube as the emission source, and emits broad-spectrum multicolor X-ray photons under the working condition of a fixed anode voltage. Such as figure 1 , The present invention uses MAPbX 3 The perovskite single crystal serves as the active material layer 1 for X-ray photon absorption of the detector. At MAPbX 3 In the perovskite material, X is Br, Cl or I. Thanks to MAPbX 3 Perovskite materials contain heavy elements such as Pb, Br, Cl, and I, so they can efficiently absorb X-ray photon energy and convert it directly into electron-hole pairs. In addition, MAPbX 3 Perovskite active materials have good carrier transport characteristics, such as carrier mobility, carrier lifetime and diffusion length, etc., so the photogenerated carriers generated after absorbing X-ray photons can be efficiently received, thereby Obtain higher d...

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Abstract

The present invention proposes an X-ray detector with energy resolution and its detection method. The detector includes from top to bottom: a front collecting electrode, a N + Doped layer, MAPbX for photoelectric conversion 3 Perovskite single crystal active material layer, P+ doped layer, rear collector electrode; MAPbX 3 The thickness of the perovskite single crystal active material layer is not less than 5mm; the front collecting electrode is connected to the positive electrode of the detector power supply; the rear collecting electrode is connected to the negative electrode of the detector power supply. In the detection method, different reverse bias voltages are applied to the detector in one X-ray exposure, and the detection signal currents of X-ray photons with different energies are extracted based on corresponding algorithms according to the detection currents under different bias voltages. The present invention (1) can realize X-ray detection with energy resolution capability and image subtraction of X-ray photon imaging with different energies; (2) only one X-ray exposure is required, which reduces the X-ray dose received by patients; ( 3) No additional contrast agent is needed, which reduces the toxic and side effects of patients.

Description

Technical field [0001] The invention relates to an X-ray detector and a detection method thereof, in particular to an X-ray detector with energy resolution and a detection method thereof. [0002] technical background [0003] X-ray images have important applications in the fields of medical diagnosis, industrial flaw detection, and homeland security. [0004] On the one hand, conventional X-ray digital detection has two types: indirect detection and direct detection. In indirect X-ray detection, X-ray photons are first incident on a scintillator made of inorganic materials. The scintillator converts the energy of the X-ray photons into visible light photons, and then uses a silicon-based CCD or CMOS image sensor to receive the visible photon signal Perform imaging. In this working mode, the electrical signal obtained by the detector cannot directly distinguish the energy of X-ray photons. Direct X-ray detection does not require scintillators. X-ray photons are directly incident o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L27/30H01L51/42H01L51/46G01T1/36
CPCG01T1/367H10K39/36H10K39/32H10K85/00H10K30/40Y02E10/549
Inventor 雷威王昕张晓兵李青王保平
Owner SOUTHEAST UNIV
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