Image sensor, controlling method of the same, x-ray detector and x-ray CT apparatus

Abstract

The present invention provides always stably sampling a high quality image irrespective of the displacement of a subject, with a simpler arrangement. The image sensor in accordance with the present invention includes a plurality of photodiodes arranged in a two-dimensional array and a plurality of read out gate circuits for reading out the photoelectric conversion charge accumulated in the photoreceptor of each of the photodiodes, in which first and second gate electrodes are provided in the opposing side of an insulator layer for forming respectively first and second potential wells in the vicinity of each of the photoreceptor, charge stored in each photoreceptor for a predetermined period of time is sequentially transferred to the first and second potential wells each at once, a potential barrier is formed for blocking the movement of charge between the photoreceptor and the second potential well by disappearing the first potential well, and charge accumulated in the second potential well is read out in a time division basis.

Description

technical field [0001] The present invention relates to an image sensor and its control method, an X-ray detector and an X-ray CT device, and in particular to an image sensor comprising a plurality of two-dimensionally arranged photodiodes and a plurality of readout grid circuits, the readout grid A circuit reads out photoelectrically converted charges stored in a photosensitive element of a photodiode, and a control method related to it, an X-ray detector and an X-ray CT apparatus. Background technique [0002] In an X-ray CT apparatus, generally, X-rays emitted through a subject are converted into light at a scintillation layer, and light signals thus obtained are further converted into electrical signals in a photodiode array (image sensor). An example will be described below. Fig. 11 and Fig. 12 are schematic diagrams of prior art (1) and (2), and Fig. 11 describes a partial plan view of a multi-layer X-ray detector in the prior art. In the figure, the arrow X represen...

AI Technical Summary

Problems solved by technology

However, in that case, since the charge storage time T of other columns cannot exactly match the switching timing of the X-ray focus, the focus of the X-ray will move during the period of the charge storage time T, resulting in a data position vague question

When trying to extract some finer data by changing the focal point of the X-ray, this only results in projection data with insufficient spatial resolution, not images with sufficient finer spatial resolution

Images