RADIATION DETECTOR AND RADIOGRAPHIC APPARATUS
First Claim
1. A radiation detector for detecting radiation, comprising:
- a conversion layer for converting incident radiation into electric charges;
a bias supply for applying a bias voltage to the conversion layer;
storage capacitors arranged in two dimensions for storing the electric charges converted by the conversion layer;
switching elements arranged in two dimensions for reading the electric charges stored in the storage capacitors;
a gate drive circuit for selectively driving the switching elements on one of a basis of one row at a time and a basis of a plurality of rows at a time; and
a controller for varying the bias voltage applied from the bias supply to the conversion layer according to a case of carrying out binning in which the gate drive circuit drives the switching elements on the basis of the plurality of rows at a time, and a case without the binning in which the gate drive circuit drives the switching elements on the basis of one row at a time.
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Accused Products
Abstract
A drive controller varies a bias voltage applied from a bias supply to a conversion layer based on the presence or absence of binning, that is, for a case of carrying out binning where switching elements are driven on the basis of a plurality of rows at a time by a gate drive circuit, and for a case of carrying out no binning where the switching elements are driven on a row-by-row basis by the gate drive circuit. Therefore, in the case of a fluoroscopic mode for acquiring images with binning, a lowering of a dynamic range can be suppressed. In the case of a radiographic mode with no binning, spatial resolution can be made high. That is, a high dynamic range and high spatial resolution can be optimized according to modes of operation.
17 Citations
7 Claims
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1. A radiation detector for detecting radiation, comprising:
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a conversion layer for converting incident radiation into electric charges; a bias supply for applying a bias voltage to the conversion layer; storage capacitors arranged in two dimensions for storing the electric charges converted by the conversion layer; switching elements arranged in two dimensions for reading the electric charges stored in the storage capacitors; a gate drive circuit for selectively driving the switching elements on one of a basis of one row at a time and a basis of a plurality of rows at a time; and a controller for varying the bias voltage applied from the bias supply to the conversion layer according to a case of carrying out binning in which the gate drive circuit drives the switching elements on the basis of the plurality of rows at a time, and a case without the binning in which the gate drive circuit drives the switching elements on the basis of one row at a time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A radiographic apparatus for acquiring still images and dynamic images, comprising:
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a radiation emitter for emitting radiation; and a radiation detector for detecting radiation transmitted through a subject; wherein the radiation detector includes; a conversion layer for converting incident radiation into electric charges; a bias supply for applying a bias voltage to the conversion layer; storage capacitors arranged in two dimensions for storing the electric charges converted by the conversion layer; switching elements arranged in two dimensions for reading the electric charges stored in the storage capacitors; a gate drive circuit for selectively driving the switching elements on one of a basis of one row at a time and a basis of a plurality of rows at a time; and a controller for varying the bias voltage applied from the bias supply to the conversion layer according to a case of carrying out binning in which the gate drive circuit drives the switching elements on the basis of the plurality of rows at a time, and a case without the binning in which the gate drive circuit drives the switching elements on the basis of one row at a time.
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Specification