Radiation detector and X-ray CT apparatus

1. A radiation detector comprising:

a detector block including a plurality of radiation detector modules arranged in a slice direction;

a plurality of cables configured to receive signals from the radiation detector modules of the detector block;

a plurality of connectors associated with the cables, respectively, and spaced, one from another, in the slice direction;

circuit substrates configured to receive signals via the connectors from the radiation detector modules of the detector block;

a storage unit that holds the detector block and the circuit substrates; and

a guide unit that supports the circuit substrates, allowing the circuit substrates to be pulled out from, and inserted into, the storage unit, in the slice direction, and to be moved toward and away from the detector block.

2. The radiation detector according to claim 1 , wherein

the detector block includes first radiation detector modules arranged in the slice direction and second radiation detector modules arranged in the slice direction, and

the connectors are connected to the first radiation detector modules and the second radiation detector modules.

3. The radiation detector according to claim 1 , wherein

the circuit substrates have an amplifier circuit each, the amplifier circuits being configured to amplify electric signals from the detector modules adjacent in the slice direction.

4. The radiation detector according to claim 1 , wherein

the guide unit includes sliders integrally secured to the circuit substrates respectively, and the circuit substrates are moved toward the detector modules and are connected to any one of the connectors, when the sliders are moved in the slice direction.

5. The radiation detector according to claim 4 , wherein an operation lever is attached to the sliders.

6. The radiation detector according to claim 4 , wherein

the guide unit has holding substrates secured to the circuit substrates,

each holding substrate has a guide slit inclining to the slice direction and serving to convert the motion of the circuit substrate to motion of a direction intersecting at right angles with the slice direction, and

each slider has pin members loosely fit in the guide slit.

7. The radiation detector according to claim 4 , wherein

the storage unit contains a stopper that prevents the sliders from being further inserted once the sliders have been inserted into the radiation detector in the slice direction for a predetermined distance.

8. The radiation detector according to claim 7 , wherein

the stopper comprises guide pins that extend in a direction intersecting at right angles with the slice direction.

9. A radiation detector comprising:

a detector block including a plurality of radiation detector modules arranged in a slice direction;

a plurality of cables configured to receive signals from the radiation detector modules of the detector block;

a plurality of connectors associated with the cables, respectively, and spaced, one from another, in the slice direction; and

circuit substrates configured to receive signals via the connectors from the radiation detector modules of the detector block,

wherein any one of the connectors is provided at that end of one circuit substrate which is distal as viewed in the direction of inserting the circuit substrate, and is moved toward and away from the detector block to be attached to, and detached from, the detector block.

10. An X-ray CT apparatus comprising:

an X-ray tube configured to apply an X-ray beam to an object; and

a radiation detector opposed to the X-ray tube, shaped like a circular arc and configured to detect X-rays passed through the object and convert the X rays into an electric signal, wherein

the radiation detector includes:

a detector block including a plurality of radiation detector modules arranged in a slice direction;

a plurality of cables to receive signals from the radiation detector modules of the detector block;

a plurality of connectors associated with the cables, respectively, and spaced, one from another, in the slice direction;

circuit substrates configured to receive signals via the connectors from the radiation detector modules of the detector block;

a storage unit that holds the detector block and the circuit substrates; and

a guide unit that supports the circuit substrates, allowing the circuit substrates to be pulled out from, and inserted into, the storage unit, in the slice direction, and to be moved toward and away from the detector block.

11. An X-ray CT apparatus comprising:

an X-ray tube configured to apply an X-ray beam to an object;

a detector block having a plurality of radiation-detecting element arrays and configured to detect X-rays passed through the object;

circuit substrates configured to process electric signals from the detector block;

first connectors configured to electrically connect the circuit substrates to the detector block;

second connectors spaced apart from the first connectors and configured to electrically connect the circuit substrates to the detector block;

a storage unit that holds the detector block and the circuit substrates; and

a guide unit that supports the circuit substrates, allowing the circuit substrates to be pulled out from, and inserted into, the storage unit, in the slice direction, the guide unit configured to couple and decouple connectors provided at the detector block and constituting the first connectors to and from the connectors provided at the circuit substrates.

12. An X-ray CT apparatus comprising:

an X-ray tube configured to apply an X-ray beam to an object;

first detector modules, each including a plurality of radiation-detecting element arrays, and configured to detect X-rays passed through the object;

second detector modules, each including a plurality of radiation-detecting element arrays, and arranged beside the first detector modules with respect to a slice direction;

circuit substrates configured to process electric signals from the first detector modules and second detector modules;

first connectors configured to electrically connect the first detector modules to the circuit substrates; and

second connectors configured to electrically connect the second detector modules to the circuit substrates,

wherein the first connectors are pulled and inserted in one direction, and the second connectors are pulled and inserted in another direction.