A mobile radiation generator includes an arm part on which an irradiation section is mounted. The height of the irradiation section is changed in a case in which the arm part is rotated. A spring generates negative rotational moment in a negative direction where the irradiation section is displaced upward against positive rotational moment that acts on the arm part in a positive direction due to own weight of the irradiation section and the like. A friction mechanism is built in a pillar. In a case in which the magnitude of the positive rotational moment and the magnitude of the negative rotational moment are different from each other, the friction mechanism generates a frictional force acting in a direction opposite to a direction where the arm part is to be rotated due to a difference between the positive rotational moment and the negative rotational moment and cancelling the difference.

A positron emission tomography (PET)-scanning device is provided having a detector ring for detecting emitted PET-radiation and a main supporting structure to which is attached a U-shaped portion with two arms for holding the detector ring between the arms (341). The detector ring is held by the two arms in such a way that the detector ring can be rotated about an axis of rotation that extends through the U-shaped portion, in particular through the two arms of the U-shaped portion. The main supporting structure has a guide rail to which the U-shaped portion is attached in such a way, that the U-shaped portion can be displaced along the guide rail, wherein the guide rail extends along an inclined direction relative to the direction of gravity.

According to one embodiment, an X-ray CT apparatus includes a rotating body configured to house an X-ray tube which irradiates X-rays on an object; at least one weight configured to be housed in the rotating body and to adjust balance of the rotating body; a sensor configured to detect fluctuation amount in a front-back direction approximately orthogonal to a rotating surface of the rotating body; processing circuitry configured to determine moving amount of the weight based on the fluctuation amount in a front-back direction detected by the sensor; and at least one weight moving mechanism configured to be housed in the rotating body and to move a position of the weight based on the moving amount determined by the determination unit.

An X-ray detector has a first detector module, a second detector module and manipulation means. The first detector module includes a first detection region arranged in a first detection plane, the second detector module includes a second detection region arranged in a second detection plane, which is adjacent to the first detection region. The manipulation means is configured to orient the first detection plane of the first detector module and the second detection plane of the second detector module to each other such that a first normal to surface of the first detection plane and a second normal to surface of the second detection plane intersect within a reference region.

The present disclosure provides a gantry for an X-ray system. The gantry may include a base section, a lifting section, and a swing section. The base section may be configured to move. A first end of the lifting section may be connected to the base section. A first end of the swing section may be rotatably connected to a second end of the lifting section. A radiation assembly may be disposed on a second end of the swing section.

A CT scanner apparatus includes an X-ray source mounted on a gantry of the CT scanner apparatus and configured to emit X-rays, and at least one magnetic field gradient circuit. The at least one magnetic field gradient circuit and the X-ray source rotate together. The CT scanner apparatus also includes a CT detector mounted on the gantry in fixed orbital opposition to the X-ray source. The CT detector is configured to detect the X-rays, wherein the CT detector and the X-ray source are configured to rotate along a first orbital path. The CT scanner apparatus also includes an array of fixed PCD assemblies arranged in a ring inside the first orbital path. Each PCD assembly is configured to rotatably actuate about a gantry support from a first position to a second position to reduce blockage of emitted X-rays when the magnetic field gradient circuit rotates within a predetermined distance of the PCD assembly.

When an X-ray detector is removed from a storage part, a sensor senses this, and transmits to an up and down control part a signal indicating that the X-ray detector has been taken out of the storage part. Upon receipt of the signal, the up and down control part releases braking force by electro permanent magnets. In doing so, sticking force of the electro permanent magnet on a fixing part, and sticking force of the electro permanent magnet on a stopper plate are released. The weight of a counter weight is larger than the total value of the weights of the arm, X-ray tube, collimator, and the like, and therefore in a state where the arm is released from being fixed by the electro permanent magnets, the arm starts to move up together with the X-ray tube and the collimator.

Provided is a C-arm X-ray apparatus, which includes a C-arm translation assembly, a support column, a base, a counterweight, and an adjustment device, wherein one end of the support column is connected to the base, and the other end of the support column is slidably connected to the C-arm translation assembly; the counterweight is slidably connected to the base; and the adjustment device is connected to the counterweight, and configured to drive the counterweight to move by a preset distance in a direction opposite to a first direction in the case that the C-arm translation assembly moves in the first direction, such that a gravity center of the C-arm X-ray apparatus remains at a preset position.

Exemplary X-ray imaging systems (e.g., volume radiographic imaging systems, CBCT systems) and/or methods for using the same can provide a detector and a counterweight separately (e.g., scanner or gantry) even though the counterweight and the detector can be positioned in or traverse the same relative space.

A nuclear medicine tomography system comprising: a detector carrier having a circular or partially circular aperture and defining a plane; a plurality of SPECT detector assemblies attached to the detector carrier and arranged around the aperture; a patient carrier movable relative to the plane; each detector assembly comprising an arm defining an extension axis and at least one detector head movable along the axis, wherein each detector assembly has a rounded distal portion; wherein each detector head is extendible along the axis, from the detector carrier toward the patient carrier; and a controller to: control, based on desired bore size and shape, extension and retraction of the detector heads to a spatial arrangement defined by the extension and retraction, control data acquisition by the detector heads, and control image reconstruction of acquired data; the controller further configured to control data acquisition and/or image reconstruction, based on the spatial arrangement.