Siemens Medical Solutions Usa, Inc.

Perkinelmer Holdings, Inc.

Siemens Medical Systems, Inc.

Farhad Abbasi Ghelmansarai

Ali Reza Bani-Hashemi

Francisco Miguel Hernandez-Guerra

William F Collins

Edward Lewis Calderon

Johannes Stahl

Dieter Manthey

Francisco M Hernadez-Guerra

Certain embodiments described herein are directed to devices and systems that can be used for direct and indirect detection of radiation such as X-rays. In certain examples, the device can include a modulator optically coupled to a sensor. In some examples, the modulator can be configured to switch between different states to provide an imaging signal in one state and a dosimetry signal in another state.

Detectors and systems and methods of using them in imaging and dosimetry

A method for adaptive frame scanning for pulsed x-ray imaging comprising the steps of: scanning lines on an image detector sequentially; receiving an indication that radiation is about to begin; waiting a fixed delay after the indication is received; suspending scanning after the fixed delay has lapsed; and resuming scanning of lines on the detector upon receiving an indication that radiation has stopped. By monitoring for completion of a frame a predetermined frame delay can be added before commencing the next line scan to accommodate jitter in the radiation pulse timing.

Adaptive frame scanning scheme for pulsed X-ray imaging

Some embodiments include transmission of a pulse to imaging elements in order to read an image frame from the imaging elements, prior to exposure of the imaging elements to radiation that is to be converted to and captured as image data, wherein the pulse is transmitted so that the image frame is read and the imaging elements become ready to capture image data associated with the radiation substantially immediately before the imaging elements are exposed to the radiation. Embodiments may also include transmission of a second pulse to the imaging elements in order to read a second image frame from the imaging elements, wherein the second pulse is transmitted at a predetermined time after the exposure of the imaging elements to the radiation is complete, wherein one of the imaging elements produces second radiation after the exposure of the imaging elements to the radiation is complete, and wherein the predetermined time is a time suitable to substantially capture image data associated with the second radiation.

Electronic portal imaging for radiotherapy

X-ray portal imaging detectors have multiple layers, such as multiple layers of phosphor screens and/or detectors. Some x-rays that pass through one layer are detected or converted into light energies in a different layer. For example, one phosphor screen is provided in front and another behind that panel detector circuitry. Light generated in each of the phosphor screens is detected by the same detector circuitry. As another example, multiple layers of phosphor screens and associated detector circuits are provided. Some x-rays passing through one layer may be detected in a different layer. High energy x-rays associated with Megavoltage sources as well as lower or higher energy x-rays may be detected.

Multi-layer detector and method for imaging

A system to acquire a first image of a radiation field, the radiation field produced by a radiation beam, and to determine a second image based on the first image and based on a reference image of a reference radiation field having substantially homogeneous intensity, the second image representing characteristics of the radiation beam. Some embodiments provide acquisition of a first profile associated with a radiation beam using a radiation detection device, acquisition of a first image of a first radiation field produced by the radiation beam using an imaging device, determination of a map between the first image and the first profile, acquisition a second image of a second radiation field using the imaging device, and determination of a second profile based on the map and the second image.

Verification of radiation beam characteristics

Some embodiments include reception of a first instruction to enter an imaging mode, and, in response to the first instruction, automatic performance of at least one of: reduction of a focal spot size of a radiation beam, movement of a flattening filter out of a path of the radiation beam, replacement of a first target for photon emission with a second target for photon emission, or movement of a scatter-reducing filter into the path of the radiation beam. Embodiments may further include reception of a second instruction to enter a first radiation treatment mode, and, in response to the second instruction, automatic performance at least one of: increase of a focal spot size of the radiation beam, movement of the flattening filter into the path of the radiation beam, replacement of the second target with the first target, or movement of the scatter-reducing filter out of the path of the radiation beam.

Imaging mode for linear accelerators

A radiation imaging device includes a detector capable of detecting radiation from either a KV source or an MV source. The detector includes a photodetector assembly, a scintillator adjacent to a first side of the photodetector, and a metal plate adjacent to a second side of the photodetector. The detector may also include a second scintillator. The first side of the photodetector assembly is positioned toward the KV source for KV imaging, while the second side is positioned toward the MV source for MV imaging. The radiation imaging device includes a first gantry for the MV source and a second gantry for the detector. The KV source may be supported by either the first gantry or the second gantry. The second gantry includes a robotic arm for positioning the detector for imaging, and is configured for moving the detector (and the KV source) out of the MV beam.

Flat panel detector with KV/MV integration

A system includes acquisition of a first image of a first radiation field, at least a portion of the first radiation field comprising radiation attenuated by a device, and the first image including a representation of first scatter radiation generated during acquisition of the first image, acquisition of a second image of a second radiation field, at least a portion of the second radiation field comprising radiation attenuated by a volume corresponding to the device, and the second image including a representation of second scatter radiation generated during acquisition of the second image, and modification of the second image based on the first image to compensate for the second scatter radiation.

Imaging system to compensate for x-ray scatter

Some embodiments include a particle source, an RF power source, an accelerator waveguide, and an imaging device. The particle source is to generate a first injector current and a second injector current, the first injector current being less than the second injector current. The RF power source is to generate first RF power at a first pulse rate and second RF power at a second pulse rate, the first pulse rate being greater than the second pulse rate. The accelerator waveguide is to accelerate a first electron beam based on the first injector current and the first RF power and to accelerate a second electron beam based on the second injector current and the second RF power, and the imaging device is to acquire an image based on the first electron beam. The second electron beam may be used to deliver treatment radiation to a patient.

Megavoltage imaging system

X-ray therapy EPI artifact reduction and control of imaging is provided. Scanning of images is synchronized with the pulse rate of the x-rays. The scanning period is longer than the pulse rate period, so artifacts are generated within the resulting images. Due to the synchronization, the pulse variation artifacts are aligned across multiple images. The synchronization and resulting alignment of linear artifacts allows for gain correction as a function of lines within the image. Such gain correction reduces or removes non-linearities associated with pulse rate variation.

X-ray therapy electronic portal imaging system and method for artifact reduction

A system for capturing an image of transmitted radiation includes transmission of a disable signal to disable a bias light of a camera at a time prior to transmission of radiation, and acquisition of an image from the camera during transmission of the radiation and during deactivation of the bias light. In some embodiments, the disable signal is transmitted in response to the reception of a pre-radiation signal, the pre-radiation signal indicating that transmission of the radiation will commence approximately one frame scan time after the pre-radiation signal is received, and the disable signal is transmitted approximately when the pre-radiation signal is received.

Radiation imaging system

A system for determining congruence of a light field and a radiation field includes acquisition of first electronic image data representing a phantom as illuminated by light emitted by a light emitter, acquisition of second electronic image data representing the phantom as irradiated by treatment radiation emitted by the treatment radiation emitter, and determination of congruence of a light field produced by the light emitter and a treatment radiation field produced by the treatment radiation emitter based on the first electronic image data and the second electronic image data.

Verification of radiation and light field congruence

A system includes acquisition of first electronic image data representing a phantom located at a first position and irradiated by a first radiation field emitted by a radiation emitter, acquisition of second electronic image data representing the phantom located at a second position based at least on a first light field emitted by a light emitter and irradiated by a second radiation field emitted by the radiation emitter, generation of third electronic image data by correcting the second electronic image data based at least on the first electronic image data, and determination of a deviation between the first light field and the second radiation field based at least on the third electronic image data.

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Walnut Creek, CA, United States of America

Farhad Abbasi Ghelmansarai