Abstract:
A three-dimensional detector module for use in detecting annihilation photons generated by positrons emitted from radio-labeled sites within a body is formed from multiple solid state photo-detectors attached to one or more scintillators. Each photo-detector can be attached to a scintillator to form a photo-detector/scintillator combination and multiple photo-detector/scintillator combinations can be arranged in an array. Alternatively, multiple photo-detectors can be attached to the surface of a single scintillator to form an array. Multiple arrays are then stacked to form a photo-detector module. The modules can then be assembled to form a sheet of photo-detector modules. Multiple sheets or multiple modules can then be arranged around a body to detect emissions from radio-labeled sites in the body. Multiple position sensors attached to the photo-detectors, arrays or modules provide the ability to locate the source of the positron emissions from the labeled sites in the body and generate an image of the emission site. A series of novel PET configurations can be constructed from these detector modules, making PET scanners portable, more sensitive and flexible to be used in numerous different operational configurations, such as operating room, emergency rooms, critical care units, or battlefield.
Abstract:
An apparatus configured to control a magnetic field strength of a magnetic lens is provided. The apparatus may include a magnetic sensor configured to generate an output signal responsive to a first magnetic field strength of the magnetic lens. The apparatus may also include a control circuit coupled to the magnetic sensor and the magnetic sensor. The control circuit may be configured to receive the output signal from the magnetic lens and to receive an input signal responsive to a predetermined magnetic field strength. The control circuit may be further configured to generate a control signal responsive to the output signal and the input signal. Additionally, the control circuit may be configured to apply a current to the magnetic lens such that a second magnetic field strength may be generated within the magnetic lens closer to the predetermined magnetic field strength than the first magnetic strength.