Abstract: A radiation latency measurement system, having a pulse detector connected to a radiation detector mounted within a phantom that is configured to be positioned within a radiation treatment system which delivers a radiation dose to the radiation detector. The pulse detector has a first circuit that applies a high voltage bias to the radiation detector and a second circuit that amplifies the voltage signal from the radiation detector with a fixed gain first amplification stage and a variable gain second amplification stage. A first comparator receives the amplified signal and generates an output signal when the amplified signal exceeds a specified voltage level and a second comparator that processes and filters the output signal. The timing of receipt of the radiation dose signal may be compared to the position of the radiation detector in order to measure a radiation dose latency of the radiation treatment system.

Abstract: A deformable phantom, according to the present invention, has a housing made of a MRI invisible material enclosing a sealed reservoir filled with a MRI signal producing material, a piston slidably mounted within a sleeve and extending into the sealed reservoir, wherein the sleeve is slidably mounted to the housing and extends into the sealed reservoir, and a deformable structure within the sealed reservoir. The piston and sleeve move opposite to one another to conserve a constant fluid volume within the sealed reservoir as the piston moves in and out of the sealed reservoir to cause motion and/or deformation of the deformable structure.

Abstract: A radiation latency measurement system, having a pulse detector connected to a radiation detector mounted within a phantom that is configured to be positioned within a radiation treatment system which delivers a radiation dose to the radiation detector. The pulse detector has a first circuit that applies a high voltage bias to the radiation detector and a second circuit that amplifies the voltage signal from the radiation detector with a fixed gain first amplification stage and a variable gain second amplification stage. A first comparator receives the amplified signal and generates an output signal when the amplified signal exceeds a specified voltage level and a second comparator that processes and filters the output signal. The timing of receipt of the radiation dose signal may be compared to the position of the radiation detector in order to measure a radiation dose latency of the radiation treatment system.

Abstract: A deformable phantom, according to the present invention, has a housing made of a MRI invisible material enclosing a sealed reservoir filled with a MRI signal producing material, a piston slidably mounted within a sleeve and extending into the sealed reservoir, wherein the sleeve is slidably mounted to the housing and extends into the sealed reservoir, and a deformable structure within the sealed reservoir. The piston and sleeve move opposite to one another to conserve a constant fluid volume within the sealed reservoir as the piston moves in and out of the sealed reservoir to cause motion and/or deformation of the deformable structure.

Abstract: A MRI quality assurance phantom with a base and a vertical body mounted on the base. At lease one of the base and the vertical body have a housing made of a MRI invisible material and enclose a sealed reservoir filed with a MRI signal producing material. The vertical body has a generally planar face with one or more attachment points thereon for attachment of one or more accessories to the face of the vertical body. The interior walls of the housing, defining the shape of the sealed reservoir, have one or more defined structures formed thereon, suitable for image quality testing.

Abstract: A MRI quality assurance device, according to the present invention, has a housing made of a rigid MRI invisible material containing one or more sealed reservoirs containing a fluid MRI signal producing material. Each sealed reservoir has a first volume portion and a second variable volume portion in fluid communication therewith.

Abstract: A MRI quality assurance device, according to the present invention, has a housing made of a rigid MRI invisible material containing one or more sealed reservoirs containing a fluid MRI signal producing material. Each sealed reservoir has a first volume portion and a second variable volume portion in fluid communication therewith.

Abstract: A MRI quality assurance device, according to the present invention, has a housing made of a rigid MRI invisible material containing one or more sealed reservoirs containing a fluid MRI signal producing material. Each sealed reservoir has a first volume portion and a second variable volume portion in fluid communication therewith.

Abstract: A piezoelectric motor assembly for producing rotary motion, according to the present invention, has a motor frame and a circular body rotatably mounted on the motor frame having a diameter, a thickness, and a circumferential outer surface. At least two piezoelectric motors are mounted on the motor frame in tangential engagement with the outer surface of the circular body. The at least two piezoelectric motors are biased against the outer surface, resulting in an unbalanced net force on the circular body.

Abstract: A MRI quality assurance device, according to the present invention, has a housing made of a rigid MRI invisible material containing one or more sealed reservoirs containing a fluid MRI signal producing material. Each sealed reservoir has a first volume portion and a second variable volume portion in fluid communication therewith.

Abstract: A piezoelectric motor assembly for producing rotary motion, according to the present invention, has a motor frame and a circular body rotatably mounted on the motor frame having a diameter, a thickness, and a circumferential outer surface. At least two piezoelectric motors are mounted on the motor frame in tangential engagement with the outer surface of the circular body. The at least two piezoelectric motors are biased against the outer surface, resulting in an unbalanced net force on the circular body.

Abstract: The present invention relates to a subject placement device for use in a diagnostic and/or therapeutical treatment setting. The subject placement device of the present invention includes: (a) a board for receiving a body of the subject, and (b) a head cradle extending from said board, said head cradle being enabled to receive a range of head diameters.