|MRI-LINAC Dynamic Phantom.|
The CIRS MRI-LINAC Dynamic Phantom is a precision instrument for assessing MRI image quality and testing tumor
localization and motion-capturing capabilities in modern radiation therapy departments utilizing stand alone MRI
simulators or integrated systems for IGRT, Adaptive IMRT and VMAT. It provides known, accurate and repeatable
three-dimensional target motion inside an MRI-compatible phantom. It is designed for comprehensive analysis
of image acquisition, planning and dose delivery as MRI emerges as a useful tool in various radiation therapy
The phantom body represents an average human thorax in shape and proportion. It is comprised of a plastic shell with a cylindrical thru-hole to accommodate a moving rod with simulated target. The embedded MRI/CT target is made of MRI gel that provides contrast with respect to the background so as to allow tracking of tumor motion. The target can receive an ion chamber or other MRI compatible dosimeter for treatment dose verification. The body is connected to a motion actuator box that induces three-dimensional target motion through linear translation and rotation of the rod.
Target motion is independently controlled with CIRS Motion Control Software. The graphical user interface provides an unlimited variety of motions while simplifying the operation of the MRI-LINAC Dynamic Phantom to an intuitive level. Patient specific profiles are easily imported and there is no need to make hardware adjustments or have special programming skills.
The MRI-LINAC Dynamic Phantom offers ease of use and portability as well as a flexible selection of motion profiles. All components are packaged in a protective case. The system requires minimal set-up and can be ready to use in minutes. The CIRS Model 008M MRI-LINAC Dynamic Phantom presents a sophisticated solution for the complex challenges and emerging technologies in Image-Guided Radiation Therapy.
Proven MRI-CT-LINAC Phantom TechnologyThe phantom body, moving rod with target and extended rigid shaft connection are MRI-compatible with 1.5T magnets. Motors and motion controller electronics are located at a safe distance from the magnet to ensure MRI image quality.
The phantom body approximates the average human thorax in both size and shape using simplified geometries. It is comprised of a plastic shell with a cylindrical thru hole to accommodate a moving rod with simulated target. The shell may be filled with MRI signal-generating medium of users choosing.
The moving rod with simulated target consists of a cylindrical rod filled with proprietary MRI Signal-generating gel. The embedded MRI/CT target is made of MRI gel that provides contrast with respect to the background. This target can receive an ion chamber or other MRI-compatible dosimeters for treatment dose verification.
The Model 008M contains MRI QA targets that are compatible with ACR accreditation program recommendations for MRI image spatial distortion and MRI field homogeneity.
The MRI-LINAC Phantom also enables Laser to ISO Center coincidence QA. Laser marks are machined on the outside of the MRI Shell body for both the moving MRI/CT target and the MRI Distortion Grid. To facilitate MRI/CT Image fusion, there is a central fiducial aligned with the exterior laser marks, and in a known position with respect to 3D spatial distortion grid. External alignment marks and central fiducial facilitate rapid orientation with positioning lasers and phantom image registration during MRI, CT and Linac positioning.
The actuator is positioned at an MRI-compatible distance from the phantom body by means of a modular extension rod. The extension rod is provided in 30 cm (1') increments to account for variances in magnetic field strength between systems. Connecting bridges simplify set up and provide extra stiffness to the extension rod.
True 3D Target Motion In an MRI-CT-LINAC Compatible PhantomThe moving insert with simulated target consists of a cylindrical rod filled with proprietary MRI Signal-generating gel. The embedded MRI/CT target is made of MRI gel that provides contrast with respect to the background. This target can receive an ion chamber or other MRI-compatible dosimeters for treatment dose verification.
The center of the target is positioned off central axis of the rod. Complex 3D motions can be achieved thru simultaneous, independently controlled linear translation and rotation.
Within the CIRS Motion Control software, the user inputs desired range of target motion in the inferior-superior (IS), anterior-posterior (AP) and the left/right (LR) directions. Using these inputs, the software computes the rotational angles based on known distance of the target center relative to the central axis of the rod. Rotation instruction is sent to the actuator by the software.
Perform MRI QA Without Another Phantom Set-up!The Model 008M contains an MRI Distortion Grid in the superior apex of the phantom body. It consists of a radial grid pattern for use in assessing ACR accreditation program recommendations for:
Separate use of MRI in concert with CT and LINAC makes ISO center coincidence checks critically important. To enable Laser to ISO center coincidence checks, laser marks are machined on the outside of the MRI shell body for both the moving MRI/CT target and the MRI Distortion Grid. To facilitate MRI/CT Image fusion, there is a central fiducial aligned with the exterior laser marks, and in a known position with respect to 3D spatial distortion grid. External alignment marks and central fiducial facilitate rapid orientation with positioning lasers and phantom image registration.
User Friendly Motion Control...The MRI-LINAC Dynamic Phantom is operated using CIRS Motion Control Software Suite, a user-friendly graphical user interface that can be installed on any computer running Windows OS. Upon installation, the user has the option to select
|the phantom that is to be controlled by the software.|
Amplitude, cycle time and phase shift can be applied using slider bars or by entering desired values within the limits of the system. Five different waveforms are available from a standard pull down menu.
An unlimited number of clinically relevant and patient specific waveforms or correlation models can be imported from tab delimited or comma separated file formats.
There are also waveform editing, smoothing and analyzing tools to ease the optimization of custom waveforms. All motion files can be saved for future use.
The software provides a convenient, real-time graphic display with relevant information about the waveform selected for each direction of simulated tumor. In addition, the ROI analyzing function provides the time spent by the target between two chosen amplitudes and the average time weighted position for that particular ROI.
Users can instantly start, stop or pause the motion at any time. New start positions can be graphically selected and applied making the device very useful for static test as well as dynamic testing. Users can also select the number of cycles to be looped by entering the desired value or choose continuous looping (1 million cycles).
The Advanced Motion Parameters window contains a Research Mode that allows researchers to import 3D (x ,y, z) recorded waveforms. Once the research mode is selected, the software automatically calculates the best scenario to simulate the real 3D waveform and simulated volume is achieved.
Advanced Electromechanical ComponentsACTUATOR:
Housed within anodized aluminum enclosures, the actuator contains bipolar stepper motors that enable linear motion accuracy of 0.05 mm and rotational motion accuracy of 0.2°. Linear motion of the target in the (IS) direction can be isolated from rotational motion in the axial plane in both frequency and amplitude. Motions can be synchronized to one another with accuracy better than 20 msec. Motion cycle time accuracy is better than 5 msec. Optical sensors ensure precise mechanical positioning. The actuator is designed for continuous operation. If not manually stopped and reset by the user, it will perform 1000000 (in continuous mode) cycles then stop automatically.
Motions are generated through a three-axis motion controller. A USB port enables interfacing with most computers. The controller sends motion data and supplies power to the actuator thru a 25 pin serial cable. The motion controller can be fully operated through CIRS Motion Control Software (see page 5) from a distance of up to 75 feet with the Ethernet/USB cable provided.
Additional Options...DYNAMIC THORAX PHANTOM BODY:
The Model 008A-20 includes the Dynamic Thorax Phantom Body and Surrogate Platform. The Dynamic Thorax Phantom Body is interchanged with the MRI-LINAC Dynamic Phantom Body while the Surrogate Platform is attached to the Motion Actuator Box. The Dynamic Thorax Phantom Body represents an average human thorax in shape, proportion and composition. Various
|lung equivalent rods containing a spherical target or various detectors are available and are inserted into the lung
equivalent lobe of the phantom. The Model 008M can also accommodate many of the interchangeable inserts designed for
the Model 008A. The body is connected to a motion actuator box that induces three-dimensional target motion through
linear translation and rotation of the lung equivalent rod. The CIRS Motion Control Software has been pre-programmed to
allow the user to select the phantom that is to be controlled by the software.|
DYNAMIC PELVIS PHANTOM BODY:
The Model 008P-06 Dynamic Pelvis Phantom body represents an average human pelvis in shape, proportion and composition. A water equivalent cube containing a prostate gland and/or various detectors is inserted into the pelvic cavity of the phantom. The cube is connected to the motion actuator box to induce two-dimensional target motion through rotation of the water-equivalent cube. The CIRS Motion Control Software has been pre-programmed to allow the user to select the phantom that is to be controlled by the software.
NOTE: Since the thorax and pelvis bodies are not MRI signal generating, they can be seen only in X-ray and CT imaging. For this reason, the thorax and pelvis bodies are mounted on the actuator based plate and the resulting phantom (Model 008A and Model 008P, respectively) should not be used in MRI systems.
OVERALL DIMENSIONS: 67 cm x 32 cm x 20 cm
OVERALL WEIGHT: 10 kg (22 lb)
AMPLITUDE, IS: ± 25 mm
AMPLITUDE, AP/LR: ± 10 mm
MOTION ACCURACY: ± 0.1 mm
CYCLE TIME: 1 - ∞ (adjusted based on amplitude)
WAVEFORMS: sin (t), 1-2cos4(t), 1-2cos6(t), sawtooth, sharkfin
SOFTWARE SYSTEM REQUIREMENTS: Windows XP® / Vista / Windows 7 (32 or 64 bit) Pentium 3® or equivalent 512 MB RAM/2 MB of available disk space.
OVERALL DIMENSIONS: 25.6 cm x 32 cm x 20 cm
OVERALL WEIGHT: 17 kg (38 lb)
OVERALL DIMENSIONS: 32.7 cm x Ø 6.3 cm
OVERALL WEIGHT: 1.5 kg