Tomosynthesis is a method of producing three-dimensional cross-sectional images in the body by accumulating projection views from several view angles and reconstructing the data into tomographic slices. The Imatrex Tomofluoroscopy™ system with Multiple Source X-ray Technology can reconstruct 3-D images of moving organs in real-time, up to 6 or more 3-D frames per second. When the X-ray sources' positions are set to surround the therapy beam source, the resulting transverse tomographic images are said to represent the "Beam's Eye View" (BEV). They therefore provide an image that displays the cross-section of a tumor mass from the viewpoint of the therapy beam. Our simulations have shown that by using a tomographic angle of 30 degrees, such slices approach Computed Tomography image quality and are more than adequate for tumor tracking.
To provide BEVT images in realtime, Imatrex has designed a unique multi-source X-ray tube that uses a small scanning electron beam to move the focal spot to each of 19 focal positions. This tube will be placed just under the Dynamic Multi-Leaf-Collimator (DMLC) of modern linear-accelerator-based radiotherapy gantries. The projection images are recorded on the existing Portal Area Detector system, which is designed for interlaced kV-MV imaging. The exact tumor contour positions will be determined from the realtime BEVT images and the coordinates provided to the DMLC controller for realtime adjustments of the radiotherapy beam profile. Updates will be provided with a frequency of one per second or faster.
Our TumoTrak product is an integrated system consisting of the multi-source tube, integration with the kV-MV portal detector, realtime tomosynthesis reconstruction system, and automatic target recognition software, which will be sold on an OEM basis to existing Radiotherapy vendors.
Who Would Benefit Using BEVT
Virtually all patients undergoing radiation therapy will benefit from real-time tracking of tumors and surrounding structures possible with this system. This product will enable radiation oncologists to develop improved and more effective treatment plans intended to enhance the outcomes for patients.
For Radiotherapy providers, the addition of a TumoTrak™ system to your gantry will ensure that you can provide the latest optimum treatment plans for your patients. Also, the improvements in positioning, workflow, and portal monitoring may lead to significant reductions in operational and maintenance costs.
For more information on the Imatrex TumoTrak™ system for Image-Guided Radiation Therapy, contact us.