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The Logos Systems X-ray and Proton beam camera phantoms perform fast and accurate machine Quality Assurance (QA) tests while saving you time and expense.

TG-142 states that the "... the coincidence of collimator, gantry, and couch axes with the isocenter is recommended to be within 1 mm for stereotactic machines ..." Another section of the report reads: "It is, therefore, critical to ensure the coincidence of these two coordinate systems for different clinical needs of image-guided radiation therapy procedures... The accuracy of this process should be done on the daily basis, especially for SRS/SBRT."

The strength of the XRV-124 (and XRV-100) is the quick verification of multiple coordinate systems (gantry, couch, collimator, kV imager, radiation source, and room lasers) with the intended dose isocenter. These phantoms provide more useful data, in a shorter time, with a lower cost-per-test than existing dose measuring technologies such as film, ionization chambers/diodes, and water tanks. They verify the 3D performance of the radiation delivery robot/gantry, tumor tracking cameras (kV imagers), beam shaping mechanism (MLC or Iris), and X-ray source (linear accelerator), and overall control system in real time with high accuracy. Complete QA plans that range in complexity from a simple Winston-Lutz to a non-isocentric volume can be captured directly to computer memory without pausing the treatment.

Advantages over Film

The 3D XRV-124 and XRV-100 cone-based systems set up faster than film, produce 3D data more quickly, require no human intervention, and have a lower cost-per-test. Film requires a technician’s time to position, expose, and scan it each time a new test is performed. A piece of film can only produce 2D information, so multiple pieces of film must be used to construct the 3D information needed to diagnose the delivery robot/gantry accuracy. Each piece of film and every block of time adds to the cost of a test. Film handling also introduces the potential for human error. Film inventory must be monitored and re-ordered when the stock dwindles. The XRV-100 and XRV-124 replace all of these film problems with a fast, easy to use, digital system.

Advantages over Radiation Sensors

The XRV-124/100 detect local gradients more accurately than radiation sensors, provide 3D information about the direction of the radiation, have finer resolution (with repeatability close to .05 mm) for positional information, and have a lower cost-per-test. Ionization chambers and diodes can only measure radiation at a single point in space. Their 2D arrays cannot directly detect local gradients in the radiation field, cannot detect variations caused by the angle of the radiation, and cannot provide 3D information about the direction of the radiation. These sensors must be placed in planar or cylindrical 2D arrays to allow adequate data to be captured, which adds significantly to the test system cost and complexity. Because there are gaps between the individual devices (typically 4 to 10 mm), the sensor’s resolution may be inadequate for providing reliable 2D/3D information, particularly for small diameter beams. The XRV-100 and XRV-124 provide 3D results at higher resolutions than typical 2D radiation sensors.

Advantages over Water Tank Systems

The XRV-124 and XRV-100, which can be placed by hand onto the couch, provide real-time 3D information, making it convenient to use daily or even before each treatment, in the intervals between water tank testing sessions. In water tank systems, a single ionization chamber or diode is mechanically moved through a volume of water in order to develop 3D information about the radiation field. It provides no information about the aiming accuracy of the robot/gantry. The mechanisms needed to move the radiation sensor through the tank medium are slow. Beam QA with this technique is typically done at commissioning and then annually for depth dose comparisons to commissioned values. For proton range verification, our couch-top Ranger-300 Bragg Peak Imaging tool with the XRV-3000 Eagle or XRV-4000 Hawk provide accurate range measurements in a medium that is within 3% of equivalent water density.

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