The KV CBCT used in radiotherapy field mainly includes XVI of MEDICAL and OBI of Varian, which have a similar working process of acquiring CT image data before treatment, and then performing online alignment with the localization CT, and the treatment can be carried out if the obtained comparison result is within the tolerance error, and the system will automatically form a new position parameter if the comparison result is out of tolerance error. If the comparison result is out of the tolerance range, the system will automatically form a new position parameter and directly correct the position parameter of patient treatment, so as to realize the precise repetition of the position of patient positioning and treatment, and ultimately achieve the optimal therapeutic benefit of controlling the tumor and protecting the surrounding vital organs.
In 1992, Dr. John Wong began researching the feasibility of kV validation on a gas pedal platform at William Beaumont Hospital. 1995, the research team decided to focus on the application of kV CBCT on a gas pedal platform, and two years later the first kV CBCT images were obtained. The following year, the research team replaced the CCD image detector with a new aSi amorphous silicon flat-panel detector to complete the modification of the third generation experimental setup. The time came in 1999 when the first x-line flatbed volumetric scanning imaging device (XVI) was finally run successfully on the SL20 gas pedal platform. The success of this third-generation prototype led to a focus on KV CBCT, and the following year the team completed a fourth-generation prototype using a 41cm X 41
cm flat panel detector.