Patent ID: 8825137

Claim:
An apparatus comprising: a vaginal cylinder with embedded fiducials and a connector extension for insertion into a vagina; a position adjusting assembly consisting of six adjusting knobs, whereby each knob is responsible for the quantitative adjustment of one degree of freedom of the vaginal cylinder; the position adjusting assembly which is firmly mounted to a treatment couch of an image guided external beam radiation system connected to the vaginal cylinder via the connector extension to adjust a patient's position such that the treatment alignment center is aligned with the radiation delivery system's coordinate system; utilize a formula consisting of A=C Sp C ST −1 , where A is the transformation matrix, C Sp is the 3-D coordinates of the vaginal cylinder in a generated treatment dose plan and C ST is the coordinate of the vaginal cylinder for: comparing the current coordinate of the vaginal cylinder as reported by the image guidance system to the coordinate of the vaginal cylinder in the generated dose plan; and determining the difference or displacement of the vaginal cylinder by entering the correction value of each degree of freedom derived from the transformation matrix A into the position adjusting assembly to reproduce the location of the vaginal cylinder relative to the patient's anatomy, for the delivery of a radiation dose to the target volume based on the generated treatment dose plan.