RapidArc radiotherapy technology is a new form or development of tekni IMRT (intensity-modulated radiation therapy). 3-D picture of the contours of the tumor determine the target facilitate radiation and the radiation dose given arrives. This means the radiation dose to the target tumor and reducing the dose to surrounding healthy tissue. The entire volume of the tumor receives the radiation dose during one full rotation plane linac. Rapid Arc involve various intensities of radiation (in this case, high-energy X-rays) are used as a therapy for cancer.
To give Astrocytoma cancer treatment, doctors use computer-generated images to plan and then give a focused beam of radiation to the cancer Astrocytoma. At this pidArc TeknikRa doctor can provide proper radiation doses that conform to the shape of the tumor, while limiting the amount of radiation that reaches the surrounding healthy tissue. A significant benefit given the RapidArc technique is the speed of treatment. A RapidArc treatment was delivered with a 360-degree rotation of the plane linac, which takes 4-5 minutes.
METHOD RapidArc treatment involves three basic steps, namely: diagnosis, treatment planning and radiation dose data transmission. The steps to create planning Rapid Arc radiotherapy technique in patients with astrocytoma is as follows: Preparation before the simulated patient is positioned in such a way on the examination table Ct-simulator and made masks made of TERMOPLAST for fixation and immobilization of the patient. Figure 3. Making the mask head Then the simulation process is carried out in 3-D patients with Ct-Scan to set an upper limit on the apex and lower bounds on supraclavicula and given a 3-point reference markers of lead as a guide when the new pitch shift. CT-Scan data is sent to TPS (Treathment Planning System) via Dicom.
TPS is done in the process of tumor targets contour (PTV) and organs should be protected by the radiation oncologist. Organs at risk should be protected include: the brain stem, eyes R / L, the optic nerve R / L, eyepiece R / L, the inner ear R / L, Optic chiasma, and brain. Then do the planning Rapid Arc at the polling station by determining the total dose and dose perfraksi, gantry, collimator, irradiation field, optimization, calculation and DVH analysis. The total dose given in the case of 5940 cGy astrocytoma granted for 33 fractions and a dose of 180 cGy per fraction. Once the planning is completed QA (Quality Assurance) or verification of radiation dose planning Rapid Arc with Matrix.
This is done so that the planned radiation dose at the same polling station with the dose given to the patient during treatment. After verification of the dose is appropriate, and new patients can be in treatment in the linac. Before irradiation, carried out in accordance with the pitch shift TPS results by making 3-point reference markers as a guide. After the verification of the irradiation field image with OBI (On Board Imager) and CBCT (Cone Beam CT), as a guide is a picture of a CT scan at the time of the simulation. This process is called IGRT (Image Guide Radiotherapy). Figure 4. Figure 5. Overview Overview OBI CBCT After Ct-Scan picture and picture are the same or appropriate planning, new irradiation in patients. IGRT with OBI verification process conducted every day whereas the CBCT performed 1 time per week.