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Verification of dynamic multileaf colimator
HRACHOVEC, Radovan
In connection with introducing new technologies in radiotherapeutic centres, these are being equipped with linear accelerators featuring computer-controlled multi-lamellar colimators and radiotherapeutic technology with modulated intensity of the IMRT radiation bunch. The methodology of an independent test of the MLC collimator for the CLINAC 2100 C/D, so called dosimetric lamellar separation deals with measurement using the array seven 29. This method could supplement the test of the service stability in the radiotherapeutic centre of the Oncology department of the České Budějovice hospital.
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Comparison dose distribution of conventional radiotherapy with the application of IMRT
FÁBERA, Michal
The bachelor thesis deals with examination of techniques used in radiotherapy, and comparison of dose distribution in PTV and critical organs for conventional radiotherapy and the intensity modulated radio therapy (IMRT).The main aim of the work was to summarize present therapeutic methods in radiotherapy and to compare dose distribution in conventional radiotherapy and application of the intensity modulated radio therapy.
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The effect IMRT technique by the head and neck tumors looking on the total dose in the organs at risk and the target volumes
WOLFOVÁ, Barbora
The effect IMRT technique by the head and neck tumors looking on the total dose in the organs at risk and the target volumes This work compares two techniques of planning radiotherapy in the head and neck areas. The technique used will be IMRT - Intensity Modulated Radiotherapy. The development of new technologies in radiotherapy equipment has also brought a wider range of methods of treating carcinomas. The IMRT technique represents a breakthrough in this process and that is why it is dealt with in this work as far as its advantages, as compared with conventional radiotherapy methods, are concerned. I have focused mainly on the distribution of doses in target volumes and critical organs, in particular in the salivary glands and the spinal chord. The region of the head and throat is an area containing the kinds of tissue with various sensitivity and tolerance to radiotherapy. The damage to such tissues has an enormous impact on the patient. That is why the region is a very suitable place for assessing the advantages of the IMRT as compared with conventional techniques. Ten plans from a set of patients suffering from tumour in the area of head and throat have been evaluated in this work by means of DVH (Dose Volume Histogram). The individual plans have been interpreted, conventional plans and IMRT ones separately. I have focused on comparing mean doses and the subsequent comparison of doses of 5 per cent and 95 per cent of the irradiated volume PTV, maximum doses on the spinal chord, and doses of 50 per cent of the irradiated volume of the salivary glands in the individual plans.
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Quality assurance IMRT plans
LOŠKOVÁ, Michaela
We may regard the Intensity-Modulated Radiation Therapy (IMRT) as a break-through and progress concerning the treatment of oncogenous diseases. In practice, this new method experienced an extensive development as early as at the end of 1990s. At the present time, the IMRT is a medical treatment used in an increasingly frequent manner. It concerns predominantly such oncogenous diseases, the treatment of which based on the above-mentioned method is applicable due to the localization of the disease. The IMRT enables a more effective distribution of a dose in the target volume than in case of the conventional radiotherapy. It is also possible to realize maximum treatment of the surrounding healthy tissues. For the purpose of clinical use of the IMRT, however, it is necessary to verify the correspondence between the dose planned and the dose actually realized in the target volume. From the large quantity of correspondence verification methods available, I decided to select the three following ones to be covered in this paper: - portal dosimetry method - measurement using special phantom - measurement using 2D filed of the Seven29 detectors. The goal of my work was to compare these three methods of verification of the IMRT plans and in addition, to verify the applicability of the 3% tolerance criterion for all the above-mentioned methods of verification. The portal dosimetry method is applicable for verification of fluency; it is fully sufficient and not time-consuming for the purpose of clinical use. The measurement using 2D field provides for sufficiently accurate information on a dose{\crq}s distribution in the modulated field, however, it is more time-consuming and the measuring device is not integrated in the system of the radiation apparatus. Verification using special phantom is considerably time-consuming and it provides for information on a dose{\crq}s distribution in a small quantity of points. The DD=3% criterion I selected is applicable to all three methods with the exception of areas with extensive modulation of the dose and areas on the verge of the field.
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RADIATION PROTECTION OF PATIENT WITH USING INTENSITY MODULATED RADIOTHERAPY (ImRT) {--} DOSIMETRIC VERIFICATION OF TREATMENT PLAN.
KLEČKOVÁ, Naděžda
Nowadays more and more radiotherapy departments use intensity modulated beams for treatment of patients. Intensity modulated radiotherapy (ImRT) is able to modificate intensity of radiation across the iradiated field. In this way it is posible to achieve better dose conformity than in conventional radiotherapy. Implementation of ImRT allows us to escalate dose to target volume with same side effects of organs at risk as in conventional radiotherapy or to reduce normal tissue complication - decrease dose to organ at risk with the same tumour dose. This fact reguires extension of our guality system to all network of delivery dose to patients, inclusive linear accelerator with multileaf collimator, treatment planning system, electronic portal imaging device and so on. Quality assurance is guaranteed both periodical user tests and independent verification of The State Office for Nuclear Safety. The aim of this work is finding the optimal and effective way for the verification treatment plans, determining criteria for evaluation measured results, proposing summary all aspects of radiation protection patients which are treate ionisation beams with intensity modulated radiotherapy. The optimization one of the principles of radiation protection will be provided by routin verification treatment plans.
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