9. SAYFAYA BENZER SAYFALAR
Prostat radyoterapisinde 3 boyutlu bilgisayarlı planlama ve dozimetrik sürecin randofantom üzerinde tld dozimetre ile kontrolü - Sayfa 9SUMMARY
In prostate comparing of measured doses from TLD dosimeters with 3D computerized radiotherapy planning.
Purpose of this study is to control dosimetric process for the 3D computerized radiotherapy planning (CTPS) of prostate with comparing of measured doses from thermoluminescence (TLD) dosimeters experimentally.
In this study is planed and performed Uludağ University Medical Faculty Rad...
Meme kanseri radyoterapisinde 3 boyutlu bilgisayarlı planlama ve dozimetrik sürecin randofantom üzerinde termolüminesans dozimetri ile kontrolü - Sayfa 8SUMMARY
Control of dosimetric process and 3D computer-based treatment planning system with thermoluminescence dosimeters (TLD) at the randophantom, in breast radiotherapy.
The purpose of this study is to compare the target volume and critical organ doses which are obtained from two different methods (source-skin distance (SSD) and sourceaxis distance (SAD)) at the left breast radiotherapy with e...
9. SAYFADAKI ANAHTAR KELIMELERfieldthistreatmentwithstudyplanning
9. SAYFA ICERIGI
Control of dosimetric process and 3D computer-based treatment planning system with thermoluminescence dosimeters (TLD) at the randophantom, in head and neck radiotherapy.
Purpose of this study is to control dosimetric process for the 3D computerized radiotherapy planning of head and neck with the comparison of measured doses from thermoluminescence dosimeters experimentally.
In this study we use dosimetric equipment, treatment devices and randofantom of Uludağ University Medical Faculty Radiotherapy department. Fake thermoluminescence dosimeters (TLD) that have the same properties as real TLDs, were implanted to the points which assigned to represent target volume and critical organs. The mask that used to fix head and neck patients, applied then fantom at the treatment position taken to the computerized tomography-simulator and screened by 0,5 cm intervals. Target volume and neighbour critical organs contoured and then send to the computerized treatment planning system (CTPS). Conventional hypopharynx radiotherapy fields defined at the virtual simulation. The lateral and supraclavicular fields that fits to digital radiographs drawn on the randofantom at the conventional simulation. Simulation radiographs taken to the CTPS to control the fields and blocks then determined point doses. Calibrated TLDs implanted in the randofantom points that assigned before. For the treatment tecnique irridation applied for 5 times to get the average of the measured values. Before the irradiation, port films taken from the treatment fields and compared to the simulation radiographs to control the fields. In this study, target volume and critical organ (medulla spinalis, parotid etc.) doses analysed. Also, at the joint platform of lateral and supraclavicular field doses controlled. Difference between the CTPS and measured doses lower than +/-%5 were taken in the acceptable margins.
The mean of measured doses from 2 points at the target volume (hypopharynx) were 203,5 cGy and mean of calculated CTPS doses were 207 cGy. The difference between measured and calculated doses are below %2 in the clinic target volume. Maximum difference of measured and calculated doses at the supraculavicular and lateral field junction plane is %3,49. At the lymph node regions, that are within the planning treatment volume, the maximum difference was %3,59. For the organs at risk that were placed in the planning treatment volume such as medulla spinalis, brain stem, parotid glands, middle ear and optical