Evaluation of Absorbed Dose from Kilovoltage Cone-beam Computed Tomography by Radiotherapy Planning System: Influence on the Radiation Therapy for Prostate Cancer
| Autor: | Yoshiaki Okamura, Mamoru Hase, Kunihiko Kimura, Tetsuro Kawamura, Daisuke Miyawaki, Naoki Murakami, Ryohei Sasaki, Hideki Nishimura |
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| Rok vydání: | 2013 |
| Předmět: |
Male
Kilovoltage Cone Beam Computed Tomography medicine.medical_specialty Dosimeter business.industry Radiotherapy Planning Computer-Assisted medicine.medical_treatment Computed tomography dose index Prostatic Neoplasms Radiotherapy Dosage General Medicine Cone-Beam Computed Tomography equipment and supplies Radiation therapy stomatognathic system Absorbed dose medicine Humans Dosimetry Computer Simulation Thermoluminescent dosimeter Radiology Nuclear medicine business Image-guided radiation therapy |
| Zdroj: | Japanese Journal of Radiological Technology. 69:491-499 |
| ISSN: | 1881-4883 0369-4305 |
| DOI: | 10.6009/jjrt.2013_jsrt_69.5.491 |
| Popis: | Image-guided radiation therapy (IGRT) is increasingly being used in modern radiation therapy, and it is now possible to verify a patient's position using kilo-voltage cone-beam computed tomography (kV-CBCT). However, if kV-CBCT is used frequently, the dose absorbed by the body cannot be disregarded. A number of studies have been made on the absorbed dose of kV-CBCT, in which absorbed dose measurements were made using a computed tomography dose index (CTDI) or a thermoluminescent dosimeter (TLD). Other methods include comparison of the absorbed dose between a kV-CBCT and other modalities. These techniques are now in common use. However, dose distribution within the patient varies with the patient's size, posture and the part of the body to which radiation therapy is applied. The chief purpose of this study was to evaluate the dose distribution of kV-CBCT by employing a radiotherapy planning system (RTPS); a secondary aim was to examine the influence of a dose of kV-CBCT radiation when used to treat prostate cancer. The beam data of an on-board imager (OBI) was registered in the RTPS, after which modeling was performed. The radiation dosimetry was arranged by the dosimeter in an elliptical phantom. Rotational radiation treatment was used to obtain the dose distribution of the kV-CBCT within the patient, and the patient dose was evaluated based on the simulation of the dose distribution. In radiation therapy for prostate cancer, if kV-CBCT was applied daily, the dose increment within the planning target volume (PTV) and the organ in question was about 1 Gy. |
| Databáze: | OpenAIRE |
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