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[Cone-beam computed tomography-derived adaptive radiotherapy]
- Source :
- Nihon Hoshasen Gijutsu Gakkai zasshi. 68(2)
- Publication Year :
- 2012
-
Abstract
- The purpose of this study was to evaluate the reliability of cone-beam computed tomography (CBCT)-derived adaptive radiotherapy. We evaluate planning computed tomography (pCT) and CBCT in 50 patients who had undergone image guided radiotherapy (IGRT) with CBCT. Irradiated sites included head, neck, chest, abdomen, and pelvis; there were 10 patients in each group. Treatment plans including 153 beam data were recalculated based on CBCT. To compare between pCT and CBCT, we estimated CT values of normal tissues, body contour, effective depth, and monitor units (MU) calculation. The maximum difference in CT values was observed in lung estimation. The 5 mm or more differences in depth were observed in 2 beams of 2 pelvic cases, but CBCT also demonstrated a shift of abdominal wall due to intestinal motility. There were downward trends for the effective depth and MU based on CBCT, especially in lung cases. However, the differences in prescribed dose due to MU calculation were less than 5% because all patients were treated with a multifield irradiation plan. CBCT provides not only precise daily setup but also accurate anatomical information on body contour. In addition, CBCT may be considered as a useful tool for dose calculation.
- Subjects :
- Radiography, Abdominal
medicine.medical_specialty
Cone beam computed tomography
medicine.medical_treatment
urologic and male genital diseases
Pelvis
stomatognathic system
medicine
Humans
Adaptive radiotherapy
Lung
Image-guided radiation therapy
business.industry
Radiotherapy Planning, Computer-Assisted
Radiotherapy Dosage
General Medicine
respiratory system
Cone-Beam Computed Tomography
equipment and supplies
Effective depth
Radiation therapy
medicine.anatomical_structure
Abdomen
Radiology
Tomography
Nuclear medicine
business
Head
Neck
Subjects
Details
- ISSN :
- 18814883
- Volume :
- 68
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Nihon Hoshasen Gijutsu Gakkai zasshi
- Accession number :
- edsair.doi.dedup.....a23275e62177c0d43841bec8596821a6