Intrafractional tumor position stability during computed tomography (CT)-guided frameless stereotactic radiation therapy for lung or liver cancers with a fusion of CT and linear accelerator (FOCAL) unit
| Autor: | Tadaharu Kojima, Kazuhiko Tahara, Akira Shioda, Minoru Uematsu, Atsushi Suda, Yukihiro Hama, Toshiharu Fukui, J. Wong, Masashi Kono, Shoichi Kusano |
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| Rok vydání: | 2000 |
| Předmět: |
Cancer Research
Lung Neoplasms medicine.medical_treatment Computed tomography Stereotactic radiation therapy Radiosurgery Linear particle accelerator medicine Humans Radiology Nuclear Medicine and imaging Radiation Lung medicine.diagnostic_test business.industry Liver Neoplasms Equipment Design Radiation therapy Tomography x ray computed medicine.anatomical_structure Oncology Lung disease Particle Accelerators business Nuclear medicine Tomography X-Ray Computed |
| Zdroj: | International journal of radiation oncology, biology, physics. 48(2) |
| ISSN: | 0360-3016 |
| Popis: | Purpose: To evaluate intrafractional tumor position stability during computed tomography (CT)-guided frameless stereotactic radiation therapy (SRT) for lung or liver cancers, we checked repeated CT scanning, with a fusion of CT and linear accelerator (FOCAL) unit. Methods and Materials: The FOCAL unit is a combination of a linear accelerator (Linac), CT scanner, X-ray simulator (X-S), and carbon table, and is designed to achieve CT-guided SRT with daily CT positioning followed by immediate irradiation while patients keep reduced shallow respirations. To evaluate intrafractional tumor position stability, 50 lung or liver lesions in 20 patients were checked by repeated CT scanning just before and after irradiation, and the obtained images were compared. Results: There was no case with the intrafractional error judged to be greater than 10 mm. In 68% of cases, the intrafractional positioning errors were negligible (0–5 mm). Conclusions: Using the FOCAL unit, SRT for lung or liver cancers could be performed with intrafractional positioning errors not greater than 10 mm. |
| Databáze: | OpenAIRE |
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