Dosimetric Uncertainties Resulting From Interfractional Anatomic Variations for Patients Receiving Pancreas Stereotactic Body Radiation Therapy and Cone Beam Computed Tomography Image Guidance
| Autor: | Bruce D. Minsky, Gabriel O. Sawakuchi, Neal Rebueno, Emma B. Holliday, Yufei Liu, Sylvia S. W. Ng, R. Martin, Grace L. Smith, L Perles, Sam Beddar, Albert C. Koong, Prajnan Das, Ethan B. Ludmir, Joshua S. Niedzielski, Joseph M. Herman, Eugene J. Koay, Cullen M. Taniguchi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Cancer Research
Cone beam computed tomography Radiation Stereotactic body radiation therapy business.industry Radiotherapy Planning Computer-Assisted Isocenter Radiotherapy Dosage Cone-Beam Computed Tomography Radiosurgery Article medicine.anatomical_structure Oncology Planned Dose Humans Medicine Radiology Nuclear Medicine and imaging Radiometry Radiation treatment planning Fiducial marker Nuclear medicine business Image guidance Pancreas |
| Zdroj: | Int J Radiat Oncol Biol Phys |
| ISSN: | 0360-3016 |
| Popis: | PURPOSE/OBJECTIVES: To estimate the effects of interfractional anatomic changes on dose to organs-at-risk (OARs) and tumors, as measured with cone-beam computed tomography (CBCT) image guidance for pancreatic stereotactic body radiotherapy (SBRT). MATERIALS/METHODS: We evaluated 11 patients with pancreatic cancer, whom were treated with SBRT (33–40 Gy in 5 fractions) using daily CT-on-rails (CTOR) image guidance immediately before treatment with breath-hold motion management. CBCT alignment was simulated in the treatment planning software by aligning the original planning CT to each fractional CTOR image set via fiducial markers. CTOR datasets were used to calculate fractional doses after alignment by applying the rigid shift of the planning CT and CTOR image sets to the planning treatment isocenter and recalculating the fractional dose. Accumulated dose to the gross tumor volume (GTV), tumor vessel interface (TVI), duodenum, small bowel, and stomach were calculated by summing the 5 fractional absolute dose-volume histograms (DVHs) into a single DVH for comparison with the original planned dose. RESULTS: Four patients had a GTV D100% of at least 1.5 Gy less than the fractional planned value in several fractions; 4 patients had fractional underestimation of duodenum dose by 1.0 Gy per fraction. The D1.0 cm(3) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|