Quality Assessment of Stereotactic Radiosurgery of a Melanoma Brain Metastases Model Using a Mouselike Phantom and the Small Animal Radiation Research Platform
Autor: | Cheng Shie Wuu, Paul J. Black, David Welch, Yong Hum Na, Cheng-Chia Wu, Kunal R. Chaudhary, Peter Canoll, Simon K. Cheng, Tom K. Hei, Adam M. Sonabend, Tony J. C. Wang, Yvonne M. Saenger |
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Rok vydání: | 2017 |
Předmět: |
Male
Cancer Research Cone beam computed tomography Time Factors Quality Assurance Health Care medicine.medical_treatment Contrast Media Radiosurgery Multimodal Imaging Imaging phantom Article 030218 nuclear medicine & medical imaging law.invention 03 medical and health sciences Mice 0302 clinical medicine law medicine Animals Radiology Nuclear Medicine and imaging Radiation treatment planning Melanoma Radiation medicine.diagnostic_test business.industry Brain Neoplasms Phantoms Imaging Isocenter Collimator Magnetic resonance imaging Radiotherapy Dosage Cone-Beam Computed Tomography Magnetic Resonance Imaging Sagittal plane Tumor Burden Mice Inbred C57BL medicine.anatomical_structure Oncology 030220 oncology & carcinogenesis business Nuclear medicine |
Zdroj: | International journal of radiation oncology, biology, physics. 99(1) |
ISSN: | 1879-355X |
Popis: | Purpose To establish a novel preclinical model for stereotactic radiosurgery (SRS) with combined mouselike phantom quality assurance in the setting of brain metastases. Methods and Materials C57B6 mice underwent intracranial injection of B16-F10 melanoma cells. T1-weighted postcontrast magnetic resonance imaging (MRI) was performed on day 11 after injection. The MRI images were fused with cone beam computed tomography (CBCT) images using the Small Animal Radiation Research Platform (SARRP). The gross tumor volume (GTV) was contoured using the MRI. A single sagittal arc using the 3 × 3 mm2 collimator was used to deliver 18 Gy prescribed to the isocenter. MRI was performed 7 days after radiation treatment, and the dose delivered to the mice was confirmed using 2 mouselike anthropomorphic phantoms: 1 in the axial orientation and the other in the sagittal orientation. The SARRP output was measured using a PTW Farmer type ionization chamber as per the American Association of Physicists in Medicine Task Group report 61, and the H-D curve was generated up to a maximum dose of 30 Gy. Irradiated films were analyzed based on optical density distribution and H-D curve. Results The tumor volume on day 11, before intervention, was 2.48 ± 1.37 mm3 in the no-SRS arm versus 3.75 ± 1.19 mm3 in the SRS arm (NS). In the SRS arm, GTV maximum dose (Dmax) and mean dose were 2048 ± 207 and 1785 ± 14 cGy. Using the mouselike phantoms, the radiochromic film showed close precision in comparison with projected isodose lines, with a Dmax of 1903.4 and 1972.7 cGy, the axial and sagittal phantoms, respectively. Tumor volume 7 days after treatment was 7.34 ± 8.24 mm3 in the SRS arm and 60.20 ± 40.4 mm3 in the no-SRS arm (P=.009). No mice in the control group survived more than 22 days after implantation, with a median overall survival (mOS) of 19 days; mOS was not reached in the SRS group, with 1 death noted. Conclusions Single-fraction SRS of 18 Gy delivered in a single arc can be delivered accurately with MRI T1-weighted postcontrast–based treatment planning. The mouse like phantom allows for verification of dose delivery and accuracy. |
Databáze: | OpenAIRE |
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