Abstract
Purpose
To determine the radiation dose to mouse cancer xenografts from serial micro-computed tomography (CT) examinations.
Procedures
A nude mouse with a 15-mm subcutaneous pancreatic cancer xenograft in the rightflank was used. Radiation exposure to the subcutaneous tumor and the mouse pancreas (to simulate an orthotopic pancreatic tumor model) was measured using lithium fluoride thermoluminescent dosimeters. Ultrafast micro-CT was performed using 80 kVp, 0.26 mA, 0.156 mm slice thickness, 256 slices, 0.7 mm Al filtration, and 60-second image acquisition time (15 mA second). Micro-CT imaging acquisitions were repeated four times.
Results
We measured consistently low tumor doses (0.014 to 0.02 Gy; average = 0.017 Gy) per scan. Orthotopic doses in the region of the pancreas were also consistently low (0.014 to 0.018 Gy; average = 0.016 Gy) per scan.
Conclusions
Radiation doses delivered during ultrafast micro-CT serial imaging in the mouse are low and are likely below the threshold to affect tumor growth.
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Acknowledgments
The authors thank Tracy Decklever for her technical and imaging assistance. This work was supported in part by the National Cancer Institute (grant K08 CA103859-01A1 and grant R01 CA100634) and the Mayo Clinic SPORE in Pancreatic Cancer (NIH grant P20 CA10270).
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Carlson, S.K., Classic, K.L., Bender, C.E. et al. Small Animal Absorbed Radiation Dose from Serial Micro-Computed Tomography Imaging. Mol Imaging Biol 9, 78–82 (2007). https://doi.org/10.1007/s11307-007-0080-9
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DOI: https://doi.org/10.1007/s11307-007-0080-9