Evaluation of MVCT images with skin collimation for electron beam treatment planning.

Journal of Applied Clinical Medical Physics
Allen B BeardmoreKenneth R Hogstrom

Abstract

This study assessed the potential of using megavoltage CT (MVCT) images taken with high density skin collimation in place for electron beam treatment planning. MVCT images were taken using the TomoTherapy Hi-Art system (TomoTherapy Inc., Madison, WI), and the CT numbers were converted to density by calibrating the Hi-Art system using an electron density phantom. Doses were computed using MVCT images and kVCT images and compared by calculating dose differences in the uniform dose region ( > 90%, excluding buildup region) and calculating distance-to-agreement (DTA) in high dose-gradient regions (penumbra and distal falloff, 90%-10%). For 9 and 16 MeV electron beams of 10 x 10 cm calculated on a homogeneous CIRS Plastic Water (Computerized Imaging Research Systems Inc., Norfolk, VA) phantom without skin collimation, the maximum dose differences were 2.3% and the maximum DTAs were 2.0 mm for both beams. The same phantom was then MVCT scanned nine times with square skin collimators of Cerrobend on its surface - field sizes of 3 x 3, 6 x 6, and 10 x 10 cm and thicknesses of 6, 8, and 10 mm. Using the Philips Pinnacle 3 treatment planning system (Philips Medical Systems, N.A., Bothwell, WA), a treatment plan was created for combinatio...Continue Reading

References

Apr 1, 1984·International Journal of Radiation Oncology, Biology, Physics·K R HogstromR S Fields
May 1, 1981·Physics in Medicine and Biology·K R HogstromP R Almond
Oct 26, 1999·Physics in Medicine and Biology·K J RuchalaT R Mackie

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Citations

Jan 12, 2020·Environmental Science and Pollution Research International·Shoaib AhmedAbdul Karim Shah

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Software Mentioned

MATLAB
SigmaPlot
Pinnacle
TomoTherapy

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