Realization of fluence field modulated CT on a clinical TomoTherapy megavoltage CT system

Physics in Medicine and Biology
Timothy P SzczykutowiczJennifer Smilowitz

Abstract

The multi-leaf collimator (MLC) assembly present on TomoTherapy (Accuray, Madison WI) radiation therapy (RT) and mega voltage CT machines is well suited to perform fluence field modulated CT (FFMCT). In addition, there is a demand in the RT environment for FFMCT imaging techniques, specifically volume of interest (VOI) imaging. A clinical TomoTherapy machine was programmed to perform VOI. Four different size ROIs were placed at varying distances from isocenter. Projections intersecting the VOI received 'full dose' while those not intersecting the VOI received 30% of the dose (i.e. the incident fluence for non VOI projections was 30% of the incident fluence for projections intersecting the VOI). Additional scans without fluence field modulation were acquired at 'full' and 30% dose. The noise (pixel standard deviation) and mean CT number were measured inside the VOI region and compared between the three scans. Dose maps were generated using a dedicated TomoTherapy treatment planning dose calculator. The VOI-FFMCT technique produced an image noise 1.05, 1.00, 1.03, and 1.05 times higher than the 'full dose' scan for ROI sizes of 10 cm, 13 cm, 10 cm, and 6 cm respectively within the VOI region. The VOI-FFMCT technique required a to...Continue Reading

References

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Mar 8, 2013·Medical Physics·Scott S Hsieh, Norbert J Pelc
Feb 22, 2014·Physics in Medicine and Biology·T P Szczykutowicz, C A Mistretta

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Citations

May 23, 2018·Medical Physics·George DedesGuillaume Landry
May 23, 2018·Journal of Applied Clinical Medical Physics·Thomas C LarsenHan Wen

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