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Patient dose from megavoltage computed tomography imaging.

Amish P Shah¹, Katja M Langen, Kenneth J Ruchala

¹Department of Radiation Oncology, M. D. Anderson Cancer Center Orlando, Orlando, FL 32806, USA. Amish.Shah@orhs.org

International Journal of Radiation Oncology, Biology, Physics

|February 1, 2008

Summary

Megavoltage computed tomography (MVCT) imaging dose was calculated for helical tomotherapy patients. Typical doses were 1.0-2.0 cGy, varying with CT pitch and patient anatomy.

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Area of Science:

Medical Physics
Radiation Oncology
Imaging Technology

Background:

Megavoltage computed tomography (MVCT) is utilized for daily patient alignment in helical tomotherapy.
Accurate dose calculation is crucial for understanding imaging-related radiation exposure.

Purpose of the Study:

To compute and report MVCT imaging doses in phantoms and actual patients undergoing helical tomotherapy.
To validate the accuracy of dose computation methods for MVCT.

Main Methods:

Commissioning and verification of an MVCT beam model using phantom measurements.
Retrospective calculation of patient imaging doses for diverse clinical cases (prostate, breast, head/neck, lung, craniospinal).
Analysis of dose variations based on CT pitch and anatomical thickness.

Main Results:

Computed MVCT doses were within 5% of measured doses in phantom studies.
Imaging dose inversely correlated with CT pitch; typical doses ranged from 1.0-2.0 cGy at normal pitch.
Maximal calculated organ dose was 3.6 cGy in the craniospinal patient neck region at the lowest pitch.

Conclusions:

MVCT dose calculation provides reliable estimates for helical tomotherapy patients, averaging approximately 1.5 cGy per image.
Dose is highest with smallest anatomical thickness and lowest pitch settings.