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Dosimetric accuracy at low monitor unit settings

Department of Radiation Oncology, University of Massachusetts Medical Center, Worcester, MA 01655, USA

This excerpt was created in the absence of an abstract.

In his letter, Bomford has pointed out some concerns about our recent paper, Das et al (1991). Let us state that in the paper we do not suggest that typical patient's treatments are likely to be jeopardized because of low monitor unit settings. In fact, we state in the conclusions that "...in terms of total target dose, the error may be insignificant. Only when the treatment is made up of small MU exposures..." is the error possibly of significance. This situation should arise only rarely, but the user should be aware of the potential for error. Increasing the exposure time may be one of the ways to reduce the error, but this requires reducing pulse repetition frequency (PRF) which may not be readily achievable with all medical accelerators.

Received for publication August 15, 1991. Accepted for publication September 4, 1991.