User manual

123
 Epson
®
Scanner Software
 FilmQA
™
Pro Software
IV. PROCEDURE
Films used in this protocol are of two sorts, strips and sheets. Strips are used for
calibration exposures and about 4 x 20.3 cm. These strips can be cut from sheets of
film taking care to keep track of orientation so all films can be scanned in the same
orientation. Sheets are used for plan exposures and can be 20.3 x 25.4 cm sheets or
smaller sizes large enough to accept the plan exposures. If pieces are cut from
whole sheets keep track of film orientation so all films can be scanned in the same
orientation. The strips, intended for calibration exposures, are referred to as
calibration films. The sheets, intended for exposure of the treatment plan, are
referred to as application films.
The linear accelerator is provided as the source of radiation exposure for the
calibration and application films. For calibration exposure, it is assumed the user
knows the relationship between the number of monitor units delivered by the
accelerator and the dose delivered to the film placed at a known location in the
phantom.
1. Position the phantom on the couch as required for a particular case. The film is to
be located in a known plane at a known distance from the source and
surrounded by a known amount of the phantom material.
2. Place an application film from a known production lot in the phantom with the
center of the film located close to the center of the area to be exposed. Use small
pieces of adhesive tape to hold the film in place. If desired, mark the edges of the
film to show the axes of the accelerator as indicated by the laser markers. Place
phantom material above the film as required.