User manual

ONE SCAN PROTOCOL

This efficient protocol was developed to simplify radiochromic film calibration and to

avoid the complications of the post-exposure growth of radiochromic film response and

the scan-to-scan variability of the scanner. The protocol provides a time-saving method

for evaluating

radiotherapy

treatment plans. The

protocol combines

calibration and

measurement in a

single scan. It was

published in Medical

Physics, 39(10), pp

6339, 2012. Also by

using the One Scan

Protocol,

measurement results

can be obtained in as

little as 10 minutes.

To do this the

application and

reference films should be exposed within a narrow time window. Since the post-

exposure growth in these two films is so very similar when they are exposed minutes

apart it is no longer is in necessary to wait overnight or 24 hours before post exposure

changes have slowed and film can be scanned. If the time between the exposures is Δt

minutes it is only necessary to wait a further 2Δt minutes before scanning to reduce the

dose error to less than 1%. Now results can be obtained on your schedule.

Furthermore, the OneScan Protocol addresses the accuracy and integrity of the

measurement by eliminating variability due to the scanner or environmental factors

affecting the response of the film. The One Scan Protocol requires an unexposed